Nested MBeans

[sameergarg]

I have two bean BeanA and BeanB. BeanA has a BeanB as its member variable.
public class BeanA{
private BeanB b

pubilc BeanB getBeanB(){
return b;
}

public void setBeanB(BeanB b){
this.b = b;
}
}

Both of them are registered as MBeans in configuration file like this

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

<!-- Contains beans which needs to be exposed as MBeans by spring framework -->
<beans>

<bean id="exporter" class="org.springframework.jmx.export.MBeanExporte r">
<property name="beans">
<map>
<entry key="bean:name=MBeanA">
<ref local="beanA"/>
</entry>
<entry key="bean:name=MBeanB">
<ref local="beanB"/>
</entry>
</map>
</property>
</bean>
<!-- User defined beans -->
<bean id="beanA" class="BeanA">
<constructor-arg>
<ref bean="beanB"/>
</constructor-arg>
</bean>

<bean id="beanB" class="BeanB"/>
</beans>

How can i get beanB as an MBean inside MBeanA so that when i view MBeanA in jmx console i see beanB as an nested MBean inside MBeanA.

Thanks in advance
Sameer Garg.

[Costin Leau]

The exporter creates the mbeans on the fly based on different methods like interfaces, getter/setters and so on. In order to nest mbeanB inside mbeanA the getter for B inside mbeanA would have to be replaced so it will return not B, but the mbean itself.
Considering that the mbean invokes the methods on the actual object(bean) you'll actually going to replace the 'real' getter.

If your mbeanA will return mbeanB on getB(), who will you be able to get the real B?

[robh]

This is something of an issue with JMX right now and it will be resolved with the inclusion of MXBeans in the next specification release.

Rob