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  1.  Home
  2. JAVA400-L
  3. February 2020

Re: Call system API from Java

On 2020-02-24 11:44 a.m., Pete Helgren wrote:
There really isn't any particular reason, it just seems like "native" is the better way to go, especially if I can 1) Learn something new and 2) If the effort isn't a whole lot more than using JT400.

I have done a bit of JNI stuff in Windows/Linux and with wasn't too hairy.  Just wondered about IBM i and doing the same.


To use JNI for calling from Java, you'd need a native method on the native side.

It's pretty easy to write a native method in RPG. You just need to code your EXTPROC with *JAVA and the class name:
EXTPROC(*JAVA : 'MyClass' : MyMethod)

And you need to create the Java class to tell Java about where the native method is.

https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_74/rzasc/callnatmeth.htm

There's no support for data structure parameters, so depending on what you wanted from the API, you might need a lot of parameters.


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