I appreciate the efforts of Arun gupta for publishing Screencast #31: Java EE
6 using GlassFish and Eclipse 3.6 - Oracle Enterprise Pack for Eclipse
11.1.1.6 is now available - 5 new screencasts [1]. This was really helpful.
I tried the examples using
oepe-helios-installer-11.1.1.7.1.201103091755-win32 and ogs-3.1-windows-ml.
While trying the example for JAX-RS (the last one), i facing
NullPointerException while creating entity manager from the injected entity
manager factory. below is the exception stacktrace. It would be helpful,
to you know your insight. This exception occurs exactly while creating
entity manager. However, the same approach works with other example when
entitymanagerfactory is injected to HelloServlet.
SEVERE: The RuntimeException could not be mapped to a response, re-throwing
to the HTTP container
java.lang.NullPointerException
at resource.SimpleResource.getXml(SimpleResource.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.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:167)
at
com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:70)
at
com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:279)
at
com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:86)
at
com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:136)
at
com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:74)
at
com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1347)
at
com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1279)
at
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1229)
at
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1219)
at
com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:419)
at
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)
at
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:699)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at
org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1534)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)
at
com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
at
org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:326)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:227)
at
com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:170)
at
com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:822)
at
com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:719)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1013)
at
com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
at
com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at
com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at
com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at
com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at
com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at
com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at
com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at
com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:662)
WARNING: StandardWrapperValve[JAX-RS Servlet]: PWC1406: Servlet.service() for
servlet JAX-RS Servlet threw exception
java.lang.NullPointerException
at resource.SimpleResource.getXml(SimpleResource.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)
.....
has this behavior of nullpointerexception been observed by anyone?
[1]
http://blogs.sun.com/arungupta/entry/screencast_31_java_ee_6
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