0 Replies Latest reply on Oct 11, 2013 5:36 AM by pcg4m3s

Persistence context injected in Restful web service jersey on Jboss is always null

pcg4m3s Oct 11, 2013 5:36 AM

I'm implementing a simple web service using Jersey.

I must to save a person (calling a restful resource) on my database postgres connected to jboss datasource.

When I call the restful resource, the entity manager is always null.

This is my persistence.xml:

<?xml version="1.0" encoding="UTF-8"?>

<persistence version="2.1"

xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">

<persistence-unit name="JerseyRest" transaction-type="JTA">

<provider>org.hibernate.ejb.HibernatePersistence</provider>

<jta-data-source>java:jboss/datasources/myDS</jta-data-source>

<class>mypackage.persistenza.Persona</class>

</properties>

</persistence-unit>

</persistence>

This is my class entity:

package mypackage.persistenza;

import java.io.Serializable;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

import javax.persistence.NamedQueries;

import javax.persistence.NamedQuery;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement

@Entity

@NamedQueries ({

@NamedQuery(name = "Persona.findPersoneByCognome", query = "SELECT p FROM Persona p WHERE p.cognome = :cognome"),

@NamedQuery(name = "Persona.getPersone", query = "SELECT p FROM Persona p"),

@NamedQuery(name = "Persona.findPersoneByCognomeNome", query = "SELECT p FROM Persona p WHERE p.cognome = :cognome AND p.nome = :nome")

})

public class Persona implements Serializable{

/**

private static final long serialVersionUID = 1L;

@Id @GeneratedValue

Long id;

String nome;

String cognome;

public Persona() {

}

public Persona(String nome, String cognome) {

super();

this.nome = nome;

this.cognome = cognome;

}

public String getNome() {

return nome;

}

public void setNome(String nome) {

this.nome = nome;

}

public String getCognome() {

return cognome;

}

public void setCognome(String cognome) {

this.cognome = cognome;

}

public Long getId() {

return id;

}

@Override

public String toString() {

return "Persona [id=" + id + ", nome=" + nome + ", cognome=" + cognome + "]";

}

There are classes used for restful:

package mypackage.restful.jersey;

import mypackage.persistenza.Persona;

import javax.ejb.LocalBean;

import javax.ejb.Stateless;

import javax.ejb.TransactionAttribute;

import javax.ejb.TransactionAttributeType;

import javax.persistence.EntityManager;

import javax.persistence.PersistenceContext;

@Stateless

@LocalBean

public class PersonaRestDAO {

@PersistenceContext

private EntityManager em;

@TransactionAttribute(TransactionAttributeType.REQUIRED)

public void aggiungiPersona(Persona p)

{

em.persist(p);

}

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

package mypackage.restful.jersey;

import mypackage.persistenza.Persona;

import javax.ejb.EJB;

import javax.ejb.LocalBean;

import javax.ejb.Stateless;

import javax.ws.rs.GET;

import javax.ws.rs.Path;

import javax.ws.rs.PathParam;

import javax.ws.rs.core.Response;

@Stateless

@LocalBean

@Path("/persona")

public class PersonaRestWS {

@EJB PersonaRestDAO personaDAO;

// http://localhost:8080/JerseyRest/rest/persona/nuovaPersonaGetParam/nome/cognome

@GET

@Path("/nuovaPersonaGetParam/{nome}/{cognome}")

public Response nuovaPersonaGetParam(@PathParam("nome") String nome, @PathParam("cognome") String cognome) {

personaDAO.aggiungiPersona(new Persona(nome, cognome));

return Response.status(200).entity("elemento inserito").build();

}

This is my web.xml:

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

<servlet-name>MyJersey</servlet-name>

<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>

<init-param>

<param-name>javax.ws.rs.Application</param-name>

<param-value>mypackage.restful.jersey.MyApplication</param-value>

</init-param>

<load-on-startup>1</load-on-startup>

</servlet>

<context-param>

<param-name>resteasy.scan</param-name>

<param-value>false</param-value>

</context-param>

<context-param>

<param-name>resteasy.scan.providers</param-name>

<param-value>false</param-value>

</context-param>

<context-param>

<param-name>resteasy.scan.resources</param-name>

<param-value>false</param-value>

</context-param>

<servlet-mapping>

<servlet-name>MyJersey</servlet-name>

<url-pattern>/rest/*</url-pattern>

</servlet-mapping>

<persistence-context-ref>

<persistence-context-ref-name>mypackage.restful.jersey.PersonaRestDAO/em</persistence-context-ref-name>

<persistence-unit-name>JerseyRest</persistence-unit-name>

</persistence-context-ref>

</web-app>

And this is my pom.xml in my maven project:

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">

<groupId>mygroupid</groupId>

<artifactId>JerseyRest</artifactId>

<version>0.0.1-SNAPSHOT</version>

<groupId>org.eclipse.persistence</groupId>

<artifactId>eclipselink</artifactId>

</dependency>

<groupId>javax.ejb</groupId>

</dependency>

<groupId>org.apache.openejb</groupId>

<artifactId>ejb31-api-experimental</artifactId>

</dependency>

<groupId>com.sun.jersey</groupId>

<artifactId>jersey-servlet</artifactId>

</dependency>

<groupId>com.sun.jersey</groupId>

<artifactId>jersey-core</artifactId>

</dependency>

</dependencies>

<build>

<artifactId>maven-compiler-plugin</artifactId>

</configuration>

</plugin>

</plugins>

</build>

</project>

This is my error message:

java.lang.NullPointerException

mypackage.restful.jersey.PersonaRestWS.nuovaPersonaGetParam(PersonaRestWS.java:35)

sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

java.lang.reflect.Method.invoke(Method.java:606)

com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)

com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205)

com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)

com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)

com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)

com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)

com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)

com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)

com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1511)

com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1442)

com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1391)

com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1381)

com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)

com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:538)

com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:716)

javax.servlet.http.HttpServlet.service(HttpServlet.java:847)