jmx client connector question

[Thibaut Fagart]

Hi,

I'm encountering a problem : I have some MBeans deployed in a remote server (not spring enabled).

These MBeans interfaces expose some methods for which my client do not have the used parameter types in its classpath.

Thing is, I don't want/need to use those methods, but the org.springframework.jmx.access.MBeanClientIntercep tor#invoke method tries to fetch the whole MBeanInfo for the remote MBean and throws a ClassNotFoundException as I'm missing those classes, thus preventing me to use the plain String only methods.

Is there any way to achieve this or do I have to manually code the JMX calls/hack the client interceptor ?

Here is the stack trace
note : the com.hsbc.hbfr.loadbalancing.websphere.WAS5MBeanCli entInterceptor is a class basically copy/pasted from org.springframework.jmx.access.MBeanClientIntercep tor but adapted for websphere 5/5.1 implementation of JMX (not standard compliant)

org.springframework.jmx.access.MBeanInfoRetrievalE xception: Unable to locate class specified in method signature; nested exception is java.lang.ClassNotFoundException: com.hsbc.hbfr.ccf.at.admin.IMonitorableResource
Caused by:
java.lang.ClassNotFoundException: com.hsbc.hbfr.ccf.at.admin.IMonitorableResource
at com.ibm.ws.classloader.CompoundClassLoader.findCla ss(CompoundClassLoader.java(Compiled Code))
at com.ibm.ws.classloader.CompoundClassLoader.loadCla ss(CompoundClassLoader.java(Compiled Code))
at java.lang.ClassLoader.loadClass(ClassLoader.java(C ompiled Code))
at org.springframework.util.ClassUtils.forName(ClassU tils.java:177)
at org.springframework.util.ClassUtils.forName(ClassU tils.java:147)
at org.springframework.jmx.support.JmxUtils.parameter InfoToTypes(JmxUtils.java:130)
at com.hsbc.hbfr.loadbalancing.websphere.WAS5MBeanCli entInterceptor.retrieveMBeanInfo(WAS5MBeanClientIn terceptor.java:214)
at com.hsbc.hbfr.loadbalancing.websphere.WAS5MBeanCli entInterceptor.afterPropertiesSet(WAS5MBeanClientI nterceptor.java:143)
at com.hsbc.hbfr.loadbalancing.websphere.WAS5MBeanPro xyFactoryBean.afterPropertiesSet(WAS5MBeanProxyFac toryBean.java:69)
at com.hsbc.hbfr.ccf.at.lb.admin.controllers.LBModify Controller.createProxy(LBModifyController.java:191 )
at com.hsbc.hbfr.ccf.at.lb.admin.controllers.AppMonit orDiagnosticFetcher.fetchStatusUsingOldApplication MonitorInterface(AppMonitorDiagnosticFetcher.java: 91)
at com.hsbc.hbfr.ccf.at.lb.admin.controllers.AppMonit orDiagnosticFetcher.run(AppMonitorDiagnosticFetche r.java:74)
at com.hsbc.hbfr.ccf.at.lb.admin.controllers.LBStatus Controller$WorkerThread.run(LBStatusController.jav a:297)
[12/12/06 11:31:26:200 CET] 68fc591 SystemErr R org.springframework.jmx.access.MBeanInfoRetrievalE xception: Unable to locate class specified in method signature; nested exception is java.lang.ClassNotFoundException: com.hsbc.hbfr.ccf.at.admin.IMonitorableResource
[12/12/06 11:31:26:200 CET] 68fc591 SystemErr R Caused by: java.lang.ClassNotFoundException: com.hsbc.hbfr.ccf.at.admin.IMonitorableResource
[12/12/06 11:31:26:200 CET] 68fc591 SystemErr R at com.ibm.ws.classloader.CompoundClassLoader.findCla ss(CompoundClassLoader.java(Compiled Code))
[12/12/06 11:31:26:200 CET] 68fc591 SystemErr R at com.ibm.ws.classloader.CompoundClassLoader.loadCla ss(CompoundClassLoader.java(Compiled Code))
[12/12/06 11:31:26:200 CET] 68fc591 SystemErr R at java.lang.ClassLoader.loadClass(ClassLoader.java(C ompiled Code))
[12/12/06 11:31:26:200 CET] 68fc591 SystemErr R at org.springframework.util.ClassUtils.forName(ClassU tils.java:177)
[12/12/06 11:31:26:200 CET] 68fc591 SystemErr R at org.springframework.util.ClassUtils.forName(ClassU tils.java:147)
[12/12/06 11:31:26:200 CET] 68fc591 SystemErr R at org.springframework.jmx.support.JmxUtils.parameter InfoToTypes(JmxUtils.java:130)
[12/12/06 11:31:26:200 CET] 68fc591 SystemErr R at com.hsbc.hbfr.loadbalancing.websphere.WAS5MBeanCli entInterceptor.retrieveMBeanInfo(WAS5MBeanClientIn terceptor.java:214)

[Dave Syer]

I think you have to hack the MBeanClientInterceptor. Maybe you sould raise a JIRA issue (I think it would be a useful feature to be able to specify the interface of the MBean you want to proxy)?

[Thibaut Fagart]

If anyone is interested, what I did (at least temporarily), and which does want I want is replace the following from org.springframework.jmx.access.MBeanClientIntercep tor#retrieveMBeanInfo

for (int x = 0; x < operationInfo.length; x++) {
	MBeanOperationInfo opInfo = operationInfo[x];
	this.allowedOperations.put(
			new MethodCacheKey(
	opInfo.getName(),
	JmxUtils.parameterInfoToTypes(opInfo.getSignature())), opInfo);
}

by

for (int x = 0; x < operationInfo.length; x++) {
	MBeanOperationInfo opInfo = operationInfo[x];
	try {
		this.allowedOperations.put(
			new MethodCacheKey(
				opInfo.getName(),
				JmxUtils.parameterInfoToTypes(opInfo.getSignature())), 
			opInfo);
// allows for connecting to a remote instance even if all exposed operations can't be called 
	} catch (ClassNotFoundException e) {
		logger.warn("Unable to locate class specified in method signature, method won't be available");
	}
}

I did not test what would happen if calling a method that was rejected due to the classNotFound, but i guess it would throw an InvocationFailureException ?