BaseClassLoader leaking memory after undeploy when using JBoss bean

If I redeploy an ear which has a JBoss bean in it after a few deployments JBoss runs out of heap.
It would appear the BaseClassloader still refers to the classes that are not longer required.

Heap dump analysis shows -

Problem Suspect 1

The classloader/component "org.jboss.classloader.spi.base.BaseClassLoader @ 0xd40c9758" occupies 333,122,512 (43.46%) bytes. The memory is accumulated in one instance of "java.util.concurrent.ConcurrentHashMap$Segment[]" loaded by "<system class loader>".

Keywords
java.util.concurrent.ConcurrentHashMap$Segment[]
org.jboss.classloader.spi.base.BaseClassLoader @ 0xd40c9758

Problem Suspect 2

One instance of "org.jboss.redeploy.calc.MyCache" loaded by "org.jboss.classloader.spi.base.BaseClassLoader @ 0xe7bf8f28" occupies 259,815,320 (33.90%) bytes. The memory is accumulated in one instance of "java.util.concurrent.ConcurrentHashMap$Segment[]" loaded by "<system class loader>".

Keywords
java.util.concurrent.ConcurrentHashMap$Segment[]
org.jboss.redeploy.calc.MyCache
org.jboss.classloader.spi.base.BaseClassLoader @ 0xe7bf8f28