Hello Gaurav,
the tool includes libraries from JBoss 5 (see the lib-directory). If you use JBoss 4, you should probably replace those libraries. But I don't know if the source code will then compile (JBoss 5 classes used in the tool may not exist in JBoss 4).
The error appears to originate in ServerQueueMon.java on the line
fireTableRowsUpdated(0, getRowCount()-1);
You can replace that with
fireTableDataChanged();
But that will probably not remove the cause of the error. Most of the data that the tool displays is retrieved using methods in JmsUtil.java
Try calling these methods from a test program. E.g. if JmsUtil.getQueueNames(InitialContext) returns an empty list, you probably found the cause of the problems.