JVM 线程BLOCK阻塞实例

最新推荐文章于 2025-06-26 17:47:21 发布

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最新推荐文章于 2025-06-26 17:47:21 发布

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本文链接：https://blog.youkuaiyun.com/wh0426/article/details/51017283

本文分析了Java应用中出现的线程阻塞问题，详细解释了一个线程因等待对象锁而进入阻塞状态的情况，并提供了具体的代码路径及锁定对象信息。

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"Thread-2" prio=10 tid=0x000000000d779000 nid=0x4268 waiting for monitor entry [0x00000000415b7000]
java.lang.Thread.State: BLOCKED (on object monitor)
at sun.nio.ch.SelectorImpl.register(SelectorImpl.java:133)
- waiting to lock <0x000000075a6faf18> (a java.util.Collections$UnmodifiableSet)------------------------------------------------1处
at java.nio.channels.spi.AbstractSelectableChannel.register(AbstractSelectableChannel.java:209)
- locked <0x000000075bb739f0> (a java.lang.Object)
- locked <0x000000075bb73a00> (a java.lang.Object)
at com.tydic.ic.sub.MultiTCPClient$2.run(MultiTCPClient.java:253)
at java.lang.Thread.run(Thread.java:745)

Locked ownable synchronizers:
- None

"Thread-1" prio=10 tid=0x00002aaac8184800 nid=0x4267 runnable [0x00000000401c8000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
- locked <0x000000075a6faf98> (a sun.nio.ch.Util$2) --------------------------------2处
- locked <0x000000075a6faf18> (a java.util.Collections$UnmodifiableSet)
- locked <0x000000075a6fab60> (a sun.nio.ch.EPollSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:102)
at ch.dermitza.securenio.AbstractSelector.run(AbstractSelector.java:379)

at java.lang.Thread.run(Thread.java:745)

根据jvm线程dump分析日志中，有 java.lang.Thread.State: BLOCKED (on object monitor)标识部分，为Jvm阻塞问题。其原因是”2处“锁住了0x000000075a6faf98对象。“1处”等待0x000000075a6faf98对象