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问题：

当java.lang.Thread.State处于阻塞状态时，如何获取on对象监视器地址？

范麒
2023-03-14

所以我的问题是如何找到它等待的对象监视器\lock地址？
同时，如何防止对象监视器被JIT编译以使等待信息始终可用的JVM选项-xx：compileCommand？

顺便说一句，我在java-thread-dump-waiting-on-object-monitor-what-is-it-waiting-on中也发现了类似的问题，从JVM专家的回答中我知道丢失的“waiting on”信息可能是由JIT编译器造成的，该URL中的解决方案正好适合同步对象中的object.wait()，但是我的情况明显不同，因为它试图获取对象监视器，而不是等待从同步对象获取通知。

下面的信息是提到的两个线程的调用堆栈：

"catalina-exec-995" #1178 daemon prio=5 os_prio=0 tid=0x00007f6b7831f000 nid=0x15c0 waiting for monitor entry [0x00007f6b43ffc000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.util.zip.ZipFile.getEntry(ZipFile.java:308)
- locked <**0x000000065888b918**> (a java.util.jar.JarFile)
at java.util.jar.JarFile.getEntry(JarFile.java:240)
at java.util.jar.JarFile.getJarEntry(JarFile.java:223)
at org.apache.catalina.webresources.AbstractSingleArchiveResourceSet.getArchiveEntry(AbstractSingleArchiveResourceSet.java:94)
at org.apache.catalina.webresources.AbstractArchiveResourceSet.getResource(AbstractArchiveResourceSet.java:260)
at org.apache.catalina.webresources.StandardRoot.getResourcesInternal(StandardRoot.java:327)
at org.apache.catalina.webresources.CachedResource.validateResources(CachedResource.java:124)
- locked <0x000000068aa3c7a0> (a org.apache.catalina.webresources.CachedResource)
at org.apache.catalina.webresources.Cache.getResources(Cache.java:147)
at org.apache.catalina.webresources.StandardRoot.getResources(StandardRoot.java:315)
at org.apache.catalina.webresources.StandardRoot.getClassLoaderResources(StandardRoot.java:231)
at org.apache.catalina.loader.WebappClassLoaderBase.findResources(WebappClassLoaderBase.java:939)
at java.lang.ClassLoader.getResources(ClassLoader.java:1142)
at com.sun.jersey.spi.service.ServiceFinder.getResources(ServiceFinder.java:352)
at com.sun.jersey.spi.service.ServiceFinder.access$200(ServiceFinder.java:159)
at com.sun.jersey.spi.service.ServiceFinder$AbstractLazyIterator.setConfigs(ServiceFinder.java:720)
at com.sun.jersey.spi.service.ServiceFinder$AbstractLazyIterator.hasNext(ServiceFinder.java:732)
at com.sun.jersey.spi.service.ServiceFinder.toClassArray(ServiceFinder.java:595)
at com.sun.jersey.core.spi.component.ProviderServices.getServiceClasses(ProviderServices.java:318)
at com.sun.jersey.core.spi.component.ProviderServices.getServiceClasses(ProviderServices.java:311)
at com.sun.jersey.core.spi.component.ProviderServices.getServices(ProviderServices.java:159)
at com.sun.jersey.core.spi.factory.MessageBodyFactory.initWriters(MessageBodyFactory.java:207)
at com.sun.jersey.core.spi.factory.MessageBodyFactory.init(MessageBodyFactory.java:163)
at com.sun.jersey.api.client.Client.init(Client.java:342)
at com.sun.jersey.api.client.Client.access$000(Client.java:118)
at com.sun.jersey.api.client.Client$1.f(Client.java:191)
at com.sun.jersey.api.client.Client$1.f(Client.java:187)
at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193)
at com.sun.jersey.api.client.Client.<init>(Client.java:187)
at com.sun.jersey.api.client.Client.<init>(Client.java:170)
at com.sun.jersey.api.client.Client.create(Client.java:679)
at com.meritdata.tempo.foundation.security.util.RestfulUtils.request(RestfulUtils.java:33)
at com.meritdata.tempo.foundation.security.util.RestfulUtils.requestGet(RestfulUtils.java:28)
at com.meritdata.tempo.foundation.security.util.PaWebUtils.validatePaToken(PaWebUtils.java:344)
at com.meritdata.tempo.foundation.security.sso.PaSSO.readUserToken(PaSSO.java:137)
at com.meritdata.tempo.foundation.security.filter.UserLoginFilter.validatePortalLogin(UserLoginFilter.java:190)
at com.meritdata.tempo.foundation.security.filter.UserLoginFilter.onAccessDenied(UserLoginFilter.java:248)
at org.apache.shiro.web.filter.AccessControlFilter.onAccessDenied(AccessControlFilter.java:133)
at org.apache.shiro.web.filter.AccessControlFilter.onPreHandle(AccessControlFilter.java:162)
at org.apache.shiro.web.filter.PathMatchingFilter.isFilterChainContinued(PathMatchingFilter.java:203)
at org.apache.shiro.web.filter.PathMatchingFilter.preHandle(PathMatchingFilter.java:178)
at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:131)
at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)
at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.meritdata.tempo.foundation.security.filter.XssFilter.doFilter(XssFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.meritdata.tempo.foundation.security.filter.CacheControlFilter.doFilter(CacheControlFilter.java:41)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.orm.hibernate4.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:152)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
- locked <0x0000000612c3a940> (a org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Locked ownable synchronizers:
- <0x000000062d3e9728> (a java.util.concurrent.ThreadPoolExecutor$Worker)


"catalina-exec-998" #1181 daemon prio=5 os_prio=0 tid=0x00007f6b7c359800 nid=0x15c3 waiting for monitor entry [0x00007f6b43cf9000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.util.zip.ZipFile.getEntry(ZipFile.java:308)
- waiting to lock <**0x000000065888b918**> (a java.util.jar.JarFile)
at java.util.jar.JarFile.getEntry(JarFile.java:240)
at java.util.jar.JarFile.getJarEntry(JarFile.java:223)
at org.apache.catalina.webresources.AbstractSingleArchiveResourceSet.getArchiveEntry(AbstractSingleArchiveResourceSet.java:94)
at org.apache.catalina.webresources.AbstractArchiveResourceSet.getResource(AbstractArchiveResourceSet.java:260)
at org.apache.catalina.webresources.StandardRoot.getResourcesInternal(StandardRoot.java:327)
at org.apache.catalina.webresources.CachedResource.validateResources(CachedResource.java:124)
- locked <0x0000000691ae3b90> (a org.apache.catalina.webresources.CachedResource)
at org.apache.catalina.webresources.Cache.getResources(Cache.java:147)
at org.apache.catalina.webresources.StandardRoot.getResources(StandardRoot.java:315)
at org.apache.catalina.webresources.StandardRoot.getClassLoaderResources(StandardRoot.java:231)
at org.apache.catalina.loader.WebappClassLoaderBase.findResources(WebappClassLoaderBase.java:939)
at java.lang.ClassLoader.getResources(ClassLoader.java:1142)
at com.sun.jersey.spi.service.ServiceFinder.getResources(ServiceFinder.java:352)
at com.sun.jersey.spi.service.ServiceFinder.access$200(ServiceFinder.java:159)
at com.sun.jersey.spi.service.ServiceFinder$AbstractLazyIterator.setConfigs(ServiceFinder.java:720)
at com.sun.jersey.spi.service.ServiceFinder$AbstractLazyIterator.hasNext(ServiceFinder.java:732)
at com.sun.jersey.spi.service.ServiceFinder.toClassArray(ServiceFinder.java:595)
at com.sun.jersey.core.spi.component.ProviderServices.getServiceClasses(ProviderServices.java:318)
at com.sun.jersey.core.spi.component.ProviderServices.getServiceClasses(ProviderServices.java:311)
at com.sun.jersey.core.spi.component.ProviderServices.getServices(ProviderServices.java:159)
at com.sun.jersey.core.spi.factory.MessageBodyFactory.initWriters(MessageBodyFactory.java:207)
at com.sun.jersey.core.spi.factory.MessageBodyFactory.init(MessageBodyFactory.java:163)
at com.sun.jersey.api.client.Client.init(Client.java:342)
at com.sun.jersey.api.client.Client.access$000(Client.java:118)
at com.sun.jersey.api.client.Client$1.f(Client.java:191)
at com.sun.jersey.api.client.Client$1.f(Client.java:187)
at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193)
at com.sun.jersey.api.client.Client.<init>(Client.java:187)
at com.sun.jersey.api.client.Client.<init>(Client.java:170)
at com.sun.jersey.api.client.Client.create(Client.java:679)
at com.meritdata.tempo.foundation.security.util.RestfulUtils.request(RestfulUtils.java:33)
at com.meritdata.tempo.foundation.security.util.RestfulUtils.requestGet(RestfulUtils.java:28)
at com.meritdata.tempo.foundation.security.util.PaWebUtils.validatePaToken(PaWebUtils.java:344)
at com.meritdata.tempo.foundation.security.filter.UserLoginFilter.keepPaTokenInCookie(UserLoginFilter.java:496)
at com.meritdata.tempo.foundation.security.filter.UserLoginFilter.isAccessAllowed(UserLoginFilter.java:448)
at org.apache.shiro.web.filter.AccessControlFilter.onPreHandle(AccessControlFilter.java:162)
at org.apache.shiro.web.filter.PathMatchingFilter.isFilterChainContinued(PathMatchingFilter.java:203)
at org.apache.shiro.web.filter.PathMatchingFilter.preHandle(PathMatchingFilter.java:178)
at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:131)
at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)
at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.meritdata.tempo.foundation.security.filter.XssFilter.doFilter(XssFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.meritdata.tempo.foundation.security.filter.CacheControlFilter.doFilter(CacheControlFilter.java:41)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.orm.hibernate4.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:152)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
- locked <0x0000000612c9dee0> (a org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Locked ownable synchronizers:
- <0x000000062ca8ffc8> (a java.util.concurrent.ThreadPoolExecutor$Worker)

共有1个答案

邓开济
2023-03-14

在您的示例中，catalina-exec-995和catalina-exec-998线程竞争同一个对象监视器-地址为0x000000065888B918的JARFILE实例。stacktrace已经拥有所有信息。

两个线程都处于blocked状态，而其中一个线程处于等待锁定监视器，另一个线程处于locked监视器。这是绝对正常的情况：获取对象监视器和切换线程状态并不是原子式发生的。

等待进入对象监视器的线程首先获取锁，然后从blocked切换到runnable状态。当您在两者之间进行线程转储时，您可能会准确地捕捉到您所看到的情况。

让我用一个简单的例子来演示这一点。

public class Sync implements Runnable {
    int n;

    public static void main(String[] args) {
        Sync sync = new Sync();
        new Thread(sync, "Sync1").start();
        new Thread(sync, "Sync2").start();
        new Thread(sync, "Sync3").start();
    }

    public void run() {
        for (;;) {
            inc();
        }
    }

    public synchronized void inc() {
        n++;
    }
}

线程转储可能看起来像

"Sync3" #13 prio=5 os_prio=0 tid=0x000000001deab800 nid=0x25d4 runnable [0x000000001e98f000]
   java.lang.Thread.State: RUNNABLE
    at Sync.run(Sync.java:13)
    at java.lang.Thread.run(Thread.java:748)

"Sync2" #12 prio=5 os_prio=0 tid=0x000000001deab000 nid=0x230c waiting for monitor entry [0x000000001e88f000]
   java.lang.Thread.State: BLOCKED (on object monitor)
    at Sync.inc(Sync.java:18)
    - locked <0x000000076b8a1108> (a Sync)
    at Sync.run(Sync.java:13)
    at java.lang.Thread.run(Thread.java:748)

"Sync1" #11 prio=5 os_prio=0 tid=0x000000001deaa000 nid=0x16d4 waiting for monitor entry [0x000000001e78f000]
   java.lang.Thread.State: BLOCKED (on object monitor)
    at Sync.inc(Sync.java:18)
    - waiting to lock <0x000000076b8a1108> (a Sync)
    at Sync.run(Sync.java:13)
    at java.lang.Thread.run(Thread.java:748)

显然，只有一个对象监视器-sync的单个实例。sync1和sync2线程都是阻塞的，但其中一个线程是等待锁定，另一个线程已锁定监视器。

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