问题
What is the MBeanServerFactory.findMBeanServer(null); exactly doing?
Returns a list of all registered MBeanServers? Registered where?
I am asking because I have the following problem.
I have a java web app deployed in Tomcat using a service wrapper.
I have custom connector implementations in my server.xml that use ManagedBeans (spring enabled).
If I start the app via the service wrapper all is ok.
If I start the web app through Tomcat directly it seems that the deployment breaks.
All I see in the logs is that the connector does a
MBeanServerFactory.findMBeanServer(null);
and then tries to invoke the bean beanServer.invoke(name, operationName, null, null);
The result is a InstanceNotFoundException.
It seems that the managed beans are not loaded in case I do not use a service wrapper? Is my understanding correct? Any input on how to debug this issue is
highly welcome!
回答1:
The javadoc says that when you pass null, it returns the servers registered in the current JVM. If you are using JSW, then you cannot use null as JSW forks the VM as a separate process. This is why you see the InstanceNotFoundException.
来源：https://stackoverflow.com/questions/5736332/question-on-tomcat-and-jmx