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Re: Initializing log4j is causing a NPE
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Re: Initializing log4j is causing a NPE

  • Subject: Re: Initializing log4j is causing a NPE
  • From: "Daniele Corti" <email@hidden>
  • Date: Wed, 23 Jan 2008 14:15:19 +0100


2008/1/23, David Avendasora <email@hidden>:
I'm sure I'm missing something obvious, but

resourceManager().pathURLForResourceNamed( "Resources/log4j.xml" , null, null)

in my Application.java class is returning null when I run my app.  The log4j.xml is in the /Resources/ directory (in both the build and dist directories) and flagged as a Resource. Why isn't it being found? It seems to be an intermittent problem as it has done this before and then suddenly started working.

I get the following NPE in Eclipse Run Log:

[2008-01-23 07:47:16 EST] <main> A fatal exception occurred: null
[2008-01-23 07:47:16 EST] <main> java.lang.NullPointerException
at com.bestmaid.bakeryManagement.server.Application.<init>( Application.java:38 )
at sun.reflect.NativeConstructorAccessorImpl.newInstance0( Native Method )
at sun.reflect.NativeConstructorAccessorImpl.newInstance( NativeConstructorAccessorImpl.java:39 )
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance( DelegatingConstructorAccessorImpl.java:27 )
at java.lang.reflect.Constructor.newInstance( Constructor.java:494 )
at java.lang.Class.newInstance0( Class.java:350 )
at java.lang.Class.newInstance( Class.java:303 )
at com.webobjects.appserver.WOApplication.main( WOApplication.java:323 )
at com.bestmaid.bakeryManagement.server.Application.main( Application.java:23 )

I get the following from Tomcat when it tries to start the deployed application:

java.lang.reflect.InvocationTargetException
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:585)
at com.webobjects.jspservlet.WOServletAdaptor._applicationInit( WOServletAdaptor.java:415 )
at com.webobjects.jspservlet.WOServletAdaptor.initStatics( WOServletAdaptor.java:78 )
at com.webobjects.jspservlet.WOServletAdaptor.init( WOServletAdaptor.java:629 )
at javax.servlet.GenericServlet.init( GenericServlet.java:212)
at org.apache.catalina.core.StandardWrapper.loadServlet( StandardWrapper.java:1161 )
at org.apache.catalina.core.StandardWrapper.load( StandardWrapper.java:981 )
at org.apache.catalina.core.StandardContext.loadOnStartup( StandardContext.java:4045 )
at org.apache.catalina.core.StandardContext.start( StandardContext.java:4351 )
at org.apache.catalina.core.ContainerBase.addChildInternal( ContainerBase.java:791)
at org.apache.catalina.core.ContainerBase.addChild( ContainerBase.java:771)
at org.apache.catalina.core.StandardHost.addChild( StandardHost.java:525)
at org.apache.catalina.startup.HostConfig.deployDescriptor( HostConfig.java:626)
at org.apache.catalina.startup.HostConfig.deployDescriptors( HostConfig.java:553)
at org.apache.catalina.startup.HostConfig.deployApps( HostConfig.java:488)
at org.apache.catalina.startup.HostConfig.start( HostConfig.java:1138)
at org.apache.catalina.startup.HostConfig.lifecycleEvent( HostConfig.java:311)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent( LifecycleSupport.java:117 )
at org.apache.catalina.core.ContainerBase.start( ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start( StandardHost.java:719)
at org.apache.catalina.core.ContainerBase.start( ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start( StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start( StandardService.java:516 )
at org.apache.catalina.core.StandardServer.start( StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start( Catalina.java:566)
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:585)
at org.apache.catalina.startup.Bootstrap.start( Bootstrap.java:288)
at org.apache.catalina.startup.Bootstrap.main( Bootstrap.java:413)
Caused by: com.webobjects.foundation.NSForwardException [java.lang.NullPointerException] null: <com.bestmaid.bakeryManagement.server.Application> failed instantiation. Exception thrown :
java.lang.NullPointerException : null
at com.webobjects.foundation._NSUtilities._explainInstantiationException( _NSUtilities.java:567)
at com.webobjects.foundation._NSUtilities.instantiateObject( _NSUtilities.java:581)
at com.webobjects.appserver.WOApplication.primeApplication( WOApplication.java:411)
... 34 more

If I comment the following out of the Application.java file, it will launch:

URL configURL = resourceManager().pathURLForResourceNamed("Resources/log4j.xml",  null, null );
NSLog.out .appendln("Initializing log4j from " + configURL.toString());
DOMConfigurator.configure(configURL);

try: 
resourceManager().pathURLForResourceNamed( "log4j.xml", null, null)

Thanks,

Dave

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Daniele Corti
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 >Initializing log4j is causing a NPE (From: David Avendasora <email@hidden>)

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