How to diagnose a Java 8 metaspace leak?

Question

I have a J2EE application with some interesting behavior ... the heap seems to behave well, growing and shrinking with garbage collections as expected over time. There is no app

Answer 1

Do a heap dump and analyze it with Eclipse MAT. Look at the classes you have loaded. Check if there's something unexpected, especially duplicate classes. It also has a classloader explorer.

Edit: In theory you could also be that you're constantly generating proxies.