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启动时多线程Java代理死锁，锁定ClassLoader和[I？

1 周，4 日 Questions & Answers

带有两个javaagent的应用程序，陷入僵局（在执行main之前）

为什么有线程试图获取[I的锁？为什么会有死路一条

jstack的死锁输出：

Found one Java-level deadlock:
=============================
"com.taobao.diamond.client.Worker.longPullingdefault":
  waiting to lock monitor 0x00007fb6341d0ec8 (object 0x000000073e8efe20, a [I),
  which is held by "oneagent plugin Bsnt-agent start"
"oneagent plugin Bsnt-agent start":
  waiting to lock monitor 0x00007fb6940038d8 (object 0x0000000766224ec8, a com.bilibili.ntib.agent.starter.SandboxClassLoader),
  which is held by "oneagent plugin msha-java-agent start"
"oneagent plugin msha-java-agent start":
  waiting to lock monitor 0x00007fb6341d0ec8 (object 0x000000073e8efe20, a [I),
  which is held by "oneagent plugin Bsnt-agent start"

Java stack information for the threads listed above:
===================================================
"com.taobao.diamond.client.Worker.longPullingdefault":
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.util.matcher.structure.ClassStructureImplByAsm.<init>(ClassStructureImplByAsm.java:400)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.util.matcher.structure.ClassStructureFactory.createClassStructure(ClassStructureFactory.java:57)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.SandboxClassFileTransformer.getClassStructure(SandboxClassFileTransformer.java:64)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.SandboxClassFileTransformer._transform(SandboxClassFileTransformer.java:117)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.SandboxClassFileTransformer.transform(SandboxClassFileTransformer.java:84)
    at sun.instrument.TransformerManager.transform(TransformerManager.java:188)
    at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    - locked <0x00000007435e1620> (a java.lang.Object)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at com.taobao.diamond.client.impl.CacheData.safeNotifyListener(CacheData.java:145)
    at com.taobao.diamond.client.impl.CacheData.checkListenerMd5(CacheData.java:136)
    at com.taobao.diamond.client.impl.ClientWorker$LongPullingRunnable.run(ClientWorker.java:451)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
"oneagent plugin Bsnt-agent start":
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.util.matcher.structure.ClassStructureImplByAsm.<init>(ClassStructureImplByAsm.java:400)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.util.matcher.structure.ClassStructureFactory.createClassStructure(ClassStructureFactory.java:57)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.SandboxClassFileTransformer.getClassStructure(SandboxClassFileTransformer.java:64)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.SandboxClassFileTransformer._transform(SandboxClassFileTransformer.java:117)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.SandboxClassFileTransformer.transform(SandboxClassFileTransformer.java:84)
    at sun.instrument.TransformerManager.transform(TransformerManager.java:188)
    at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    - locked <0x000000073e463248> (a com.navercorp.pinpoint.common.plugin.PluginLoaderClassLoader)
    at com.navercorp.pinpoint.common.plugin.PluginLoaderClassLoader.loadClass(PluginLoaderClassLoader.java:45)
    - locked <0x000000073e463248> (a com.navercorp.pinpoint.common.plugin.PluginLoaderClassLoader)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at com.navercorp.pinpoint.plugin.jdbc.ppas.PPASPlugin.<init>(PPASPlugin.java:29)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at java.lang.Class.newInstance(Class.java:442)
    at java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:380)
    at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:404)
    at java.util.ServiceLoader$1.next(ServiceLoader.java:480)
    at com.navercorp.pinpoint.common.plugin.PluginLoader.load(PluginLoader.java:66)
    at com.navercorp.pinpoint.common.plugin.PluginLoader.load(PluginLoader.java:47)
    at com.navercorp.pinpoint.profiler.plugin.ProfilerPluginLoader.load(ProfilerPluginLoader.java:84)
    at com.navercorp.pinpoint.profiler.plugin.DefaultPluginContextLoadResult.load(DefaultPluginContextLoadResult.java:80)
    at com.navercorp.pinpoint.profiler.plugin.DefaultPluginContextLoadResult.<init>(DefaultPluginContextLoadResult.java:70)
    at com.navercorp.pinpoint.profiler.context.provider.PluginContextLoadResultProvider.get(PluginContextLoadResultProvider.java:68)
    at com.navercorp.pinpoint.profiler.context.provider.PluginContextLoadResultProvider.get(PluginContextLoadResultProvider.java:34)
    at com.google.inject.internal.ProviderInternalFactory.provision(ProviderInternalFactory.java:81)
    at com.google.inject.internal.BoundProviderFactory.provision(BoundProviderFactory.java:72)
    at com.google.inject.internal.ProviderInternalFactory.circularGet(ProviderInternalFactory.java:61)
    at com.google.inject.internal.BoundProviderFactory.get(BoundProviderFactory.java:62)
    at com.google.inject.internal.ProviderToInternalFactoryAdapter$1.call(ProviderToInternalFactoryAdapter.java:46)
    at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1092)
    at com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40)
    at com.google.inject.internal.SingletonScope$1.get(SingletonScope.java:194)
    at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:41)
    at com.google.inject.internal.InjectorImpl$2$1.call(InjectorImpl.java:1019)
    at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1092)
    at com.google.inject.internal.InjectorImpl$2.get(InjectorImpl.java:1015)
    at com.navercorp.pinpoint.profiler.context.provider.ApplicationServerTypeProvider.get(ApplicationServerTypeProvider.java:62)
    at com.navercorp.pinpoint.profiler.context.provider.ApplicationServerTypeProvider.get(ApplicationServerTypeProvider.java:36)
    at com.google.inject.internal.ProviderInternalFactory.provision(ProviderInternalFactory.java:81)
    at com.google.inject.internal.BoundProviderFactory.provision(BoundProviderFactory.java:72)
    at com.google.inject.internal.ProviderInternalFactory.circularGet(ProviderInternalFactory.java:61)
    at com.google.inject.internal.BoundProviderFactory.get(BoundProviderFactory.java:62)
    at com.google.inject.internal.ProviderToInternalFactoryAdapter$1.call(ProviderToInternalFactoryAdapter.java:46)
    at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1092)
    at com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40)
    at com.google.inject.internal.SingletonScope$1.get(SingletonScope.java:194)
    at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:41)
    at com.google.inject.internal.InternalInjectorCreator$1.call(InternalInjectorCreator.java:205)
    at com.google.inject.internal.InternalInjectorCreator$1.call(InternalInjectorCreator.java:199)
    at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1085)
    at com.google.inject.internal.InternalInjectorCreator.loadEagerSingletons(InternalInjectorCreator.java:199)
    at com.google.inject.internal.InternalInjectorCreator.injectDynamically(InternalInjectorCreator.java:180)
    at com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:110)
    at com.google.inject.Guice.createInjector(Guice.java:99)
    at com.google.inject.Guice.createInjector(Guice.java:84)
    at com.navercorp.pinpoint.profiler.context.module.DefaultApplicationContext.<init>(DefaultApplicationContext.java:145)
    at com.navercorp.pinpoint.profiler.DefaultAgent.newApplicationContext(DefaultAgent.java:127)
    at com.navercorp.pinpoint.profiler.DefaultAgent.<init>(DefaultAgent.java:107)
    at com.navercorp.pinpoint.profiler.DefaultAgent.<init>(DefaultAgent.java:70)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at com.navercorp.pinpoint.bootstrap.AgentClassLoader$2.call(AgentClassLoader.java:78)
    at com.navercorp.pinpoint.bootstrap.ContextClassLoaderExecuteTemplate.execute(ContextClassLoaderExecuteTemplate.java:42)
    at com.navercorp.pinpoint.bootstrap.AgentClassLoader.boot(AgentClassLoader.java:73)
    at com.navercorp.pinpoint.bootstrap.PinpointStarter.run(PinpointStarter.java:111)
    at com.navercorp.pinpoint.bootstrap.PinpointBootStrap.bootstrap(PinpointBootStrap.java:255)
    at com.navercorp.pinpoint.bootstrap.PinpointBootStrap.premain(PinpointBootStrap.java:40)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.alibaba.oneagent.plugin.TraditionalPlugin.start(TraditionalPlugin.java:109)
    at com.alibaba.oneagent.plugin.PluginManagerImpl.startOnePlugin(PluginManagerImpl.java:302)
    at com.alibaba.oneagent.plugin.PluginManagerImpl.access$200(PluginManagerImpl.java:31)
    at com.alibaba.oneagent.plugin.PluginManagerImpl$2.run(PluginManagerImpl.java:333)
    at java.lang.Thread.run(Thread.java:748)
"oneagent plugin msha-java-agent start":
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.util.matcher.structure.ClassStructureImplByAsm.<init>(ClassStructureImplByAsm.java:400)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.util.matcher.structure.ClassStructureFactory.createClassStructure(ClassStructureFactory.java:57)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.SandboxClassFileTransformer.getClassStructure(SandboxClassFileTransformer.java:64)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.SandboxClassFileTransformer._transform(SandboxClassFileTransformer.java:117)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.SandboxClassFileTransformer.transform(SandboxClassFileTransformer.java:84)
    at sun.instrument.TransformerManager.transform(TransformerManager.java:188)
    at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    - locked <0x000000073e0a65f8> (a java.lang.Object)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:411)
    - locked <0x0000000766224ec8> (a com.bilibili.ntib.agent.starter.SandboxClassLoader)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.classloader.RoutingURLClassLoader$1.loadClass(RoutingURLClassLoader.java:74)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.classloader.ClassLoadingLock.loadingInLock(ClassLoadingLock.java:55)
    - locked <0x000000073e0a5610> (a java.lang.Object)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.classloader.RoutingURLClassLoader.loadClass(RoutingURLClassLoader.java:63)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at com.bilibili.ntib.agent.sandbox.module.SandboxFilter.doClassFilter(SandboxFilter.java:97)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.util.matcher.ExtFilterMatcher.matchingClassStructure(ExtFilterMatcher.java:59)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.util.matcher.ExtFilterMatcher._matching(ExtFilterMatcher.java:113)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.util.matcher.ExtFilterMatcher.matching(ExtFilterMatcher.java:79)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.util.matcher.GroupMatcher$And.matching(GroupMatcher.java:52)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.DefaultCoreLoadedClassDataSource.find(DefaultCoreLoadedClassDataSource.java:106)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.DefaultCoreLoadedClassDataSource.findForReTransform(DefaultCoreLoadedClassDataSource.java:73)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.DefaultModuleEventWatcher.watch(DefaultModuleEventWatcher.java:186)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.DefaultModuleEventWatcher.watch(DefaultModuleEventWatcher.java:158)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.DefaultModuleEventWatcher.watch(DefaultModuleEventWatcher.java:150)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.util.SandboxProtector$2.invoke(SandboxProtector.java:91)
    at com.sun.proxy.$Proxy56.watch(Unknown Source)
    at com.bilibili.ntib.agent.sandbox.module.MshaSandboxModule.registerAspectPlugins(MshaSandboxModule.java:123)
    at com.bilibili.ntib.agent.sandbox.module.MshaSandboxModule.loadAspectPlugins(MshaSandboxModule.java:55)
    at com.bilibili.ntib.agent.sandbox.module.MshaSandboxModule.onActive(MshaSandboxModule.java:44)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.DefaultCoreModuleManager.callAndFireModuleLifeCycle(DefaultCoreModuleManager.java:120)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.DefaultCoreModuleManager.active(DefaultCoreModuleManager.java:433)
    - locked <0x0000000737424d18> (a com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.DefaultCoreModuleManager)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.DefaultCoreModuleManager.markActiveOnLoadIfNecessary(DefaultCoreModuleManager.java:338)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.DefaultCoreModuleManager.load(DefaultCoreModuleManager.java:193)
    - locked <0x0000000737424d18> (a com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.DefaultCoreModuleManager)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.DefaultCoreModuleManager.access$300(DefaultCoreModuleManager.java:38)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.DefaultCoreModuleManager$InnerModuleLoadCallback.onLoad(DefaultCoreModuleManager.java:580)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.ModuleJarLoader.loadingModules(ModuleJarLoader.java:93)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.ModuleJarLoader.load(ModuleJarLoader.java:129)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.ModuleLibLoader.load(ModuleLibLoader.java:77)
    at com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.DefaultCoreModuleManager.reset(DefaultCoreModuleManager.java:607)
    - locked <0x0000000737424d18> (a com.bilibili.ntib.third.com.alibaba.jvm.sandbox.core.manager.impl.DefaultCoreModuleManager)
    at com.bilibili.ntib.agent.boot.sandbox.AgentModuleManager.initManager(AgentModuleManager.java:120)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.bilibili.ntib.agent.starter.initializer.SandboxAgentInitializer.init(SandboxAgentInitializer.java:18)
    at com.bilibili.ntib.agent.starter.AgentLauncher.launch(AgentLauncher.java:53)
    at com.bilibili.ntib.agent.starter.AgentMain.premain(AgentMain.java:24)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.alibaba.oneagent.plugin.TraditionalPlugin.start(TraditionalPlugin.java:109)
    at com.alibaba.oneagent.plugin.PluginManagerImpl.startOnePlugin(PluginManagerImpl.java:302)
    at com.alibaba.oneagent.plugin.PluginManagerImpl.access$200(PluginManagerImpl.java:31)
    at com.alibaba.oneagent.plugin.PluginManagerImpl$2.run(PluginManagerImpl.java:333)
    at java.lang.Thread.run(Thread.java:748)

Found 1 deadlock.

jstack:https://pastebin.com/z1frQepX的完整输出

jstack -m:https://pastebin.com/t6aWE6K7的完整输出

一些重新实现的源代码：

class SandboxClassLoader extends URLClassLoader {

    SandboxClassLoader(final String namespace) throws Throwable {
        super(getServiceJar());
    }

    private static URL[] getServiceJar() throws IOException {
        // ...
        return urls;
    }

    @Override
    public URL getResource(String name) {
        URL url = super.getResource(name);
        return url;
    }

    @Override
    public Enumeration<URL> getResources(String name) throws IOException {
        Enumeration<URL> urls = super.getResources(name);
        return urls;
    }
}

Java版本：Java HotSpot(TM) 64-Bit Server VM; 1.8.0_172; 25.172-b11; mixed mode


共 (1) 个答案

  1. # 1 楼答案

    查看jstack输出，我们可以看到以下内容：

    1. com.taobao.diamond.client.Worker.longPullingdefault的调用堆栈：

      • ClassStructureImplByAsm.<init>(ClassStructureImplByAsm.java:400)：<init>告诉您，在执行构造函数或初始化正在构造的对象实例时，即在为字段指定默认值时，会发生一些事情。这里的情况是后者，因为第400行为类型为LazyGet的ClassStructureImplByAsm.annotationTypeClassStructuresLazyGet赋值。更准确地说，正在创建和分配一个匿名LazyGet<List<ClassStructure>>子类的实例

      • 查找第一个调用堆栈，我们看到CacheData.safeNotifyListener尝试调用ClassLoader.loadClass。在JDK源代码中该方法的开头，您可以看到synchronized (getClassLoadingLock(name))，在getClassLoadingLock中，您可以看到默认情况下（具有非并行功能的类加载器），它只是在this上同步，即在类加载器实例上同步

    2. oneagent plugin Bsnt-agent start的调用堆栈：

      • 同样，调用堆栈的顶部是ClassStructureImplByAsm.<init>(ClassStructureImplByAsm.java:400)，就像前面一样

      • 同样，ClassLoader.loadClass被触发并在类加载器上同步，这次由PluginLoaderClassLoader.loadClass(PluginLoaderClassLoader.java:45)调用

    3. oneagent plugin msha-java-agent start的调用堆栈：

      • 同样，调用堆栈的顶部是ClassStructureImplByAsm.<init>(ClassStructureImplByAsm.java:400)，就像前面一样

      • 同样地，ClassLoader.loadClass在类加载器上被触发并同步，这次由SandboxFilter.doClassFilter(SandboxFilter.java:97)间接调用，由RoutingURLClassLoader$1.loadClass(RoutingURLClassLoader.java:74)进一步向上调用堆栈。一个SandboxClassLoader似乎也参与其中

    我不确定，但看起来死锁似乎是在ClassLoader基类内部发生的，而三个独立的线程正试图同时在其上进行同步

    也许推迟在惰性getter方法内部分配ClassStructureImplByAsm.annotationTypeClassStructuresLazyGet会有所帮助，也就是说，当第一次需要成员并且仍然null时，getter会创建匿名子类实例。否则，它只返回已分配的成员。我不知道您是否是ClassStructureImplByAsm的维护者，可以直接对其进行更改，但即使不是，您至少可以在可能为上游项目创建拉请求之前，将其分叉并在本地测试修改

    对不起，我不能说得更具体一些，因为我无法编译和运行jstack协议来重现您的问题。复制者示例项目，即MCVE，会更好