Oh I forgot to say that I use the EJB 3.1 packaging style: everything is in
the same war
2009/2/21 Antonio Goncalves <antonio.mailing_at_gmail.com>
> Hi,
> I have a JAX-RS BookResource that delegates all the database access to a
> stateless BookEJB and I have a JSF managed bean that also uses the same EJB.
> In JSF I get injected the reference of my EJB and I can get data (Book
> entity) out of the database. It works fine. But when I try to do the same
> thing with my resource and get injected a reference from my EJB, I get
> a NullPointerException.
>
> First my EJB was using the new EJB 3.1 style with no interface at all. I
> thought that could be the problem and introduced a local interface, but it
> doesn't work still.
>
> I'm using GlassFish V3b37.
>
> Any idea ?
> Thanks,
> Antonio
>
>
> BookResource
> ==========
>
> @Path("books")
> public class BookResource {
>
> @EJB
> private BookEJBLocal bookEJB;
>
> @GET
> @Path("{id}/")
> @Produces({"application/xml", "application/json"})
> public Book getBookById(@PathParam("id") Long id) {
>
> Book book = bookEJB.findBook(id);
> return book;
> }
>
> @GET @Produces({"application/xml", "application/json"})
> public List<Book> getAllBooks() {
> List<Book> books = bookEJB.findBooks();
> return books;
> }
> }
>
>
> BookEJB
> =======
> @Stateless
> public class BookEJB implements BookEJBLocal {
>
> @PersistenceContext(unitName = "chapter15PU")
> private EntityManager em;
>
> public List<Book> findBooks() {
> Query query = em.createNamedQuery("findAllBooks");
> return query.getResultList();
> }
>
> public Book findBook(Long id) {
> return em.find(Book.class, id);
> }
> }
>
>
> BookEJBLocal
> ===========
> @Local
> public interface BookEJBLocal {
> List<Book> findBooks();
> Book createBook(Book book);
> Book findBook(Long id);
> }
>
>
> The Book entity is annotated with JPA and JAXB
> ===================================
> @XmlRootElement
> @Entity
> @NamedQuery(name = "findAllBooks", query = "SELECT b FROM Book b")
> public class Book {
>
> @Id @GeneratedValue
> private Long id;
> private String title;
> private Float price;
> private String description;
> private String isbn;
> private Integer nbOfPage;
> private Boolean illustrations;
> // getters and setters
> }
>
>
> Stack Trace
> =========
> GRAVE: StandardWrapperValve[Jersey Web Application]: PWC1406:
> Servlet.service() for servlet Jersey Web Application threw exception
> java.lang.NullPointerException
> at
> com.apress.javaee6.chapter15.ex99.BookResource.getBookById(BookResource.java:40)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> com.sun.jersey.server.impl.model.method.dispatch.EntityParamDispatchProvider$TypeOutInvoker._dispatch(EntityParamDispatchProvider
> .java:138)
> at
> com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:67)
> at
> com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:124)
> at
> com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:111)
> at
> com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:71)
> at
> com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:111)
> at
> com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:63)
> at
> com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:555)
> at
> com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:514)
> at
> com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:505)
> at
> com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:359)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
> at
> org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:465)
> at
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:306)
> at
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)
> at
> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:656)
> at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
> at
> com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:98)
> at
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
> at
> org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:346)
> at
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:244)
> at
> com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:181)
> at
> com.sun.grizzly.http.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:646)
> at
> com.sun.grizzly.http.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:568)
> at
> com.sun.grizzly.http.DefaultProcessorTask.process(DefaultProcessorTask.java:821)
> at
> com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:153)
> at
> com.sun.enterprise.v3.services.impl.GlassfishProtocolChain.executeProtocolFilter(GlassfishProtocolChain.java:71)
> at
> com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:103)
> at
> com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:89)
> at
> com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
> at
> com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:67)
> at
> com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:56)
> at
> java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:619)
>
--
--
Antonio Goncalves (antonio.goncalves_at_gmail.com)
Software architect
Paris JUG leader : www.parisjug.org
Web site : www.antoniogoncalves.org
Blog: jroller.com/agoncal
LinkedIn: www.linkedin.com/in/agoncal