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

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

    ci vi Newbie

      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>

                  <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />

                  <property name="hibernate.hbm2ddl.auto" value="create" />

              </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>

                  <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">

              <modelVersion>4.0.0</modelVersion>

              <groupId>mygroupid</groupId>

              <artifactId>JerseyRest</artifactId>

              <version>0.0.1-SNAPSHOT</version>

              <packaging>war</packaging>

       

              <dependencies>

                  <!-- usato per persistenza -->

                  <dependency>

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

                      <artifactId>eclipselink</artifactId>

                      <version>2.5.0-RC1</version>

                  </dependency>

                  <!-- fine usato per persistenza -->

       

                  <!-- usato per annotation stateless -->

                  <dependency>

                      <groupId>javax.ejb</groupId>

                      <artifactId>ejb-api</artifactId>

                      <version>3.0</version>

                  </dependency>

                  <!-- fine usato per annotation stateless -->

       

                  <!-- usato per annotation localbean -->

                  <dependency>

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

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

                      <version>3.1.1</version>

                  </dependency>

                  <!-- fine usato per annotation localbean -->

       

                  <dependency>

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

                      <artifactId>jersey-servlet</artifactId>

                      <version>1.17.1</version>

                  </dependency>

                  <dependency>

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

                      <artifactId>jersey-core</artifactId>

                      <version>1.17.1</version>

                  </dependency>

              </dependencies>

       

              <build>

                  <plugins>

                      <plugin>

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

                          <version>2.0.2</version>

                          <configuration>

                              <source>1.6</source>

                              <target>1.6</target>

                          </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)