Jwebap-profiler for j2ee application / Discussion / Help: org.jwebap.core.RegisterException: component

MDT - 2009-03-18

Hi,
I installed in a tomcat server but I get this:

2009-03-18 13:20:09 ERROR org.jwebap.startup.Startup - register component:org.jwebap.plugin.http.HttpComponent fail.component not found:org.jwebap.plugin.http.HttpComponent
org.jwebap.core.RegisterException: component not found:org.jwebap.plugin.http.HttpComponent
    at org.jwebap.core.RuntimeContext.registerComponent(RuntimeContext.java:64)
    at org.jwebap.startup.Startup.startup(Startup.java:86)
    at org.jwebap.startup.Startup.startup(Startup.java:54)
    at org.jwebap.startup.JwebapListener.contextInitialized(JwebapListener.java:36)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3843)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4350)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
    at org.apache.catalina.core.StandardService.start(StandardService.java:516)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:578)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Caused by: java.lang.ClassNotFoundException: org.jwebap.plugin.http.HttpComponent
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1360)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1206)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:374)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:169)
    at org.jwebap.core.RuntimeContext.registerComponent(RuntimeContext.java:61)
    ... 18 more
org.jwebap.toolkit.bytecode.InjectException: test.Test????.
    at org.jwebap.toolkit.bytecode.asm.ASMInjectorStrategy.injectInternal(ASMInjectorStrategy.java:145)
    at org.jwebap.toolkit.bytecode.asm.ASMInjectorStrategy.inject(ASMInjectorStrategy.java:117)
    at org.jwebap.toolkit.bytecode.ClassEnhancer.createClass(ClassEnhancer.java:107)
    at org.jwebap.toolkit.bytecode.ClassEnhancer.createClass(ClassEnhancer.java:95)
    at org.jwebap.toolkit.bytecode.ClassEnhancer.createClass(ClassEnhancer.java:82)
    at org.jwebap.plugin.tracer.method.MethodComponent.injectClass(MethodComponent.java:92)
    at org.jwebap.plugin.tracer.method.MethodComponent.startup(MethodComponent.java:55)
    at org.jwebap.core.RuntimeContext.registerComponent(RuntimeContext.java:73)
    at org.jwebap.startup.Startup.startup(Startup.java:86)
    at org.jwebap.startup.Startup.startup(Startup.java:54)
    at org.jwebap.startup.JwebapListener.contextInitialized(JwebapListener.java:36)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3843)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4350)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
    at org.apache.catalina.core.StandardService.start(StandardService.java:516)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:578)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Caused by: java.lang.ClassNotFoundException: test.Test not found.
    at org.jwebap.toolkit.bytecode.asm.ASMInjectorStrategy.defineClass(ASMInjectorStrategy.java:213)
    at org.jwebap.toolkit.bytecode.asm.ASMInjectorStrategy.injectInternal(ASMInjectorStrategy.java:142)
    ... 25 more

TIA
MDT

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- MDT - 2009-03-18
  
  Hi,
  I solved, the issue was in the example classes for tracer are in the form
  org.jwebap.plugin.<name of plugin> as example org.jwebap.plugin.http.HttpComponent, instead of org.jwebap.plugin.tracer.<name of plugin>.
  Now I have the console up and running, I configured
  HttpComponent
  MethodComponent
  JdbcComponent
  but I can only see the Http Component traces and stats, ther others two are empty, I don't see errors in log.
  I'm using tomcat 6 with jdk 6 on Mac Os X 10.5.x
  
  TIA
  Marco
  
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- leadyu - 2009-03-31
  
  Hi Marco,
  
  If you use jwebap 0.6 ,you can configure JdbcComponent and MethodComponent in jwebap console.
  
  See console->deploy->plugins->tracer-><your component>.
  
  For JdbcComponent: you must configure 'driver-clazz' param to monitor jdbc connection.
  
  For MethodComponent: you should configure 'detect-clazz' param (package name or class name that detected by MethodComponent, like ‘test.*;test.Test’ , divided by ';' ) .
  
  When you hava configured these, restartup you application.
  
  leadyu
  
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- Shoumik Kahali - 2009-06-02
  
  I am also getting the error as mentioned in the initial post...
  But I am not a able to understand the proposed solution in second post.
  I can understand I look dumb here but I will appreciate what exact steps you have taken to fix the issue...
  
  Thanks in Advance
  Shoumik
  
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- leadyu - 2009-06-03
  
  Hi Shoumik
  
  The error:
  
  ... 18 more
  org.jwebap.toolkit.bytecode.InjectException: test.Test????.
  at org.jwebap.toolkit.bytecode.asm.ASMInjectorStrategy.injectInternal(ASMInjectorStrategy.java:145)
  
  It is cause by MethodComponent.You can change your configue in jwebap console to fix it.
  
  See, click console->deploy->plugins->tracer->MethodComponent
  
  change the 'detect-clazz' parameter to your class or package you want to detect ,default is 'test.Test', so you get the error.
  
  leadyu
  
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titorocks - 2011-07-06

Hi,
I have installed Tomcat and have been able to start the jwebap console (http://localhost:8080/servlets-example/detect/console/?null )
But when i am going to Deploy->Plugins->Tracer(${ABSOLUTE_PATH}/tracer_0.6.1.jar) -> MethodComponent and in "detect-clazzs" I am giving my class name(CookieExample) and checking in Method Traces, nothing is showing.
When I check the logs, i can see the following error -

WARNING: param 'null' can not initial into Context. error:org.commontemplate.cor
e.VariableException: ?????????: null ?????????: null

Can anyone please help ?

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