Spring MBean client thinks MBean service is RMI connection

Question

I'm having problems connecting my own Spring MBean client to the "Hello World!" service as seen in the JMX examples from Oracle. The service and included client are working fine.

I think it has to do with an RMI connection coming back when it's expecting something else... but I don't know what the solution would be, or even if that is a correct inference.

Or am I somehow using the "wrong" MBeanServerConnectionFactoryBean ?

Any ideas?

Here's my spring config for this bean:

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

<bean id="mBeanServerClient"
      class="org.springframework.jmx.support.MBeanServerConnectionFactoryBean">
    <property name="serviceUrl"
              value="service:jmx:rmi://localhost/jndi/rmi://localhost:9999/jmxrmi" />
</bean>

<bean id="jmxClient"
      class="com.foo.jmx.MBeanPollingClient">
    <property name="mbeanServerConnection"
              ref="mBeanServerClient" />
</bean>
</beans>

Here's my implementing code:

import org.springframework.jmx.support.MBeanServerConnectionFactoryBean;

public class MBeanPollingClient {

    private MBeanServerConnectionFactoryBean mbeanServerConnection = null;

    public void setMbeanServerConnection ( MBeanServerConnectionFactoryBean m )
    {
        mbeanServerConnection = m;
    }

    public MBeanServerConnectionFactoryBean getMbeanServerConnection ( )
    {
        return mbeanServerConnection;
    }

}

The error I'm getting:

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jmxClient' defined in class path resource [jmx-beans.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'javax.management.remote.rmi.RMIConnector$RemoteMBeanServerConnection' to required type 'org.springframework.jmx.support.MBeanServerConnectionFactoryBean' for property 'mbeanServerConnection'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [javax.management.remote.rmi.RMIConnector$RemoteMBeanServerConnection] to required type [org.springframework.jmx.support.MBeanServerConnectionFactoryBean] for property 'mbeanServerConnection': no matching editors or conversion strategy found

Answer 1

Spring will give you an MBeanServerConnection provided by the factory. To fix the error just change

private MBeanServerConnectionFactoryBean mbeanServerConnection;

to

private MBeanServerConnection mbeanServerConnection;