Implementing java beans in forms 10g [Problem]

Question

Hi All,
I am trying to implement the java bean in the forms 10g
I performed the following steps, but no luck.. Could anybody please help me in this?
I have created a simple java class
package mypackage1;
public class MyClass
public String GetString(String a)
return a;
Make a jar myjar.jar out of it.
Copy this jar files in $ORACLE_HOME/forms/java directory
and set the archive.jini parameter in formsweb.cfg to
archive_jini=frmall_jinit.jar,Myjar.jar
Created a simple form having one button, one textbox
Set the implementation class property of text item to mypackage1.MyClass
on button pressed trigger, I wrote
set_custom_property('block2.text_item4',1,'GetString','Hello World');
Ideally, on button pressed, it should show the text "Hello World" in the etxt box. But on button pressed nothing is happening and in java console on error is appearing.
My java console output is
Loading http://asst104253:8889/forms/java/frmall_jinit.jar from JAR cache
Loading http://asst104253:8889/forms/java/Myjar.jar from JAR cache
proxyHost=null
proxyPort=0
connectMode=HTTP, native.
Forms Applet version is : 10.1.2.0
Could anyone please tell me what I am doing wrong?? And how do I achieve this functionality??
Please, any help appreciated !!

Answer 1

Hi there
The is plenty wrong with this code:
1. MyClass is not extending VBean
2. There is no public boolean setProperty(ID ID, Object args) method and no property IDs have been defined so set_custom_property('block2.text_item4',1,'GetString','Hello World'); will not execute anything
3. If you're hoping to return values back from the bean, you need to define a custom event and associated ID.
If you're just looking for some java code to return values in a similar manner as normal Oracle functions then you may want to consider using forms java stored procedures which are based on static java methods. Beans are really more for interaction type stuff with other applications.
But any way if you want to do it this way (i.e. using beans) then at very least you class should look something like (Note, I have not compiled is so there may be a few errors):
package mypackage1;
import oracle.forms.handler.IHandler;
import oracle.forms.ui.CustomEvent;
import oracle.forms.properties.ID;
import oracle.forms.ui.VBean;
import oracle.forms.engine.Main;
import oracle.forms.engine.*;
import oracle.forms.handler.*;
public class MyClass extends VBean
// initiating event id
protected static final ID pgetString = ID.registerProperty("GetString");
// return value id
private static final ID preturnValue = ID.registerProperty("returnValue");
// return event id
protected static final ID preturn = ID.registerProperty("returnEvent");
static IHandler mHandler;
public String GetString(String a)
// may do some string manipulation here.
return a;
public boolean setProperty(ID ID, Object args)
if (_ID== pgetString)
if (_args instanceof String)
String myArg = (String)_args;
mHandler.setProperty(preturnValue,getString(myArg));
CustomEvent ce = new CustomEvent(mHandler, preturn);
dispatchCustomEvent(ce);
Keep your button as is and then to return the value back into forms place a WHEN-CUSTOM-ITEM-EVENT trigger on the bean area with something like this:
DECLARE
     BeanValListHd1 PARAMLIST;
     ParamType NUMBER;
     EvenName     Varchar2(20);
     CurrentValue Varchar2(2000);
BEGIN
     BeanValListHd1 := get_parameter_list(:SYSTEM.CUSTOM_ITEM_EVENT_PARAMETERS);
     IF :SYSTEM.Custom_Item_Event = 'returnEvent' THEN
          IF iD_NULL(BeanValListHd1) THEN
          MESSAGE('NO PARAMETER FOUND FOUND');     
          ELSE
          GET_PARAMETER_ATTR(BeanValListHd1,'returnValue',ParamType,CurrentValue);
          MESSAGE('IN CUSTOM EVENT THE STRING RETURNED IS '|| CurrentValue);
          END IF;
     ELSE
          MESSAGE('no value');
     END IF;          
END;
hope this helps
Q