Tomcat thread waiting on and locking the same resource

Posted by Adam Matan on Stack Overflow See other posts from Stack Overflow or by Adam Matan
Published on 2012-10-21T10:26:17Z Indexed on 2012/10/21 11:00 UTC
Read the original article Hit count: 173

Filed under:

java

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multithreading

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tomcat

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concurrency

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locks

Consider the following Java\Tomcat thread dump:

"http-0.0.0.0-4080-4" daemon prio=10 tid=0x0000000019a2b000 nid=0x360e in Object.wait() [0x0000000040b71000]
   java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    - waiting on <0x00002ab5565fe358> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)
    at java.lang.Object.wait(Object.java:485)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.await(JIoEndpoint.java:458)
    - locked <0x00002ab5565fe358> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:484)
    at java.lang.Thread.run(Thread.java:662)

Is this a deadlock? It seems that the same resource (0x00002ab5565fe358) is both locked and waited on - what does it mean?

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