Question

我习惯于看到如下所示的Java线程转储，这是由Sun HotSpot JVM及其衍生产品（如OpenJDK）生成的：

"main" prio=10 tid=0x00007f4020009000 nid=0x538c in Object.wait() [0x00007f402891f000]
   java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    - waiting on <0x0000000614ea64e8> (a java.lang.Object)
    at java.lang.Object.wait(Object.java:503)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.join(QueuedThreadPool.java:386)
    - locked <0x0000000614ea64e8> (a java.lang.Object)
    at org.eclipse.jetty.server.Server.join(Server.java:398)
    at org.mortbay.jetty.plugin.AbstractJettyMojo.startJetty(AbstractJettyMojo.java:531)
    at org.mortbay.jetty.plugin.AbstractJettyMojo.execute(AbstractJettyMojo.java:364)
    at org.mortbay.jetty.plugin.JettyRunMojo.execute(JettyRunMojo.java:528)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)

现在，在协助其他用户使用我的软件时，我偶尔会遇到另一种形式的线程转储：

Thread 9255: (state = BLOCKED)
 - sun.reflect.annotation.AnnotationType.getInstance(java.lang.Class) @bci=0, line=63 (Interpreted frame)
 - sun.reflect.annotation.AnnotationParser.parseAnnotation(java.nio.ByteBuffer, sun.reflect.ConstantPool, java.lang.Class, boolean) @bci=94, line=202 (Interpreted frame)
 - sun.reflect.annotation.AnnotationParser.parseAnnotations2(byte[], sun.reflect.ConstantPool, java.lang.Class) @bci=39, line=69 (Compiled frame)
 - sun.reflect.annotation.AnnotationParser.parseAnnotations(byte[], sun.reflect.ConstantPool, java.lang.Class) @bci=11, line=52 (Compiled frame)
 - java.lang.Class.initAnnotationsIfNecessary() @bci=22, line=3070 (Interpreted frame)
 - java.lang.Class.getAnnotation(java.lang.Class) @bci=13, line=3029 (Interpreted frame)
 - com.google.inject.internal.Annotations.isRetainedAtRuntime(java.lang.Class) @bci=3, line=57 (Interpreted frame)
 - com.google.inject.Key.ensureRetainedAtRuntime(java.lang.Class) @bci=1, line=362 (Interpreted frame)
 - com.google.inject.Key.strategyFor(java.lang.annotation.Annotation) @bci=15, line=339 (Interpreted frame)
 - com.google.inject.Key.get(com.google.inject.TypeLiteral, java.lang.annotation.Annotation) @bci=6, line=274 (Interpreted frame)
 - com.google.inject.assistedinject.FactoryProvider2.assistKey(java.lang.reflect.Method, com.google.inject.Key, com.google.inject.internal.Errors) @bci=14, line=522 (Interpreted frame)
 - com.google.inject.assistedinject.FactoryProvider2.<init>(com.google.inject.Key, com.google.inject.assistedinject.BindingCollector) @bci=306, line=235 (Interpreted frame)

正如您所看到的，格式完全不同，而且质量低劣。它不会报告它所持有的锁，也不会报告它正在等待的对象。

有谁知道JavaVM系列产生第二种堆栈跟踪样式？我自己从未使用过，这一直困扰着我一段时间！

Answer 1

这是使用-F选项运行时jstack（在Oracle JDK中）的输出。

Answer 2

此样式的线程转储看起来像jstack下Mac OS X实用工作的结果。这可能与Mac OS JVM实现的功能有关。

哪个JVM打印出这样的线程转储？

2 个答案: