Erroneous class loading delegation to the application launcher classloader in
some cases
----------------------------------------------------------------------------------------
Key: FELIX-962
URL: https://issues.apache.org/jira/browse/FELIX-962
Project: Felix
Issue Type: Bug
Components: Framework
Reporter: Guillaume Nodet
Priority: Critical
Here is an example stack trace:
{code}
processstoreimp...@50 daemon, priority=5, in group 'main', status: 'RUNNING'
at
org.apache.felix.framework.searchpolicy.ModuleImpl.searchDynamicImports(ModuleImpl.java:1,215)
at
org.apache.felix.framework.searchpolicy.ModuleImpl.findClassOrResourceByDelegation(ModuleImpl.java:558)
at
org.apache.felix.framework.searchpolicy.ModuleImpl.access$100(ModuleImpl.java:59)
at
org.apache.felix.framework.searchpolicy.ModuleImpl$ModuleClassLoader.loadClass(ModuleImpl.java:1,382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at
org.apache.felix.framework.searchpolicy.ModuleImpl.getClassByDelegation(ModuleImpl.java:428)
at org.apache.felix.framework.Felix.loadBundleClass(Felix.java:1,341)
at
org.apache.felix.framework.BundleImpl.loadClass(BundleImpl.java:737)
at
org.springframework.osgi.util.BundleDelegatingClassLoader.findClass(BundleDelegatingClassLoader.java:99)
at
org.springframework.osgi.util.BundleDelegatingClassLoader.loadClass(BundleDelegatingClassLoader.java:156)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at
org.apache.xbean.classloader.MultiParentClassLoader.loadClass(MultiParentClassLoader.java:184)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:374)
at java.lang.ClassLoader.defineClass1(ClassLoader.java:-1)
at java.lang.ClassLoader.defineClass(ClassLoader.java:675)
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at
java.security.AccessController.doPrivileged(AccessController.java:-1)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at
org.apache.xbean.classloader.MultiParentClassLoader.loadClass(MultiParentClassLoader.java:200)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:374)
at org.apache.openjpa.util.ProxyMaps.afterEntrySet(ProxyMaps.java:74)
at org.apache.openjpa.util.java$util$HashMap$proxy.entrySet(Unknown
Source:-1)
at org.apache.openjpa.util.ProxyMaps.values(ProxyMaps.java:65)
at org.apache.openjpa.util.java$util$HashMap$proxy.values(Unknown
Source:-1)
at
org.apache.openjpa.kernel.SingleFieldManager.delete(SingleFieldManager.java:335)
at
org.apache.openjpa.kernel.SingleFieldManager.delete(SingleFieldManager.java:283)
at
org.apache.openjpa.kernel.StateManagerImpl.cascadeDelete(StateManagerImpl.java:2,861)
at org.apache.openjpa.kernel.BrokerImpl.delete(BrokerImpl.java:2,566)
at
org.apache.openjpa.kernel.SingleFieldManager.delete(SingleFieldManager.java:387)
at
org.apache.openjpa.kernel.SingleFieldManager.delete(SingleFieldManager.java:372)
at
org.apache.openjpa.kernel.SingleFieldManager.delete(SingleFieldManager.java:329)
at
org.apache.openjpa.kernel.SingleFieldManager.delete(SingleFieldManager.java:283)
at
org.apache.openjpa.kernel.StateManagerImpl.cascadeDelete(StateManagerImpl.java:2,861)
at org.apache.openjpa.kernel.BrokerImpl.delete(BrokerImpl.java:2,566)
at org.apache.openjpa.kernel.BrokerImpl.delete(BrokerImpl.java:2,531)
at
org.apache.openjpa.kernel.DelegatingBroker.delete(DelegatingBroker.java:1,046)
at
org.apache.openjpa.persistence.EntityManagerImpl.remove(EntityManagerImpl.java:659)
at org.apache.ode.store.jpa.JpaObj.delete(JpaObj.java:34)
at
org.apache.ode.store.jpa.DeploymentUnitDaoImpl.delete(DeploymentUnitDaoImpl.java:114)
at
org.apache.ode.store.ProcessStoreImpl$3.call(ProcessStoreImpl.java:303)
at
org.apache.ode.store.ProcessStoreImpl$3.call(ProcessStoreImpl.java:300)
at
org.apache.ode.store.ProcessStoreImpl$Callable.call(ProcessStoreImpl.java:701)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269)
at java.util.concurrent.FutureTask.run(FutureTask.java:123)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
at java.lang.Thread.run(Thread.java:613)
{code}
The interesting bit is the following exerpt:
{code}
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at
java.security.AccessController.doPrivileged(AccessController.java:-1)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
{code}
The current code in ModuleImpl#searchDynamicImports() does not really handle
this case. The reason is that the {{java.net.URLClassLoader$1}} class is an
anonymous PrivilegedExceptionAction.
The result is that the loop is aborted too soon and the launcher classloader is
used to delegate the call. In my application, it leads to all kinds of
LinkageError being thrown.
Note that this problem mostly happen on macs, which has a weird thing in the
classloader, trying to handle some org.apache.crimson / org.apache.xalan /
org.apache.xml / org.apache.xpath in some weird way.
Anyway, I have a patch to support this anonymous classes I will attach now.
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