NoClassDefFoundError in SAP JVM Profiler Plugin for NWDS

Hello,

I want to use the SAP JVM Profiler (Java Profiling - SAP Netweaver Application Server Java - SCN Wiki) to find the bottlenecks in our SAP NetWeaver Portal, because after some Month it gets very slow an at the end their is an OutOfMemoryError. Some objects getting to big.

When I install the Profiler-Plugin Version 2.0.17 in Netweaver Developer Studio for SAP NetWeaver 7.3 SP07 PAT0002, I get this Error-Message

java.lang.NoClassDefFoundError: Could not initialize class com.sap.jvm.profiling.ui.widgets.vmexplorer.BoardsController

in the ErrorLog when opening the VM Explorer.

After hours, I'm out of ideas. Why is this widget missing and what can I do?

Thanks.