JspC exception with log4j in WEB-INF/lib

[Artur Brinkmann]

I'm trying to use the Jspc ant task to precompile JSP pages. It's almost 
working except for one problem. I made a minimal webapp, with the usual 
structure, and just one empty JSP file. The task runs fine and compiles the 
JSP without problems.

But as soon as I put log4j-1.2.9.jar into my WEB-INF/lib directory, it 
doesn't work any more. I get the following exception:

 [jasper2] java.lang.NullPointerException
 [jasper2]     at 
org.apache.jasper.JspCompilationContext.createCompiler(JspCompilationContext.java:220)
 [jasper2]     at org.apache.jasper.JspC.processFile(JspC.java:849)
 [jasper2]     at org.apache.jasper.JspC.execute(JspC.java:991)
 [jasper2]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native 
Method)
 [jasper2]     at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 [jasper2]     at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 [jasper2]     at java.lang.reflect.Method.invoke(Method.java:585)
 [jasper2]     at 
org.apache.tools.ant.TaskAdapter.execute(TaskAdapter.java:157)
 [jasper2]     at 
org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:306)
 [jasper2]     at org.apache.tools.ant.Task.perform(Task.java:401)
 [jasper2]     at org.apache.tools.ant.Target.execute(Target.java:338)
 [jasper2]     at org.apache.tools.ant.Target.performTasks(Target.java:365)
 [jasper2]     at 
org.apache.tools.ant.Project.executeTarget(Project.java:1237)
 [jasper2]     at 
org.apache.tools.ant.Project.executeTargets(Project.java:1094)
 [jasper2]     at org.apache.tools.ant.Main.runBuild(Main.java:669)
 [jasper2]     at org.apache.tools.ant.Main.startAnt(Main.java:220)
 [jasper2]     at 
org.apache.tools.ant.launch.Launcher.run(Launcher.java:215)
 [jasper2]     at 
org.apache.tools.ant.launch.Launcher.main(Launcher.java:90)
 [jasper2] Error in class org.apache.jasper.JspC

I tried different versions of log4j, without success. Any other jar files 
don't bother Jspc, but as soon as I put log4j in WEB-INF/lib, I get this 
exception.

The funny thing is, WEB-INF/lib isn't even in the classpath of the JspC 
task. And if I put log4j in ${tomcat.home}/common/lib (which is in the 
classpath), I don't get the exception.

Well, I can't figure it out... anybody know why this could be happening?

Thanks. 


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