It all depends on how many services your application(s) using. For example, if your application is updating a database and calling a service such as for address validation using web service and also using MQ to send a message for the custom java program you need 3 connectors. (JDBC, webservices and MQ connector) if you are using ICS.
Get more information from you project manager and analyze what calls your application should make and get the conclusion. Read the adatper section given in the Help.
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