My Oracle Support Banner

After installing J2EE agent 2.2 on Tomcat 5.5, the Tomcat server will not start "NoClassDefFoundError" (Doc ID 1209663.1)

Last updated on FEBRUARY 03, 2019

Applies to:

Oracle OpenSSO - Version: 7.0 to 8.0.2 - Release: 7.0 to 8.0
Information in this document applies to any platform.


Tomcat's catalina log will report the following when Tomcat will not start after installation of the J2EE agent on Tomcat:

org.apache.tomcat.util.digester.Digester startElement
SEVERE: Begin event threw error
java.lang.NoClassDefFoundError: org/apache/commons/modeler/BaseModelMBean
at java.lang.ClassLoader.defineClass1(Native Method)

The stack trace continues, but the key identifier of this problem is the "NoClassDefFoundError" line.


  Install J2EE agent for Tomcat 5.5


To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!

In this Document

My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.