发现一个Java级死锁：

Question

我试图显示一个类的所有方法名称。此代码在发送的os 6中运行良好，

private static void extractClassMethods(Class classObject) {     

    // read the methods
    Method[] methods = classObject.getMethods();

    // no methods
    if (methods == null) {
        return;
    }

    // print method path
    for (Method method : methods) {  
        System.out.println(method.getName()) ;
    } 
}

查找完整的例外日志，

发现一个Java级死锁：

＆＃34;螺纹-24＆＃34 ;: 等待锁定监视器0x00007fee807b66b8（对象0x00000007e060e490，一个org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader），这是由＆＃34; Thread-15＆＃34; ＆＃34;螺纹-15＆＃34 ;: 等待锁定监视器0x00007feebc0101c8（对象0x00000007e12564e8，一个java.lang.Object），这是由＆＃34; Start Level Event Dispatcher＆＃34; ＆＃34;开始级别事件调度员＆＃34;：等待锁定监视器0x00007fee807b66b8（对象0x00000007e060e490，一个org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader），由＆＃34; Thread-15＆＃34;

持有

上面列出的线程的Java堆栈信息：

＆＃34;螺纹-24＆＃34 ;: at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl（ClasspathManager.java:424） - 等待锁定＆lt; 0x00000007e060e490＆gt; （a org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader）在org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass（ClasspathManager.java:413）在org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass（DefaultClassLoader.java:189）在org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass（BundleLoader.java:340）在org.eclipse.osgi.framework.internal.core.SingleSourcePackage.loadClass（SingleSourcePackage.java:37）在org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal（BundleLoader.java:405）在org.eclipse.osgi.framework.internal.core.BundleLoader.findClass（BundleLoader.java:369）在org.eclipse.osgi.framework.internal.core.BundleLoader.findClass（BundleLoader.java:357）在org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass（DefaultClassLoader.java:83） at java.lang.ClassLoader.loadClass（ClassLoader.java:358） at java.lang.Class.getDeclaredMethods0（Native Method） at java.lang.Class.privateGetDeclaredMethods（Class.java:2531） at java.lang.Class.privateGetPublicMethods（Class.java:2651） at java.lang.Class.getMethods（Class.java:1467） at com.something.extractClassMethods（MethodAccessManager.java:102）在java.lang.Thread.run（Thread.java:744）＆＃34;螺纹-15＆＃34 ;: at com.eclipsesource.jaxrs.publisher.internal.JAXRSConnector.addResource（JAXRSConnector.java:110） - 等待锁定＆lt; 0x00000007e12564e8＆gt; （一个java.lang.Object） at com.eclipsesource.jaxrs.publisher.internal.ResourceTracker.delegateAddService（ResourceTracker.java:45） at com.eclipsesource.jaxrs.publisher.internal.ResourceTracker.addingService（ResourceTracker.java:39）在org.osgi.util.tracker.ServiceTracker $ Tracked.trackAdding（ServiceTracker.java:1064）在org.osgi.util.tracker.ServiceTracker $ Tracked.track（ServiceTracker.java:1042）在org.osgi.util.tracker.ServiceTracker $ Tracked.serviceChanged（ServiceTracker.java:975）在org.eclipse.osgi.framework.internal.core.FilteredServiceListener.serviceChanged（FilteredServiceListener.java:94）在org.eclipse.osgi.framework.internal.core.BundleContextImpl.dispatchEvent（BundleContextImpl.java:1224）在org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent（EventManager.java:195）在org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous（ListenerQueue.java:141）在org.eclipse.osgi.framework.internal.core.Framework.publishServiceEventPrivileged（Framework.java:1603）在org.eclipse.osgi.framework.internal.core.Framework.publishServiceEvent（Framework.java:1578）在org.eclipse.osgi.framework.internal.core.ServiceRegistrationImpl。（ServiceRegistrationImpl.java:103）在org.eclipse.osgi.framework.internal.core.BundleContextImpl.createServiceRegistration（BundleContextImpl.java:657）在org.eclipse.osgi.framework.internal.core.BundleContextImpl.registerService（BundleContextImpl.java:609）在org.eclipse.osgi.framework.internal.core.BundleContextImpl.registerService（BundleContextImpl.java:675）在org.eclipse.osgi.framework.internal.core.BundleContextImpl $ 2.run（BundleContextImpl.java:999） at java.security.AccessController.doPrivileged（Native Method）在org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator（BundleContextImpl.java:993）在org.eclipse.osgi.framework.internal.core.BundleContextImpl.start（BundleContextImpl.java:974）在org.eclipse.osgi.framework.internal.core.BundleHost.startWorker（BundleHost.java:346）在org.eclipse.osgi.framework.internal.core.AbstractBundle.start（AbstractBundle.java:260）在org.eclipse.osgi.framework.util.SecureAction.start（SecureAction.java:400）在org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass（EclipseLazyStarter.java:111）在org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass（ClasspathManager.java:417）在org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass（DefaultClassLoader.java:189）在org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass（BundleLoader.java:340）在org.eclipse.osgi.framework.internal.core.SingleSourcePackage.loadClass（SingleSourcePackage.java:37）在org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal（BundleLoader.java:405）在org.eclipse.osgi.framework.internal.core.BundleLoader.findClass（BundleLoader.java:369）在org.eclipse.osgi.framework.internal.core.BundleLoader.findClass（BundleLoader.java:357）在org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass（DefaultClassLoader.java:83） at java.lang.ClassLoader.loadClass（ClassLoader.java:358）在org.eclipse.osgi.framework.internal.core.BundleContextImpl $ 2.run（BundleContextImpl.java:999） at java.security.AccessController.doPrivileged（Native Method）在org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator（BundleContextImpl.java:993）在org.eclipse.osgi.framework.internal.core.BundleContextImpl.start（BundleContextImpl.java:974）在org.eclipse.osgi.framework.internal.core.BundleHost.startWorker（BundleHost.java:346）在org.eclipse.osgi.framework.internal.core.AbstractBundle.start（AbstractBundle.java:260）在org.eclipse.osgi.framework.util.SecureAction.start（SecureAction.java:400）在org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass（EclipseLazyStarter.java:111）在org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass（ClasspathManager.java:417）在org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass（DefaultClassLoader.java:189）在org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass（BundleLoader.java:340）在org.eclipse.osgi.framework.internal.core.SingleSourcePackage.loadClass（SingleSourcePackage.java:37）在org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal（BundleLoader.java:405）在org.eclipse.osgi.framework.internal.core.BundleLoader.findClass（BundleLoader.java:369）在org.eclipse.osgi.framework.internal.core.BundleLoader.findClass（BundleLoader.java:357）在org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass（DefaultClassLoader.java:83） at java.lang.ClassLoader.loadClass（ClassLoader.java:358） at java.lang.Class.getDeclaredMethods0（Native Method） at java.lang.Class.privateGetDeclaredMethods（Class.java:2531） at java.lang.Class.privateGetPublicMethods（Class.java:2651） at java.lang.Class.getMethods（Class.java:1467）在com.something.extractClassMethods（MethodAccessManager.java:102 在java.lang.Thread.run（Thread.java:744）＆＃34;开始级别事件调度员＆＃34;： at java.lang.Class.getDeclaredMethods0（Native Method） at java.lang.Class.privateGetDeclaredMethods（Class.java:2531） at java.lang.Class.getDeclaredMethods（Class.java:1855）在org.glassfish.jersey.server.model.IntrospectionModeller $ 2.run（IntrospectionModeller.java:236） at java.security.AccessController.doPrivileged（Native Method） at org.glassfish.jersey.server.model.IntrospectionModeller.getAllDeclaredMethods（IntrospectionModeller.java:230） at org.glassfish.jersey.server.model.IntrospectionModeller.checkForNonPublicMethodIssues（IntrospectionModeller.java:170）在org.glassfish.jersey.server.model.IntrospectionModeller.doCreateResourceBuilder（IntrospectionModeller.java:118） at org.glassfish.jersey.server.model.IntrospectionModeller.access $ 000（IntrospectionModeller.java:80）在org.glassfish.jersey.server.model.IntrospectionModeller $ 1.call（IntrospectionModeller.java:111）在org.glassfish.jersey.server.model.IntrospectionModeller $ 1.call（IntrospectionModeller.java:108）在org.glassfish.jersey.internal.Errors.process（Errors.java:315）在org.glassfish.jersey.internal.Errors.process（Errors.java:297）在org.glassfish.jersey.internal.Errors.processWithException（Errors.java:255）在org.glassfish.jersey.server.model.IntrospectionModeller.createResourceBuilder（IntrospectionModeller.java:108）在org.glassfish.jersey.server.model.Resource.from（Resource.java:744）在org.glassfish.jersey.server.ApplicationHandler.initialize（ApplicationHandler.java:411）在org.glassfish.jersey.server.ApplicationHandler.access $ 500（ApplicationHandler.java:163）在org.glassfish.jersey.server.ApplicationHandler $ 3.run（ApplicationHandler.java:323）在org.glassfish.jersey.internal.Errors $ 2.call（Errors.java:289）在org.glassfish.jersey.internal.Errors $ 2.call（Errors.java:286）在org.glassfish.jersey.internal.Errors.process（Errors.java:315）在org.glassfish.jersey.internal.Errors.process（Errors.java:297）在org.glassfish.jersey.internal.Errors.processWithException（Errors.java:286）在org.glassfish.jersey.server.ApplicationHandler。（ApplicationHandler.java:320）在org.glassfish.jersey.server.ApplicationHandler。（ApplicationHandler.java:285）在org.glassfish.jersey.servlet.WebComponent。（WebComponent.java:310）在org.glassfish.jersey.servlet.ServletContainer.reload（ServletContainer.java:578） at com.eclipsesource.jaxrs.publisher.internal.JerseyContext.addResource（JerseyContext.java:71） at com.eclipsesource.jaxrs.publisher.internal.JAXRSConnector.registerResource（JAXRSConnector.java:140） at com.eclipsesource.jaxrs.publisher.internal.JAXRSConnector.registerResource（JAXRSConnector.java:122） at com.eclipsesource.jaxrs.publisher.internal.JAXRSConnector.doAddResource（JAXRSConnector.java:116） at com.eclipsesource.jaxrs.publisher.internal.JAXRSConnector.addResource（JAXRSConnector.java:110） - 已锁定＆lt; 0x00000007e12564e8＆gt; （一个java.lang.Object） at com.eclipsesource.jaxrs.publisher.internal.ResourceTracker.delegateAddService（ResourceTracker.java:45） at com.eclipsesource.jaxrs.publisher.internal.ResourceTracker.addingService（ResourceTracker.java:39）在org.osgi.util.tracker.ServiceTracker $ Tracked.trackAdding（ServiceTracker.java:1064）在org.osgi.util.tracker.ServiceTracker $ Tracked.trackInitialServices（ServiceTracker.java:926）在org.osgi.util.tracker.ServiceTracker.open（ServiceTracker.java:330） - 已锁定＆lt; 0x00000007e1256ab8＆gt; （com.eclipsesource.jaxrs.publisher.internal.ResourceTracker）在org.osgi.util.tracker.ServiceTracker.open（ServiceTracker.java:274） at com.eclipsesource.jaxrs.publisher.internal.Activator.openAllServiceTracker（Activator.java:76） at com.eclipsesource.jaxrs.publisher.internal.Activator.start（Activator.java:50）在org.eclipse.osgi.framework.internal.core.BundleContextImpl $ 2.run（BundleContextImpl.java:999） at java.security.AccessController.doPrivileged（Native Method）在org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator（BundleContextImpl.java:993）在org.eclipse.osgi.framework.internal.core.BundleContextImpl.start（BundleContextImpl.java:974）在org.eclipse.osgi.framework.internal.core.BundleHost.startWorker（BundleHost.java:346）在org.eclipse.osgi.framework.internal.core.AbstractBundle.start（AbstractBundle.java:260）在org.eclipse.update.internal.configurator.ConfigurationActivator.installBundles（ConfigurationActivator.java:216）在org.eclipse.update.internal.configurator.ConfigurationActivator.start（ConfigurationActivator.java:80）在org.eclipse.osgi.framework.internal.core.BundleContextImpl $ 2.run（BundleContextImpl.java:999） at java.security.AccessController.doPrivileged（Native Method）在org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator（BundleContextImpl.java:993）在org.eclipse.osgi.framework.internal.core.BundleContextImpl.start（BundleContextImpl.java:974）在org.eclipse.osgi.framework.internal.core.BundleHost.startWorker（BundleHost.java:346）在org.eclipse.osgi.framework.internal.core.AbstractBundle.resume（AbstractBundle.java:350）在org.eclipse.osgi.framework.internal.core.Framework.resumeBundle（Framework.java:1118）在org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles（StartLevelManager.java:631）在org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL（StartLevelManager.java:505）在org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel（StartLevelManager.java:279） - 已锁定＆lt; 0x00000007e40c67c0＆gt; （一个java.lang.Object）在org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent（StartLevelManager.java:465）在org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent（EventManager.java:195）在org.eclipse.osgi.framework.eventmgr.EventManager $ EventThread.run（EventManager.java:297）

发现1死锁。

Answer 1

你的代码很好从org.eclipse.osgi.framework开始的异常堆栈还有其他问题你的代码在我身边工作得很好。

java.lang.Class.getMethods中的Java级死锁 - CentOS-7.2

发现一个Java级死锁：

上面列出的线程的Java堆栈信息：

1 个答案: