Tuning JVM parameters to avoid java.lang.OutOfMemoryError: PermGen space

I'm getting an error " java.lang.OutOfMemoryError: PermGen space " very often (1-2 times per week) and I cannot localize the problem.

Thread dump shows no blocked processes. And a heap dump cannot be done when this error occurs (even when parameter Heap dump on OOME: enabled ). I've tried many options when restart the JVM but nothing helps. Maybe somebody knows what can be a problem seeing this screenshots from Java VisualVM?

Tomcat 6, Java 1.6.

Overview JVM parameters:

Monitor:

Monitor (PermGen):

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