EJB NullPointerException JAX-RS REST WebService

Diskutiere EJB NullPointerException JAX-RS REST WebService im Application Tier Bereich.
K

Kokscola

Hi,

ich habe ein REST-WebService im Weblogic mit Jersey nach dem Tutorial erstellt:
Develop an Apache HttpClient client for Android to a JAX-RS web service

Nun möchte ich in meine Resource Klasse eine Bean injizieren. Leider bekomme ich aber eine NullPointerException, wenn ich eine Methode dieser Bean aufrufen möchte. Weill die "@Inject private MessdatenShowBean messdaten;" null ist...

Resource Klasse:
Java:
package test;

import java.math.BigDecimal;

import javax.enterprise.context.RequestScoped;
import javax.inject.Inject;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;

import xx.xxxx.xxx.xxx.xxx.MessdatenShowBean;

@RequestScoped
@Path("/helloworld")
public class Resource {

	@Inject
	private MessdatenShowBean messdaten;

	@GET
	@Path("/getMessdatenShow")
	public BigDecimal getMessdaten() {		
		return messdaten.getLastValues("XXXXX").getAusNum();
	}

	@GET
	@Produces("text/html")
	@Path("/html")
	public String getHTMLMessage() {

		return "<html> " + "<title>" + "TEST CONNECTION JAX-RS" + "</title>" + "<body><center><h1>" + "TEST CONNECTION JAX-RS" + "</body></h1></center>" + "</html>";

	}
}
Die "getMessdaten()"-Methode liefert ein NullPointerException. Die "getHTMLMessage"-Methode gibt den angegebenen String aus.

MessdatenShowBean:
Java:
/**
 * 
 */
package xx.xxxx.xxx.xxx.xxx;

import ....

@Remote(MessdatenShow.class)
@TransactionManagement(value = TransactionManagementType.BEAN)
@Stateless(name = "MessdatenShowBean", mappedName = "xx.xxxx.xxx.xxx.xxx.MessdatenShowBean")
@Local
public class MessdatenShowBean implements MessdatenShow
{
  @PersistenceContext(unitName = "xx.xxxx.xxx.xxx.xxxx")
  private EntityManager em;


  @Resource
  private SessionContext ctx;

  
  private Logger logger;
  private LogMessageBuilder<MessdatenShowBean> lmb;


  /**
   * Default constructor.
   */
  public MessdatenShowBean()
  {
  }


  @PostConstruct
  private void initialize()
  {
    this.logger = new LoggerFactory().getLoggerInstance();
    this.lmb = new LogMessageBuilder<>(this, this.ctx);
    this.logger.debug("[email protected]"); //$NON-NLS-1$
  }

....
Fehlermeldung im Server, wenn ich die getMessdaten()-Methode aufrufe:

Java:
<07.02.2014 15:05 Uhr MEZ> <Error> <HTTP> <WL-101020> <[[email protected][app:xx.xxxx.xxx.xxxEAR module:test-app path:null spec-version:3.0]] Servlet failed with an Exception
java.lang.NullPointerException
	at test.Resource.getMessdaten(Resource.java:23)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:601)
	at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
	at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:185)
	at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
	at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)
	at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
	at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
	at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
	at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
	at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1511)
	at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1442)
	at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1391)
	at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1381)
	at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
	at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:538)
	at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:716)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:844)
	at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:280)
	at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:254)
	at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:136)
	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:341)
	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:238)
	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3363)
	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3333)
	at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
	at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
	at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:57)
	at weblogic.servlet.internal.WebAppServletContext.doSecuredExecute(WebAppServletContext.java:2220)
	at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2146)
	at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2124)
	at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1564)
	at weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:254)
	at weblogic.work.ExecuteThread.execute(ExecuteThread.java:295)
	at weblogic.work.ExecuteThread.run(ExecuteThread.java:254)
>
Kann mir jemand ein Tipp geben warum ich die Bean nicht injiziert bekomme?

Danke.
 
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Thema: 

EJB NullPointerException JAX-RS REST WebService

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