ComponentMetadataPersister hangs with IBM JDK --------------------------------------------- Key: ISPN-7635 URL: https://issues.jboss.org/browse/ISPN-7635 Project: Infinispan Issue Type: Bug Components: Build process Affects Versions: 9.0.0.CR3 Environment: java version "1.8.0" Java(TM) SE Runtime Environment (build pxa6480sr3fp12-20160919_01(SR3 FP12)) IBM J9 VM (build 2.8, JRE 1.8.0 Linux amd64-64 Compressed References 20160915_318796 (JIT enabled, AOT enabled) J9VM - R28_Java8_SR3_20160915_0912_B318796 JIT - tr.r14.java.green_20160818_122998 GC - R28_Java8_SR3_20160915_0912_B318796_CMPRSS J9CL - 20160915_318796) JCL - 20160914_01 based on Oracle jdk8u101-b13 Reporter: Tristan Tarrant Assignee: Tristan Tarrant Fix For: 9.0.0.CR4, 9.0.0.Final When building with IBM JDK, the ComponentMetadataPersister hangs when generating infinispan-core's metadata: [08:24:58]W: [Step 1/2] [WARNING] Couldn't destroy threadgroup org.codehaus.mojo.exec.ExecJavaMojo$IsolatedThreadGroup[name=org.infinispan.factories.components.ComponentMetadataPersister,maxpri=10] [08:24:58] : [Step 1/2] java.lang.IllegalThreadStateException: Has threads [08:24:58] : [Step 1/2] at java.lang.ThreadGroup.destroyImpl(ThreadGroup.java:256) [08:24:58] : [Step 1/2] at java.lang.ThreadGroup.destroy(ThreadGroup.java:238) [08:24:58] : [Step 1/2] at org.codehaus.mojo.exec.ExecJavaMojo.execute(ExecJavaMojo.java:328) [08:24:58] : [Step 1/2] at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134) [08:24:58] : [Step 1/2] at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207) [08:24:58] : [Step 1/2] at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153) [08:24:58] : [Step 1/2] at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145) [08:24:58] : [Step 1/2] at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116) [08:24:58] : [Step 1/2] at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80) [08:24:58] : [Step 1/2] at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51) [08:24:58] : [Step 1/2] at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128) [08:24:58] : [Step 1/2] at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307) [08:24:58] : [Step 1/2] at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193) [08:24:58] : [Step 1/2] at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106) [08:24:58] : [Step 1/2] at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863) [08:24:58] : [Step 1/2] at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288) [08:24:58] : [Step 1/2] at org.apache.maven.cli.MavenCli.main(MavenCli.java:199) [08:24:58] : [Step 1/2] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [08:24:58] : [Step 1/2] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:95) [08:24:58] : [Step 1/2] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55) [08:24:58] : [Step 1/2] at java.lang.reflect.Method.invoke(Method.java:507) [08:24:58] : [Step 1/2] at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289) [08:24:58] : [Step 1/2] at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229) [08:24:58] : [Step 1/2] at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415) [08:24:58] : [Step 1/2] at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356) After some investigation, it appears this is caused by log4j being on the classpath, pulled in as an optional compile dependency on infinispan-core. Since nothing on core depends on log4j the fix is to make the dependency scoped to test.