| RE: (RESOLVED?) RE: [aspectj-users] Important aspects of JDK1.4 weaving |
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Hello again Mr. Bodkin!
I wish I had the success with Alex's method that you
have. I've been trying it in several revisions of Weblogic 8.1, on both
the examples and the medrec servers and apps. After several trials and
errors, as I learned the ins-and-outs of the scheme, I was able to achieve
weaving. However, even in my partial success, the exceptions
thrown are truly magnificent in their breadth. My first thought
was that it had to do with some sort of recursive classloading problem of the
sort which the ClassPreProcessorAdapter is trying to avoid by screening the
class names. However, closer examination ruled that out pretty
quickly.
In general, this particular
potential solution to JDK1.4 weaving is not ideal, since you must
re-Hook.Plug your adaptor against the tools.jar library for the JDK being
used at that particular moment, by the particular WebLogic
SP/revision. That creates creative installation issues. I have
found good documentation on WebLogic classloaders however, so I will
try that solution next, though if the Hook.Plug exception I got just
so happens to ring a bell with you, I'd appreciate any comments.
I
poked through the AspectJ source a bit (through the web interface) to try
and figure out the exceptions. It appears that the cause is that the following variable,
whose declaration from WeavingAdaptor.java is shown here, is null at the
time the method in question is invoked:
protected BcelWorld bcelWorld;
This fact, in turn suggests the method init( was never
called, but that method call is in a constructor, so its being missed seems
unlikely. But here is the exception anyway, for your
examination:
while trying to load (not weave)
"weblogic/utils/NestedException"
java.lang.NullPointerException at org.aspectj.weaver.tools.WeavingAdaptor$WeavingClassFileProvider.<init>(WeavingAdaptor.java:472) at org.aspectj.weaver.tools.WeavingAdaptor.getWovenBytes(WeavingAdaptor.java:276) at org.aspectj.weaver.tools.WeavingAdaptor.weaveClass(WeavingAdaptor.java:210) at org.aspectj.weaver.loadtime.Aj.preProcess(Aj.java:65) at org.aspectj.ext.ltw13.ClassPreProcessorAdapter.preProcess(ClassPreProcessorAdapter.java:30) at org.codehaus.aspectwerkz.hook.impl.ClassPreProcessorHelper.defineClass0Pre(ClassPreProcessorHelper.java:107) at java.lang.ClassLoader.defineClass(ClassLoader.java:539) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123) at java.net.URLClassLoader.defineClass(URLClassLoader.java:251) at java.net.URLClassLoader.access$100(URLClassLoader.java:55) at java.net.URLClassLoader$1.run(URLClassLoader.java:194) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:187) at java.lang.ClassLoader.loadClass(ClassLoader.java:289) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274) at java.lang.ClassLoader.loadClass(ClassLoader.java:235) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302) at java.lang.ClassLoader.defineClass0(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:539) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123) at java.net.URLClassLoader.defineClass(URLClassLoader.java:251) at java.net.URLClassLoader.access$100(URLClassLoader.java:55) at java.net.URLClassLoader$1.run(URLClassLoader.java:194) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:187) at java.lang.ClassLoader.loadClass(ClassLoader.java:289) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274) at java.lang.ClassLoader.loadClass(ClassLoader.java:235) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302) at java.lang.Class.getDeclaredConstructors0(Native Method) at java.lang.Class.privateGetDeclaredConstructors(Class.java:1618) at java.lang.Class.getConstructor0(Class.java:1930) at java.lang.Class.newInstance0(Class.java:278) at java.lang.Class.newInstance(Class.java:261) at javax.xml.parsers.FactoryFinder.newInstance(FactoryFinder.java:95) at javax.xml.parsers.FactoryFinder.find(FactoryFinder.java:174) at javax.xml.parsers.SAXParserFactory.newInstance(SAXParserFactory.java:87) at org.aspectj.weaver.loadtime.definition.DocumentParser.getXMLReader(DocumentParser.java:129) at org.aspectj.weaver.loadtime.definition.DocumentParser.parse(DocumentParser.java:85) at org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor.parseDefinitions(ClassLoaderWeavingAdaptor.java:162) at org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor.initialize(ClassLoaderWeavingAdaptor.java:102) at org.aspectj.weaver.loadtime.Aj$ExplicitlyInitializedClassLoaderWeavingAdaptor.initialize(Aj.java:130) at org.aspectj.weaver.loadtime.Aj$ExplicitlyInitializedClassLoaderWeavingAdaptor.getWeavingAdaptor(Aj.java:135) at org.aspectj.weaver.loadtime.Aj$WeaverContainer.getWeaver(Aj.java:101) at org.aspectj.weaver.loadtime.Aj.preProcess(Aj.java:61) at com.dbi.bwd.bwagent.LTW13.preProcess(LTW13.java:30) at org.codehaus.aspectwerkz.hook.impl.ClassPreProcessorHelper.defineClass0Pre(ClassPreProcessorHelper.java:107) at java.lang.ClassLoader.defineClass(ClassLoader.java:539) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123) at java.net.URLClassLoader.defineClass(URLClassLoader.java:251) at java.net.URLClassLoader.access$100(URLClassLoader.java:55) at java.net.URLClassLoader$1.run(URLClassLoader.java:194) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:187) at java.lang.ClassLoader.loadClass(ClassLoader.java:289) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274) at java.lang.ClassLoader.loadClass(ClassLoader.java:235) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302) |