COBOL/Java interoperability

Enterprise COBOL provides two directives, JAVA-CALLABLE and JAVA-SHAREABLE, that facilitate interoperability between COBOL programs and Java programs.

JAVA-CALLABLE
The JAVA-CALLABLE directive instructs the compiler to make the COBOL program automatically callable from Java™. When a COBOL program that is callable from Java is compiled, a program referred to as a native method call stub program is automatically generated by the compiler. This program is an interface between the Java caller and the user COBOL program. When the call stub program receives control from Java, it performs conversion of incoming argument values to their corresponding COBOL format and then dynamically calls the user COBOL program, which must be located by the application's STEPLIB. If the user program returns a value, then that value is converted to its corresponding Java format before the call stub returns.
JAVA-SHAREABLE
Use the JAVA-SHAREABLE ON and JAVA-SHAREABLE OFF directives to bracket one or more WORKING-STORAGE data items to indicate that they are to be made read/write accessible from Java applications interoperating with this COBOL program.
Mapping between COBOL and Java data types for non-OO COBOL/Java interoperability
This section describes the COBOL data types and related Java data types in non-OO COBOL programs that interoperate with Java through use of the JAVA-CALLABLE or JAVA-SHAREABLE directives or through use of the CALL statement to call a static Java method.

Parent topic: Compiler directives