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This examples shows how to customize jsonb for a JAX-RS Application. JSONB is the new javaee-api:8.0 standard for json serialization/deserialization. Few annotations are needed and JsonbConfig offers many configurations.

Run and test Endpoint

the application can be run with 'mvn clean install tomee:run' if port 8080 is available you can invoke the following endpoint: (GET) http://localhost:8080/mp-jsonb-configuration/api/users that should respond with the following json:
[
{
"Id":1,
"Name":"user 1",
"Registration":"2018 - 12 - 28"
},
{
"Id":2,
"Name":"user 2",
"Registration":"2018 - 12 - 28"
}
]

@ApplicationPath

JAXRS entry point class, as follows jaxrs will load all the annotated @Path classes and methods without specifying them.

import javax.ws.rs.ApplicationPath;
import javax.ws.rs.core.Application;

@ApplicationPath("api")
public class JAXRSApplication extends Application {

}

@Path Rest resource

Simple jaxrs class with a GET endpoint

import java.util.ArrayList;
import java.util.List;

import javax.ejb.Stateless;
import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

import org.superbiz.model.User;

@Path("users")
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
@Stateless
public class UserService {

    @GET
    public List<User> users() {
       List<User> users = new ArrayList<>();
       User user1 = new User(1, "user 1");
       User user2 = new User(2, "user 2");
       users.add(user1);
       users.add(user2);

       return users;
    }
}

JSONB Configuration

Implementing ContextResolver<> you can customize jaxrs defaults, in this example we are going to customize JSONB serialization/deserialization

import javax.json.bind.Jsonb;
import javax.json.bind.JsonbBuilder;
import javax.json.bind.JsonbConfig;
import javax.json.bind.config.PropertyNamingStrategy;
import javax.ws.rs.ext.ContextResolver;
import javax.ws.rs.ext.Provider;

@Provider
public class JSONBConfiguration implements ContextResolver<Jsonb> {

    private Jsonb jsonb;

    public JSONBConfiguration() {
       // jsonbConfig offers a lot of configurations.
       JsonbConfig config = new JsonbConfig().withFormatting(true)
          .withPropertyNamingStrategy(PropertyNamingStrategy.UPPER_CAMEL_CASE)
          .withDateFormat("yyyy - MM - dd", Locale.ENGLISH);

       jsonb = JsonbBuilder.create(config);
    }

    @Override
    public Jsonb getContext(Class<?> type) {
       return jsonb;
    }

}

JsonbConfig offers many configurations.

Accessing the rest endpoint

The test spin up an openejb webapp and invoke the users endpoint

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.apache.cxf.jaxrs.client.WebClient;
import org.apache.openejb.jee.WebApp;
import org.apache.openejb.junit.ApplicationComposer;
import org.apache.openejb.testing.Classes;
import org.apache.openejb.testing.EnableServices;
import org.apache.openejb.testing.Module;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.superbiz.JAXRSApplication;
import org.superbiz.JSONBConfiguration;

@EnableServices(value = "jaxrs")
@RunWith(ApplicationComposer.class)
public class UserServiceTest {

    @Module
    @Classes({ UserService.class, JAXRSApplication.class, JSONBConfiguration.class })
    public WebApp app() {
       return new WebApp().contextRoot("test");
    }

    @Test
    public void get() throws IOException {
       final String message = WebClient.create("http://localhost:4204").path("/test/api/users").get(String.class);
       System.out.println(message);

       final SimpleDateFormat sdf = new SimpleDateFormat("yyyy - MM - dd");

       // test withDateFormat("yyyy - MM - dd")
       Assert.assertTrue(message.contains(sdf.format(new Date())));
       // test withFormatting(true)
       Assert.assertTrue(message.contains(System.getProperty("line.separator")));
    }

}

Running

Running the example can be done from maven with a simple 'mvn clean install' command run from the 'mp-jsonb-configuration' directory.

When run you should see output similar to the following.

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running org.superbiz.rest.UserServiceTest
INFO - Created new singletonService org.apache.openejb.cdi.ThreadSingletonServiceImpl@7823a2f9
INFO - Succeeded in installing singleton service
INFO - Cannot find the configuration file [conf/openejb.xml].  Will attempt to create one for the beans deployed.
INFO - Configuring Service(id=Default Security Service, type=SecurityService, provider-id=Default Security Service)
INFO - Configuring Service(id=Default Transaction Manager, type=TransactionManager, provider-id=Default Transaction Manager)
INFO - Creating TransactionManager(id=Default Transaction Manager)
INFO - Creating SecurityService(id=Default Security Service)
INFO - Initializing network services
INFO - Creating ServerService(id=cxf-rs)
INFO - Creating ServerService(id=httpejbd)
INFO - Created ServicePool 'httpejbd' with (10) core threads, limited to (200) threads with a queue of (9)
INFO - Initializing network services
INFO -   ** Bound Services **
INFO -   NAME                 IP              PORT  
INFO -   httpejbd             127.0.0.1       4204  
INFO - -------
INFO - Ready!
INFO - Configuring enterprise application: /home/federico/Documents/PRIVATO/Apache/tomee/examples/mp-jsonb-configuration/UserServiceTest
INFO - Auto-deploying ejb UserService: EjbDeployment(deployment-id=UserService)
INFO - Configuring Service(id=Default Managed Container, type=Container, provider-id=Default Managed Container)
INFO - Auto-creating a container for bean org.superbiz.rest.UserServiceTest: Container(type=MANAGED, id=Default Managed Container)
INFO - Creating Container(id=Default Managed Container)
INFO - Using directory /tmp for stateful session passivation
INFO - Configuring Service(id=Default Stateless Container, type=Container, provider-id=Default Stateless Container)
INFO - Auto-creating a container for bean UserService: Container(type=STATELESS, id=Default Stateless Container)
INFO - Creating Container(id=Default Stateless Container)
INFO - Enterprise application "/home/federico/Documents/PRIVATO/Apache/tomee/examples/mp-jsonb-configuration/UserServiceTest" loaded.
INFO - Creating dedicated application classloader for UserServiceTest
INFO - Assembling app: /home/federico/Documents/PRIVATO/Apache/tomee/examples/mp-jsonb-configuration/UserServiceTest
INFO - Jndi(name=UserServiceLocalBean) --> Ejb(deployment-id=UserService)
INFO - Jndi(name=global/test/UserService!org.superbiz.rest.UserService) --> Ejb(deployment-id=UserService)
INFO - Jndi(name=global/test/UserService) --> Ejb(deployment-id=UserService)
INFO - Created Ejb(deployment-id=UserService, ejb-name=UserService, container=Default Stateless Container)
INFO - Started Ejb(deployment-id=UserService, ejb-name=UserService, container=Default Stateless Container)
INFO - Using readers:
INFO -      org.apache.cxf.jaxrs.provider.PrimitiveTextProvider@2f94c4db
INFO -      org.apache.cxf.jaxrs.provider.FormEncodingProvider@6b5966e1
INFO -      org.apache.cxf.jaxrs.provider.MultipartProvider@65e61854
INFO -      org.apache.cxf.jaxrs.provider.SourceProvider@1568159
INFO -      org.apache.cxf.jaxrs.provider.JAXBElementTypedProvider@4fcee388
INFO -      org.apache.cxf.jaxrs.provider.JAXBElementProvider@6f80fafe
INFO -      org.apache.openejb.server.cxf.rs.johnzon.TomEEJsonbProvider@63cd604c
INFO -      org.apache.openejb.server.cxf.rs.johnzon.TomEEJsonpProvider@593e824f
INFO -      org.apache.cxf.jaxrs.provider.StringTextProvider@72ccd81a
INFO -      org.apache.cxf.jaxrs.provider.BinaryDataProvider@6d8792db
INFO -      org.apache.cxf.jaxrs.provider.DataSourceProvider@64bc21ac
INFO - Using writers:
INFO -      org.apache.johnzon.jaxrs.WadlDocumentMessageBodyWriter@493dfb8e
INFO -      org.apache.cxf.jaxrs.nio.NioMessageBodyWriter@5d25e6bb
INFO -      org.apache.cxf.jaxrs.provider.StringTextProvider@72ccd81a
INFO -      org.apache.cxf.jaxrs.provider.JAXBElementTypedProvider@4fcee388
INFO -      org.apache.cxf.jaxrs.provider.PrimitiveTextProvider@2f94c4db
INFO -      org.apache.cxf.jaxrs.provider.FormEncodingProvider@6b5966e1
INFO -      org.apache.cxf.jaxrs.provider.MultipartProvider@65e61854
INFO -      org.apache.cxf.jaxrs.provider.SourceProvider@1568159
INFO -      org.apache.cxf.jaxrs.provider.JAXBElementProvider@6f80fafe
INFO -      org.apache.openejb.server.cxf.rs.johnzon.TomEEJsonbProvider@63cd604c
INFO -      org.apache.openejb.server.cxf.rs.johnzon.TomEEJsonpProvider@593e824f
INFO -      org.apache.cxf.jaxrs.provider.BinaryDataProvider@6d8792db
INFO -      org.apache.cxf.jaxrs.provider.DataSourceProvider@64bc21ac
INFO - Using exception mappers:
INFO -      org.apache.cxf.jaxrs.impl.WebApplicationExceptionMapper@361c294e
INFO -      org.apache.openejb.server.cxf.rs.EJBExceptionMapper@6fff253c
INFO -      org.apache.cxf.jaxrs.validation.ValidationExceptionMapper@7859e786
INFO -      org.apache.openejb.server.cxf.rs.CxfRsHttpListener$CxfResponseValidationExceptionMapper@285d851a
INFO - REST Application: http://127.0.0.1:4204/test/api       -> org.superbiz.JAXRSApplication@5af28b27
INFO -      Service URI: http://127.0.0.1:4204/test/api/users ->  EJB org.superbiz.rest.UserService
INFO -               GET http://127.0.0.1:4204/test/api/users ->      List<User> users()
INFO - Deployed Application(path=/home/federico/Documents/PRIVATO/Apache/tomee/examples/mp-jsonb-configuration/UserServiceTest)
[
  {
    "Id":1,
    "Name":"user 1",
    "Registration":"2018 - 12 - 28"
  },
  {
    "Id":2,
    "Name":"user 2",
    "Registration":"2018 - 12 - 28"
  }
]
INFO - Undeploying app: /home/federico/Documents/PRIVATO/Apache/tomee/examples/mp-jsonb-configuration/UserServiceTest
INFO - Stopping network services
INFO - Stopping server services
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 2.203 sec

Results :

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0

Inside the jar

javaee-api:8.0 brings in all the dependencies needed to spin up a working REST application.

If we look at the jar built by maven, we'll see the application itself is quite small:

$ jar tvf target/mp-jsonb-configuration-8.0.0-SNAPSHOT.war 
     0 Fri Dec 28 19:36:10 CET 2018 META-INF/
   134 Fri Dec 28 19:36:08 CET 2018 META-INF/MANIFEST.MF
     0 Fri Dec 28 19:36:08 CET 2018 WEB-INF/
     0 Fri Dec 28 19:36:08 CET 2018 WEB-INF/classes/
     0 Fri Dec 28 19:36:08 CET 2018 WEB-INF/classes/org/
     0 Fri Dec 28 19:36:08 CET 2018 WEB-INF/classes/org/superbiz/
     0 Fri Dec 28 19:36:08 CET 2018 WEB-INF/classes/org/superbiz/model/
     0 Fri Dec 28 19:36:08 CET 2018 WEB-INF/classes/org/superbiz/rest/
  1165 Fri Dec 28 19:36:06 CET 2018 WEB-INF/classes/org/superbiz/model/User.class
   402 Fri Dec 28 19:36:06 CET 2018 WEB-INF/classes/org/superbiz/JAXRSApplication.class
  1194 Fri Dec 28 19:36:06 CET 2018 WEB-INF/classes/org/superbiz/rest/UserService.class
  1701 Fri Dec 28 19:36:06 CET 2018 WEB-INF/classes/org/superbiz/JSONBConfiguration.class
  1224 Fri Dec 28 18:28:32 CET 2018 WEB-INF/web.xml
     0 Fri Dec 28 19:36:10 CET 2018 META-INF/maven/
     0 Fri Dec 28 19:36:10 CET 2018 META-INF/maven/org.superbiz/
     0 Fri Dec 28 19:36:10 CET 2018 META-INF/maven/org.superbiz/mp-jsonb-configuration/
  1791 Fri Dec 28 19:10:44 CET 2018 META-INF/maven/org.superbiz/mp-jsonb-configuration/pom.xml
   128 Fri Dec 28 19:36:08 CET 2018 META-INF/maven/org.superbiz/mp-jsonb-configuration/pom.properties

This single jar could be deployed any any compliant Java EE implementation. In TomEE you'd simply place it in the tomee.home/webapps/ directory.