Resolution:
For instance, to run one adapter instance on service 7510 and one on 7520.
You need to do the followings:
1. Verify that your instance's session service parameter is set to
     %%RvService%% (a configured global variable) using Designer
2. Specify the service parameter on the command line, i.e. run the first adapter instance with "-system:clientVar RvService=7510" and the other with "-system:clientVar RvService=7510"
3. Or you can specify the service parameter in the Command Properties File, details please refer to the Command Properties File Format section in the TIBCO Adapter SDK Concepts.