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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 15:32:17 +0100
Hi,
Well I've said to change "Resource/log4j.xml" to "log4j.xml" because the API for pathURLForResourceNamed ask for parameters the name of the resource, without "Resource/", now I'm a little confused, 'cause you said that it worked for long time...

mmm Woodoo and Poltergeist are not valid tecnical solutions?

2008/1/23, David Avendasora <email@hidden>:
Well,

I got it working, but I'm unsure why.

I changed it from:

URL configURL = resourceManager().pathURLForResourceNamed( "Resources/log4j.xml" , null, null);

To:

URL configURL = resourceManager().pathURLForResourceNamed( "log4j.xml", null, null);

and the first couple times I tried running it again (after a clean) it still didn't work. But then it suddenly did start working on the third try.

This is the same behavior as before. It stops working, then suddenly starts again. It had been working with "Resources/" as part of the file name for weeks, then stopped. 

This is odd and frustrating as I don't feel I found the real problem. But at least it's working.

For now.


Dave



On Jan 23, 2008, at 9:07 AM, Asa Hardcastle wrote:

Hi David,

When I am testing a class outside of the context of wo, I do it this way:

   // Properties file config
   URL configURL = new URL("file:Resources/MyFunAndExcitingLog4jConfigFileThatEveryoneWouldBeJealousOf.properties");
   PropertyConfigurator.configure(configURL);

or for xml

   // XML Based config
   URL configURL = new URL("file:Resources/MyFunAndExcitingLog4jConfigFileThatEveryoneWouldBeJealousOfInBadAssXMLFormat.xml");
   DOMConfigurator.configure(configURL);


I place this code in main() because then it will not be called when the Application uses the object, but you can also place it inside of static { }.  I imagine the same code will work in your Application constructor.

later,

asa


On Jan 23, 2008, at 8:15 AM, Daniele Corti wrote:



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
AIM: S0CR4TE5
Messenger: email@hidden

--
Computers are like air conditioners -- they stop working properly if you open
WINDOWS

-- 
What about the four lusers of the apocalypse? I nominate:
"advertising", "can't log in", "power switch" and "what backup?"
--Alistair Young _______________________________________________
Do not post admin requests to the list. They will be ignored.
Webobjects-dev mailing list      ( email@hidden







--
Daniele Corti
AIM: S0CR4TE5
Messenger: email@hidden

--
Computers are like air conditioners -- they stop working properly if you open
WINDOWS

--
What about the four lusers of the apocalypse? I nominate:
"advertising", "can't log in", "power switch" and "what backup?"
--Alistair Young 
 _______________________________________________
Do not post admin requests to the list. They will be ignored.
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    • Re: Initializing log4j is causing a NPE
      • From: David Avendasora <email@hidden>
References: 
 >Initializing log4j is causing a NPE (From: David Avendasora <email@hidden>)
 >Re: Initializing log4j is causing a NPE (From: "Daniele Corti" <email@hidden>)
 >Re: Initializing log4j is causing a NPE (From: Asa Hardcastle <email@hidden>)
 >Re: Initializing log4j is causing a NPE (From: David Avendasora <email@hidden>)

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