目前我们正在分析一个tomcat线程转储。在 tomcat 上同时运行的所有线程的单个线程转储包含以下行:
...
"soldOutJmsConsumerContainer-1" prio=10 tid=0x00007f8409c14800 nid=0x231 in Object.wait() [0x00007f8403a9f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:485)
at com.tc.object.RemoteObjectManagerImpl.waitUntilRunning(RemoteObjectManagerImpl.java:150)
at com.tc.object.RemoteObjectManagerImpl.basicRetrieve(RemoteObjectManagerImpl.java:216)
- locked <0x00007f847612c820> (a com.tc.object.RemoteObjectManagerImpl)
...
"catalina-exec-33" daemon prio=10 tid=0x0000000041bc4000 nid=0x832 in Object.wait() [0x00007f8400f73000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:485)
at com.tc.object.RemoteObjectManagerImpl.waitUntilRunning(RemoteObjectManagerImpl.java:150)
at com.tc.object.RemoteObjectManagerImpl.basicRetrieve(RemoteObjectManagerImpl.java:216)
- locked <0x00007f847612c820> (a com.tc.object.RemoteObjectManagerImpl)
...
"catalina-exec-109" daemon prio=10 tid=0x0000000041469800 nid=0x1e87 in Object.wait() [0x00007f83f84c1000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:485)
at com.tc.object.RemoteObjectManagerImpl.waitUntilRunning(RemoteObjectManagerImpl.java:150)
at com.tc.object.RemoteObjectManagerImpl.basicRetrieve(RemoteObjectManagerImpl.java:216)
- locked <0x00007f847612c820> (a com.tc.object.RemoteObjectManagerImpl)
特别是我们不明白
- locked <0x00007f847612c820> (a com.tc.object.RemoteObjectManagerImpl)
在我们的理解中,它表示当时三个线程正在对同一个监视器持有一个锁。根据我们的理解和JLS的说法,这是不可能的。
我们对线程转储的解释是否正确?