Precompilation fails when preparing WAR file for WebLogic

We using the weblogic.war target in the ANT script to generate a WAR file. But we are facing JSP precompilation issues and it seems like the precompilation of JSPs is failing because of the following error:

weblogic.precompile:
[echo] Precompiling JSPs (use -Dskip.precompile=true to skip)...
[java] Error: [jspc]: 1 file(s) failed:
[java] /500page.jsp
[java] Exception in thread "main"
[java] [Compilation errors : ]

[java] /export/vol01/enterprise-docs/jira/weblogic/src/jira/build/jira/tmp/build/weblogic/WEB-INF/classes/jsp_servlet/__500page.java:1602: cannot resolve symbol
[java] symbol : variable level
[java] location: class org.apache.log4j.spi.LoggingEvent
[java] out.print(String.valueOf( loggingEvent.level )); //[ /500page.jsp; Line: 280]
[java] ^
[java] 1 error

[java] at weblogic.jspc.doCompile(jspc.java:861)
[java] at weblogic.jspc.runJspc(jspc.java:654)
[java] at weblogic.jspc.runBodyInternal(jspc.java:412)
[java] at weblogic.jspc.runBody(jspc.java:319)
[java] at weblogic.utils.compiler.Tool.run(Tool.java:192)
[java] at weblogic.utils.compiler.Tool.run(Tool.java:147)
[java] at weblogic.jspc.main(jspc.java:730)

[java] java.lang.Exception: [Compilation errors : ]

[java] /export/vol01/enterprise-docs/jira/weblogic/src/jira/build/jira/tmp/build/weblogic/WEB-INF/classes/jsp_servlet/__500page.java:1602: cannot resolve symbol
[java] symbol : variable level
[java] location: class org.apache.log4j.spi.LoggingEvent
[java] out.print(String.valueOf( loggingEvent.level )); //[ /500page.jsp; Line: 280]
[java] ^
[java] 1 error

[java] at weblogic.jspc.doCompile(jspc.java:864)
[java] at weblogic.jspc.runJspc(jspc.java:654)
[java] at weblogic.jspc.runBodyInternal(jspc.java:412)
[java] at weblogic.jspc.runBody(jspc.java:319)
[java] at weblogic.utils.compiler.Tool.run(Tool.java:192)
[java] at weblogic.utils.compiler.Tool.run(Tool.java:147)
[java] at weblogic.jspc.main(jspc.java:730)

[java] Java Result: 1