![]() (native thread ID:0x111200F, native priority:0x1, native policy:UNKNOWN)Īt weblogic/jms/frontend/FEConnection.stop(FEConnection.java:671(Compiled Code))Īt weblogic/jms/frontend/FEConnection.invoke(FEConnection.java:1685(Compiled Code))Īt weblogic/messaging/dispatcher/Request.wrappedFiniteStateMachine(Request.java:961(Compiled Code))Īt weblogic/messaging/dispatcher/DispatcherImpl.syncRequest(DispatcherImpl.java:184(Compiled Code))Īt weblogic/messaging/dispatcher/DispatcherImpl.dispatchSync(DispatcherImpl.java:212(Compiled Code))Īt weblogic/jms/dispatcher/DispatcherAdapter.dispatchSync(DispatcherAdapter.java:43(Compiled Code))Īt weblogic/jms/client/JMSConnection.stop(JMSConnection.java:863(Compiled Code))Īt weblogic/jms/client/WLConnectionImpl.stop(WLConnectionImpl.java:843)Īt org/springframework/jms/connection/SingleConnectionFactory.closeConnection(SingleConnectionFactory.java:342)Īt org/springframework/jms/connection/SingleConnectionFactory.resetConnection(SingleConnectionFactory.java:296) Private final ThreadMXBean mbean = ManagementFactory.Now back to our case study, an IBM JVM Thread Dump ( javacore.xyz format) was generated which did reveal the following Java Thread deadlock condition below: 1LKDEADLOCK Deadlock detected !!!ĢLKDEADLOCKTHR Thread " ExecuteThread: '8' for queue: ' (self-tuning)'" (0x000000012CC08B00)ĤLKDEADLOCKMON sys_mon_t:0x0000000126171DF8 infl_mon_t: 0x0000000126171E38:ĢLKDEADLOCKTHR Thread " ExecuteThread: '10' for queue: ' (self-tuning)'" (0x000000012E560500)ĤLKDEADLOCKMON sys_mon_t:0x000000012884CD60 infl_mon_t: 0x000000012884CDA0: Private final DeadlockHandler deadlockHandler Void handleDeadlock(final ThreadInfo deadlockedThreads) One way to impement scheduling is through executors framework - a set of well abstracted and very easy to use multithreading classes. The idea is to encapsulate periodical checking for deadlocks into a reusable component so we can just fire and forget about it. Since the old version is kept for compatibility purposes only, I am going to use the second version. The difference is that findDeadlockedThreads can also detect deadlocks caused by owner locks (), while findMonitorDeadlockedThreads can only detect monitor locks (i.e. The method of our interest is findMonitorDeadlockedThreads, or, if you are using Java 6, findDeadlockedThreads. I recommend you to check all of the methods as there are many useful operations for monitoring the performance of your application in case you are not using an external tool. Java 5 introduced ThreadMXBean - an interface that provides various monitoring methods for threads. Detect deadlocks programmatically using ThreadMXBean class ![]() Although some statical analysis libraries exist that can help us detect the possible deadlocks, it is still necessary to be able to detect them during runtime and get some information which can help us fix the issue or alert us so we can restart our application or whatever. The reason for this is it’s not practical to test all possible interleavings of a program’s threads. To make things worse, deadlocks usually manifest in production under the heaviest load, and are very hard to spot during testing. ![]() They can be very hard to detect during development, and they usually require restart of the application in order to recover. ![]() Deadlocks are situations in which two or more actions are waiting for the others to finish, making all actions in a blocked state forever.
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