log4j missing class

[hani Ibrahim]

Dear all,
i have this exception:
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Caused by: org.apache.commons.logging.LogConfigurationException: java.lang.ClassNotFoundException: org.apache.commons.logging.impl.Log4JCategoryLog (Caused by java.lang.ClassNotFoundException: org.apache.commons.logging.impl.Log4JCategoryLog)
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:397)
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)
... 50 more
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.impl.Log4JCategoryLog
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:164)
at org.apache.commons.logging.impl.LogFactoryImpl$1.run(LogFactoryImpl.java:447)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.commons.logging.impl.LogFactoryImpl.loadClass(LogFactoryImpl.java:435)
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:376)
... 51 more
---------------------------------------------------------------------------
anyone tell me where this class and which specific version,and lib should be downloaded?Please Help

[Carol Enderlin]

Looks like commons logging problem.