Mahesh Kantharaj created FELIX-6729:
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Summary: Repeated Looping observed with Felix Main and Felix
Framework jar usage
Key: FELIX-6729
URL: https://issues.apache.org/jira/browse/FELIX-6729
Project: Felix
Issue Type: Bug
Components: Framework, Main
Affects Versions: framework-7.0.5
Environment: Oracle WebLogic on which Custom Plugin applications have
been deployed which uses the "org.apache.felix.org.apache.felix.main.jar" and
"org.apache.felix.framework.jar" jar as 3rd party references for OSGi
implementation.
OS : Oracle Linux
Reporter: Mahesh Kantharaj
Fix For: framework-7.0.5
The Custom Plugin which references the
"org.apache.felix.org.apache.felix.main.jar" and
"org.apache.felix.framework.jar" 3rd Party jars is deployed on WLS (Oracle
WebLogic Server). The Felix Framework jar is used in the Custom Plugin to
enable the plugin to interact with the OAM (Oracle Access Manager) system
wherein it helps in integrating the custom plugin with the OAM seamlessly and
efficiently.
However there is an intermittent issue that is observed during the
initialization phase (Deployed Server restart) of the custom plugin wherein
repeated looping is observed 3ith the below mentioned stack upon java.net.URL
usage.
This results in Stack Over Exception with an abnormal compressed class space
growth that eventually leads to Out of Memory exception and thereby the JVM
crashes. The only workaround available with us now is to perform the Server
restart on which the custom plugin is deployed so that the Full GC is triggered
and thereby the compressed class space is cleared as a temporary relief to the
issue. We would like to have the URL Handler related looping stack from Felix
Main and Framework to be investigated to devise a solution from Apache team, to
resolve the issue (This seems to be a race condition scenario based on issue
symptoms).
at
org.apache.felix.framework.util.SecureAction.getDeclaredMethod(SecureAction.java:850)
at
org.apache.felix.framework.URLHandlers.getFrameworkFromContext(URLHandlers.java:752)
at
org.apache.felix.framework.URLHandlersStreamHandlerProxy.getStreamHandlerService(URLHandlersStreamHandlerProxy.java:574)
at
org.apache.felix.framework.URLHandlersStreamHandlerProxy.parseURL(URLHandlersStreamHandlerProxy.java:369)
at java.net.URL.<init>(URL.java:639)
at java.net.URL.<init>(URL.java:507)
**********
The complete stack trace having the deep recursive call related to Felix jar is
pasted below for your reference:
<FINER> <ClassLoader> Thread [ACTIVE] ExecuteThread: '37' for queue:
'weblogic.kernel.Default (self-tuning)' Defining
org.osgi.service.packageadmin.ExportedPackage from
file:/p01/app/oracle/oam12c/wlserver/server/lib/org.apache.felix.org.apache.felix.main.jar
in 'weblogic-launcher'
java.lang.Exception
at sun.misc.URLClassPath$FileLoader.getResource(URLClassPath.java:1340)
at sun.misc.URLClassPath.getResource(URLClassPath.java:250)
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.getDeclaredMethod(Class.java:2128)
at
org.apache.felix.framework.util.SecureAction.getDeclaredMethod(SecureAction.java:850)
at
org.apache.felix.framework.URLHandlers.getFrameworkFromContext(URLHandlers.java:752)
at
org.apache.felix.framework.URLHandlersStreamHandlerProxy.getStreamHandlerService(URLHandlersStreamHandlerProxy.java:574)
at
org.apache.felix.framework.URLHandlersStreamHandlerProxy.parseURL(URLHandlersStreamHandlerProxy.java:369)
at java.net.URL.<init>(URL.java:639)
at java.net.URL.<init>(URL.java:507)
at sun.misc.URLClassPath$FileLoader.getResource(URLClassPath.java:1340)
at sun.misc.URLClassPath.getResource(URLClassPath.java:250)
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.getDeclaredMethod(Class.java:2128)
at
org.apache.felix.framework.util.SecureAction.getDeclaredMethod(SecureAction.java:850)
at
org.apache.felix.framework.URLHandlers.getFrameworkFromContext(URLHandlers.java:752)
at
org.apache.felix.framework.URLHandlersStreamHandlerProxy.getStreamHandlerService(URLHandlersStreamHandlerProxy.java:574)
at
org.apache.felix.framework.URLHandlersStreamHandlerProxy.parseURL(URLHandlersStreamHandlerProxy.java:369)
at java.net.URL.<init>(URL.java:639)
at java.net.URL.<init>(URL.java:507)
at sun.misc.URLClassPath$FileLoader.getResource(URLClassPath.java:1340)
at sun.misc.URLClassPath.getResource(URLClassPath.java:250)
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.getDeclaredMethod(Class.java:2128)
at
org.apache.felix.framework.util.SecureAction.getDeclaredMethod(SecureAction.java:850)
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