While working with MySQL Cluster, i was looking for a monitoring framework for the cluster.
i came across a library @ https://launchpad.net/ndb-bindings – which had java and other connectors to NDB, the library was a wrapper of the existing C++ NDB Api.
This library allowed me to connect to the management node , get the state of the cluster and get real time notifications about heartbeat misses/node disconnections.
The library error-ed out on some conditions, with a small fix, it can work with MySQL Cluster 7.3.
https://github.com/jaihind213/mysql-cluster-ndb-bindings
I have listed down steps for compilation and running a sample program at github