[jboss-dev-forums] [Design the new POJO MicroContainer] - Deadlock in DelegateUnitTestCase

[scott.stark@jboss.org]

While doing an install of the mc I saw the install fail in the following unit test due to the deadlock shown in the thread dump:

  | 11824 DEBUG [DelegateUnitTestCase] Got class: class org.jboss.test.classloader.delegate.support.a.TestAbstractFactory{cl=BaseClassLoader at 670fe2b9 codeSource=(file:/home/svn/JBossMC/jbossmc/classloader/target/tests-classes/ <no signer certificates>)} for org.jboss.test.classloader.delegate.support.a.TestAbstractFactory from BaseClassLoader at 670fe2b9
  | 
  | Full thread dump Java HotSpot(TM) 64-Bit Server VM (1.5.0_11-b03 mixed mode):
  | 
  | "B" prio=1 tid=0x0000002ae35e1fa0 nid=0x536c waiting for monitor entry [0x0000000041563000..0x0000000041565c30]
  |         at org.jboss.classloader.spi.base.BaseClassLoader.unlock(BaseClassLoader.java:701)
  |         - waiting to lock <0x0000002acaf81e50> (a org.jboss.classloader.spi.base.BaseClassLoader)
  |         at org.jboss.classloader.spi.base.BaseClassLoader.unlock(BaseClassLoader.java:583)
  |         at org.jboss.classloader.spi.base.ClassLoaderManager.nextTask(ClassLoaderManager.java:286)
  |         at org.jboss.classloader.spi.base.ClassLoaderManager.process(ClassLoaderManager.java:145)
  |         at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:193)
  |         at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:752)
  |         at org.jboss.classloader.spi.base.BaseClassLoader.loadClassFromDomain(BaseClassLoader.java:483)
  |         at org.jboss.classloader.spi.base.BaseClassLoader.loadClass(BaseClassLoader.java:158)
  |         - locked <0x0000002acaf88c70> (a org.jboss.classloader.spi.base.BaseClassLoader)
  |         at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
  |         at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
  |         - locked <0x0000002acaf88c70> (a org.jboss.classloader.spi.base.BaseClassLoader)
  |         at java.lang.ClassLoader.defineClass1(Native Method)
  |         at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
  |         at org.jboss.classloader.spi.base.BaseClassLoader.access$200(BaseClassLoader.java:58)
  |         at org.jboss.classloader.spi.base.BaseClassLoader$1.run(BaseClassLoader.java:279)
  |         at org.jboss.classloader.spi.base.BaseClassLoader$1.run(BaseClassLoader.java:246)
  |         at java.security.AccessController.doPrivileged(Native Method)
  |         at org.jboss.classloader.spi.base.BaseClassLoader.loadClassLocally(BaseClassLoader.java:244)
  |         - locked <0x0000002acaf88c70> (a org.jboss.classloader.spi.base.BaseClassLoader)
  |         at org.jboss.classloader.spi.base.BaseClassLoader.loadClassLocally(BaseClassLoader.java:217)
  |         at org.jboss.classloader.spi.base.BaseDelegateLoader.loadClass(BaseDelegateLoader.java:75)
  |         at org.jboss.classloader.spi.filter.FilteredDelegateLoader.loadClass(FilteredDelegateLoader.java:90)
  |         at org.jboss.classloader.spi.base.ClassLoadingTask$ThreadTask.run(ClassLoadingTask.java:449)
  |         at org.jboss.classloader.spi.base.ClassLoaderManager.nextTask(ClassLoaderManager.java:251)
  |         at org.jboss.classloader.spi.base.ClassLoaderManager.process(ClassLoaderManager.java:145)
  |         at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:193)
  |         at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:752)
  |         at org.jboss.classloader.spi.base.BaseClassLoader.loadClassFromDomain(BaseClassLoader.java:483)
  |         at org.jboss.classloader.spi.base.BaseClassLoader.loadClass(BaseClassLoader.java:158)
  |         - locked <0x0000002acaf88c70> (a org.jboss.classloader.spi.base.BaseClassLoader)
  |         at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
  |         at org.jboss.test.classloader.AbstractClassLoaderTest.assertLoadClass(AbstractClassLoaderTest.java:176)
  |         at org.jboss.test.classloader.AbstractClassLoaderTest.assertLoadClass(AbstractClassLoaderTest.java:158)
  |         at org.jboss.test.classloader.AbstractClassLoaderTest.assertLoadClass(AbstractClassLoaderTest.java:143)
  |         at org.jboss.test.classloader.delegate.test.DelegateUnitTestCase.access$100(DelegateUnitTestCase.java:54)
  |         at org.jboss.test.classloader.delegate.test.DelegateUnitTestCase$2.run(DelegateUnitTestCase.java:299)
  | 
  | "A" prio=1 tid=0x0000002ae31e7220 nid=0x536b in Object.wait() [0x0000000040f5e000..0x0000000040f5fdb0]
  |         at java.lang.Object.wait(Native Method)
  |         - waiting on <0x0000002acb05a558> (a java.util.Collections$SynchronizedList)
  |         at java.lang.Object.wait(Object.java:474)
  |         at org.jboss.classloader.spi.base.ClassLoaderManager.nextTask(ClassLoaderManager.java:204)
  |         - locked <0x0000002acb05a558> (a java.util.Collections$SynchronizedList)
  |         at org.jboss.classloader.spi.base.ClassLoaderManager.process(ClassLoaderManager.java:145)
  |         at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:193)
  |         at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:752)
  |         at org.jboss.classloader.spi.base.BaseClassLoader.loadClassFromDomain(BaseClassLoader.java:483)
  |         at org.jboss.classloader.spi.base.BaseClassLoader.loadClass(BaseClassLoader.java:158)
  |         - locked <0x0000002acaf81e50> (a org.jboss.classloader.spi.base.BaseClassLoader)
  |         at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
  |         at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
  |         - locked <0x0000002acaf81e50> (a org.jboss.classloader.spi.base.BaseClassLoader)
  |         at java.lang.Class.getDeclaredMethods0(Native Method)
  |         at java.lang.Class.privateGetDeclaredMethods(Class.java:2395)
  |         at java.lang.Class.getMethod0(Class.java:2642)
  |         at java.lang.Class.getMethod(Class.java:1579)
  |         at org.jboss.test.classloader.delegate.test.DelegateUnitTestCase$1.run(DelegateUnitTestCase.java:277)
  | 
  | 


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