LinkageError on startup
-----------------------
Key: GERONIMO-2866
URL: https://issues.apache.org/jira/browse/GERONIMO-2866
Project: Geronimo
Issue Type: Bug
Security Level: public (Regular issues)
Affects Versions: 2.0-M1
Environment: Win XP 1.5.0_10
Linux 1.5.0_10
Mac OS X 1.5.0_06
Reporter: Vitaly Pimenov
Hello, I'm a YourKit Java Profiler developer. Our customer have reported that
Geronimo 2.0 doesn't start with our profiler agent.
There is a LinkageError on server startup:
java.lang.LinkageError: loader (instance of
org/apache/geronimo/kernel/classloader/JarFileClassLoader): attempted
duplicate class definition for name:
"$javax/naming/Context$$EnhancerByCGLIB$$79faf44d$$FastClassByCGLIB$$e18c505c"
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
... 34 more
Looking into this, I have found that the problem is caused by dynamic byte-code
instrumentation: we add a special 'static transient boolean' field in some
classes and
"$javax/naming/Context$$EnhancerByCGLIB$$79faf44d$$FastClassByCGLIB$$e18c505c"
is one of them.
It looks like CGLIB somehow watches the classfile changes and tries to reload
class, modified by our instrumentation.
The problem arises because the names are identical.
Maybe it can be solved by customizing NamingPolicy used in CGLIB.
You can reproduce the problem with YourKit Java Profiler 6.0.11
http://yourkit.com/download/index.jsp
To run server with profiler you can just add 2 following lines at the beginning
or geronimo startup.bat
set PATH=<path to YourKit Java Profiler install dir>/bin/win32;%PATH%
set JAVA_TOOL_OPTIONS=-agentlib:yjpagent %JAVA_TOOL_OPTIONS%
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
