Any information about this error

Application(Java/J2ee) is using Oracle Application server 10g running in RHEL 5 OS. Any help will be appreciate

Exception Name: com.evermind.server.rmi.OrionRemoteException
Exception Message: Transaction was rolled back: java.lang.NoClassDefFoundError; nested exception is: 
    java.rmi.RemoteException: ; nested exception is: 
   开发者_运维知识库 java.lang.NoClassDefFoundError
Exception Stack Trace: com.evermind.server.rmi.OrionRemoteException: Transaction was rolled back: java.lang.NoClassDefFoundError
    at ToolFacadeRemote_StatelessSessionBeanWrapper32.getLocatorOutput(ToolFacadeRemote_StatelessSessionBeanWrapper32.java:152)

Caused by: java.lang.NoClassDefFoundError
at com.f1j.swing.JBook.<init>(DashoA8533)
at com.f1j.swing.JBook.<init>(DashoA8533)

It's a NoClassDefFoundError, as you can see from the stacktrace. This means that a class required by the application is not on the classpath.

Ensure that all the requierd classes and JARs are on the application server's classpath (possible in a WAR/EAR, or accessible via RMI's remote codepath, depending on how your application infrastructure works).

More specifically, it means a class you need during your database handling code is missing from the Java classpath (that's where you can start looking in your code base).