This is JVM crash caused by profiling of Tomcat & Liferay. Steps to reproduce: 1) Download NetBeans 6.7 beta or VisualVM 2) Download the Liferay Tomcat bundle from http://downloads.sourceforge.net/lportal/liferay-portal-tomcat-6.0-5.1.2.zip 3) Unpack the zip file and start Tomcat 4) Wait till the tomcat is fully started 5) Try to attach to the running Tomcat using "Dynamic Attach" (either using VisualVM or NetBeans, same behavior) This bug was originally reported against NetBeans Profiler. Original report is here: http://www.netbeans.org/issues/show_bug.cgi?id=150370 JVM crashes with: Error: assert(sym != __null,"SymbolHashMap::find_entry - symbol is NULL") in constantPoolOop.cpp
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