Re: Calling Java from RPG take 2

On 2012/9/19 4:47 PM, Dean Eshleman wrote:

String tokenValue = cincom.eloquence.exits.gsm.token. UniversalToken.
getUniversalToken(Mykey, expireMinutes)
...
What I am struggling with is how do I move data between a Java string
variable and an RPG character variable?

You'd use the String constructor to create a Java string from an RPG character variable, and you'd use the getBytes method from the Java String class to get the Java string data into an RPG character variable.

The RPG/Java trouble-shooting guide http://ibm.biz/BdxjTE, in the RPG Cafe, has the code for a program JAVAPROP that has something very similar to what you would be doing.

It's calling Java method
String System.getProperty (String);
so it has to build the String parameter, and then get the value back from the returned value.

beginObjGroup (env : 100);
str = newString (prop);
str = getProperty (str);
if str = *null;
result = 'That property was not found';
else;
result = getBytes (str);
endif;
endObjGroup (env);

The RPG Cafe also has a savefile with source for the JNI utilities in the ILE RPG Programmer's Guide, to make it easy to call JNI functions like BeginObjGroup and endObjGroup which are essential for enabling Java garbage collection. Find the article called "JNI utilities from the RPG Programmer's Guide" in the left-hand navigation of the wiki that you'll get to from the trouble-shooting link.