问题描述
如果java层面发生了死锁，当我们使用jstack命令的时候其实是可以将死锁的信息给dump出来的，在dump结果的最后会有类似Found one Java-level deadlock:的关键字，接着会把发生死锁的线程的堆栈及对应的同步锁给打印出来，这次碰到一个系统就发生类似的问题，不过这个dump文档里虽然提到了如下的死锁信息：
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Found one Java-level deadlock:
=============================
"worker-1-thread-121":
waiting to lock monitor 0x00007f3758209dc8 (object 0x0000000764cd2b20, a java.util.concurrent.ConcurrentHashMap),
which is held by "HSFBizProcessor-4-thread-4"
"HSFBizProcessor-4-thread-4":
waiting to lock monitor 0x00007f3758289260 (object 0x000000076073ddc8, a com.alipay.cloudengine.extensions.equinox.KernelBundleClassLoader),
which is held by "HSFBizProcessor-4-thread-5"
"HSFBizProcessor-4-thread-5":
waiting to lock monitor 0x00007f3758253420 (object 0x00000007608e6fc8, a com.alipay.cloudengine.extensions.equinox.KernelBundleClassLoader),
which is held by "HSFBizProcessor-4-thread-4"
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但是我们在堆栈里搜索对应的锁的时候并没发现，也就是上面提到的
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object 0x00000007608e6fc8 which is held by "HSFBizProcessor-4-thread-4"
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我们在HSFBizProcessor-4-thread-4这个线程的堆栈里并没有看到对应的持锁信息。
附上线程dump详情
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Found one Java-level deadlock:
=============================
"worker-1-thread-121":
waiting to lock monitor 0x00007f3758209dc8 (object 0x0000000764cd2b20, a java.util.concurrent.ConcurrentHashMap),
which is held by "HSFBizProcessor-4-thread-4"
"HSFBizProcessor-4-thread-4":
waiting to lock monitor 0x00007f3758289260 (object 0x000000076073ddc8, a com.alipay.cloudengine.extensions.equinox.KernelBundleClassLoader),
which is held by "HSFBizProcessor-4-thread-5"
"HSFBizProcessor-4-thread-5":
waiting to lock monitor 0x00007f3758253420 (object 0x00000007608e6fc8, a com.alipay.cloudengine.extensions.equinox.KernelBundleClassLoader),
which is held by "HSFBizProcessor-4-thread-4"
Java stack information for the threads listed above:
===================================================
"worker-1-thread-121":
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:180)
- waiting to lock <0x0000000764cd2b20> (a java.util.concurrent.ConcurrentHashMap)
at org.springframework.beans.factory.support.AbstractBeanFactory.isTypeMatch(AbstractBeanFactory.java:455)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:317)
......
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
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