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I'm writing an end-to-end test that my Java program releases all of its resources - threads, server sockets, client sockets. It's a library, so releasing resources by exiting the JVM is not an option. Testing the releasing of threads was easy, because you can ask a ThreadGroup for all threads in it, but I haven't yet found a good way to get a list of all network sockets that the current JVM is using. Is there some way to get from a JVM the list of all client and server sockets, similar to netstat? I'm using Netty with OIO (i.e. java.net.ServerSocket and java.net.Socket ) on Java 7. The solution needs to work on both Windows and Linux. My first preference would be to ask it from the JVM using pure Java. I tried to look for an MX Bean or similar, but did not find any. Another option might be to connect to the JVM's profiling/debugging APIs and ask for all instances of Socket and ServerSocket, but I don't know how to do that and whether it can be done without native code (AFAIK, JVMTI is native-only). Also, it shouldn't make the tests slow (even my slowest end-to-end test is just 0.5 seconds, which includes starting another JVM process). If interrogating the JVM doesn't work, a third option

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