I created an aribaweb application which is running on JBoss AS7. In JBoss AS7 uses org.jboss.logmanager.log4j.BridgeLogger class for Logger implementation (Here the BridgeLogger class extends with org.apache.log4j.Logger). I deployed an aribaweb application in JBoss AS7 server . Internally aribaweb application also uses same Log4J Implementation for logging purpose but it uses ariba.util.log.Logger class (Here the ariba Logger class extends with org.apache.log4j.Logger) for Logger implementation. But aribaweb application shows no result due to some class cast exception which is related to logger issue here follows few lines of my exception

java.lang.ExceptionInInitializerError
  at ariba.util.core.ClassUtil.classForName(ClassUtil.java:259)
  at ariba.util.core.ClassUtil.classForName(ClassUtil.java:182)
  at ariba.ui.aribaweb.util.AWClassLoader.getClass(AWClassLoader.java:49)
  at ariba.ui.aribaweb.util.AWUtil.classForName(AWUtil.java:201)
  at ariba.ui.aribaweb.core.AWConcreteApplication.createApplication(AWConcreteApplication.java:145)
  at ariba.ui.servletadaptor.MyAWDispatcherServlet.createApplication(RimsAWDispatcherServlet.java:25)
  at ariba.ui.servletadaptor.AWDispatcherServlet.init(AWDispatcherServlet.java:54)
  at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1202) [jbossweb-7.0.13.Final.jar:]
  ... 246 more
Caused by: java.lang.ClassCastException: org.jboss.logmanager.log4j.BridgeLogger cannot be cast to ariba.util.log.Logger
  at ariba.util.log.Log.(Log.java:90)

The exception happening on ariba.util.log.Log.java class with following lines

public static final Logger startup =
  (Logger)Logger.getLogger("startup");

I dont know about JBoss logging configuration. Is there is any logger in JBoss AS7 which have same name as "startup"?. or is there is any configuration to solving this?