netty | netty 多client 单server | Websocket library

 by   yuanxiaolong Java Version: Current License: No License

kandi X-RAY | netty Summary

kandi X-RAY | netty Summary

netty is a Java library typically used in Networking, Websocket applications. netty has high support. However netty has 3 bugs, it has 11 vulnerabilities and it build file is not available. You can download it from GitHub.


            kandi-support Support

              netty has a highly active ecosystem.
              It has 28 star(s) with 31 fork(s). There are 5 watchers for this library.
              It had no major release in the last 6 months.
              netty has no issues reported. There are no pull requests.
              It has a positive sentiment in the developer community.
              The latest version of netty is current.

            kandi-Quality Quality

              netty has 3 bugs (1 blocker, 0 critical, 2 major, 0 minor) and 25 code smells.

            kandi-Security Security

              netty has 11 vulnerability issues reported (2 critical, 5 high, 4 medium, 0 low).
              netty code analysis shows 0 unresolved vulnerabilities.
              There are 2 security hotspots that need review.

            kandi-License License

              netty does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              netty releases are not available. You will need to build from source code and install.
              netty has no build file. You will be need to create the build yourself to build the component from source.
              netty saves you 120 person hours of effort in developing the same functionality from scratch.
              It has 302 lines of code, 19 functions and 9 files.
              It has low code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed netty and discovered the below as its top functions. This is intended to give you an instant insight into netty implemented functionality, and help decide if they suit your requirements.
            • Start a client thread
            • Send message by short TCP
            • Send msg by long TCP
            • Start message
            • Gets the name
            • Start server
            • Pull message from server
            • Send message to channel
            • Receive message from server
            • Main entry point
            • Called when a channel is closed
            • From interface ClientHandler
            • Shutdown channel
            • Called when an exception occurs
            • Run the connector
            • Binds the bootstrap
            Get all kandi verified functions for this library.

            netty Key Features

            No Key Features are available at this moment for netty.

            netty Examples and Code Snippets

            No Code Snippets are available at this moment for netty.

            Community Discussions


            Java, Intellij IDEA problem Unrecognized option: --add-opens=jdk.compiler/
            Asked 2022-Mar-26 at 15:23

            I have newly installed



            Answered 2021-Jul-28 at 07:22

            You are running the project via Java 1.8 and add the --add-opens option to the runner. However Java 1.8 does not support it.

            So, the first option is to use Java 11 to run the project, as Java 11 can recognize this VM option.

            Another solution is to find a place where --add-opens is added and remove it. Check Run configuration in IntelliJ IDEA (VM options field) and Maven/Gradle configuration files for argLine (Maven) and jvmArgs (Gradle)



            Springboot 2.6.0 / Spring fox 3 - Failed to start bean 'documentationPluginsBootstrapper'
            Asked 2022-Mar-25 at 06:14

            I'm trying to initiate a Springboot project using Open Jdk 15, Springboot 2.6.0, Springfox 3. We are working on a project that replaced Netty as the webserver and used Jetty instead because we do not need a non-blocking environment.

            In the code we depend primarily on Reactor API (Flux, Mono), so we can not remove org.springframework.boot:spring-boot-starter-webflux dependencies.

            I replicated the problem that we have in a new project.:

            I figured out that these lines in our build.gradle file are the origin of the problem.



            Answered 2022-Feb-08 at 12:36

            This problem's caused by a bug in Springfox. It's making an assumption about how Spring MVC is set up that doesn't always hold true. Specifically, it's assuming that MVC's path matching will use the Ant-based path matcher and not the PathPattern-based matcher. PathPattern-based matching has been an option for some time now and is the default as of Spring Boot 2.6.

            As described in Spring Boot 2.6's release notes, you can restore the configuration that Springfox assumes will be used by setting spring.mvc.pathmatch.matching-strategy to ant-path-matcher in your file. Note that this will only work if you are not using Spring Boot's Actuator. The Actuator always uses PathPattern-based parsing, irrespective of the configured matching-strategy. A change to Springfox will be required if you want to use it with the Actuator in Spring Boot 2.6 and later.



            spark-shell exception org.apache.spark.SparkException: Exception thrown in awaitResult
            Asked 2022-Mar-23 at 09:29

            Facing below error while starting spark-shell with yarn master. Shell is working with spark local master.



            Answered 2022-Mar-23 at 09:29

            Adding these properties in fixed the issue for me.



            How to run spark 3.2.0 on google dataproc?
            Asked 2022-Mar-10 at 11:46

            Currently, google dataproc does not have spark 3.2.0 as an image. The latest available is 3.1.2. I want to use the pandas on pyspark functionality that spark has released with 3.2.0.

            I am doing the following steps to use spark 3.2.0

            1. Created an environment 'pyspark' locally with pyspark 3.2.0 in it
            2. Exported the environment yaml with conda env export > environment.yaml
            3. Created a dataproc cluster with this environment.yaml. The cluster gets created correctly and the environment is available on master and all the workers
            4. I then change environment variables. export SPARK_HOME=/opt/conda/miniconda3/envs/pyspark/lib/python3.9/site-packages/pyspark (to point to pyspark 3.2.0), export SPARK_CONF_DIR=/usr/lib/spark/conf (to use dataproc's config file) and, export PYSPARK_PYTHON=/opt/conda/miniconda3/envs/pyspark/bin/python (to make the environment packages available)

            Now if I try to run the pyspark shell I get:



            Answered 2022-Jan-15 at 07:17

            One can achieve this by:

            1. Create a dataproc cluster with an environment (your_sample_env) that contains pyspark 3.2 as a package
            2. Modify /usr/lib/spark/conf/ by adding



            Simulate throwing an exception that is package protected
            Asked 2022-Mar-09 at 10:44

            Problem: for one of my unit-tests, I want to simulate throwing an exception (io.netty.handler.timeout.TimeoutException) in combination with Mockito. However, Java won't allow this because the exception is package-protected.

            Right now I have the following bit of code:



            Answered 2022-Mar-09 at 10:44

            The class io.netty.handler.timeout.TimeoutException itself is public, but its constructors are package-private. You can mock the exception:



            Spring Boot WebClient stops sending requests
            Asked 2022-Feb-18 at 14:42

            I am running a Spring Boot app that uses WebClient for both non-blocking and blocking HTTP requests. After the app has run for some time, all outgoing HTTP requests seem to get stuck.

            WebClient is used to send requests to multiple hosts, but as an example, here is how it is initialized and used to send requests to Telegram:




            Answered 2021-Dec-20 at 14:25

            I would propose to take a look in the RateLimiter direction. Maybe it does not work as expected, depending on the number of requests your application does over time. From the Javadoc for Ratelimiter: "It is important to note that the number of permits requested never affects the throttling of the request itself ... but it affects the throttling of the next request. I.e., if an expensive task arrives at an idle RateLimiter, it will be granted immediately, but it is the next request that will experience extra throttling, thus paying for the cost of the expensive task." Also helpful might be this discussion: github or github

            I could imaginge there is some throttling adding up or other effect in the RateLimiter, i would try to play around with it and make sure this thing really works the way you want. Alternatively, consider using Spring @Scheduled to read from your queue. You might want to spice it up using embedded JMS for further goodies (message persistence etc).



            Could not resolve - Gradle project sync failed. Basic functionality will not work properly - in kotlin project
            Asked 2022-Feb-14 at 19:47

            It was a project that used to work well in the past, but after updating, the following errors appear.



            Answered 2021-Sep-17 at 11:03

            Add mavenCentral() in Build Script



            Ktor needs 1 hour(forever) to boot up
            Asked 2022-Jan-28 at 16:23

            I have a ktor app. I works fine when I run it in development mode. I package it in a docker image by copying over what the gradle application plugin provided. That also works fine on my local machine 8 cores. But now the strange part. When I do exactly the same thing on a rented V-Server also running Ubuntu-20.04 like my local system, ktor is incredible slow.



            Answered 2021-Aug-31 at 20:52

            docker-compose being slow and my program not starting seemed to be due to insufficient(not good enough) input to /dev/urandom. Installing resolved the problem.



            PortUnreachableExceptions spamming log after updating Spring Boot Parent
            Asked 2022-Jan-13 at 17:47

            After upgrading from spring-boot-parent version 2.5.5 to 2.6.0, I started seeing these error messages spamming the logs:

            [INFO] [stdout] 2022-01-11 13:40:01.157 WARN 76859 --- [ udp-epoll-2] : [6d1243de, L:/ - R:localhost/] An exception has been observed post termination, use DEBUG level to see the full stack: readAddress(..) failed: Connection refused

            Using DEBUG level:



            Answered 2022-Jan-13 at 17:47

            assuming statsd is not used and configured on your side, since it's pointed to localhost, you may disable it by setting



            How to run Spark SQL Thrift Server in local mode and connect to Delta using JDBC
            Asked 2022-Jan-08 at 06:42

            I'd like connect to Delta using JDBC and would like to run the Spark Thrift Server (STS) in local mode to kick the tyres.

            I start STS using the following command:



            Answered 2022-Jan-08 at 06:42

            Once you can copy JAR file to $SPARK_HOME/lib and restart, this error goes away.


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


            Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. In Netty before version 4.1.59.Final there is a vulnerability on Unix-like systems involving an insecure temp file. When netty's multipart decoders are used local information disclosure can occur via the local system temporary directory if temporary storing uploads on the disk is enabled. On unix-like systems, the temporary directory is shared between all user. As such, writing to this directory using APIs that do not explicitly set the file/directory permissions can lead to information disclosure. Of note, this does not impact modern MacOS Operating Systems. The method "File.createTempFile" on unix-like systems creates a random file, but, by default will create this file with the permissions "-rw-r--r--". Thus, if sensitive information is written to this file, other local users can read this information. This is the case in netty's "AbstractDiskHttpData" is vulnerable. This has been fixed in version 4.1.59.Final. As a workaround, one may specify your own "" when you start the JVM or use "DefaultHttpDataFactory.setBaseDir(...)" to set the directory to something that is only readable by the current user.
            The ZlibDecoders in Netty 4.1.x before 4.1.46 allow for unbounded memory allocation while decoding a ZlibEncoded byte stream. An attacker could send a large ZlibEncoded byte stream to the Netty server, forcing the server to allocate all of its free memory to a single decoder.
   in Netty before 4.1.44 allows a Content-Length header to be accompanied by a second Content-Length header, or by a Transfer-Encoding header.
   in Netty before 4.1.44 allows an HTTP header that lacks a colon, which might be interpreted as a separate header with an incorrect syntax, or might be interpreted as an "invalid fold."
            Netty before 4.1.42.Final mishandles whitespace before the colon in HTTP headers (such as a "Transfer-Encoding : chunked" line), which leads to HTTP request smuggling.

            Install netty

            You can download it from GitHub.
            You can use netty 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 netty 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 For Gradle installation, please refer .


            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 .
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