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Tomcat crashes: ClassNotFound JreMemoryLeakPreventionListener

 
Greenhorn
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This is actually on Amazon's EC2 but I've asked in the forums at Amazon AWS with no result and so I thought I'd try asking here.

I have EC2 configured to give me Tomcat instances in which I want to run a java servlet inside Tomcat.

It seems that EC2, as it provisions an instance, give me Tomcat versions 6.0.16 and 6.0.18 (I believe the latest is 6.0.29). It installs 6.0.16. The Tomcat server tries to start but immediately crashes with ClassNotFound JreMemoryLeakPreventionListener

JreMemoryLeakPreventionListener is in the core catalina.jar inside tomcat 6.0.29 on my local machine but I find the class in neither of 6.0.16 nor 6.0.18.

So I wonder why 6.0.16 is even asking for JreMemoryLeakPreventionListener when the server starts up if the class is not even part of that particular distribution? And I wonder why EC2 is getting provisioned in a way that crashes immediately? Since this is all (I believe) internal to the EC2 instance provisioning it's hard for me to see how I might be causing the problem myself.
 
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