Getting "Error 500--Internal Server Error" for Enterprise Manager

Question

Hi,
I'm getting "Error 500--Internal Server Error" while invoking EM of wls server ie http://<host>:7001/em/ It used to work fine before. Restored config.xml from domain_bak, but still error persists. I can see following error in AdminServer logs while invoking above URL:
Caused By: java.lang.ClassNotFoundException: oracle.binding.DataControl
        at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
Copied adfm.jar to domain lib and bounced all wls servers, but error still persists.
Please let me know what else can be tried.
Thanks,
Vikas

Answer 1

Some more lines from stack trace:
####<Oct 10, 2013 9:52:36 PM PDT> <Notice> <Diagnostics> <slc04qvi> <AdminServer> <[ACTIVE] ExecuteThread: '2' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <f7fdeea2380fcf3a:-5d5bd989:141a5bc686c:-8000-000000000000005e> <1381467156262> <BEA-320068> <Watch 'UncheckedException' with severity 'Notice' on server 'AdminServer' has triggered at Oct 10, 2013 9:52:36 PM PDT. Notification details:
WatchRuleType: Log
WatchRule: (SEVERITY = 'Error') AND ((MSGID = 'WL-101020') OR (MSGID = 'WL-101017') OR (MSGID = 'WL-000802') OR (MSGID = 'BEA-101020') OR (MSGID = 'BEA-101017') OR (MSGID = 'BEA-000802'))
WatchData: DATE = Oct 10, 2013 9:52:36 PM PDT SERVER = AdminServer MESSAGE = [ServletContext@2095354505[app:em module:/em path:/em spec-version:2.5]] Root cause of ServletException.
java.lang.NoClassDefFoundError: oracle/binding/DataControl
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:792)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)