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Couldn't destroy threadgroup ... IllegalThreadStateException

See original GitHub issue

Following the first maven example in Chapter1. The operation is successful with the file copy, but throws WARNING afterwards. Happened both with Maven 3.3.1 and 3.5.0 (I don’t have 3.3.3 on MacOs)

MacOs, Java8u121, Mvn3.3.1, sha a806764a96c5ae50dfc7c1259fbc684394d0d0c4

[camelinaction2/chapter1/file-copy (master)]$ mvn clean
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Camel in Action 2 :: Chapter 1 :: File Copy Example 2.0.0
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ chapter1-file-copy ---
[INFO] Deleting camelinaction2/chapter1/file-copy/target
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.331 s
[INFO] Finished at: 2017-05-05T12:59:42-07:00
[INFO] Final Memory: 9M/309M
[INFO] ------------------------------------------------------------------------

[camelinaction2/chapter1/file-copy (master)]$ mvn compile exec:java -Dexec.mainClass=camelinaction.FileCopierWithCamel
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Camel in Action 2 :: Chapter 1 :: File Copy Example 2.0.0
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-resources-plugin:2.4.3:resources (default-resources) @ chapter1-file-copy ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.6.1:compile (default-compile) @ chapter1-file-copy ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 2 source files to camelinaction2/chapter1/file-copy/target/classes
[INFO]
[INFO] --- exec-maven-plugin:1.6.0:java (default-cli) @ chapter1-file-copy ---
[ion.FileCopierWithCamel.main()] DefaultCamelContext            INFO  Apache Camel 2.19.0 (CamelContext: camel-1) is starting
[ion.FileCopierWithCamel.main()] ManagedManagementStrategy      INFO  JMX is enabled
[ion.FileCopierWithCamel.main()] DefaultTypeConverter           INFO  Loaded 192 type converters
[ion.FileCopierWithCamel.main()] DefaultRuntimeEndpointRegistry INFO  Runtime endpoint registry is in extended mode gathering usage statistics of all incoming and outgoing endpoints (cache limit: 1000)
[ion.FileCopierWithCamel.main()] DefaultCamelContext            INFO  StreamCaching is not in use. If using streams then its recommended to enable stream caching. See more details at http://camel.apache.org/stream-caching.html
[ion.FileCopierWithCamel.main()] FileEndpoint                   INFO  Endpoint is configured with noop=true so forcing endpoint to be idempotent as well
[ion.FileCopierWithCamel.main()] FileEndpoint                   INFO  Using default memory based idempotent repository with cache max size: 1000
[ion.FileCopierWithCamel.main()] DefaultCamelContext            INFO  Route: route1 started and consuming from: file://data/inbox?noop=true
[ion.FileCopierWithCamel.main()] DefaultCamelContext            INFO  Total 1 routes, of which 1 are started.
[ion.FileCopierWithCamel.main()] DefaultCamelContext            INFO  Apache Camel 2.19.0 (CamelContext: camel-1) started in 0.229 seconds
[ion.FileCopierWithCamel.main()] DefaultCamelContext            INFO  Apache Camel 2.19.0 (CamelContext: camel-1) is shutting down
[ion.FileCopierWithCamel.main()] DefaultShutdownStrategy        INFO  Starting to graceful shutdown 1 routes (timeout 300 seconds)
[el-1) thread #1 - ShutdownTask] DefaultShutdownStrategy        INFO  Route: route1 shutdown complete, was consuming from: file://data/inbox?noop=true
[ion.FileCopierWithCamel.main()] DefaultShutdownStrategy        INFO  Graceful shutdown of 1 routes completed in 0 seconds
[ion.FileCopierWithCamel.main()] DefaultCamelContext            INFO  Apache Camel 2.19.0 (CamelContext: camel-1) uptime 10.252 seconds
[ion.FileCopierWithCamel.main()] DefaultCamelContext            INFO  Apache Camel 2.19.0 (CamelContext: camel-1) is shutdown in 0.018 seconds
[WARNING] thread Thread[ForkJoinPool.commonPool-worker-2,5,camelinaction.FileCopierWithCamel] was interrupted but is still alive after waiting at least 6999msecs
[WARNING] thread Thread[ForkJoinPool.commonPool-worker-2,5,camelinaction.FileCopierWithCamel] will linger despite being asked to die via interruption
[WARNING] thread Thread[ForkJoinPool.commonPool-worker-3,5,camelinaction.FileCopierWithCamel] will linger despite being asked to die via interruption
[WARNING] thread Thread[ForkJoinPool.commonPool-worker-4,5,camelinaction.FileCopierWithCamel] will linger despite being asked to die via interruption
[WARNING] NOTE: 3 thread(s) did not finish despite being asked to  via interruption. This is not a problem with exec:java, it is a problem with the running code. Although not serious, it should be remedied.
[WARNING] Couldn't destroy threadgroup org.codehaus.mojo.exec.ExecJavaMojo$IsolatedThreadGroup[name=camelinaction.FileCopierWithCamel,maxpri=10]
java.lang.IllegalThreadStateException
	at java.lang.ThreadGroup.destroy(ThreadGroup.java:778)
	at org.codehaus.mojo.exec.ExecJavaMojo.execute(ExecJavaMojo.java:321)
	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:153)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
	at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:862)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:286)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:197)
	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)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 26.884 s
[INFO] Finished at: 2017-05-05T13:00:12-07:00
[INFO] Final Memory: 29M/316M
[INFO] ------------------------------------------------------------------------

[camelinaction2/chapter1/file-copy (master)]$ git show
commit a806764a96c5ae50dfc7c1259fbc684394d0d0c4
Merge: 3e0f8da 6cdf7c7
Author: Claus Ibsen <claus.ibsen@gmail.com>
Date:   Fri May 5 11:34:52 2017 -0400

    Merge branch '219'

[camelinaction2/chapter1/file-copy (master)]$ java -version
java version "1.8.0_121"
Java(TM) SE Runtime Environment (build 1.8.0_121-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.121-b13, mixed mode)

[camelinaction2/chapter1/file-copy (master)]$ mvn -version
Apache Maven 3.3.1 (cab6659f9874fa96462afef40fcf6bc033d58c1c; 2015-03-13T13:10:27-07:00)
Maven home: /usr/local/Cellar/maven/3.3.1/libexec
Java version: 1.8.0_121, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "10.11.6", arch: "x86_64", family: "mac"