我们有一个作为守护进程运行的java进程(在jsvc下)。每隔几天它就停止做任何工作;输出到日志文件停止(这是相当详细的,每隔5分钟),它不消耗CPU或IO。主线程没有调用堆栈的Java线程转储? (jsvc)
在日志文件中以及syserr或sysout中都没有记录异常。最后的日志语句就在数据库提交完成之前,但数据库服务器(MySQL)上没有打开的连接并查看代码,那么应该总是会有额外的日志输出,即使它遇到了一个异常会泡起来。
我觉得最奇怪的是,在线程转储(以下含税),有一个在我们的代码没有线程在所有,主线程似乎没有任何背景责任:
"main" prio=10 tid=0x0000000000614000 nid=0x445d runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
如前所述早些时候,这是一个使用jsvc运行的守护进程,但我不知道这与它有什么关系(我可以重构代码以允许直接运行它来测试)。
对此处可能发生的事情有何建议?
谢谢... DWH
全部线程转储:
Full thread dump Java HotSpot(TM) 64-Bit Server VM (14.2-b01 mixed mode):
"MySQL Statement Cancellation Timer" daemon prio=10 tid=0x00002aaaf81b8800 nid=0x447b in Object.wait() [0x00002aaaf6a22000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00002aaab5556d50> (a java.util.TaskQueue)
at java.lang.Object.wait(Object.java:485)
at java.util.TimerThread.mainLoop(Timer.java:483)
- locked <0x00002aaab5556d50> (a java.util.TaskQueue)
at java.util.TimerThread.run(Timer.java:462)
"Low Memory Detector" daemon prio=10 tid=0x00000000006a4000 nid=0x4479 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"CompilerThread1" daemon prio=10 tid=0x00000000006a1000 nid=0x4477 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"CompilerThread0" daemon prio=10 tid=0x000000000069d000 nid=0x4476 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Signal Dispatcher" daemon prio=10 tid=0x000000000069b000 nid=0x4465 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Finalizer" daemon prio=10 tid=0x0000000000678800 nid=0x4464 in Object.wait() [0x00002aaaf61d6000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00002aaab54a1cb8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
- locked <0x00002aaab54a1cb8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)
"Reference Handler" daemon prio=10 tid=0x0000000000676800 nid=0x4463 in Object.wait() [0x00002aaaf60d5000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00002aaab54a1cf0> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:485)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)
- locked <0x00002aaab54a1cf0> (a java.lang.ref.Reference$Lock)
"main" prio=10 tid=0x0000000000614000 nid=0x445d runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"VM Thread" prio=10 tid=0x0000000000670000 nid=0x4462 runnable
"GC task thread#0 (ParallelGC)" prio=10 tid=0x000000000061e000 nid=0x445e runnable
"GC task thread#1 (ParallelGC)" prio=10 tid=0x0000000000620000 nid=0x445f runnable
"GC task thread#2 (ParallelGC)" prio=10 tid=0x0000000000622000 nid=0x4460 runnable
"GC task thread#3 (ParallelGC)" prio=10 tid=0x0000000000623800 nid=0x4461 runnable
"VM Periodic Task Thread" prio=10 tid=0x00000000006a6800 nid=0x447a waiting on condition
JNI global references: 797
Heap
PSYoungGen total 162944K, used 48388K [0x00002aaadff40000, 0x00002aaaf2ab0000, 0x00002aaaf5490000)
eden space 102784K, 47% used [0x00002aaadff40000,0x00002aaae2e81170,0x00002aaae63a0000)
from space 60160K, 0% used [0x00002aaaeb850000,0x00002aaaeb850000,0x00002aaaef310000)
to space 86720K, 0% used [0x00002aaae63a0000,0x00002aaae63a0000,0x00002aaaeb850000)
PSOldGen total 699072K, used 699072K [0x00002aaab5490000, 0x00002aaadff40000, 0x00002aaadff40000)
object space 699072K, 100% used [0x00002aaab5490000,0x00002aaadff40000,0x00002aaadff40000)
PSPermGen total 21248K, used 9252K [0x00002aaab0090000, 0x00002aaab1550000, 0x00002aaab5490000)
object space 21248K, 43% used [0x00002aaab0090000,0x00002aaab09993e8,0x00002aaab1550000)
没有*好*建议,但请注意,你的终身代是100%;可能会发生一些奇怪的GC相互作用 – kdgregory 2010-04-25 12:23:29