Failed to get s session to MySQL cluster (no replies)

Hi experts,

I'm new to MySQL, I want to use ClusterJ to access database in MySQL cluster.

I got the following error when I tried to get a session from cluster:
Exception in thread "main" com.mysql.clusterj.ClusterJFatalUserException: Error getting connection to cluster with properties {com.mysql.clusterj.connectstring=127.0.0.1:1186, com.mysql.clusterj.database=geodb}:
Caused by com.mysql.clusterj.ClusterJDatastoreException:Datastore exception on connectString '127.0.0.1:1186' nodeId 0; Return code: -1 error code: 1,101 message: Error: Could not alloc node id at 127.0.0.1 port 1186: No free node id found for mysqld(API)..
at com.mysql.clusterj.core.SessionFactoryImpl.createClusterConnection(SessionFactoryImpl.java:252)
at com.mysql.clusterj.core.SessionFactoryImpl.createClusterConnectionPool(SessionFactoryImpl.java:226)
at com.mysql.clusterj.core.SessionFactoryImpl.<init>(SessionFactoryImpl.java:174)
at com.mysql.clusterj.core.SessionFactoryImpl.getSessionFactory(SessionFactoryImpl.java:129)
at com.mysql.clusterj.core.SessionFactoryServiceImpl.getSessionFactory(SessionFactoryServiceImpl.java:36)
at com.mysql.clusterj.core.SessionFactoryServiceImpl.getSessionFactory(SessionFactoryServiceImpl.java:27)
at com.mysql.clusterj.ClusterJHelper.getSessionFactory(ClusterJHelper.java:69)
at com.mysql.clusterj.ClusterJHelper.getSessionFactory(ClusterJHelper.java:54)

I found the http://forums.mysql.com/read.php?25,518259,518358#msg-518358 maybe related to this. But I don't know how to resolve this issue.

Can someone tell me how to resolve this issue? e.g. some example?

Thanks a lot.