Hi,
I'm trying to wrap a LTW aspect around a third-party webapp to do some
debugging/profiling. I have no access to change/modify the code, but at
least I was hoping to see where/why some things were happening. The
webapp is running under a Tomcat 6.0.35 server.
I tried to write up a small, very innocuous aspect (ie: just prints the
name of the method that is being executed) and tested it out with a
HelloWorld servlet/webapp . Everything worked as expected.
When I tried to use it with the third-party app, things seem to be working
properly at first:
<catalina.out snip>
WebappClassLoader@1c23f1bb] info AspectJ Weaver Version 1.7.3 built on
Thursday Jun 13, 2013 at 19:41:31 GMT
[WebappClassLoader@1c23f1bb] info register classloader
org.apache.catalina.loader.WebappClassLoader@1c23f1bb
[WebappClassLoader@1c23f1bb] info using configuration
file:/Library/Tomcat/apache-tomcat-6.0.35-jira/webapps/jira/WEB-INF/lib/ia-aspects-0.0.1-SNAPSHOT.jar!/META-INF/aop.xml
[WebappClassLoader@1c23f1bb] info register aspect com.ia.UseProfiler
....
[WebappClassLoader@1c23f1bb] weaveinfo Join point 'method-execution(int
com.credo.linker.user.util.DefaultUserManager.getTotalUserCount())' in Type
'com.credo.linker.user.util.DefaultUserManager'
(DefaultUserManager.java:81) advised by after advice from
'com.ia.UseProfiler' (UseProfiler.aj:20)
[WebappClassLoader@1c23f1bb] weaveinfo Join point
'method-execution(java.util.Collection
com.credo.linker.user.util.DefaultUserManager.getUsers())' in Type
'com.credo.linker.user.util.DefaultUserManager'
(DefaultUserManager.java:88) advised by after advice from
'com.ia.UseProfiler' (UseProfiler.aj:20)
</snip>
However, shortly after, I see the following show up in catalina.out:
[ModuleClassLoader@4e730222] info AspectJ Weaver Version 1.7.3 built on
Thursday Jun 13, 2013 at 19:41:31 GMT
[ModuleClassLoader@4e730222] info register classloader
org.apache.felix.framework.ModuleImpl$ModuleClassLoader@4e730222
[ModuleClassLoader@4e730222] info using configuration
file:/Library/Tomcat/apache-tomcat-6.0.35-jira/webapps/jira/WEB-INF/lib/ia-aspects-0.0.1-SNAPSHOT.jar!/META-INF/aop.xml
[ModuleClassLoader@4e730222] info register aspect com.ia.UseProfiler
Jul 29, 2013 1:48:25 PM org.aspectj.weaver.tools.Jdk14Trace error
SEVERE: register definition failed
java.lang.RuntimeException: Cannot register non aspect: com$ia$UseProfiler
, com.ia.UseProfiler
at org.aspectj.weaver.bcel.BcelWeaver.addLibraryAspect(BcelWeaver.java:221)
at
org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor.registerAspects(ClassLoaderWeavingAdaptor.java:478)
at
org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor.registerDefinitions(ClassLoaderWeavingAdaptor.java:303)
at
org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor.initialize(ClassLoaderWeavingAdaptor.java:170)
at
org.aspectj.weaver.loadtime.Aj$ExplicitlyInitializedClassLoaderWeavingAdaptor.initialize(Aj.java:313)
at
org.aspectj.weaver.loadtime.Aj$ExplicitlyInitializedClassLoaderWeavingAdaptor.getWeavingAdaptor(Aj.java:318)
at org.aspectj.weaver.loadtime.Aj$WeaverContainer.getWeaver(Aj.java:292)
at org.aspectj.weaver.loadtime.Aj.preProcess(Aj.java:103)
at
org.aspectj.weaver.loadtime.ClassPreProcessorAgentAdapter.transform(ClassPreProcessorAgentAdapter.java:54)
at sun.instrument.TransformerManager.transform(TransformerManager.java:169)
at
sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:365)
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:1829)
at
org.apache.felix.framework.ModuleImpl.findClassOrResourceByDelegation(ModuleImpl.java:716)
at org.apache.felix.framework.ModuleImpl.access$200(ModuleImpl.java:73)
at
org.apache.felix.framework.ModuleImpl$ModuleClassLoader.loadClass(ModuleImpl.java:1690)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at
org.apache.felix.framework.ModuleImpl.getClassByDelegation(ModuleImpl.java:634)
at org.apache.felix.framework.Felix.createBundleActivator(Felix.java:3653)
at org.apache.felix.framework.Felix.activateBundle(Felix.java:1812)
at org.apache.felix.framework.Felix.startBundle(Felix.java:1734)
at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1143)
at org.apache.felix.framework.StartLevelImpl.run(StartLevelImpl.java:264)
at java.lang.Thread.run(Thread.java:680)
I'm not entirely sure what is happening, but it appears that the webapp is
loading its own classloader (Felix) for use in the application, and that
the Felix classloader does not know how to register the aspects.
I am starting tomcat with -javaagent:/path/to/aspectjweaver-1.7.3.jar
Is this a class loader issue in which the Felix classloader does not have
access to the aspectjweaver classes?
How do I get around the problem?
My aop.xml is pretty mundane as well:
<aspectj>
<weaver options="-verbose -showWeaveInfo">
<include within="com.credo.linker.user.*"/>
</weaver>
<aspects>
<aspect name="com.ia. UseProfiler"/>
</aspects>
</aspectj>
Thanks!
Eric
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