How To Fix Glassfish’s Exception “only one instance running in the cluster”

Recently ive met a new exception on my Glassfish 3.1 log file, here is the complete stack trace

Skipped Loading of 396544c17b8bbbc620000f9b2196 since there is only one instance running in the cluster.|#]

Because of this error, somehow im unable to do a session failover on my Glassfish.

Using asadmin get-health show that my instance are both healthy and alive

glassfish3>asadmin get-health
Enter the value for the clusterName operand> cluster1
instance1 started since Thu Oct 09 16:43:21 ICT 2014
instance2 started since Thu Oct 09 16:45:40 ICT 2014
Command get-health executed successfully.

but both instances started not at the same time.

So what i do is very simple, i restarted my cluster so both of my instances started at the same time. And somehow, my error is gone and i can do failover seamlessly.

restart glassfish cluster

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