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javaoptimizationmemory-managementmemory-leaksconcurrenthashmap

Java Memory Leak (Loop Traversing)

My server has some kind of memory leak or something, java CPU usage jumps to 100% in an hour and after many hours, it jumps to 1100%.

I was wondering if this loop traversing may cause a memory leak.

for (Object o : friends.values()) {
    doSomethingWith(o); 
}

friends is a ConcurrentHashMap and it's content may change on some situations when a friend goes online or offline.

If this is safe, how can I find the memory leak?

Thanks in advance.

Solution

  • you can use visualvm to monitor your application while it is running.

    Create a memory dump and use Eclipse Memory Analyzer to study your dump

    You should be able to get more details with these tools