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Posted to dev@felix.apache.org by "Robert Munteanu (JIRA)" <ji...@apache.org> on 2019/02/22 11:57:00 UTC

[jira] [Created] (FELIX-6067) ClassLoading can fail unpredictably due to interrupts

Robert Munteanu created FELIX-6067:
--------------------------------------

             Summary: ClassLoading can fail unpredictably due to interrupts
                 Key: FELIX-6067
                 URL: https://issues.apache.org/jira/browse/FELIX-6067
             Project: Felix
          Issue Type: Bug
          Components: Framework
    Affects Versions: framework-6.0.2
            Reporter: Robert Munteanu


I noticed an intermittent issue with our Felix-based app (Apache Sling). The flows seems to be the following:

(thread 1)
- component C is started
- component C invokes method on class K1
- class K1 is first accessed now and runs class initializers
- K1 static initializer calls method from class K2
- class K2 loading is triggered

(thread 2)
- component C is stopped ( I _think_ due to configuration coming in )

(thread 1)
- during class loading of K2 a RuntimeException is thrown, resulting in all calls to K1 leading to NoClassDefFoundError 

At this point although the error should be transient the component is unusable since one of the classes it uses is not available.

For the record, the stack trace which causes this is

21.02.2019 14:50:50.292 *ERROR* [Apache Sling Repository Startup Thread #1] org.apache.sling.jcr.oak.server.internal.OakSlingRepositoryManager start: Uncaught Throwable trying to access Repository, calling stopRepository()
java.lang.ExceptionInInitializerError: null
        at org.apache.sling.jcr.oak.server.internal.OakSlingRepositoryManager.acquireRepository(OakSlingRepositoryManager.java:144) [org.apache.sling.jcr.oak.server:1.2.0]
        at org.apache.sling.jcr.base.AbstractSlingRepositoryManager.initializeAndRegisterRepositoryService(AbstractSlingRepositoryManager.java:481) [org.apache.sling.jcr.base:3.0.6]
        at org.apache.sling.jcr.base.AbstractSlingRepositoryManager.access$300(AbstractSlingRepositoryManager.java:86) [org.apache.sling.jcr.base:3.0.6]
        at org.apache.sling.jcr.base.AbstractSlingRepositoryManager$4.run(AbstractSlingRepositoryManager.java:462) [org.apache.sling.jcr.base:3.0.6]
Caused by: java.lang.RuntimeException: java.lang.InterruptedException
        at org.apache.felix.framework.ServiceRegistry.getService(ServiceRegistry.java:369)
        at org.apache.felix.framework.Felix.getService(Felix.java:3954)
        at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.transformClass(BundleWiringImpl.java:2383)
        at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.findClass(BundleWiringImpl.java:2081)
        at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1565)
        at org.apache.felix.framework.BundleWiringImpl.access$300(BundleWiringImpl.java:79)
        at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1982)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at org.apache.jackrabbit.oak.plugins.tree.factories.RootFactory.createSystemRoot(RootFactory.java:80) [org.apache.jackrabbit.oak-core:1.8.8]
        at org.apache.jackrabbit.oak.InitialContent.initialize(InitialContent.java:134) [org.apache.jackrabbit.oak-core:1.8.8]
        at org.apache.jackrabbit.oak.InitialContent.createInitialContent(InitialContent.java:74) [org.apache.jackrabbit.oak-core:1.8.8]
        at org.apache.jackrabbit.oak.InitialContent.<clinit>(InitialContent.java:70) [org.apache.jackrabbit.oak-core:1.8.8]
        ... 4 common frames omitted
Caused by: java.lang.InterruptedException: null
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1302)
        at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
        at org.apache.felix.framework.ServiceRegistry.getService(ServiceRegistry.java:365)
        ... 15 common frames omitted

(source code for all is available is needed)

Starting the component C at any later time fails with

21.02.2019 14:50:50.310 *ERROR* [Apache Sling Repository Startup Thread #2] org.apache.sling.jcr.oak.server.internal.OakSlingRepositoryManager start: Uncaught Throwable trying to access Repository, calling stopRepository()
java.lang.NoClassDefFoundError: Could not initialize class org.apache.jackrabbit.oak.InitialContent
        at org.apache.sling.jcr.oak.server.internal.OakSlingRepositoryManager.acquireRepository(OakSlingRepositoryManager.java:144) [org.apache.sling.jcr.oak.server:1.2.0]
        at org.apache.sling.jcr.base.AbstractSlingRepositoryManager.initializeAndRegisterRepositoryService(AbstractSlingRepositoryManager.java:481) [org.apache.sling.jcr.base:3.0.6]
        at org.apache.sling.jcr.base.AbstractSlingRepositoryManager.access$300(AbstractSlingRepositoryManager.java:86) [org.apache.sling.jcr.base:3.0.6]
        at org.apache.sling.jcr.base.AbstractSlingRepositoryManager$4.run(AbstractSlingRepositoryManager.java:462) [org.apache.sling.jcr.base:3.0.6]



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