JMX - monitor complex attribute of MBean

Question

I have a simple third party object - a DTO with about 10+ public fields only (it get filled as an atomic operation). I would like to be able to monitor it in JConsole without writing a lot of boilerplate code.

I tried to:

• Use MXBean - got an exception (NotCompliantMBeanException)
• Convert the DTO to String using reflection-based utility library like apache.common.lang3.ReflectionToStringBuilder - works, but does not look good since JConsole does not support multi-line strings well, plus it is not efficient.

Any other suggestions?

Answer 1

It would be helpful if you posted you failing MXBean code. Typically, you would just need to define a DTOMXBean interface, make the DTO implement it and then register the DTO. (It sounds like a weird lifecycle for a DTO since they're usually fairly transient, but that's a topic for a different question).

Keep in mind that the MXBean attributes should not return values of types not defined in javax.management.openmbean.OpenType.ALLOWED_CLASSNAMES_LIST , otherwise you will get a NonCompliant exception. If you must expose types that cannot be represented as one of those types, you will need to define new composite types to expose them as.