# HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

    javax.servlet.ServletException: Error allocating a servlet instance
    	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
    	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
    	org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:874)
    	org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
    	org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
    	org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
    	org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
    	java.lang.Thread.run(Thread.java:636)

root cause

    java.lang.OutOfMemoryError: PermGen space

note The full stack trace of the root cause is available in the Apache Tomcat/5.5 logs.

### Apache Tomcat/5.5