Note: The following applies to managed COBOL only.
You can use any existing COBOL program in a multiple user environment in
Java. Do this as follows:
- Create a COBOL class library project and add your procedural COBOL program to that project.
- Rebuild the project.
Whether the COBOL program to be called is procedural or OO COBOL, you need a program to call it:
- Create a project for the calling program.
- In the calling program, create a run unit using the
com.microfocus.cobol.runtimeservices.RunUnit constructor.
- Use the
Try ... Finally syntax to ensure that the program destroys the run unit if the program fails.
- Either use the
RunUnit.Call() method to call the COBOL class, or:
- Make sure that any parameters are Java primitive data types.
- Create an instance of the procedural COBOL program to be called.
- Add the program instance to the new run unit, using the
RunUnit.Add() method.
- Invoke the program instance within the new run unit.
- Use the
StopRun()
method to destroy the run unit when you have finished with it.
Note:
- If the run unit causes a run-time error, a
java.lang.RuntimeException is thrown.
- In OO COBOL programs in a mixed language environment, do not use static methods and data as they cause run-time errors.
- Ensure that data access is synchronized, as the run units will be executing in different threads.
For details of the RunUnit class and further examples see the documentation about com.microfocus.cobol.runtimeservices - see the topic
com.microfocus.cobol.runtimeservices.
