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How to manage instrumentation in application deployed on JBoss?
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created by <a href="https://community.jboss.org/people/adesanctis">adesanctis</a> in <i>Javassist</i> - <a href="https://community.jboss.org/message/715422#715422">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hello everybody,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I'm trying to instrument classes in JBoss Enterprise application on JBoss EA5.0</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Using this code:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><table><tbody><tr><td style=";"></td><td style=";">public byte[] transform(ClassLoader loader,</td></tr><tr><td style=";">        </td><td style=";">String className,</td></tr><tr><td style=";">        </td><td style=";">Class classBeingRedefined,</td></tr><tr><td style=";">        </td><td style=";">ProtectionDomain protectionDomain,</td></tr><tr><td style=";">        </td><td style=";">byte[] classfileBuffer) throws IllegalClassFormatException {</td></tr><tr><td style=";">    </td><td style=";">// The class name contains slashes instead of periods, so use transform those to</td></tr><tr><td style=";">    </td><td style=";">// dots for readability within the trace</td></tr><tr><td style=";">    </td><td style=";">String dotClassName = className.replace('/', '.');</td></tr></tbody></table><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><table><tbody><tr><td style=";">    </td><td style=";">if (className.startsWith("$")) {</td></tr><tr><td style=";">        </td><td style=";">return null;</td></tr><tr><td style=";">    </td><td style=";">}</td></tr></tbody></table><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><table><tbody><tr><td style=";">    </td><td style=";">// Only instrument a class once</td></tr><tr><td style=";">    </td><td style=";">if (instrumentedClasses.contains(className)) {</td></tr><tr><td style=";">        </td><td style=";">return null;</td></tr><tr><td style=";">    </td><td style=";">}</td></tr><tr><td style=";">    </td><td style=";">instrumentedClasses.add(className);</td></tr></tbody></table><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><table><tbody><tr><td style=";">    </td><td style=";">// Skip in the list of class prefixes to skip</td></tr><tr><td style=";">    </td><td style=";">for (MethodSelector classToSkip : classesToSkip) {</td></tr><tr><td style=";">        </td><td style=";">if (dotClassName.startsWith(classToSkip.getPackageName())) {</td></tr><tr><td style=";">            </td><td style=";">return null;</td></tr><tr><td style=";">        </td><td style=";">}</td></tr><tr><td style=";">    </td><td style=";">}</td></tr></tbody></table><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><table><tbody><tr><td style=";">    </td><td style=";">if (logger.isInfoEnabled()) {</td></tr><tr><td style=";">        </td><td style=";">logger.info("Checking class: " + className);</td></tr><tr><td style=";">    </td><td style=";">}</td></tr><tr><td style=";">    </td><td style=";"></td></tr><tr><td style=";">    </td><td style=";">try {</td></tr><tr><td style=";">        </td><td style=";">classPool.insertClassPath(new ByteArrayClassPath(className, classfileBuffer));</td></tr><tr><td style=";">//        </td><td style=";">classPool.insertClassPath(new ClassClassPath(this.getClass()));</td></tr><tr><td style=";">        </td><td style=";"></td></tr><tr><td style=";">//        </td><td style=";">classPool.insertClassPath(new ClassClassPath(classBeingRedefined.getClass()));</td></tr><tr><td style=";">        </td><td style=";"><strong>CtClass cc = classPool.get(dotClassName);</strong></td></tr><tr><td style=";">//        </td><td style=";">CtClass cc = classPool.makeClass(new ByteArrayInputStream(classfileBuffer));        </td><td style=";"></td></tr></tbody></table><p>//</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>In bold line where exception is raised.</p><p>I suppose that arror is related to specific class loader used for load class.</p><p>The question is: how to manage classes independently from class loader used? Is there a way to manage all possible case when working on JBoss?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thank you</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Alessandro</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>09:37:59,040 ERROR [STDERR] javassist.NotFoundException: com.arjuna.ats.internal.jta.recovery.arjunacore.RecoveryXids</p><p>09:37:59,040 ERROR [STDERR]     at javassist.ClassPool.get(ClassPool.java:436)</p><p>09:37:59,040 ERROR [STDERR]     at by.concept.applicationtracer.AdvancedTransformer.transform(AdvancedTransformer.java:163)</p><p>09:37:59,040 ERROR [STDERR]     at sun.instrument.TransformerManager.transform(TransformerManager.java:169)</p><p>09:37:59,040 ERROR [STDERR]     at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:365)</p><p>09:37:59,040 ERROR [STDERR]     at java.lang.ClassLoader.defineClass1(Native Method)</p><p>09:37:59,040 ERROR [STDERR]     at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)</p><p>09:37:59,040 ERROR [STDERR]     at java.lang.ClassLoader.defineClass(ClassLoader.java:615)</p><p>09:37:59,040 ERROR [STDERR]     at org.jboss.classloader.spi.base.BaseClassLoader.access$200(BaseClassLoader.java:67)</p><p>09:37:59,040 ERROR [STDERR]     at org.jboss.classloader.spi.base.BaseClassLoader$2.run(BaseClassLoader.java:633)</p><p>09:37:59,040 ERROR [STDERR]     at org.jboss.classloader.spi.base.BaseClassLoader$2.run(BaseClassLoader.java:592)</p><p>09:37:59,040 ERROR [STDERR]     at java.security.AccessController.doPrivileged(Native Method)</p><p>09:37:59,040 ERROR [STDERR]     at org.jboss.classloader.spi.base.BaseClassLoader.loadClassLocally(BaseClassLoader.java:591)</p><p>09:37:59,040 ERROR [STDERR]     at org.jboss.classloader.spi.base.BaseClassLoader.loadClassLocally(BaseClassLoader.java:568)</p><p>09:37:59,040 ERROR [STDERR]     at org.jboss.classloader.spi.base.BaseDelegateLoader.loadClass(BaseDelegateLoader.java:135)</p><p>09:37:59,040 ERROR [STDERR]     at org.jboss.classloader.spi.filter.FilteredDelegateLoader.loadClass(FilteredDelegateLoader.java:131)</p><p>09:37:59,040 ERROR [STDERR]     at org.jboss.classloader.spi.base.ClassLoadingTask$ThreadTask.run(ClassLoadingTask.java:455)</p><p>09:37:59,040 ERROR [STDERR]     at org.jboss.classloader.spi.base.ClassLoaderManager.nextTask(ClassLoaderManager.java:267)</p><p>09:37:59,040 ERROR [STDERR]     at org.jboss.classloader.spi.base.ClassLoaderManager.process(ClassLoaderManager.java:166)</p><p>09:37:59,040 ERROR [STDERR]     at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:276)</p><p>09:37:59,040 ERROR [STDERR]     at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:1138)</p><p>09:37:59,040 ERROR [STDERR]     at org.jboss.classloader.spi.base.BaseClassLoader.loadClassFromDomain(BaseClassLoader.java:862)</p><p>09:37:59,040 ERROR [STDERR]     at org.jboss.classloader.spi.base.BaseClassLoader.doLoadClass(BaseClassLoader.java:502)</p><p>09:37:59,040 ERROR [STDERR]     at org.jboss.classloader.spi.base.BaseClassLoader.loadClass(BaseClassLoader.java:447)</p></div>
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