I have huge memory problems and two days ago i made a heap dump and got following information:

The classloader/component "org.jboss.tools.jst.web.kb" occupies 485,306,072 (76.24%) bytes. The memory is accumulated in one instance of "java.util.HashMap$Entry[]" loaded by "<system class loader>".

Keywords
java.util.HashMap$Entry[]
org.jboss.tools.jst.web.kb

It is full of HashMapentries:
key: org.eclipse.core.internal.resources.File
value: org.jboss.tools.jst.web.kb.internal.XmlContextImpl

I have the memory dump here. i can provide it if you think it is a reproducible bug or you have an idea how that can happen.