IBM Mainframe Forum

[anandhakrishna]

Hi guys,

How to call java from C program in zOS. Got an info that jni.h would help this.

Kindly let me know how to proceed.

Thanks

[NicC]

By reading the relevant manual(s)? Once you have done that you can come back with any questions to clarify your understanding.

[mwilliams]

Well,
There is an interesting aspect with threads like this one.
I did a search on the internet on the very subject and the link to this thread pops up near to the very top of the search results.

As quick response, the Java Native Interface (JNI) provide the means of both extending Java with calls to native code (C, C++, etc) and embedding the Java virtual machine into native applications.

As for “calling java from C program in zOS”, may I suggest the following links:
http://enterprisesystemsmedia.com/article/the-java-native-interface-on-z-os

http://www.ibm.com/developerworks/java/tutorials/j-jni/section3.html

[claes_douglas]

JNI is not specific to z/OS, it is standarised and will be available everywhere Java is.

The thing that is specific to EBCDIC based OS's like z/OS is that you have to make the calls to Java using ASCII strings, so for instance use #pragma convert or iconv(), depending on your needs. Other than that, it's JNI as usual.