java.io.InvalidObjectException with JMX MXBean with CompositeData - jmx

Question

I am trying to publish an MXBean to JMX but I am getting the following stack when I start the program and the bean is being published:
Caused by: java.io.InvalidObjectException: Do not know how to make a javax.management.openmbean.CompositeType from a CompositeData: no method from(CompositeData); no constructor has #ConstructorProperties annotation; does not have a public no-arg constructor; not an interface
at com.sun.jmx.mbeanserver.OpenConverter.invalidObjectException(OpenConverter.java:1403)
at com.sun.jmx.mbeanserver.OpenConverter$CompositeConverter.makeCompositeBuilder(OpenConverter.java:891)
at com.sun.jmx.mbeanserver.OpenConverter$CompositeConverter.checkReconstructible(OpenConverter.java:897)
at com.sun.jmx.mbeanserver.OpenConverter$CompositeBuilderCheckGetters.applicable(OpenConverter.java:1034)
at com.sun.jmx.mbeanserver.OpenConverter$CompositeConverter.makeCompositeBuilder(OpenConverter.java:868)
... 48 more
Now I now that MXBeans are only supposed use OpenMbean types as per the documentation but my class is only using java.lang.String and javax.management.openmbean.CompositeData, so I do not know why it is failing. The interface is:
import javax.management.MXBean;
import javax.management.openmbean.CompositeData;
#MXBean
public interface JmxAdministrationApi {
String synchronize(CompositeData clientInfo);
}
It is worth noting that the bean was being published correctly until I added the CompositeData parameter (i.e. with no parameters), and only then did this error occur.
Any help with this would be greatly appreciated.
Thanks in advance,
Rob
Edit: also, we are using Spring JMX

Answer 1

You shouldn't be using CompositeData directly even though the documentation sounds like you should. The MXBean will take care of converting a proprietary data type into a CompositeData instance and back automatically.
Take a look at the samples provided in the documentation to see how you should use #ConstructorProperties annotation to make your data type play nicely with composite data and MXBeans.
-JB-