mapdb | MapDB provides concurrent Maps, Sets and Queues backed | Database library

by jankotek Java Version: Current License: Apache-2.0

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kandi X-RAY | mapdb Summary

mapdb is a Java library typically used in Database applications. mapdb has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has high support. You can download it from GitHub, Maven.

[![Build Status](https://travis-ci.org/jankotek/mapdb.svg?branch=master)](https://travis-ci.org/jankotek/mapdb) [![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.mapdb/mapdb/badge.svg)](https://search.maven.org/#search%7Cga%7C1%7Cg%3A%22org.mapdb%22%20AND%20a%3Amapdb) [![Join the chat at https://gitter.im/jankotek/mapdb](https://badges.gitter.im/jankotek/mapdb.svg)](https://gitter.im/jankotek/mapdb?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge).

Support

Quality

Security

License

Reuse

kandi-support Support

mapdb has a highly active ecosystem.
It has 4372 star(s) with 837 fork(s). There are 328 watchers for this library.
It had no major release in the last 12 months.
There are 146 open issues and 731 have been closed. On average issues are closed in 114 days. There are 6 open pull requests and 0 closed requests.
It has a negative sentiment in the developer community.
The latest version of mapdb is current.

mapdb Support

Best in #Database

Average in #Database

mapdb Support

Best in #Database

Average in #Database

quality kandi Quality

mapdb has 0 bugs and 0 code smells.

mapdb Quality

Best in #Database

Average in #Database

mapdb Quality

Best in #Database

Average in #Database

security Security

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

mapdb Security

Best in #Database

Average in #Database

mapdb Security

Best in #Database

Average in #Database

license License

mapdb is licensed under the Apache-2.0 License. This license is Permissive.
Permissive licenses have the least restrictions, and you can use them in most projects.

mapdb License

Best in #Database

Average in #Database

mapdb License

Best in #Database

Average in #Database

build Reuse

mapdb releases are not available. You will need to build from source code and install.
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.
mapdb saves you 9938 person hours of effort in developing the same functionality from scratch.
It has 20243 lines of code, 2041 functions and 135 files.
It has medium code complexity. Code complexity directly impacts maintainability of the code.

mapdb Reuse

Best in #Database

Average in #Database

mapdb Reuse

Best in #Database

Average in #Database

Top functions reviewed by kandi - BETA

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

Compacts the index file .
Reload the file .
Removes the element with the given key .
Create a factory to create a single index volume .
Search for a value in the sorted array and return the index .
Returns a string representation of this map .
Pack an integer value .
Serialize a sequence of bytes .
Searches for a key in a sorted order .
Returns the next 32 bit value .

mapdb Key Features

Drop-in replacement for Maps, Lists, Queues and other collections.

Off-heap collections not affected by Garbage Collector

Multilevel cache with expiration and disk overflow.

RDBMs replacement with transactions, MVCC, incremental backups etc…

Local data processing and filtering. MapDB has utilities to process huge quantities of data in reasonable time.

mapdb Examples and Code Snippets

See all related Code Snippets

MapDB: database engine

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Maven snippet, VERSION is [![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.mapdb/mapdb/badge.svg)](https://search.maven.org/#search%7Cga%7C1%7Cg%3A%22org.mapdb%22%20AND%20a%3Amapdb)

```xml
&lt;dependency&gt;
    &lt;groupId&gt;org.mapdb&lt;/groupId&gt;
    &lt;artifactId&gt;mapdb&lt;/artifactId&gt;
    &lt;version&gt;VERSION&lt;/version&gt;
&lt;/dependency&gt;
```

Hello world:

```java
//import org.mapdb.*
DB db = DBMaker.memoryDB().make();
ConcurrentMap map = db.hashMap("map").make();
map.put("something", "here");
```

You can continue with [quick start](https://jankotek.gitbooks.io/mapdb/content/quick-start/) or refer to the  [documentation](https://jankotek.gitbooks.io/mapdb/).

Support
------------

More [details](http://www.mapdb.org/support/).

Development
--------------------

MapDB is written in Kotlin, you will need IntelliJ Idea.

You can use Gradle to build MapDB.

MapDB is extensively unit-tested.
By default, only tiny fraction of all tests are executed, so build finishes under 10 minutes.
Full test suite has over million test cases and runs for several hours/days.
To run full test suite, set `-Dmdbtest=1` VM option.

Longer unit tests might require more memory. Use this to increase heap memory assigned to unit tests: `-DtestArgLine="-Xmx3G"`

By default unit tests are executed in 3 threads. Thread count is controlled by `-DtestThreadCount=3` property

On machine with limited memory you can change fork mode so unit test consume less RAM, but run longer: `-DtestReuseForks=false`

Editing array also changes another array

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string[] _CompleteMap = CurrentMap.MapData;

string[] _CompleteMap = CurrentMap.MapData.ToArray();

class Person
{
    public string Name { get; set; }
}

class Program
{
    static void Main()
    {
        // Original array has a person named John
        Person[] people = new [] { new Person { Name = "John" } };

        // Create a shallow copy of the array
        Person[] peopleCopy = people.ToArray();

        // Change John's name in the copy
        peopleCopy[0].Name = "James";

        // At this point, people[0].Name is also "James", since it's the same person!

        // However changes to the array itself are discreet
        peopleCopy[0] = new Person { Name = "Mary" };

        // At this point, people[0].Name is still "James", since we did
        // not modify the existing object, but instead created a new one
    }
}

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

string[] _CompleteMap = CurrentMap.MapData;

string[] _CompleteMap = CurrentMap.MapData.ToArray();

class Person
{
    public string Name { get; set; }
}

class Program
{
    static void Main()
    {
        // Original array has a person named John
        Person[] people = new [] { new Person { Name = "John" } };

        // Create a shallow copy of the array
        Person[] peopleCopy = people.ToArray();

        // Change John's name in the copy
        peopleCopy[0].Name = "James";

        // At this point, people[0].Name is also "James", since it's the same person!

        // However changes to the array itself are discreet
        peopleCopy[0] = new Person { Name = "Mary" };

        // At this point, people[0].Name is still "James", since we did
        // not modify the existing object, but instead created a new one
    }
}

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

string[] _CompleteMap = CurrentMap.MapData;

string[] _CompleteMap = CurrentMap.MapData.ToArray();

class Person
{
    public string Name { get; set; }
}

class Program
{
    static void Main()
    {
        // Original array has a person named John
        Person[] people = new [] { new Person { Name = "John" } };

        // Create a shallow copy of the array
        Person[] peopleCopy = people.ToArray();

        // Change John's name in the copy
        peopleCopy[0].Name = "James";

        // At this point, people[0].Name is also "James", since it's the same person!

        // However changes to the array itself are discreet
        peopleCopy[0] = new Person { Name = "Mary" };

        // At this point, people[0].Name is still "James", since we did
        // not modify the existing object, but instead created a new one
    }
}

org.mapdb.DBException$SerializationError when storing JSONArray in MapDB using ELSA Serialization

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Class SomeClassSerialzer extends GroupSerializerObjectArray<SomeClass> {
@Override
    public void serialize(DataOutput2 dataOutput2, SomeClass someClass) throws IOException {
        dataOutput2.writeLong(someClass.getLong());
        dataOutput2.writeUTF(threatSourceData.getJSONArray().toString());
    }

    @Override
    public SomeClass deserialize(DataInput2 dataInput2, int i) throws IOException {
        JSONArray jsonArray = null;
        Long longValue = dataInput2.readLong();
        try {
            categories = new JSONArray(dataInput2.readUTF());
        } catch (JSONException ignored) {
        }
        return new SomeClass(reputation, categories);
    }
}

NavigableMap<Long,SomeClass> treeMap = mapDB.treeMap(treeName).keySerializer(Serializer.LONG).valueSerializer(new ThreatSourceDataSerializer()).createOrOpen();

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

Class SomeClassSerialzer extends GroupSerializerObjectArray<SomeClass> {
@Override
    public void serialize(DataOutput2 dataOutput2, SomeClass someClass) throws IOException {
        dataOutput2.writeLong(someClass.getLong());
        dataOutput2.writeUTF(threatSourceData.getJSONArray().toString());
    }

    @Override
    public SomeClass deserialize(DataInput2 dataInput2, int i) throws IOException {
        JSONArray jsonArray = null;
        Long longValue = dataInput2.readLong();
        try {
            categories = new JSONArray(dataInput2.readUTF());
        } catch (JSONException ignored) {
        }
        return new SomeClass(reputation, categories);
    }
}

NavigableMap<Long,SomeClass> treeMap = mapDB.treeMap(treeName).keySerializer(Serializer.LONG).valueSerializer(new ThreatSourceDataSerializer()).createOrOpen();

I want to add a property to JSON Object with an array of integers as a value in Java

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private void simpleJsonObjectWithArrayAsValue() throws JSONException {
    JSONObject jo = new JsonObject();
    jo.put("id", Json.createValue(1));
    jo.put("name", Json.createValue("Whatever"));
    jo.put("indices", Json.createArrayBuilder()
        .add(1)
        .add(2)
        .add(3)
        .build());

    System.out.println("JSON String = " + new StringBuffer().append(jo.toString() + "\n");
}

See all related Code Snippets

Community Discussions

Trending Discussions on mapdb

how BoxStoreBuilder.usePreviousCommit works internally?
Editing array also changes another array
org.mapdb.DBException$SerializationError when storing JSONArray in MapDB using ELSA Serialization
I want to add a property to JSON Object with an array of integers as a value in Java

Trending Discussions on mapdb

QUESTION

how BoxStoreBuilder.usePreviousCommit works internally?

Asked 2021-Nov-08 at 15:09

i converted my android app from mapdb to objectbox, i've seen on github a few people reporting database corruption with objectbox and the solution has always been to call usePreviousCommit in case of problems.

since the objectbox core is close source I wanted to know what usePreviousCommit does internally

are there 2 physical copies of the database? and calling usePreviousCommit reverts to the previous copy?
or does it work in a more complex way? (if yes i wanted to know how)

i opened this question because i want more information from objectbox before i continue to use it in production.

ANSWER

Answered 2021-Nov-08 at 15:09

The key word is multiversion-concurrency. Think of a B+ tree with copy-on-write. The previous root tree (aka the previous commit) is preserved, so you can use when opening.

Source https://stackoverflow.com/questions/69838505

QUESTION

Editing array also changes another array

Asked 2021-Apr-26 at 19:45

So I'm making a little game in the windows console (just for fun and to test theories) but I am having an issue with the DrawGame() method.

I am creating a new string array (string[] _CompleteMap) with its values being assigned from CurrentMap.MapData (which is also a string array):

string[] _CompleteMap = CurrentMap.MapData;

I am using the CurrentMap.MapData as a blank map, then changing characters within the strings to represent the player and mobs. But when I make a change to _CompleteMap it also seems to be changing the values in CurrentMap.MapData...

I have no idea why this is happening and it is leaving a trail of where the user walked.

Any support would be helpful and I can post the code if required.

using System;
using System.Text;
using System.Threading;
using ConsoleAdventure.Engine.BaseClasses;
using Database = ConsoleAdventure.Engine.Database;

namespace ConsoleAdventure
{
    class Program
    {
        private static bool whileGameScene = true;
        private static Engine.BaseClasses.MapBase CurrentMap;

        static unsafe void Main(string[] args)
        {
            // Load and populate the databases.
            Database.ItemDB.LoadItemDB();
            Database.MapDB.LoadMapDB();

            // Set demo map
            CurrentMap = Database.MapDB.Maps[0];

            // Hide cursor
            Console.CursorVisible = false;

            // Start a new thread to capture the user inputs
            new Thread(() =>
                        {
                            while (true)
                            {
                                Thread.CurrentThread.IsBackground = true;

                                ConsoleKeyInfo cki = Console.ReadKey();

                                if (cki.Key == ConsoleKey.A && Player.Data.Location.X > 0)
                                    Player.Data.Location.X--;
                                else if (cki.Key == ConsoleKey.D)
                                    Player.Data.Location.X++;
                                else if (cki.Key == ConsoleKey.W && Player.Data.Location.Y > 0)
                                    Player.Data.Location.Y--;
                                else if (cki.Key == ConsoleKey.S)
                                    Player.Data.Location.Y++;

                                CheckWarpPoints();
                            }        
                        }).Start();

            // Draw the game
            while (whileGameScene)
            {
                DrawGame();
            }
        }

        /// <summary>
        /// Check if player has stood on a warp zone
        /// </summary>
        private static void CheckWarpPoints()
        {
            foreach (MapBase.WarpPoint warp in Database.MapDB.Maps[Player.Data.CurrentMap].WarpPoints)
            {
                if (Player.Data.Location.X == warp.From.X && Player.Data.Location.Y == warp.From.Y)
                {
                    Player.Data.CurrentMap = warp.ToMapIndex;
                    Player.Data.Location = warp.To;
                }
            }
        }

        public static void DrawGame()
        {
            string[] _CompleteMap = CurrentMap.MapData;

            StringBuilder _sbRow = new StringBuilder();

            foreach (var _object in CurrentMap.MapObjects)
            {
                _sbRow = new StringBuilder(_CompleteMap[_object.CurrentLocation.Y]);
                _sbRow[_object.CurrentLocation.X] = _object.Icon;
                _CompleteMap[_object.CurrentLocation.Y] = _sbRow.ToString();
            }

            _sbRow = new StringBuilder(_CompleteMap[Player.Data.Location.Y]);
            _sbRow[Player.Data.Location.X] = 'X';
            _CompleteMap[Player.Data.Location.Y] = _sbRow.ToString();

            for (int i = 0; i < _CompleteMap.Length; i++)
            {
                Console.SetCursorPosition(0, i);
                Console.WriteLine(_CompleteMap[i]);
            }
        }
    }
}

ANSWER

Answered 2021-Apr-26 at 19:45

Since arrays are reference types, when you do this:

string[] _CompleteMap = CurrentMap.MapData;

You're essentially creating a new variable that points to the same memory location as CurrentMap.MapData, and any changes you make to that location through _CompleteMap will also show up when you refer to the location via CurrentMap.MapData.

Instead you can create a new array based on the contents of the existing array:

string[] _CompleteMap = CurrentMap.MapData.ToArray();

Now it's pointing to a different location, so modifications to the array in this location will not affect the array in the original location.

One thing to note, however, is that if MapData were an array of a reference type and you used ToArray() to make a copy of it, then even though you now have a new array containing the same data, if you manipulate one of the objects in the copy of the array, the change to that object will appear in the original array as well.

This is because we did a shallow copy. If we didn't want this behavior, then we'd need to do a deep copy instead, where we also create new (cloned) instances of every object in the array as well. Something for you to research!!

For example:

class Person
{
    public string Name { get; set; }
}

class Program
{
    static void Main()
    {
        // Original array has a person named John
        Person[] people = new [] { new Person { Name = "John" } };

        // Create a shallow copy of the array
        Person[] peopleCopy = people.ToArray();

        // Change John's name in the copy
        peopleCopy[0].Name = "James";

        // At this point, people[0].Name is also "James", since it's the same person!

        // However changes to the array itself are discreet
        peopleCopy[0] = new Person { Name = "Mary" };

        // At this point, people[0].Name is still "James", since we did
        // not modify the existing object, but instead created a new one
    }
}

Source https://stackoverflow.com/questions/67270153

QUESTION

org.mapdb.DBException$SerializationError when storing JSONArray in MapDB using ELSA Serialization

Asked 2020-Jul-06 at 03:49

I have a class that store a Long value and JSONArray.

Class SomeClass {
    private Long longValue;
    private JSONArray jsonArray;
    //Default and parameterised constructors.
    //Getters and Setters.
}

I'm storing these values in a NavigableMap<?, SomeClass>. ? - String / Long. I get a treeMap from MapDB as follows:

private DB mapDB = MapDBUtil.getMapDB(); //Opening or creating and getting MapDB DB object
NavigableMap<Long,SomeClass> treeMap = mapDB.treeMap(treeName).keySerializer(Serializer.LONG).valueSerializer(Serializer.ELSA).createOrOpen();

When I try to add some value to the map obtained, say:

SomeClass instance = new SomeClass("Hello", jsonArray);
treeMap.put("test", instance);

I get org.mapdb.DBException$SerializationError. I figured the issue is due to serializing JSONArray. I want to either implement a custom serializer or use some other way to serialize and store this data. I tried implementing Serializable and also ElsaSerializer in 'SomeClass' but both of those don't seem to work. I have also tried to use Serializer.JAVA when Serializable interface is implemented but that doesn't work too. I'm not sure about what I'm doing wrong. Any help would be really appreciated.

ANSWER

Answered 2020-Jul-06 at 03:49

I ended up fixing it by implementing a custom serializer and using it as follows:

Class SomeClassSerialzer extends GroupSerializerObjectArray<SomeClass> {
@Override
    public void serialize(DataOutput2 dataOutput2, SomeClass someClass) throws IOException {
        dataOutput2.writeLong(someClass.getLong());
        dataOutput2.writeUTF(threatSourceData.getJSONArray().toString());
    }

    @Override
    public SomeClass deserialize(DataInput2 dataInput2, int i) throws IOException {
        JSONArray jsonArray = null;
        Long longValue = dataInput2.readLong();
        try {
            categories = new JSONArray(dataInput2.readUTF());
        } catch (JSONException ignored) {
        }
        return new SomeClass(reputation, categories);
    }
}

When getting BTreeMap from MapDB, use the SomeClassSerialzer as follows:

NavigableMap<Long,SomeClass> treeMap = mapDB.treeMap(treeName).keySerializer(Serializer.LONG).valueSerializer(new ThreatSourceDataSerializer()).createOrOpen();

Source https://stackoverflow.com/questions/62742844

QUESTION

I want to add a property to JSON Object with an array of integers as a value in Java

Asked 2020-Jan-16 at 08:45

I want to create a JSON object that the value of one of its properties is an array, it should look as follow:

{
  "id": 1,
  "name": "Whatever",
  "indices": [1, 2, 3, 4]
}

Running the following code:

private void createJsonWithArrayAsPropertyValue() throws IOException {
    JsonObjectBuilder job = Json.createObjectBuilder();
    job.add("id", 1);
    job.add("name", "no-name");
    job.add("indices", Json.createArrayBuilder()
            .add(1)
            .add(2)
            .add(3)
            .build());
    System.out.println(new StringBuffer("\tJSON String = ").append(job.toString()).append("\n"));

    JsonObject jsonObject = job.build();
    Writer writer = new StringWriter();

    //  region Print the JSON object into a String
    Json.createWriter(writer).write(jsonObject);
    StringBuffer jsonString = new StringBuffer(writer.toString());
    System.out.println(new StringBuffer("\tjsonString = ").append(jsonString).append("\n"));
    //  endregion

    //  region Print the JSON using PRETTY_PRINTING format
    Map<String, Boolean> config = new HashMap<>();
    config.put(JsonGenerator.PRETTY_PRINTING, true);
    JsonWriterFactory writerFactory = Json.createWriterFactory(config);
    writer = new StringWriter();
    writerFactory.createWriter(writer).write(jsonObject);
    jsonString = new StringBuffer(writer.toString());
    System.out.println(new StringBuffer("\tjsonString (PRETTY_PRINTING) = ").append(jsonString).append("\n"));
    //  endregion Print the JSON using PRETTY_PRINTING format
    System.out.println("-------------------------------------------------");

}

Creates the JSON Object using com.json.JSONObject the indices property is entered as a string:

{
  "id": 1,
  "name": "Whatever",
  "indices": "[1, 2, 3]"
}

I am looking for a solution that will not enter the element value as a string and I am not limited to use any specific package.

UPDATE Using javax.json.Json as such:

    jo.put("indices", Json.createArrayBuilder()
            .add(1)
            .add(2)
            .add(3)
            .build());

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.beniregev</groupId>
    <artifactId>demos_and_tutorials</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demos_and_tutorials</name>
    <description>Java 8 + Spring Boot project for demos and tutorials</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Hoxton.RC1</spring-cloud.version>
        <javafaker.version>0.17.2</javafaker.version>
        <mapdb.version>3.0.7</mapdb.version>
        <android-json.version>0.0.20131108.vaadin1</android-json.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-amqp</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-rest</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-oauth2-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-oauth2-resource-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-websocket</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.session</groupId>
            <artifactId>spring-session-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.json/javax.json-api -->
        <dependency>
            <groupId>javax.json</groupId>
            <artifactId>javax.json-api</artifactId>
            <version>1.1.4</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.glassfish/javax.json -->
        <dependency>
            <groupId>org.glassfish</groupId>
            <artifactId>javax.json</artifactId>
            <version>1.1.4</version>
        </dependency>
        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>com.github.javafaker</groupId>
            <artifactId>javafaker</artifactId>
            <version>${javafaker.version}</version>
        </dependency>
        <dependency>
            <groupId>io.projectreactor</groupId>
            <artifactId>reactor-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.mapdb/mapdb -->
        <dependency>
            <groupId>org.mapdb</groupId>
            <artifactId>mapdb</artifactId>
            <version>${mapdb.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.amqp</groupId>
            <artifactId>spring-rabbit-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.vaadin.external.google</groupId>
            <artifactId>android-json</artifactId>
            <version>${android-json.version}</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
        </repository>
    </repositories>

</project>

UPDATE 2: I added dependency for org.glassfish so javax.json can run, as it say on Java JSON Tutorial - JSON Java and also on Java API for JSON Processing - Getting Started. Update 3 The exception I got because of a conflict between dependencies in my pom.xml, I moved my code to a separate project and it works.

I receive an exception (I missing something in my pom.xml?):

javax.json.JsonException: Provider org.glassfish.json.JsonProviderImpl not found
    at javax.json.spi.JsonProvider.provider(JsonProvider.java:99)
    at javax.json.Json.createArrayBuilder(Json.java:262)
    at com.beniregev.demos_and_tutorials.demos.JsonDemo.simpleJsonObjectWithArrayAsValue(JsonDemo.java:41)
    at com.beniregev.demos_and_tutorials.demos.JsonDemo.main(JsonDemo.java:57)
Caused by: java.lang.ClassNotFoundException: org.glassfish.json.JsonProviderImpl
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
    at java.base/java.lang.Class.forName0(Native Method)
    at java.base/java.lang.Class.forName(Class.java:315)
    at javax.json.spi.JsonProvider.provider(JsonProvider.java:96)
    ... 3 more

I will appreciate any assistance.

ANSWER

Answered 2020-Jan-15 at 16:04

Per the docs on JSONObject you need to use Json.createArrayBuilder():

private void simpleJsonObjectWithArrayAsValue() throws JSONException {
    JSONObject jo = new JsonObject();
    jo.put("id", Json.createValue(1));
    jo.put("name", Json.createValue("Whatever"));
    jo.put("indices", Json.createArrayBuilder()
        .add(1)
        .add(2)
        .add(3)
        .build());

    System.out.println("JSON String = " + new StringBuffer().append(jo.toString() + "\n");
}

If you have an existing array you'll need to loop over it and call .add() for each element.

Source https://stackoverflow.com/questions/59754426

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