Question

I’m trying to diagnose a java.lang.OutOfMemoryError: PermGen Space error when running on Sun’s Hotspot JVM, and would like to know how much PermGen space my program is using at various points. Is there a way of finding out this information programmatically?

Answer 1

You can use something like this:

Iterator<MemoryPoolMXBean> iter = ManagementFactory.getMemoryPoolMXBeans().iterator(); while (iter.hasNext()) {     MemoryPoolMXBean item = iter.next();     String name = item.getName();     MemoryType type = item.getType();     MemoryUsage usage = item.getUsage();     MemoryUsage peak = item.getPeakUsage();     MemoryUsage collections = item.getCollectionUsage(); } 

This will give you all types of memory. You are interested in ‘Perm Gen’ type.