Re: Problem in defining a Java method for RPG/ILE

On 2010/10/26 7:12 PM, Marvin Radding wrote:

public static byte[] toByteArray(InputStream stream)

I have defined it in RPG/ILE as

D toByteArray...
D pr 4096a
D extproc(*java
D :'org.apache.poi.util.IOUtils'
D :'toByteArray')

Besides the missing parameter that Scott mentioned, you're missing the STATIC keyword on the RPG prototype to match the static keyword for the Java method.

D toByteArray...
D pr 4096a static
D extproc(*java
D :'org.apache.poi.util.IOUtils'
D :'toByteArray')
D stream o class(*java ...)

For a non-static method, you have to pass an object "instance" of the method's class when you call the method. In Java, you would code like this to call a method on a particular object instance:
myObjInstance->toByteArray(parm);
In RPG, you code the object instance as the first parameter on the call. So you apparently pass one more parameter than is coded in the prototype.
toByteArray(myObjInstance : parm);

For a static method, the method is not instance-specific, so the RPG call requires has the same number of parameters as are coded in the prototype.

So when you didn't have either STATIC nor the parameter before, the RPG compiler expected one parameter. When you added the parameter to the prototype but not the STATIC keyword, the RPG compiler expected two parameters. If you add the STATIC keyword, the RPG compiler will again expect just one parameter.