Generating proxies for Java classes

You need to develop PowerBuilder proxies for the Java classes you want to invoke from PowerBuilder. You can develop proxies using Java reflection, from Java source code directly, or using the javap tool. For example, suppose you want to invoke this Java class:

public class Converter
{
public double dollarToYen(double dollar);
public double yenToEuro(double yen);
}

The PowerBuilder proxy for this Java class could be stored in a file called converter.srx that looks like this:

$PBExportHeader$converter.srx
$PBExportComments$Proxy generated for Java class
 
global type Converter from nonvisualobject
end type
global Converter Converter
 
forward prototypes
  public:
function  double dollarToYen(double ad_1) alias 
   for "dollarToYen,(D)D"
function  double yenToEuro(double ad_1) alias
   for "yenToEuro,(D)D"
end prototypes

Notice that both PowerBuilder proxy methods have an alias containing the Java method name and method signature. This is necessary because Java is case sensitive, but PowerBuilder is not. The extension uses the alias information is used by the extension to find the corresponding Java methods.

To add the proxy to a PowerScript target, select the library where the proxy will be stored in the System Tree, select Import from the pop-up menu, and browse to select converter.srx.