Building a mixed COBOL-Java application that starts with COBOL

A COBOL class definition that has a main factory method meets this requirement; therefore, you can use a main factory method as the first routine of a mixed COBOL and Java application under IMS.

Enterprise COBOL generates a Java class with a main method, which the Java dependent region can find, instantiate, and invoke. Although you can code the entire application in COBOL, you would probably build this type of application to call a Java routine. When the COBOL run time runs within the JVM of a Java dependent region, it automatically finds and uses this JVM to invoke methods on Java classes.

The COBOL application should use DL/I calls for processing messages (GU and GN) and synchronizing transactions (CHKP).