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dev build from Jan 4 I have a simple web module that I repeatedly redeploy to running Tomcat instance. During this the usage of permanent generation memory grow with each redeploy. Most likely some Ant task is leaking here and blocks unloading of classes from memory. The result will be OutOfMemoryError when the size of permgen reaches 64MB.
probably similar to issue 52846
Now it seems that 50MB is enough and it is not growing too much above this limit (or can be GC'ed later). I did ~100 redpeploys usualy together with some change in JSP or Java source. I will close the bug now.