How to call webservices function - java importer 6i -Duncan?

Question

I've imported methods of a webservice from salcentral following instructions in otn.
Now I need to figure out how to call the resulting function in forms
Here is the function, the pl/sql error is wrong number or type of arguments
Anyone done this and know how to get the function signature correct?
I want to call checkemail
PACKAGE BODY MXCheckerStub IS
-- DO NOT EDIT THIS FILE - it is machine generated!
cls ORA_JAVA.JCLASS;
fid ORA_JAVA.JFIELD;
mid ORA_JAVA.JMETHOD;
args JNI.ARGLIST;
-- Constructor for signature ()V
FUNCTION new RETURN ORA_JAVA.JOBJECT IS
BEGIN
cls := JNI.GET_CLASS('mypackage/MXCheckerStub');
mid := JNI.GET_METHOD(FALSE, cls, '<init>', '()V');
args := NULL;
RETURN (JNI.NEW_OBJECT(cls, mid, args));
END;
-- Method: CheckEmail (Lorg/w3c/dom/Element;)Ljava/util/Vector;
FUNCTION CheckEmail(
obj ORA_JAVA.JOBJECT,
a0 ORA_JAVA.JOBJECT) RETURN ORA_JAVA.JOBJECT IS
BEGIN
cls := JNI.GET_CLASS('mypackage/MXCheckerStub');
mid := JNI.GET_METHOD(FALSE, cls, 'CheckEmail', '(Lorg/w3c/dom/Element;)Ljava/util/Vector;');
args := JNI.CREATE_ARG_LIST(1);
JNI.ADD_OBJECT_ARG(args, a0, JNI.GET_CLASS('org/w3c/dom/Element'));
RETURN JNI.CALL_OBJECT_METHOD(obj, mid, args);
END;

Answer 1

I would try to take an aproach where I'll generate a stub for the WSDL in JDeveloper, and also write a
Java class that calls this stub and return a simple variable (String, int, or boolean).
Then I would call this class from Forms.
I believe this would make it easier.