Richard S. Hall wrote:
>
> http://underlap.blogspot.com/2006/11/experimental-fix-for-sunbug-4670071.html
>
For the record, here is another occurence of the problem on ServiceMix 4.3.
[ 129] [Active ] [ ] [ ] [ 60] OPS4J Pax Web -
Runtime (0.7.4)
[ 133] [Starting ] [ ] [ ] [ 60] OPS4J Pax Web -
Extender - Whiteboard (0.7.4)
Both bundles are trying to load class "org.osgi.service.http.HttpService".
Found one Java-level deadlock:
=============================
"Thread-12":
waiting to lock monitor 0x080eea70 (object 0x95506608, a
org.apache.felix.framework.ModuleImpl$ModuleClassLoaderJava5),
which is held by "FelixStartLevel"
"FelixStartLevel":
waiting to lock monitor 0x081b9768 (object 0x9552b2d8, a
org.apache.felix.framework.ModuleImpl$ModuleClassLoaderJava5),
which is held by "Thread-12"
Java stack information for the threads listed above:
===================================================
"Thread-12":
at
org.apache.felix.framework.ModuleImpl$ModuleClassLoader.findClass(ModuleImpl.java:1830)
- waiting to lock <0x95506608> (a
org.apache.felix.framework.ModuleImpl$ModuleClassLoaderJava5)
at
org.apache.felix.framework.ModuleImpl.findClassOrResourceByDelegation(ModuleImpl.java:727)
at org.apache.felix.framework.ModuleImpl.access$400(ModuleImpl.java:71)
at
org.apache.felix.framework.ModuleImpl$ModuleClassLoader.loadClass(ModuleImpl.java:1768)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at
org.apache.felix.framework.ModuleImpl.getClassByDelegation(ModuleImpl.java:645)
at
org.apache.felix.framework.resolver.WireImpl.getClass(WireImpl.java:99)
at
org.apache.felix.framework.ModuleImpl.searchImports(ModuleImpl.java:1390)
at
org.apache.felix.framework.ModuleImpl.findClassOrResourceByDelegation(ModuleImpl.java:722)
at org.apache.felix.framework.ModuleImpl.access$400(ModuleImpl.java:71)
at
org.apache.felix.framework.ModuleImpl$ModuleClassLoader.loadClass(ModuleImpl.java:1768)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at
org.ops4j.pax.web.service.internal.Activator.createHttpServiceFactory(Activator.java:98)
at
org.ops4j.pax.web.service.internal.Activator.access$200(Activator.java:47)
at org.ops4j.pax.web.service.internal.Activator$1.run(Activator.java:76)
at java.lang.Thread.run(Thread.java:662)
"FelixStartLevel":
at
org.apache.felix.framework.ModuleImpl$ModuleClassLoader.loadClass(ModuleImpl.java:1759)
- waiting to lock <0x9552b2d8> (a
org.apache.felix.framework.ModuleImpl$ModuleClassLoaderJava5)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at
org.apache.felix.framework.ModuleImpl.getClassByDelegation(ModuleImpl.java:645)
at
org.apache.felix.framework.resolver.WireImpl.getClass(WireImpl.java:99)
at
org.apache.felix.framework.ModuleImpl.searchImports(ModuleImpl.java:1390)
at
org.apache.felix.framework.ModuleImpl.findClassOrResourceByDelegation(ModuleImpl.java:722)
at org.apache.felix.framework.ModuleImpl.access$400(ModuleImpl.java:71)
at
org.apache.felix.framework.ModuleImpl$ModuleClassLoader.loadClass(ModuleImpl.java:1768)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at
org.apache.felix.framework.ModuleImpl$ModuleClassLoader.findClass(ModuleImpl.java:1907)
- locked <0x95506608> (a
org.apache.felix.framework.ModuleImpl$ModuleClassLoaderJava5)
at
org.apache.felix.framework.ModuleImpl.findClassOrResourceByDelegation(ModuleImpl.java:727)
at org.apache.felix.framework.ModuleImpl.access$400(ModuleImpl.java:71)
at
org.apache.felix.framework.ModuleImpl$ModuleClassLoader.loadClass(ModuleImpl.java:1768)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at
org.apache.felix.framework.ModuleImpl.getClassByDelegation(ModuleImpl.java:645)
at
org.apache.felix.framework.resolver.WireImpl.getClass(WireImpl.java:99)
at
org.apache.felix.framework.ModuleImpl.searchImports(ModuleImpl.java:1390)
at
org.apache.felix.framework.ModuleImpl.findClassOrResourceByDelegation(ModuleImpl.java:722)
at org.apache.felix.framework.ModuleImpl.access$400(ModuleImpl.java:71)
at
org.apache.felix.framework.ModuleImpl$ModuleClassLoader.loadClass(ModuleImpl.java:1768)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at
org.ops4j.pax.web.extender.whiteboard.internal.util.WebContainerUtils.webContainerAvailable(WebContainerUtils.java:46)
at
org.ops4j.pax.web.extender.whiteboard.internal.util.WebContainerUtils.<clinit>(WebContainerUtils.java:35)
at
org.ops4j.pax.web.extender.whiteboard.internal.Activator.start(Activator.java:78)
at
org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:629)
at org.apache.felix.framework.Felix.activateBundle(Felix.java:1842)
at org.apache.felix.framework.Felix.startBundle(Felix.java:1759)
at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1163)
at
org.apache.felix.framework.StartLevelImpl.run(StartLevelImpl.java:264)
at java.lang.Thread.run(Thread.java:662)
Found 1 deadlock.
The problem sometimes happens on very slow machines and with full DEBUG log
enabled, so I cannot really test that the JVM flags
"XX:+UnlockDiagnosticVMOptions -XX:+UnsyncloadClass" work reliably as a
workaround.
metatech
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