在项目构建期间，maven挂起了20分钟(用于正常工作)

Question

构建这个maven项目过去工作了很长一段时间(6个月)，但是今天在执行mvn clean install时，构建开始每一次挂起(用不同版本的mvn尝试，包括最新的3.5.0，针对openJDK和Oracle结果都是一样的)

kill -3 PID输出

"resolver-5" #491 daemon prio=5 os_prio=0 tid=0x00007f6da8bd3800 nid=0x16b3 waiting on condition [0x00007f6d68df3000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x00000006c658c4a8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
    at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

"resolver-4" #490 daemon prio=5 os_prio=0 tid=0x00007f6da8bd2800 nid=0x16b2 waiting on condition [0x00007f6d69945000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x00000006c658c4a8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
    at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

"resolver-3" #489 daemon prio=5 os_prio=0 tid=0x00007f6da8bd9000 nid=0x16b1 waiting on condition [0x00007f6de97bc000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x00000006c658c4a8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
    at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

"resolver-2" #488 daemon prio=5 os_prio=0 tid=0x00007f6da8bd8800 nid=0x16b0 waiting on condition [0x00007f6de940e000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x00000006c658c4a8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
    at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

"resolver-1" #487 daemon prio=5 os_prio=0 tid=0x00007f6da8bd7800 nid=0x16af waiting on condition [0x00007f6de930d000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x00000006c658c4a8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
    at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

"Thread-14" #34 daemon prio=5 os_prio=0 tid=0x00007f6d9c0e7800 nid=0x73cd in Object.wait() [0x00007f6de99f7000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    at org.apache.tools.ant.taskdefs.StreamPumper.waitForInput(StreamPumper.java:245)
    - locked <0x00000006cbe26170> (a org.apache.tools.ant.taskdefs.StreamPumper)
    at org.apache.tools.ant.taskdefs.StreamPumper.run(StreamPumper.java:125)
    at java.lang.Thread.run(Thread.java:745)

"Thread-13" #33 daemon prio=5 os_prio=0 tid=0x00007f6d9c10a800 nid=0x73cb in Object.wait() [0x00007f6de9af8000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    at org.apache.tools.ant.taskdefs.StreamPumper.waitForInput(StreamPumper.java:245)
    - locked <0x00000006cbe4a7d8> (a org.apache.tools.ant.taskdefs.StreamPumper)
    at org.apache.tools.ant.taskdefs.StreamPumper.run(StreamPumper.java:125)
    at java.lang.Thread.run(Thread.java:745)

"BuilderThread 3" #19 prio=5 os_prio=0 tid=0x00007f6e00927800 nid=0x7373 waiting on condition [0x00007f6dea27d000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x00000006c6284f48> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
    at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

"BuilderThread 2" #18 prio=5 os_prio=0 tid=0x00007f6e00926800 nid=0x7372 in Object.wait() [0x00007f6dea49b000]
   java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    - waiting on <0x00000006cb6c4780> (a java.lang.UNIXProcess)
    at java.lang.Object.wait(Object.java:502)
    at java.lang.UNIXProcess.waitFor(UNIXProcess.java:395)
    - locked <0x00000006cb6c4780> (a java.lang.UNIXProcess)
    at org.apache.tools.ant.taskdefs.Execute.waitFor(Execute.java:534)
    at org.apache.tools.ant.taskdefs.Execute.execute(Execute.java:463)
    at org.apache.tools.ant.taskdefs.ExecTask.runExecute(ExecTask.java:628)
    at org.apache.tools.ant.taskdefs.ExecTask.runExec(ExecTask.java:669)
    at org.apache.tools.ant.taskdefs.ExecTask.execute(ExecTask.java:495)
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
    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 org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
    at org.apache.tools.ant.Task.perform(Task.java:348)
    at org.apache.tools.ant.Target.execute(Target.java:435)
    at org.apache.tools.ant.Target.performTasks(Target.java:456)
    at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1393)
    at org.apache.tools.ant.Project.executeTarget(Project.java:1364)
    at org.apache.maven.plugin.antrun.AntRunMojo.execute(AntRunMojo.java:313)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:154)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:146)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:200)
    at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:196)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

"BuilderThread 1" #17 prio=5 os_prio=0 tid=0x00007f6e00926000 nid=0x7371 waiting on condition [0x00007f6dea39b000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x00000006c6284f48> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
    at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

"process reaper" #12 daemon prio=10 os_prio=0 tid=0x00007f6db02a8800 nid=0x7369 runnable [0x00007f6dea4d5000]
   java.lang.Thread.State: RUNNABLE
    at java.lang.UNIXProcess.waitForProcessExit(Native Method)
    at java.lang.UNIXProcess.lambda$initStreams$3(UNIXProcess.java:289)
    at java.lang.UNIXProcess$$Lambda$7/747506922.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

"BuilderThread 0" #10 prio=5 os_prio=0 tid=0x00007f6e008d4800 nid=0x7367 waiting on condition [0x00007f6dea803000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x00000006c6284f48> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
    at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

"Service Thread" #8 daemon prio=9 os_prio=0 tid=0x00007f6e000c2800 nid=0x7355 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C1 CompilerThread2" #7 daemon prio=9 os_prio=0 tid=0x00007f6e000b3000 nid=0x7354 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C2 CompilerThread1" #6 daemon prio=9 os_prio=0 tid=0x00007f6e000b1800 nid=0x7353 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C2 CompilerThread0" #5 daemon prio=9 os_prio=0 tid=0x00007f6e000ae800 nid=0x7352 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Signal Dispatcher" #4 daemon prio=9 os_prio=0 tid=0x00007f6e000ac800 nid=0x7351 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Finalizer" #3 daemon prio=8 os_prio=0 tid=0x00007f6e00084000 nid=0x7350 in Object.wait() [0x00007f6df05f4000]
   java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
    - locked <0x00000006c231e5c8> (a java.lang.ref.ReferenceQueue$Lock)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)
    at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)

"Reference Handler" #2 daemon prio=10 os_prio=0 tid=0x00007f6e0007f800 nid=0x734f in Object.wait() [0x00007f6df06f5000]
   java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    at java.lang.Object.wait(Object.java:502)
    at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
    - locked <0x00000006c2dd4ae0> (a java.lang.ref.Reference$Lock)
    at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)

"main" #1 prio=5 os_prio=0 tid=0x00007f6e0000a800 nid=0x7349 waiting on condition [0x00007f6e0a5e2000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x00000006c6280d98> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
    at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
    at java.util.concurrent.ExecutorCompletionService.take(ExecutorCompletionService.java:193)
    at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder.multiThreadedProjectTaskSegmentBuild(MultiThreadedBuilder.java:140)
    at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder.build(MultiThreadedBuilder.java:101)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:309)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:194)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:107)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:993)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:345)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:191)
    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 org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)

"VM Thread" os_prio=0 tid=0x00007f6e00077800 nid=0x734e runnable 

"GC task thread#0 (ParallelGC)" os_prio=0 tid=0x00007f6e0001f800 nid=0x734a runnable 

"GC task thread#1 (ParallelGC)" os_prio=0 tid=0x00007f6e00021000 nid=0x734b runnable 

"GC task thread#2 (ParallelGC)" os_prio=0 tid=0x00007f6e00023000 nid=0x734c runnable 

"GC task thread#3 (ParallelGC)" os_prio=0 tid=0x00007f6e00024800 nid=0x734d runnable 

"VM Periodic Task Thread" os_prio=0 tid=0x00007f6e000c5000 nid=0x7356 waiting on condition 

JNI global references: 280

Heap
 PSYoungGen      total 1161728K, used 704160K [0x000000076ab00000, 0x00000007c0000000, 0x00000007c0000000)
  eden space 979968K, 53% used [0x000000076ab00000,0x000000078a929980,0x00000007a6800000)
  from space 181760K, 99% used [0x00000007b4e80000,0x00000007bfffe8f0,0x00000007c0000000)
  to   space 208896K, 0% used [0x00000007a6800000,0x00000007a6800000,0x00000007b3400000)
 ParOldGen       total 1211904K, used 320544K [0x00000006c0000000, 0x0000000709f80000, 0x000000076ab00000)
  object space 1211904K, 26% used [0x00000006c0000000,0x00000006d3908220,0x0000000709f80000)
 Metaspace       used 92817K, capacity 96210K, committed 96512K, reserved 1134592K
  class space    used 10910K, capacity 11975K, committed 12032K, reserved 1048576K

是什么奇怪的僵局问题吗？提前感谢！

更新实际上构建不会永远挂起(只需20-25分钟)。但是还不清楚原因是什么。

Answer 1

Maven 3.5.x有一些非常可怕的bug，即：

• 元数据下载挂起存储库，具有缓存生存期。
• Maven依赖项解析锁定

具体发生的情况是，如果您正在构建一个带有子模块或多个项目的项目，则在下载重复依赖项时，Maven 3.5.x会偶尔锁定。示例：让Spring-Expression4.3.5.RELEASE是两个或多个项目POMs的依赖项。它通过".m2\repository\org\springframework\spring-expression\4.3.5.RELEASE\spring-expression-4.3.5.RELEASE.jar“的项目1(当然，带有POM和校验和文件)下载到Maven Repo中。当项目2在同一个位置检查/下载相同的依赖项时，它锁定20分钟，然后在日志中下载“0B”。

直到Maven团队在3.5.x版本中解决了这个问题，我们才回到Maven 3.3.9，问题就消失了。(注:在我们的项目中，在解决依赖关系的同一点上，这是经常可重复的。)

Answer 2

我在Ubuntu (21.10)上下载挂起的文件时遇到了maven问题，有以下所有版本：

• 3.3.9
• 3.6.3
• 3.8.4

Maven在从工件服务器下载依赖项时挂起。如果你真的去.m2/存储库/.您将看到有一个.lock文件，工件是一个0大小的部件文件。Maven似乎给自己带来了一个死锁。

我尝试使用一个线程：

mvn -T 1 clean verify

帮不上什么忙。我还尝试将这个添加到我的~/..mavenrc中：

-Dmaven.artifact.threads=1

也无济于事。

解决这个问题的方法似乎是删除挂起的dependency.Either上的锁文件，方法是转到依赖目录或m2存储库中，如下所示：

cd ~/
rm -rf .m2/repository/**.lock

Answer 3

您可以尝试使用https://github.com/jcgay/maven-profiler来分析构建过程。也许这是特定插件中的一个问题，例如，肯定要花20分钟时间，因为有人用Thread.sleep(1200000);进行了测试。