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Initializing log4j is causing a NPE
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Initializing log4j is causing a NPE

  • Subject: Initializing log4j is causing a NPE
  • From: David Avendasora <email@hidden>
  • Date: Wed, 23 Jan 2008 08:09:38 -0500
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);

Thanks,

Dave
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