Why Json test program doesn't work?

Question

When I run a Json test program with jdk 7, it says :

Exception in thread "main" javax.json.JsonException: Provider org.glassfish.json.JsonProviderImpl not found     at javax.json.spi.JsonProvider.provider(JsonProvider.java:97)     at javax.json.Json.createArrayBuilder(Json.java:257)" 

I've included "javax.json-api-1.0.jar" in my project.

import javax.json.Json; import javax.json.JsonArray; import javax.json.JsonArrayBuilder; import java.io.Serializable; import java.util.ArrayList; import java.util.Date; import java.util.List;  public class JsonExample {   public static void main(String[] args)   {     List<User> users=getUsers();      // build JSON     JsonArrayBuilder jsonArrayBuilder=Json.createArrayBuilder();     for (User user : users)     {       jsonArrayBuilder.add(         Json.createObjectBuilder()         .add("id",user.getId())         .add("name",user.getName())         .add("join",user.getJoin().getTime()));     }      JsonArray usersJson=jsonArrayBuilder.build();      System.out.println(usersJson.toString());    }    // dummy users   public static List<User> getUsers()   {     List<User> users=new ArrayList<User>(10);     User user=new User();     user.setId(1);     user.setName("Hero");     user.setJoin(new Date());     users.add(user);      user=new User();     user.setId(2);     user.setName("Citizen");     user.setJoin(new Date());     users.add(user);      return users;   }    // POJO   public static class User implements Serializable   {     private long id;     private String name;     private Date join;      public long getId()     {       return id;     }      public void setId(long id)     {       this.id=id;     }      public String getName()     {       return name;     }      public void setName(String name)     {       this.name=name;     }      public Date getJoin()     {       return join;     }      public void setJoin(Date join)     {       this.join=join;     }   } } 

It's a simple program, not using galssfish, why is glassfish mentioned here ?

Answer 1

javax.json-api-1.0.jar contains only API which is there for compile time dependency. But if you want to run your app, you need a provider / impl classes.

org.glassfish:javax.json is the jar you need that contains both api + impl classes.

<dependency>     <groupId>org.glassfish</groupId>     <artifactId>javax.json</artifactId>     <version>1.0.4</version> </dependency> 

See this thread for more details.