Description:
This is related to how to find the total number of receiver counts on specific queues.

You can do this in two ways.

1). An external command palate.
2). JAVA code activity.
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1). Using an external command activity you can issue a command to show the details of the JMS Queue with the help of an EMS command/script. You can execute the commands using an external command.

Usage: Provide the path of a batch file into an external command.
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Make a batch file containing the following: 

cd C:\tibco\ems\7.0\bin
tibemsadmin.exe -server tcp://localhost:7222 -user admin -password password -script C:\cmds.script

Create a shell script file containing: show queue MyQueue;
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2). Using Java code activity you can implement the EMS Admin API. In the Admin API there is a package named 'com.tibco.tibjms.admin' containing the class 'QueueInfo' which has a method 'getReceiverCount()' whose function is: "Get the number of active receivers on this queue."
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How to find the number of receivers on any queue.

tibco doc