How to let Weblogic to load log4j.jar from application?

Hi all,
Our company planed to move an application from WebSphere to WebLogic server (10.0.2). I am responsible for the technique aspect on this moving. But this is my first time to work on WebLogic, so it seems everything is new for me. Currently, I am encountering a very tough issue. In our project, it has an old log4j.jar (2001). I put the jar in APP-INF/lib. However, after I deployed the project to server, system always run the new log4.jar from server, and gave exception, as follows. The old log4j.jar has this method, but new log4j.jar doesn't.
Anybody can give me help? I really appreciate. Thanks.
####<Aug 5, 2009 10:28:06 AM CDT> <Error> <HTTP> <msn043074c> <AdminServer> <[ACTIVE] ExecuteThread: '1' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1249486086015> <BEA-101017> <[weblogic.servlet.internal.WebAppServletContext@1988902 - appName: 'ampi', name: 'ampi', context-path: '/ampi'] Root cause of ServletException.
java.lang.NoSuchMethodError: org.apache.log4j.Category.getInstance(Ljava/lang/String;Lorg/apache/log4j/spi/CategoryFactory;)Lorg/apache/log4j/Category;
     at com.lilly.atlas.frameworks.logging.AtlasServerCategory.getInstance(AtlasServerCategory.java:182)
     at com.lilly.atlas.frameworks.logging.Log4JAdapter.<init>(Log4JAdapter.java:103)
     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.lilly.atlas.frameworks.logging.AtlasLogger.initialize(AtlasLogger.java:110)
     at com.lilly.atlas.frameworks.logging.AtlasLogger.<init>(AtlasLogger.java:93)
     at com.lilly.atlas.frameworks.logging.AtlasLogger.getInstance(AtlasLogger.java:129)
     at com.lilly.atlas.frameworks.logging.AtlasLogger.info(AtlasLogger.java:329)
     at com.lilly.tox.ampi.actions.LoginAction.perform(LoginAction.java:145)
     at org.apache.struts.action.ActionServlet.processActionPerform(ActionServlet.java:1786)
     at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1585)
     at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:509)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
     at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:226)
     at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:124)
     at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:283)
     at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:175)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3404)
     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
     at weblogic.security.service.SecurityManager.runAs(Unknown Source)
     at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2140)
     at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2046)
     at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1398)
     at weblogic.work.ExecuteThread.execute(ExecuteThread.java:200)
     at weblogic.work.ExecuteThread.run(ExecuteThread.java:172)

Hi David,
According to the link you posted, I put the following codes in the weblogic-application.xml, then my ear file can be successfully deployed on WebLogic. Thank you soooooo much, I sincerely appreciate it.
<wls:prefer-application-packages>
<wls:package-name>org.apache.log4j.*</wls:package-name>
</wls:prefer-application-packages>
Best regards,
Sheng
Edited by: gus888 on Aug 5, 2009 11:34 AM

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