Java-WebSocket | barebones WebSocket client and server implementation written | Websocket library

by TooTallNate Java Version: v1.5.3 License: MIT

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kandi X-RAY | Java-WebSocket Summary

Java-WebSocket is a Java library typically used in Networking, Websocket applications. Java-WebSocket has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has medium support. You can download it from GitHub, Maven.

[![Maven Central](https://img.shields.io/maven-central/v/org.java-websocket/Java-WebSocket.svg)](https://mvnrepository.com/artifact/org.java-websocket/Java-WebSocket) [![Sonatype Nexus (Snapshots)](https://img.shields.io/nexus/s/https/oss.sonatype.org/org.java-websocket/Java-WebSocket.svg)](https://oss.sonatype.org/content/repositories/snapshots/org/java-websocket/Java-WebSocket/). This repository contains a barebones WebSocket server and client implementation written in 100% Java. The underlying classes are implemented java.nio, which allows for a non-blocking event-driven model (similar to the [WebSocket API](https://html.spec.whatwg.org/multipage/web-sockets.html) for web browsers).

Support

Quality

Security

License

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kandi-support Support

Java-WebSocket has a medium active ecosystem.
It has 8896 star(s) with 2370 fork(s). There are 374 watchers for this library.
There were 1 major release(s) in the last 6 months.
There are 31 open issues and 854 have been closed. On average issues are closed in 16 days. There are 2 open pull requests and 0 closed requests.
It has a neutral sentiment in the developer community.
The latest version of Java-WebSocket is v1.5.3

Java-WebSocket Support

Best in #Websocket

Average in #Websocket

Java-WebSocket Support

Best in #Websocket

Average in #Websocket

quality kandi Quality

Java-WebSocket has 0 bugs and 0 code smells.

Java-WebSocket Quality

Best in #Websocket

Average in #Websocket

Java-WebSocket Quality

Best in #Websocket

Average in #Websocket

security Security

Java-WebSocket has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
Java-WebSocket code analysis shows 0 unresolved vulnerabilities.
There are 0 security hotspots that need review.

Java-WebSocket Security

Best in #Websocket

Average in #Websocket

Java-WebSocket Security

Best in #Websocket

Average in #Websocket

license License

Java-WebSocket is licensed under the MIT License. This license is Permissive.
Permissive licenses have the least restrictions, and you can use them in most projects.

Java-WebSocket License

Best in #Websocket

Average in #Websocket

Java-WebSocket License

Best in #Websocket

Average in #Websocket

build Reuse

Java-WebSocket releases are available to install and integrate.
Deployable package is available in Maven.
Build file is available. You can build the component from source.
Installation instructions are not available. Examples and code snippets are available.
Java-WebSocket saves you 11949 person hours of effort in developing the same functionality from scratch.
It has 26249 lines of code, 1415 functions and 178 files.
It has medium code complexity. Code complexity directly impacts maintainability of the code.

Java-WebSocket Reuse

Best in #Websocket

Average in #Websocket

Java-WebSocket Reuse

Best in #Websocket

Average in #Websocket

Top functions reviewed by kandi - BETA

kandi has reviewed Java-WebSocket and discovered the below as its top functions. This is intended to give you an instant insight into Java-WebSocket implemented functionality, and help decide if they suit your requirements.

Decode the handshake .
Perform the SSL handshake .
Encodes a byte array to a Base64 encoded byte array .
Translate a single frame .
Runs the selector thread .
Called when the user clicks on the chat server .
Reads bytes to dst .
Decompress the frame .
Translate a http header .
Write websocket to socket channel .

Java-WebSocket Key Features

[RFC 6455](http://tools.ietf.org/html/rfc6455)

[RFC 7692](http://tools.ietf.org/html/rfc7692)

Java-WebSocket Examples and Code Snippets

See all related Code Snippets

Dependency management tools

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&lt;dependency&gt;
  &lt;groupId&gt;org.java-websocket&lt;/groupId&gt;
  &lt;artifactId&gt;Java-WebSocket&lt;/artifactId&gt;
  &lt;version&gt;1.5.1&lt;/version&gt;
&lt;/dependency&gt;

Writing your own WebSocket Client

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You can find a lot of examples [here](https://github.com/TooTallNate/Java-WebSocket/tree/master/src/main/example).

WSS Support
---------------------------------
This library supports wss.
To see how to use wss please take a look at the examples.&lt;br&gt;

If you do not have a valid **certificate** in place then you will have to create a self signed one.
Browsers will simply refuse the connection in case of a bad certificate and will not ask the user to accept it.
So the first step will be to make a browser to accept your self signed certificate. ( https://bugzilla.mozilla.org/show_bug.cgi?id=594502 ).&lt;br&gt;
If the websocket server url is `wss://localhost:8000` visit the url `https://localhost:8000` with your browser. The browser will recognize the handshake and allow you to accept the certificate.

The vm option `-Djavax.net.debug=all` can help to find out if there is a problem with the certificate.

It is currently not possible to accept ws and wss connections at the same time via the same websocket server instance.

For some reason Firefox does not allow multiple connections to the same wss server if the server uses a different port than the default port (443).

If you want to use `wss` on the android platform you should take a look at [this](https://github.com/TooTallNate/Java-WebSocket/wiki/FAQ:-Secure-WebSockets#wss-on-android).

I ( @Davidiusdadi ) would be glad if you would give some feedback whether wss is working fine for you or not.

Minimum Required JDK
--------------------

`Java-WebSocket` is known to work with:

 * Java 1.7 and higher

Other JRE implementations may work as well, but haven't been tested.

License
-------

Everything found in this repo is licensed under an MIT license. See
the `LICENSE` file for specifics.

gRPC code not being generated from proto file

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import com.google.protobuf.gradle.*

plugins {
    java
    idea
    application
    id("com.google.protobuf") version "0.8.14"
    id("io.freefair.lombok") version "5.3.0"
}

repositories {
    mavenCentral()
    jcenter()
}


val grpcVersion = "1.34.1"
val protocVersion = "3.12.0"
val slf4jVersion = "1.7.25"

dependencies {
    implementation("io.grpc:grpc-netty:${grpcVersion}")
    implementation("io.grpc:grpc-protobuf:${grpcVersion}")
    implementation("io.grpc:grpc-stub:${grpcVersion}")
    implementation("org.slf4j:slf4j-api:${slf4jVersion}")
    implementation("org.slf4j:slf4j-simple:${slf4jVersion}")

    testImplementation("junit:junit:4.13")
}

// Look here for set path
sourceSets {
    main {
        proto {
            srcDir("src/main/resources/proto")
        }
    }
}

protobuf {
    protoc { artifact = "com.google.protobuf:protoc:${protocVersion}" }
    plugins {
        id("grpc") {
            artifact = "io.grpc:protoc-gen-grpc-java:${grpcVersion}"
        }
    }
    generateProtoTasks {
        ofSourceSet("main").forEach {
            it.plugins {
                id("grpc")
            }
        }
    }
}

Toast Message is not created when message received at Java Websocket server in Android

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new Handler(Looper.getMainLooper()).post(new Runnable() {
    public void run() {
        Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
    }
});

runOnUiThread(new Runnable() {
    @Override
    public void run() {
        Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
    }
});

@Override
public void onMessage(WebSocket conn, String message) {
    System.out.println("Recieved: "+message);

    Intent intent = new Intent("msgReceived");
    intent.putExtra("message", message);
    LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
}

private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String message = intent.getExtras().getString("message");
        Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
    }
};

@Override
protected void onStart() {
    super.onStart();
    LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver, new IntentFilter("msgReceived"));

@Override
protected void onStop() {
    LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver);
    super.onStop();
}

-----------------------

new Handler(Looper.getMainLooper()).post(new Runnable() {
    public void run() {
        Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
    }
});

runOnUiThread(new Runnable() {
    @Override
    public void run() {
        Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
    }
});

@Override
public void onMessage(WebSocket conn, String message) {
    System.out.println("Recieved: "+message);

    Intent intent = new Intent("msgReceived");
    intent.putExtra("message", message);
    LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
}

private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String message = intent.getExtras().getString("message");
        Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
    }
};

@Override
protected void onStart() {
    super.onStart();
    LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver, new IntentFilter("msgReceived"));

@Override
protected void onStop() {
    LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver);
    super.onStop();
}

-----------------------

new Handler(Looper.getMainLooper()).post(new Runnable() {
    public void run() {
        Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
    }
});

runOnUiThread(new Runnable() {
    @Override
    public void run() {
        Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
    }
});

@Override
public void onMessage(WebSocket conn, String message) {
    System.out.println("Recieved: "+message);

    Intent intent = new Intent("msgReceived");
    intent.putExtra("message", message);
    LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
}

private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String message = intent.getExtras().getString("message");
        Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
    }
};

@Override
protected void onStart() {
    super.onStart();
    LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver, new IntentFilter("msgReceived"));

@Override
protected void onStop() {
    LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver);
    super.onStop();
}

-----------------------

new Handler(Looper.getMainLooper()).post(new Runnable() {
    public void run() {
        Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
    }
});

runOnUiThread(new Runnable() {
    @Override
    public void run() {
        Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
    }
});

@Override
public void onMessage(WebSocket conn, String message) {
    System.out.println("Recieved: "+message);

    Intent intent = new Intent("msgReceived");
    intent.putExtra("message", message);
    LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
}

private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String message = intent.getExtras().getString("message");
        Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
    }
};

@Override
protected void onStart() {
    super.onStart();
    LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver, new IntentFilter("msgReceived"));

@Override
protected void onStop() {
    LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver);
    super.onStop();
}

Static interface methods are only supported starting with Android N (--min-api 24): void butterknife.Unbinder.lambda$static$0()

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android {
  ...
  // Butterknife requires Java 8.
  compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
  }
}

dependencies {
  implementation 'com.jakewharton:butterknife:10.2.1'
  annotationProcessor 'com.jakewharton:butterknife-compiler:10.2.1'
}

How to add external jars to Webots?

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; runtime.ini for a Java controller on Windows

[environment variables with paths]
CLASSPATH = ../lib/MyLibrary.jar
JAVA_LIBRARY_PATH = ../lib

[java]
COMMAND = javaw.exe
OPTIONS = -Xms6144k

running a javax.websocket endpoint in spring?

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<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-websocket</artifactId>
</dependency>

@Configuration
@EnableWebSocket
public class WsConfig {

    @Bean
    public ServerEndpointExporter serverEndpoint() {
        return new ServerEndpointExporter();
    }
}

@ServerEndpoint(
        value = "/chat/{username}",
        decoders=MessageDecoder.class,
        encoders = MessageEncoder.class
)
@Component
public class Controller {
 ...

-----------------------

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-websocket</artifactId>
</dependency>

@Configuration
@EnableWebSocket
public class WsConfig {

    @Bean
    public ServerEndpointExporter serverEndpoint() {
        return new ServerEndpointExporter();
    }
}

@ServerEndpoint(
        value = "/chat/{username}",
        decoders=MessageDecoder.class,
        encoders = MessageEncoder.class
)
@Component
public class Controller {
 ...

-----------------------

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-websocket</artifactId>
</dependency>

@Configuration
@EnableWebSocket
public class WsConfig {

    @Bean
    public ServerEndpointExporter serverEndpoint() {
        return new ServerEndpointExporter();
    }
}

@ServerEndpoint(
        value = "/chat/{username}",
        decoders=MessageDecoder.class,
        encoders = MessageEncoder.class
)
@Component
public class Controller {
 ...

Cannot connect to java websocket server

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@Configuration
public class WebSocketConfig {
    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }
}

How to send an image from server to client with Web Socket using Java / Javascript?

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for (String key : sMap.keySet())
{
  Session s = sMap.get(key);

  if (s.isOpen())
  {
    BufferedImage image = image_getter.getAnImage();
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
//  ImageIO.write(image,"jpg",baos);
    ImageIO.write(image,"png",baos);
    byte[] byteArray = baos.toByteArray();
    s.getBasicRemote().sendObject(byteArray);       // Works on both Swing & browser client
  }
  else sMap.remove(key);
}

this.webSocket.onmessage = function (event)
{
  var msg = event.data;
  console.log('onmessage ::  ' + msg);                                   // [object Blob]

  var blobUrl = URL.createObjectURL(new Blob([msg]));
  var image = new Image();
  image.src = blobUrl;
// alert("blobUrl = "+blobUrl);                                           // blob:http://localhost:8080/cc3751d6-5b49-462d-8a6f-f2221c899abf
  image.onload = function() { context.drawImage(image, 0, 0); };
};

@OnWebSocketMessage
public void onMessage(InputStream is)
{
  try
  {
    if (imageLabel!=null)
    {
      BufferedImage img = ImageIO.read(is);
      imageLabel.setIcon(new ImageIcon(img));
    }
  }
  catch (Exception e)
  {
    e.printStackTrace();
  }
}

-----------------------

for (String key : sMap.keySet())
{
  Session s = sMap.get(key);

  if (s.isOpen())
  {
    BufferedImage image = image_getter.getAnImage();
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
//  ImageIO.write(image,"jpg",baos);
    ImageIO.write(image,"png",baos);
    byte[] byteArray = baos.toByteArray();
    s.getBasicRemote().sendObject(byteArray);       // Works on both Swing & browser client
  }
  else sMap.remove(key);
}

this.webSocket.onmessage = function (event)
{
  var msg = event.data;
  console.log('onmessage ::  ' + msg);                                   // [object Blob]

  var blobUrl = URL.createObjectURL(new Blob([msg]));
  var image = new Image();
  image.src = blobUrl;
// alert("blobUrl = "+blobUrl);                                           // blob:http://localhost:8080/cc3751d6-5b49-462d-8a6f-f2221c899abf
  image.onload = function() { context.drawImage(image, 0, 0); };
};

@OnWebSocketMessage
public void onMessage(InputStream is)
{
  try
  {
    if (imageLabel!=null)
    {
      BufferedImage img = ImageIO.read(is);
      imageLabel.setIcon(new ImageIcon(img));
    }
  }
  catch (Exception e)
  {
    e.printStackTrace();
  }
}

-----------------------

for (String key : sMap.keySet())
{
  Session s = sMap.get(key);

  if (s.isOpen())
  {
    BufferedImage image = image_getter.getAnImage();
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
//  ImageIO.write(image,"jpg",baos);
    ImageIO.write(image,"png",baos);
    byte[] byteArray = baos.toByteArray();
    s.getBasicRemote().sendObject(byteArray);       // Works on both Swing & browser client
  }
  else sMap.remove(key);
}

this.webSocket.onmessage = function (event)
{
  var msg = event.data;
  console.log('onmessage ::  ' + msg);                                   // [object Blob]

  var blobUrl = URL.createObjectURL(new Blob([msg]));
  var image = new Image();
  image.src = blobUrl;
// alert("blobUrl = "+blobUrl);                                           // blob:http://localhost:8080/cc3751d6-5b49-462d-8a6f-f2221c899abf
  image.onload = function() { context.drawImage(image, 0, 0); };
};

@OnWebSocketMessage
public void onMessage(InputStream is)
{
  try
  {
    if (imageLabel!=null)
    {
      BufferedImage img = ImageIO.read(is);
      imageLabel.setIcon(new ImageIcon(img));
    }
  }
  catch (Exception e)
  {
    e.printStackTrace();
  }
}

See all related Code Snippets

Community Discussions

Trending Discussions on Java-WebSocket

Notification from Google Play || Malicious Behavior or User Data policy || Intent Redirection
gRPC code not being generated from proto file
Receiving "No appender found" error for log4j2 when adding Pulsar appender
Producer with name is already connected to topic when using Pulsar appender with Ignite logger
Toast Message is not created when message received at Java Websocket server in Android
Static interface methods are only supported starting with Android N (--min-api 24): void butterknife.Unbinder.lambda$static$0()
How to make websocket synchronous
How to add external jars to Webots?
running a javax.websocket endpoint in spring?
Cannot connect to java websocket server

Trending Discussions on Java-WebSocket

QUESTION

Notification from Google Play || Malicious Behavior or User Data policy || Intent Redirection

Asked 2021-Apr-22 at 07:48

As mentioned in image my app is violating there policy but i've another app for the same which is for doctor's and that app is using the same libraries and almost everything similar to this app but still my doctor app is accepted without any violation

androidx.fragment.app.FragmentActivity.startActivityForResult and they are saying your startActivityForResult is responsible for this but i'm only calling this line for opening camera and gallery.

i've tried uploading my app multiple time's with upgraded gradle and there remediations available here https://support.google.com/faqs/answer/9267555 but still no success.

you can also refer below image for further details.

my gradle

buildscript {
    repositories {
        maven { url 'https://plugins.gradle.org/m2/' }
    }
    dependencies {
        classpath 'gradle.plugin.com.onesignal:onesignal-gradle-plugin:0.12.8'
    }
}
apply plugin: 'com.onesignal.androidsdk.onesignal-gradle-plugin'

repositories {
    maven { url 'https://maven.google.com' }
}
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'com.google.firebase.crashlytics'

android {
    compileSdkVersion 29
    defaultConfig {
        applicationId "com.doctoronline.telehealth.patient"
        manifestPlaceholders = [
                onesignal_app_id               : "********-****-****-****-************",
                // Project number pulled from dashboard, local value is ignored.
                onesignal_google_project_number: "REMOTE"
        ]
        minSdkVersion 21
        targetSdkVersion 29
        versionCode 44
        versionName "1.0.24.1"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        vectorDrawables.useSupportLibrary = true
    }
    buildFeatures {
        viewBinding = true
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    lintOptions {
        checkReleaseBuilds false
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8

        kotlinOptions {
            jvmTarget = '1.8'
        }
    }
}

buildscript {
    repositories {
        mavenCentral()
        google()
    }
    dependencies {
        //noinspection GradlePluginVersion
        classpath 'com.android.tools.build:gradle:0.6.+'

    }
}
repositories {
    mavenCentral()

}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    implementation 'com.google.android.material:material:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.3.0'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
    implementation 'de.hdodenhof:circleimageview:3.1.0'
    implementation 'org.java-websocket:Java-WebSocket:1.3.9'
    implementation 'com.android.volley:volley:1.1.1'
    implementation 'com.squareup.picasso:picasso:2.71828'
    implementation 'com.google.firebase:firebase-core:18.0.1'
    implementation 'org.webrtc:google-webrtc:1.0.28513'
    implementation 'com.payumoney.sdkui:plug-n-play:1.6.0'

    implementation 'com.google.firebase:firebase-analytics:18.0.1'
    implementation 'com.google.firebase:firebase-crashlytics:17.3.0'

    implementation 'com.flurry.android:analytics:11.6.0@aar'
    implementation 'com.github.bumptech.glide:glide:4.9.0'
    implementation('com.alimuzaffar.lib:pinentryedittext:1.3.10')
    implementation 'com.hbb20:ccp:2.3.2'
    implementation 'com.google.android.gms:play-services-auth:19.0.0'
    implementation 'com.google.android.gms:play-services-auth-api-phone:17.5.0'
    implementation 'com.koushikdutta.ion:ion:3.0.8'
    implementation 'com.wdullaer:materialdatetimepicker:4.2.3'
    implementation 'io.agora.rtc:full-sdk:3.0.0'
    api 'com.theartofdev.edmodo:android-image-cropper:2.8.0'

    //OneSignal
    implementation 'com.onesignal:OneSignal:3.14.1'

    implementation 'com.toptoche.searchablespinner:searchablespinnerlibrary:1.3.1'
    //Auto-Resizable Pixel
    implementation 'com.intuit.sdp:sdp-android:1.0.6'
    implementation 'com.intuit.ssp:ssp-android:1.0.6'

    //for new version updater
    implementation 'com.google.android.play:core:1.9.1'
}

apply plugin: 'com.google.gms.google-services'

Thanks in advance.

ANSWER

Answered 2021-Mar-23 at 06:26

In my case it was sms broadcast receiver, heres mail received from google after around a month of coordination with google play team they sent mw the details of the violation please take a look at the image attached below.

enter image description here

Source https://stackoverflow.com/questions/65931911

QUESTION

gRPC code not being generated from proto file

Asked 2021-Mar-15 at 11:44

I followed this guide to add gRPC to my Android project, but the proto file does not seem to generate code.

I placed book.proto under app\src\main\java\com\example\android together with my Kotlin code.

That's my project's build.gradle:

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    ext.kotlin_version = "1.3.72"
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:4.1.2"
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"

        // Tar's:
        classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.15' // gRPC

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

That's my module build.gradle:

plugins {
    id 'com.android.application'
    id 'com.google.protobuf' // Tar's: gRPC
    id 'kotlin-android'
}

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.3"

    defaultConfig {
        applicationId "com.example.android"
        minSdkVersion 28
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }

    buildFeatures { // Tar: for using ObservableList, which is part of the Data Binding Library - see https://stackoverflow.com/questions/66352403/observablelist-is-missing-in-android-studio and https://developer.android.com/topic/libraries/data-binding/start
        dataBinding true
    }
}

// Tar's: gRPC {
protobuf {
    protoc { artifact = 'com.google.protobuf:protoc:3.10.0' }
    plugins {
        javalite { artifact = "com.google.protobuf:protoc-gen-javalite:3.0.0" }
        grpc { artifact = 'io.grpc:protoc-gen-grpc-java:1.25.0' // CURRENT_GRPC_VERSION
        }
    }
    generateProtoTasks {
        all().each { task ->
            task.plugins {
                javalite {}
                grpc { // Options added to --grpc_out
                    option 'lite' }
            }
        }
    }
}
// }

dependencies {

    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
    implementation 'androidx.core:core-ktx:1.3.2'
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'com.google.android.material:material:1.2.1'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
    implementation 'androidx.gridlayout:gridlayout:1.0.0'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
    // Tar's:
    implementation "org.java-websocket:Java-WebSocket:1.5.1" // Webscokets
    //implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.1.0" // Tar: for JSON: https://github.com/Kotlin/kotlinx.serialization
    // Tar's - gRPC: {
    implementation 'com.google.protobuf:protobuf-lite:3.0.1'
    implementation 'io.grpc:grpc-okhttp:1.25.0' // CURRENT_GRPC_VERSION
    implementation 'io.grpc:grpc-protobuf-lite:1.25.0' // CURRENT_GRPC_VERSION
    implementation 'io.grpc:grpc-stub:1.25.0' // CURRENT_GRPC_VERSION
    implementation 'javax.annotation:javax.annotation-api:1.3.2'
    // }
}

What could be the problem?

ANSWER

Answered 2021-Mar-15 at 11:44

Looks like the path of proto file is not correcttly. Try to move proto files to src/main/resouces/proto or set path in protobuf plugin configuration.

This is works well with kotlin DSL.

import com.google.protobuf.gradle.*

plugins {
    java
    idea
    application
    id("com.google.protobuf") version "0.8.14"
    id("io.freefair.lombok") version "5.3.0"
}

repositories {
    mavenCentral()
    jcenter()
}


val grpcVersion = "1.34.1"
val protocVersion = "3.12.0"
val slf4jVersion = "1.7.25"

dependencies {
    implementation("io.grpc:grpc-netty:${grpcVersion}")
    implementation("io.grpc:grpc-protobuf:${grpcVersion}")
    implementation("io.grpc:grpc-stub:${grpcVersion}")
    implementation("org.slf4j:slf4j-api:${slf4jVersion}")
    implementation("org.slf4j:slf4j-simple:${slf4jVersion}")

    testImplementation("junit:junit:4.13")
}

// Look here for set path
sourceSets {
    main {
        proto {
            srcDir("src/main/resources/proto")
        }
    }
}

protobuf {
    protoc { artifact = "com.google.protobuf:protoc:${protocVersion}" }
    plugins {
        id("grpc") {
            artifact = "io.grpc:protoc-gen-grpc-java:${grpcVersion}"
        }
    }
    generateProtoTasks {
        ofSourceSet("main").forEach {
            it.plugins {
                id("grpc")
            }
        }
    }
}

Source https://stackoverflow.com/questions/66625775

QUESTION

Receiving "No appender found" error for log4j2 when adding Pulsar appender

Asked 2020-Nov-17 at 00:13

I'm working on a complex application that uses an Ignite version of log4j2. It works perfectly fine, but when I try to add a Pulsar appender it throws an error:

log4j:WARN No appenders could be found for logger (org.apache.pulsar.shade.io.netty.util.internal.logging.InternalLoggerFactory).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

I can't really figure out why it's failing to find the log4j2.xml file because without the Pulsar appender it works fine, so it must be on the classpath. I'm guessing it must be a conflict with the ignite-log4j2 dependency and pulsar-log4j2-appender dependency.

This is what my pom.xml looks like:

   <dependencies>
        <dependency>
            <groupId>org.apache.ignite</groupId>
            <artifactId>ignite-spring</artifactId>
            <version>${ignite.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.ignite</groupId>
            <artifactId>ignite-zookeeper</artifactId>
            <version>${ignite.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.ignite</groupId>
            <artifactId>ignite-urideploy</artifactId>
            <version>${ignite.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.ignite</groupId>
            <artifactId>ignite-log4j2</artifactId>
            <version>${ignite.version}</version>
        </dependency>
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.6</version>
        </dependency>
        <dependency>
            <groupId>org.apache.pulsar</groupId>
            <artifactId>pulsar-client</artifactId>
            <version>${pulsar.version}</version>
        </dependency>
        <dependency>
            <groupId>org.java-websocket</groupId>
            <artifactId>Java-WebSocket</artifactId>
            <version>1.3.8</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
        </dependency>

        <!-- Pulsar logging -->
        <dependency>
            <groupId>org.apache.pulsar</groupId>
            <artifactId>pulsar-log4j2-appender</artifactId>
            <version>2.6.0</version>
            <exclusions>
                <exclusion>
                    <groupId>org.apache.logging.log4j</groupId>
                    <artifactId>log4j-slf4j-impl</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.apache.pulsar</groupId>
                    <artifactId>pulsar-client</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.apache.logging.log4j</groupId>
                    <artifactId>log4j-api</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.apache.logging.log4j</groupId>
                    <artifactId>log4j-core</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

And my log4j2.xml:

<Configuration monitorInterval="60">
    <Appenders>
        <Console name="CONSOLE" target="SYSTEM_OUT">
            <PatternLayout pattern="%d{hh:mm:ss,SSS} [%t] %-5p %c %x - %m%n"/>
            <ThresholdFilter level="ERROR" onMatch="DENY" onMismatch="ACCEPT"/>
        </Console>

        <Console name="CONSOLE_ERR" target="SYSTEM_ERR">
            <PatternLayout pattern="[%d{ISO8601}][%-5p][%t][%c{1}]%notEmpty{[%markerSimpleName]} %m%n"/>
        </Console>

        <Routing name="FILE">
            <Routes pattern="$${sys:nodeId}">
                <Route>
                    <RollingFile name="Rolling-${sys:nodeId}" fileName="ignite/work/log/ignite-${sys:nodeId}.log"
                                 filePattern="ignite/work/log/ignite-${sys:nodeId}-%i-%d{yyyy-MM-dd}.log.gz">
                        <PatternLayout pattern="[%d{ISO8601}][%-5p][%t][%c{1}]%notEmpty{[%markerSimpleName]} %m%n"/>
                        <Policies>
                            <TimeBasedTriggeringPolicy interval="6" modulate="true" />
                            <SizeBasedTriggeringPolicy size="10 MB" />
                        </Policies>
                    </RollingFile>
                </Route>
            </Routes>
        </Routing>
        <Pulsar name="PULSAR" serviceUrl="pulsar://172.21.11.82:6650" topic="json_persistor"  avoidRecursive="false">
            <PatternLayout pattern="%msg%n"/>
        </Pulsar>
    </Appenders>

    <Loggers>
        <Logger name="org.apache.pulsar" level="INFO"/> <!-- to avoid recursive logging -->
        <Logger name="com.coinflex.common.persistor.JsonObjectPersistor" level="INFO" additivity="false">
            <AppenderRef ref="PULSAR"/>
        </Logger>

        <Logger name="org.apache.ignite" level="ERROR"/>
        <Logger name="org.springframework" level="WARN"/>
        <Logger name="org.eclipse.jetty" level="WARN"/>
        <Logger name="org.eclipse.jetty.util.log" level="ERROR"/>
        <Logger name="org.eclipse.jetty.util.component" level="ERROR"/>
        <Logger name="com.amazonaws" level="WARN"/>

        <Root level="INFO">
            <AppenderRef ref="CONSOLE" level="INFO"/>
            <AppenderRef ref="CONSOLE_ERR" level="ERROR"/>
            <AppenderRef ref="FILE" level="DEBUG"/>
        </Root>
    </Loggers>
</Configuration>

ANSWER

Answered 2020-Jul-24 at 14:00

The error message you are getting is coming from Log4J 1. This indicates Log4J 2 isn’t being used, which would explain why it can’t find the pulsar appender.

If you want to use Log4J 2 you need to re-examine your dependencies.

This also indicates it isn’t using your logging configuration.

Source https://stackoverflow.com/questions/63067809

QUESTION

Producer with name is already connected to topic when using Pulsar appender with Ignite logger

Asked 2020-Nov-14 at 11:01

I have a complex project that uses Ignite and has the Ignite version of log4j2 installed.

I'd also like to install a Pulsar appender to log4j2, however, when I start up the application, I get the following error:

log4j:WARN No appenders could be found for logger (org.apache.pulsar.shade.io.netty.util.internal.logging.InternalLoggerFactory).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
2020-07-28 15:58:47,732 main ERROR Failed to start pulsar manager org.apache.pulsar.client.api.PulsarClientException$ProducerBusyException: Producer with name 'pulsar-log4j2-appender-json_persistor4' is already connected to topic
    at org.apache.pulsar.client.api.PulsarClientException.unwrap(PulsarClientException.java:849)
    at org.apache.pulsar.client.impl.ProducerBuilderImpl.create(ProducerBuilderImpl.java:93)
    at org.apache.pulsar.log4j2.appender.PulsarManager.startup(PulsarManager.java:127)
    at org.apache.pulsar.log4j2.appender.PulsarAppender.start(PulsarAppender.java:187)
    at org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:266)
    at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:548)
    at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:620)
    at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:637)
    at org.apache.ignite.logger.log4j2.Log4J2Logger$5.apply(Log4J2Logger.java:405)
    at org.apache.ignite.logger.log4j2.Log4J2Logger$5.apply(Log4J2Logger.java:402)
    at org.apache.ignite.logger.log4j2.Log4J2Logger.addConsoleAppenderIfNeeded(Log4J2Logger.java:302)
    at org.apache.ignite.logger.log4j2.Log4J2Logger.setNodeId(Log4J2Logger.java:402)
    at org.apache.ignite.internal.IgnitionEx$IgniteNamedInstance.initLogger(IgnitionEx.java:2568)
    at org.apache.ignite.internal.IgnitionEx$IgniteNamedInstance.initializeConfiguration(IgnitionEx.java:2206)
    at org.apache.ignite.internal.IgnitionEx$IgniteNamedInstance.start(IgnitionEx.java:1697)
    at org.apache.ignite.internal.IgnitionEx.start0(IgnitionEx.java:1117)
    at org.apache.ignite.internal.IgnitionEx.start(IgnitionEx.java:637)
    at org.apache.ignite.internal.IgnitionEx.start(IgnitionEx.java:563)
    at org.apache.ignite.Ignition.start(Ignition.java:321)
    at com.coinflex.service.release.ReleaseApplication.main(ReleaseApplication.java:39)

Clearly, there is a clash between the two dependencies. I have excluded most when I imported Pulsar appender to my pom.xml however:

 <dependencies>
    <dependency>
        <groupId>org.apache.ignite</groupId>
        <artifactId>ignite-spring</artifactId>
        <version>${ignite.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.ignite</groupId>
        <artifactId>ignite-zookeeper</artifactId>
        <version>${ignite.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.ignite</groupId>
        <artifactId>ignite-urideploy</artifactId>
        <version>${ignite.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.ignite</groupId>
        <artifactId>ignite-log4j2</artifactId>
        <version>${ignite.version}</version>
    </dependency>
    <dependency>
        <groupId>com.google.code.gson</groupId>
        <artifactId>gson</artifactId>
        <version>2.8.6</version>
    </dependency>
    <dependency>
        <groupId>org.apache.pulsar</groupId>
        <artifactId>pulsar-client</artifactId>
        <version>${pulsar.version}</version>
    </dependency>
    <dependency>
        <groupId>org.java-websocket</groupId>
        <artifactId>Java-WebSocket</artifactId>
        <version>1.3.8</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
    </dependency>

    <!-- Pulsar logging -->
    <dependency>
        <groupId>org.apache.pulsar</groupId>
        <artifactId>pulsar-log4j2-appender</artifactId>
        <version>2.6.0</version>
        <exclusions>
            <exclusion>
                <groupId>org.apache.logging.log4j</groupId>
                <artifactId>log4j-slf4j-impl</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.apache.pulsar</groupId>
                <artifactId>pulsar-client</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.apache.logging.log4j</groupId>
                <artifactId>log4j-api</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.apache.logging.log4j</groupId>
                <artifactId>log4j-core</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
</dependencies>

And this is what my log4j2.xml looks like:

<Configuration monitorInterval="60">
    <Appenders>
        <Console name="CONSOLE" target="SYSTEM_OUT">
            <PatternLayout pattern="%d{hh:mm:ss,SSS} [%t] %-5p %c %x - %m%n"/>
            <ThresholdFilter level="ERROR" onMatch="DENY" onMismatch="ACCEPT"/>
        </Console>

        <Console name="CONSOLE_ERR" target="SYSTEM_ERR">
            <PatternLayout pattern="[%d{ISO8601}][%-5p][%t][%c{1}]%notEmpty{[%markerSimpleName]} %m%n"/>
        </Console>

        <Routing name="FILE">
            <Routes pattern="$${sys:nodeId}">
                <Route>
                    <RollingFile name="Rolling-${sys:nodeId}" fileName="ignite/work/log/ignite-${sys:nodeId}.log"
                                 filePattern="ignite/work/log/ignite-${sys:nodeId}-%i-%d{yyyy-MM-dd}.log.gz">
                        <PatternLayout pattern="[%d{ISO8601}][%-5p][%t][%c{1}]%notEmpty{[%markerSimpleName]} %m%n"/>
                        <Policies>
                            <TimeBasedTriggeringPolicy interval="6" modulate="true" />
                            <SizeBasedTriggeringPolicy size="10 MB" />
                        </Policies>
                    </RollingFile>
                </Route>
            </Routes>
        </Routing>
        <Pulsar name="PULSAR" serviceUrl="pulsar://172.21.11.82:6650" topic="json_persistor"  avoidRecursive="false">
            <PatternLayout pattern="%msg%n"/>
        </Pulsar>
    </Appenders>

    <Loggers>
     
        <Logger name="org.apache.ignite" level="ERROR"/>
        <Logger name="org.springframework" level="WARN"/>
        <Logger name="org.eclipse.jetty" level="WARN"/>
        <Logger name="org.eclipse.jetty.util.log" level="ERROR"/>
        <Logger name="org.eclipse.jetty.util.component" level="ERROR"/>
        <Logger name="com.amazonaws" level="WARN"/>

        <Root level="INFO">
            <AppenderRef ref="CONSOLE" level="INFO"/>
            <AppenderRef ref="CONSOLE_ERR" level="ERROR"/>
            <AppenderRef ref="FILE" level="DEBUG"/>
        </Root>
    </Loggers>
</Configuration>

ANSWER

Answered 2020-Aug-11 at 04:09

The issue isn't with the log4j dependencies, but rather with a name conflict with the producer that is trying to connect to the Pulsar topic. The stack trace says "Producer with name 'pulsar-log4j2-appender-json_persistor4' is already connected to topic", which I assume is the name your application uses for one of the producers.

Therefore, you simply need to stop the previously running instance of the application in order to terminate the existing producer so that the new one can connect.

An long-term solution is to avoid explicitly naming your producers and allow Pulsar to handle that for you. Then the names are guaranteed to be unique. See Is it possible to have multiple producers for the same topic on Pulsar? for more details

Source https://stackoverflow.com/questions/63129768

QUESTION

Toast Message is not created when message received at Java Websocket server in Android

Asked 2020-Sep-20 at 03:36

I am trying to create basic WebSocket server with this library. I want to make a toast message when a message is received. In onMessage() function below I have implemented that. But no toast message is happening.

But Received message is printed on console.

        WebSocketServer ws = new WebSocketServer(new InetSocketAddress(3000)) {

        @Override
        public void onOpen(WebSocket conn, ClientHandshake handshake) {
            conn.send("Hello world");
        }

        @Override
        public void onClose(WebSocket conn, int code, String reason, boolean remote) {

        }

        @Override
        public void onMessage(WebSocket conn, String message) {
            System.out.println("Recieved: "+message);
            Toast.makeText(MainActivity.this, "Recieved: " + message, Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onError(WebSocket conn, Exception ex) {

        }

        @Override
        public void onStart() {

        }
    };
    ws.start();
}

ANSWER

Answered 2020-Sep-20 at 03:36

I think you have to switch to the UI thread to show the Toast.

You can try using a Handler:

new Handler(Looper.getMainLooper()).post(new Runnable() {
    public void run() {
        Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
    }
});

Or calling runOnUiThread:

runOnUiThread(new Runnable() {
    @Override
    public void run() {
        Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
    }
});

Or broadcasting the message:

@Override
public void onMessage(WebSocket conn, String message) {
    System.out.println("Recieved: "+message);

    Intent intent = new Intent("msgReceived");
    intent.putExtra("message", message);
    LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
}

And registering a BroadcastReceiver in your Activity:

private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String message = intent.getExtras().getString("message");
        Toast.makeText(MainActivity.this, "Received: " + message, Toast.LENGTH_SHORT).show();
    }
};

@Override
protected void onStart() {
    super.onStart();
    LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver, new IntentFilter("msgReceived"));

@Override
protected void onStop() {
    LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver);
    super.onStop();
}

Source https://stackoverflow.com/questions/63973393

QUESTION

Static interface methods are only supported starting with Android N (--min-api 24): void butterknife.Unbinder.lambda$static$0()

Asked 2020-Jun-14 at 10:59

I was trying to debug an app when I encountered this error

Static interface methods are only supported starting with Android N (--min-api 24): void butterknife.Unbinder.lambda$static$0()

Here is my gradle

apply plugin: 'com.android.application'

    android {
        compileSdkVersion 29
        buildToolsVersion "29.0.3"

    defaultConfig {
        applicationId "com.github.webrtc"
        minSdkVersion 19
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
        }
    }




    dependencies {
        implementation fileTree(dir: 'libs', include: ['*.jar'])
        androidTestCompile('androidx.test.espresso:espresso-core:3.1.0', {
            exclude group: 'com.android.support', module: 'support-annotations'
        })
        implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
        implementation 'fi.vtt.nubomedia:kurento-room-client-android:1.1.2' 
        implementation 'org.whispersystems:webrtc-android:M59'
        implementation 'com.jakewharton:butterknife:10.0.0'
        annotationProcessor 'com.jakewharton:butterknife-compiler:10.0.0'
        implementation "org.java-websocket:Java-WebSocket:1.3.0"
        implementation 'com.squareup.okhttp3:okhttp:3.9.0'
        implementation 'androidx.appcompat:appcompat:1.1.0'
        testImplementation 'junit:junit:4.12'
        androidTestImplementation 'androidx.test.ext:junit:1.1.1'
        androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
    }

ANSWER

Answered 2020-Jun-14 at 10:59

Read the "Download" section of Butterknife's github page.
https://github.com/JakeWharton/butterknife

android {
  ...
  // Butterknife requires Java 8.
  compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
  }
}

dependencies {
  implementation 'com.jakewharton:butterknife:10.2.1'
  annotationProcessor 'com.jakewharton:butterknife-compiler:10.2.1'
}

You need to add the compileOptions part.

Source https://stackoverflow.com/questions/62371518

QUESTION

How to make websocket synchronous

Asked 2020-Jun-09 at 07:28

I have implemented a websocket client program using tyrus referring this example. There it was implemented in a assynchronous way. Now I want make it synchronous so that once I send a request, program will wait till the response received. Is it possible with tyrus framework? If so, how cam I do it? Below is my implementation of client program

@ClientEndpoint
public class WebSocketConnection extends Thread{

    private static final Logger logger = LogManager.getLogger("WebSocketConnection");
    private static CountDownLatch countDownLatch;
    private boolean isClientAuthenticated = false;
    private boolean isConnected = false;
    private Session serverSession = null;

    private boolean isTimerEnable = false;
    private int i_TimeOut = 0;
    private ArrayList<String> list_RTRequests;

    private static final String PULSE = "Pulse message";
    private static final String AUTH_REQ = "Authentication"; //I can't provide real values of these 2 variables. Hope it will not be a problem

    public WebSocketConnection(boolean _isTimerEnable, int _iTimeOut, ArrayList<String> _listRTRequests) {
        this.isTimerEnable = _isTimerEnable;
        this.i_TimeOut = _iTimeOut;
        this.list_RTRequests = _listRTRequests;
    }

    @Override
    public void run() {
        while (true) {

            if (isConnected) {

                if (isClientAuthenticated) {
                    sendPulseToClient();
                    sendRTs();
                }

            } else {
                countDownLatch = new CountDownLatch(1);
                ClientManager clientManager = ClientManager.createClient();

                try {
                    clientManager.connectToServer(WebSocketConnection.class, new URI("uri"));
                    countDownLatch.await();
                } catch (InterruptedException | URISyntaxException | DeploymentException e) {
                    e.printStackTrace();
                }
            }

            try {
                sleep(30000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    @OnOpen
    public void onOpen(Session session){
        System.out.println("Connected... " + session.getId());
        isConnected = true;
        try {
            logger.info("AUTH_REQ Sent : "+ AUTH_REQ);
            session.getBasicRemote().sendText(AUTH_REQ);
            serverSession = session;
        } catch (IOException e) {
            logger.error("Authentication Error : " + e);
        }
    }

    @OnMessage
    public String onMessage(String _sMessage, Session session){
        //System.out.println("Response : " +_sMessage);
        logger.info("Response : " +_sMessage);

        return _sMessage;
    }

    @OnClose
    public void onClose(Session session, CloseReason closeReason) {
        System.out.println("Session " +session.getId()+" close because of "+ closeReason);
        countDownLatch.countDown();
        isConnected = false;
        logger.info(String.format("Session %s close because of %s", session.getId(), closeReason));
    }

    private void sendPulseToClient() {
        try {
            serverSession.getBasicRemote().sendText(PULSE);
            System.out.println("send pulse : " + PULSE);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void sendRTs(){
        try {
            if(! list_RTRequests.isEmpty()){
                for(String rt : list_RTRequests){
                    if (isTimerEnable){
                        serverSession.getBasicRemote().sendText(rt);
                        sleep(i_TimeOut);
                    } else {
                        serverSession.getBasicRemote().sendText(rt);
                        countDownLatch.await();
                    }
                }
            }
        } catch (IOException | InterruptedException e) {
            logger.error("Error sending request : " + e);
        }
    }
}

ANSWER

Answered 2020-Jun-09 at 07:28

There is no such thing as "synchronous websocket" as it's a whole different messaging protocol than HTTP. While HTTP is a request-response protocol, where you expect a response from the client once you sent the request, WebSocket establishes a connection using a handshake request, after which the communication becomes bidirectional where there is no concept of response to a request. You can read more about it in Wikipedia.

Source https://stackoverflow.com/questions/62275977

QUESTION

How to add external jars to Webots?

Asked 2020-May-27 at 08:20

I'm trying to add external jar to a Webots project. In IntelliJ i can just do project structure -> modules -> dependencies -> add, to add the external jar. How to do this in Webots? I've tried to change the classpath, but no success..

I get this error: socket.java:1: error: package org.java_websocket.client does not exist, eventhough i have the jars on my computer.

Edit in response to Olivier:

[environment variables with paths]
CLASSPATH = ../jars/Java-WebSocket-1.3.8.jar
JAVA_LIBRARY_PATH = ../jars

[java]
COMMAND = javaw.exe
OPTIONS = -Xms6144k

I've added the code above, but this didn't work.

Also, i could provide StackOverflow with my code. Here it is:

import org.java_websocket.client.WebSocketClient;
import org.java_websocket.drafts.Draft_6455;
import org.java_websocket.handshake.ServerHandshake;
import org.json.JSONObject;

import java.net.URI;
import java.net.URISyntaxException;

public class socket {

  public static void main(String args[]) throws URISyntaxException, InterruptedException {


    WebSocketClient mWs = new WebSocketClient(new URI("ws://localhost:8000"), new Draft_6455()) {
      @Override
      public void onMessage(String message) {
        JSONObject obj = new JSONObject(message);
        String channel = obj.getString("channel");
      }

      @Override
      public void onOpen(ServerHandshake handshake) {
        System.out.println("opened connection");
        this.send("Connection opened");

      }

      @Override
      public void onClose(int code, String reason, boolean remote) {
        System.out.println("closed connection");
      }

      @Override
      public void onError(Exception ex) {
        ex.printStackTrace();
      }

    };

    //open websocket
    mWs.connectBlocking();
    JSONObject obj = new JSONObject();
    obj.put("event", "addChannel");
    obj.put("channel", "ok_btccny_ticker");
    String message = obj.toString();
    //send message
//    mWs.send(message);
  }
}

And the errors:

    javac -Xlint -classpath "C:\Users\user\AppData\Local\Programs\Webots\lib\controller\java\Controller.jar;;." socket.java
socket.java:1: error: package org.java_websocket.client does not exist
import org.java_websocket.client.WebSocketClient;
                                ^
socket.java:2: error: package org.java_websocket.drafts does not exist
import org.java_websocket.drafts.Draft_6455;
                                ^
socket.java:3: error: package org.java_websocket.handshake does not exist
import org.java_websocket.handshake.ServerHandshake;
                                   ^
socket.java:4: error: package org.json does not exist
import org.json.JSONObject;
               ^
socket.java:14: error: cannot find symbol
    WebSocketClient mWs = new WebSocketClient(new URI("ws://localhost:8000"), new Draft_6455()) {
    ^
  symbol:   class WebSocketClient
  location: class socket
socket.java:14: error: cannot find symbol
    WebSocketClient mWs = new WebSocketClient(new URI("ws://localhost:8000"), new Draft_6455()) {
                              ^
  symbol:   class WebSocketClient
  location: class socket
socket.java:14: error: cannot find symbol
    WebSocketClient mWs = new WebSocketClient(new URI("ws://localhost:8000"), new Draft_6455()) {
                                                                                  ^
  symbol:   class Draft_6455
  location: class socket
socket.java:22: error: cannot find symbol
      public void onOpen(ServerHandshake handshake) {
                         ^
  symbol: class ServerHandshake
socket.java:15: error: method does not override or implement a method from a supertype
      @Override
      ^
socket.java:17: error: cannot find symbol
        JSONObject obj = new JSONObject(message);
        ^
  symbol: class JSONObject
socket.java:17: error: cannot find symbol
        JSONObject obj = new JSONObject(message);
                             ^
  symbol: class JSONObject
socket.java:21: error: method does not override or implement a method from a supertype
      @Override
      ^
socket.java:24: error: cannot find symbol
        this.send("Connection opened");
            ^
  symbol: method send(String)
socket.java:28: error: method does not override or implement a method from a supertype
      @Override
      ^
socket.java:33: error: method does not override or implement a method from a supertype
      @Override
      ^
15 errors
printing javac parameters to: C:\Users\user\Documents\my_project3\controllers\socket\javac.20200527_102128.args
Nothing to be done for build targets.

As you can see, i get override errors because Webots can't find the jar that holds the methods/functions.

ANSWER

Answered 2020-May-26 at 15:34

You should define the CLASSPATH variable in the runtime.ini file of your robot controller as explained here:

; runtime.ini for a Java controller on Windows

[environment variables with paths]
CLASSPATH = ../lib/MyLibrary.jar
JAVA_LIBRARY_PATH = ../lib

[java]
COMMAND = javaw.exe
OPTIONS = -Xms6144k

Source https://stackoverflow.com/questions/62022335

QUESTION

running a javax.websocket endpoint in spring?

Asked 2020-May-05 at 16:07

I have implemented a websocket server by following this tutorial: https://www.baeldung.com/java-websockets

Now how do I run this app? I am using Spring and my main function looks like this:

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class App {
    public static void main(String[] args) {
        SpringApplication.run(App.class, args);
    }
}

and my websocket endpoint looks like this:

import java.io.IOException;

import javax.websocket.*;
import javax.websocket.server.*;

@ServerEndpoint(
        value = "/chat/{username}",
        decoders=MessageDecoder.class,
        encoders = MessageEncoder.class
)
public class Controller {
    // ...
}

now when I run this, and try to connect to the websocket endpoint like this: wsta ws://localhost:8080/chat/aa -I I get the following error:

WebSocket upgrade request

---

Host: localhost:8080

Connection: Upgrade

Upgrade: websocket

Sec-WebSocket-Version: 13

Sec-WebSocket-Key: ...

Origin: http://localhost

WebSocket upgrade response

---

404 Not Found

Vary: OriginAccess-Control-Request-MethodAccess-Control-Request-Headers

Content-Type: application/json

Transfer-Encoding: chunked

Date: Tue, 05 May 2020 12:12:52 GMT

WebSocketError: WebSocket response error

The answer here (https://stackoverflow.com/a/57924245/10551293) says that you access the webscoket endpoint over ws://localhost:8080/context/chat/aa. What is context, and how do I get my server to run and accept incoming connections?

ANSWER

Answered 2020-May-05 at 16:07

In order to get the Baeldung tutorial mentioned in OP running

I had to add a maven dependency for spring-boot-starter-websocket to pom.xml

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-websocket</artifactId>
</dependency>

Add a spring @Configuration in which @EnableWebSocket is added and a ServerEndpointExporter bean is instantiated:

@Configuration
@EnableWebSocket
public class WsConfig {

    @Bean
    public ServerEndpointExporter serverEndpoint() {
        return new ServerEndpointExporter();
    }
}

Additionally the endpoint controller has to be a spring @Component:

@ServerEndpoint(
        value = "/chat/{username}",
        decoders=MessageDecoder.class,
        encoders = MessageEncoder.class
)
@Component
public class Controller {
 ...

Eventually the websocket endpoint was reachable under ws://localhost:8080/chat/torvalds

Source https://stackoverflow.com/questions/61613065

QUESTION

Cannot connect to java websocket server

Asked 2020-Mar-23 at 22:27

I am trying to create a simple websocket java chat. But I am having an incredible struggle trying to figure out what is the problem here and why I receive "Firefox can’t establish a connection to the server at ws://localhost:8080/ivan-stanev-client/chat/a". I have a simple web socket java server:

@ServerEndpoint(value = "/chat/{username}", decoders = MessageDecoder.class, encoders = MessageEncoder.class)
public class ChatEndpoint {
    private Session session;
    private static final Set<ChatEndpoint> chatEndpoints = new CopyOnWriteArraySet<>();
    private static HashMap<String, String> users = new HashMap<>();

    @OnOpen
    public void onOpen(Session session, @PathParam("username") String username) throws IOException, EncodeException {

        this.session = session;
        chatEndpoints.add(this);
        users.put(session.getId(), username);

        Message message = new Message();
        message.setFrom(username);
        message.setContent("Connected!");
        broadcast(message);
    }
...

And this is the part that creates the error in the javascript(no idea why I cannot establish a connection, I searched everywhere):

    ws = new WebSocket("ws://" + document.location.host + "/ivan-stanev-client/chat/" + username);

P.S. I am following this tutorial: https://github.com/eugenp/tutorials/tree/c83c449fa5a7ac2462fabf0ed26969f1b037aa12/java-websocket

ANSWER

Answered 2020-Mar-23 at 22:27

What was the issue? Tomcat uses ServletContainerInitializer to find any classes annotated with ServerEndpoint in an application. Spring Boot, on the other hand, doesn’t support ServletContainerInitializer when you’re using any embedded web container.

Therefore, we need to export our ServerEndpoint by creating a bean of ServerEndpointExporter. WebSocketConfig class had to be created in the application.

@Configuration
public class WebSocketConfig {
    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }
}

Also I was missing a @Component annotation on the WebSocket Server.

-- Credits http://thegeekyasian.com/websocket-in-spring-boot/

Source https://stackoverflow.com/questions/60817119

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install Java-WebSocket

You can download it from GitHub, Maven.
You can use Java-WebSocket like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the Java-WebSocket component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .