waiting on (a $Lock)Īt .tryHandlePending(Unknown Source) waiting on (a $Lock)Īt .remove(Unknown Source) : BLOCKED (on object monitor)Īt (DLDemo.java:33) Here some of the relevant portion of the thread dump is displayed. Jstack 7408ģ- Get the thread dump and analyze it. JpsĢ- Run the jstack command with the pid as argument. Where deadlock was created due to nested synchronization, then I can get the thread dump using following steps.ġ- By using jps command I can get the pid of the Java application. That pid can be obtained by running jps command. You can use jstack utility to get a thread dump by providing the pid of the JavaĪpplication. If you observe that your multi-threadedĬode is not performing as well as it was then it may be due to a deadlock and best thing is to get a thread dump
JAVA DEADLOCK WITH 1 BJECT HOW TO
How to debug a deadlock in Javaĭetecting a deadlock in Java is not easy, even logs may be of little help. Static synchronization helps in this case because the lock will be acquired at theĬlass level then. If two object instances are used two threads using two separate objects can still enter a synchronized method or block
class ThreadA implements Runnableģ- By using static synchronization in Java. Calling one synchronized method from another where methods are not using the same object to synchronize.įirst example shows the scenario when there are nested synchronized blocks with reverse ordering of objects.Nested synchronized blocks with reverse ordering of objects.Scenarios when deadlock may happen are as follows. You may get deadlock in Java because of the improper use of the synchronized keyword.
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