[SOLVED] ADF: calling a method at runtime

Hi all,
I have a method that I need to call (once) when the page loads, the method contains setting a whereClause of a ViewObject and setting the render property of some items to true/false.
I implemented the PagPhaseListener menthod's afterPhase() and beforePhase() but it did not work, I also tried "Using Custom ADF Page Lifecycle to Invoke an onPageLoad Backing Bean Method" way as explained in :
http://download-uk.oracle.com/docs/html/B25947_01/bcdcpal005.htm#sthref828
also did not work.
any suggestions?
Regards,
Ahmad Esbita

It seems that the PagPhaseListener's afterPhase() and beforePhase() way will not work unless you set the controller class of the page definition to the class implementing the PagPhaseListener.
Sorry for the mistake,
Ahmad Esbita

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Ankit Gupta

Hi Cvele, Timo,
Many thanks for the suggestions.
To avoid confusions, I have created a new application altogether. It seems that the method call is not being called when I run the page.
For your reference I have attached the task flow definition and method code below -
Task Flow Definition
<?xml version="1.0" encoding="windows-1252" ?>
<adfc-config xmlns="http://xmlns.oracle.com/adf/controller" version="1.2">
<task-flow-definition id="task-flow-definition">
 <default-activity id="__1">methodCall1</default-activity>
 <managed-bean id="__11">
 <managed-bean-name id="__13">TestBean</managed-bean-name>
 <managed-bean-class id="__10">TestBean</managed-bean-class>
 <managed-bean-scope id="__12">request</managed-bean-scope>
 </managed-bean>
 <view id="view1">
 <page>/view1.jspx</page>
 </view>
 <view id="exception">
 <page>/exception.jspx</page>
 </view>
 <method-call id="methodCall1">
 <method>#{requestScope.TestBean.checkURL}</method>
 <return-value id="__15">#{TestBean.checkURL}</return-value>
 <outcome id="__14">
 <to-string/>
 </outcome>
 </method-call>
 <control-flow-rule id="__2">
 <from-activity-id id="__3">methodCall1</from-activity-id>
 <control-flow-case id="__5">
 <from-outcome id="__6">go</from-outcome>
 <to-activity-id id="__4">view1</to-activity-id>
 </control-flow-case>
 <control-flow-case id="__8">
 <from-outcome id="__9">error</from-outcome>
 <to-activity-id id="__7">exception</to-activity-id>
 </control-flow-case>
 </control-flow-rule>
</task-flow-definition>
</adfc-config>
Method Code
public String checkURL() {
// Add event code here...
System.out.println("method activity called");
return "error";
Best Regards,
Ankit Gupta

Calling a method with parameters in jstl?

i need to call a method with a series of String parameters what am i doing wrong?
the java
 public ArrayList getEmployeeSkills(String ename, String snmae, String yearsexp)the jstl
 <jsp:useBean id="empskill" class="com.Database.EmployeeSkill"/>
 <c:forEach var="emp" items="${empskill.EmployeeSkills(null, null, null)}">
 </c:forEach>

this works:
 <jsp:useBean id="empskill" class="com.Database.EmployeeSkill" scope="page">
 <jsp:setProperty name="empskill" property="ename" value="Helen Smith"/>
 <jsp:setProperty name="empskill" property="sname" value="Java"/>
 </jsp:useBean>but this part isnt:
 <c:forEach var="empskill" items="${empskill.EmployeeSkillsReport}">
 </c:forEach>ive removed the get part from the method as i have done before from the java class it is calling:
public ArrayList getEmployeeSkillsReport()
but it produces:
org.apache.jasper.JasperException: Exception in JSP: /main.jsp:146
143: </jsp:useBean>
144:
145:
146: <c:forEach var="empskill" items="${empskill.EmployeeSkillsReport}">
147: </c:forEach>
148:
149:
Stacktrace:
 org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:506)
 org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
 org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
 org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
javax.servlet.ServletException: An error occurred while evaluating custom action attribute "items" with value "${empskill.EmployeeSkillsReport}": Unable to find a value for "EmployeeSkillsReport" in object of class "com.Database.EmployeeSkill" using operator "." (null)
 org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:843)
 org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:776)
 org.apache.jsp.main_jsp._jspService(main_jsp.java:244)
 org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)
 org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
 org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
javax.servlet.jsp.JspException: An error occurred while evaluating custom action attribute "items" with value "${empskill.EmployeeSkillsReport}": Unable to find a value for "EmployeeSkillsReport" in object of class "com.Database.EmployeeSkill" using operator "." (null)
 org.apache.taglibs.standard.lang.jstl.Evaluator.evaluate(Evaluator.java:109)
 org.apache.taglibs.standard.lang.jstl.Evaluator.evaluate(Evaluator.java:129)
 org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager.evaluate(ExpressionEvaluatorManager.java:75)
 org.apache.taglibs.standard.tag.el.core.ForEachTag.evaluateExpressions(ForEachTag.java:155)
 org.apache.taglibs.standard.tag.el.core.ForEachTag.doStartTag(ForEachTag.java:66)
 org.apache.jsp.main_jsp._jspx_meth_c_forEach_3(main_jsp.java:590)
 org.apache.jsp.main_jsp._jspService(main_jsp.java:232)
 org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)
 org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
 org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

Calling a method ---please help

Hi everyone, I'm new to the forums, and completely new to java,. I've been searching for hours (online and in books) on how to call a method while passing parameters. I still haven't figured it out. I'm sure it's really easy, but I need some help.
This program is for evaluating the quadratic formula. I can't seem to return x1 and x2 from lines 73 and 78 (labeled in code) from method quad to lines 39, 40, and 46. It will compile and run, but it will not display x1 and/or x2.
Please help, and thanks in advance.
Am I even close?
import java.util.*;
import java.lang.*;
import javax.swing.JOptionPane;
 public class test
 static Scanner console = new Scanner(System.in);
 public static void main(String[] args)
 //Declare variables
 double a = 0;
 double b = 0;
 double c = 0;
 double d = 0;
 //Asking the user for input
 inputA = JOptionPane.showInputDialog(null, "enter number for x^2");
 inputB = JOptionPane.showInputDialog(null, "enter number for x";
 inputC = JOptionPane.showInputDialog(null, "enter number for constant");
 //Parsing string to double
 a = Double.parseDouble(inputA);
 b = Double.parseDouble(inputB);
 c = Double.parseDouble(inputC);
 //calculating discriminant
 d = (Math.pow(b,2) - (4 * a * c));
 //Checking to see if the discriminant is less than zero - has two imaginary roots
 if (d < 0)
 JOptionPane.showMessageDialog(null, "There are two imaginary roots.");
 }//end checking to see if the discriminant is less than zero - has two imaginary roots
 //calling method quad
 if (d > 0)
 quad(a, b, c, 1); //line 39
 quad(a, b, c, 2); //line 40
 JOptionPane.showMessageDialog(null, "There are two real roots. They are root 1 = "
 + x1 + " , and root 2 = " + x2 + ".");
 else if (d == 0)
 quad(a, b, c, 1); //line 46
 JOptionPane.showMessageDialog(null, "There is a single (repeated) root. It is " + x1);
 //starting method quad
 public static double quad (double a, double b, double c, int n)
 double d = 0; //value for d - discriminant
 double x1 = 0; //value for x - solving for x
 double x2 = 0; //value for -x - solving for negative x
 //Checking if discriminant equals zero or is larger than zero
 if (d == 0)
 n = 1;
 else
 n = 2;
 //Checking if n equals zero
 if (n == 1)
 x1 = ((-b) + (Math.sqrt((Math.pow(b,2))-(4 * a* c))) / (2 * a));
 return x1; //line 73
 else
 x2 = ((-b) - (Math.sqrt((Math.pow(b,2))-(4 * a* c))) / (2 * a));
 return x2; //line 78
 }//end method quad

Man, you guys/gals are great! You notice everything...I sure appreciate all the help so far. I've updated a few things, but I still can't get x1 in the method to pass the right input to line 39. For instance, if I set a=2, b=4, and c=-30, then x1 should = 3 and x2 should =-5, but both keep showing -5. They are always equal for some reason, even when they are not supposed to be.
I see what you were saying with d always equalling zero. I was looking in the main where it doesn't always = zero, but in the method it was always set to zero. Thanks...good eye!
num1 = quad(a, b, c, 1); //line 39
num2 = quad(a, b, c, 2); //line 40
JOptionPane.showMessageDialog(null, "There are two real roots. They are root 1 = "+ num1 + " , and root 2 = " + num2 + ".");I also added this to the method so d won't always = zero
d = (Math.pow(b,2) - (4 * a * c));I also have all of the variables declared at the top, but I forgot to copy and paste all of them and I updated the System.exit(0) to close the JOptionPane along with extra } 's to close the program correctly.
Again, thanks a bunch.

Calling a method before entering a page

Hi,
What is the best way for calling a method before entering a page in ADF, when this page is the fist page that user in enter into it in Application, I mean there is not any other page before this page ( in this case I am able to call that method in task flow with method call).
Also, I want this method calls only one time....
Thanks.
Edited by: Amir Khanof on Jun 29, 2010 5:19 AM

Hi,
one option would be to add a method for the afterPhase property of the f:view component on a JSPX page and listen for the after restore phase. Then check if the request (you get this from the FacesContext) is a GET request, which indicates that the page was requested from the browser and not in the process of navigating in the application. If the conditions are true, access the method and execute it
Frank

Calling a method from abstarct class

Hi Experts,
Am working on ABAP Objects.
I have created an Abstract class - with method m1.
I have implemented m1.
As we can not instantiate an abstract class, i tried to call the method m1 directly with class name.
But it it giving error.
Please find the code below.
CLASS c1 DEFINITION ABSTRACT.
PUBLIC SECTION.
    DATA: v1 TYPE i.
    METHODS: m1.
ENDCLASS.                    "c1 DEFINITION
CLASS c1 IMPLEMENTATION.
METHOD m1.
    WRITE: 'You called method m1 in class c1'.
ENDMETHOD. "m1
ENDCLASS.                    "c1 IMPLEMENTATION
CALL METHOD c1=>m1.
Please tell me what is wrong and how to solve this problem.
Thanks in Advance.

Micky is right, abstract means not to be instantiated. It is just a "template" which you can use for all subsequent classes. I.e you have general abstract class vehicle . For all vehicles you will have the same attributes like speed , engine type , strearing , gears etc and methods like start , move etc.
In all subsequent classes (which inherit from vehicle) you will have more specific attributes for each. But all of these classes have some common things (like the ones mentioned above), so they use abstract class to define these things for all of them.
Moreover there is no sense in creating instance (real object) of class vehicle . What kind of physical object would vehicle be? there is no such object in real world, right? For this we need to be more precise, so we create classes which use this "plan" for real vehicles. So the abstract class here is only to have this common properties and behaviour defined in one place for all objects which will have these. Abstract object however cannot be created per se. You can only create objects which are lower in hierarchy (which are specific like car , ship, bike etc).
Hope this claryfies what we need abstract classes for.
Regards
Marcin

Call applet methods from Javascript

Hello,
If I call applet method like :
function callbackFunc(){
var pp = appletID.getData();
alert(pp);
It works only if applet is deployed with <APPLET> tag or with javascript.
If applet is deployed using <Object> and <embed> tags, in browser console the error is :
TypeError: appletID.getData is not a function
I couldn't find why is that behaviour. What do I do wrong?
Thanks

Hi Paul,
(1)Seems to be your Java Runtime Environment path is still setted for JRE 1.3.0_01 and not for 1.3.1. So pelase go to the
Control Panel-->java plugin 1.3.1-->Advanced. Here you set the Java Runtime Environment to the JRE 1.3.1 version. Its better to remove the older version before installing the new version on JRE.
(2)<OBJECT> tag won't work for Netscape. You can only use <APPLET> or <EMBED> tag for Netscape.
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Developer Technical Support
Sun Microsystems
http://www.sun.com/developers/support

URGENT: Catch a NoClassDefError within a method at runtime?

Hi there,
I have a Class A that creates an instance of Class B in method mA().
At compile time, Class A and B are both included in the CLASSPATH.
However, at runtime, Class B is removed from the CLASSPATH resulting in a NoClassDefError as expected.
NOTE: How do I gracefully handle a condition wherein I can dynamically catch this NoClassDefError? According to the javadoc, a NoClassDefError is thrown by the JVM or by the ClassLoader instance?
Hence, I have...
class A
void mA()
try {
B b = new B();
} catch (Throwable th)
System.out.println("Gracefully caught exception");
th.printStackTrace();
Note: Upon execution of (new A()).mA(), I get a console message...
Exception in thread "xyz" java.lang.NoClassDefFoundError: B
(This was probably displayed by the JVM)
This is NOT what I wanted.
I was hoping to have this gracefully caught in my try catch block.
I have the following restrictions...
1. The instance of B cannot be created using reflection. This is user code written within my application and I cannot tell him how to write code due to Java's limitation of not being able to catch a NoClassDefError at runtime.
2. I cannot use a custom class loader to detect a failure in loading this class because this application is expected to work in multiple environments containing variable parent class loader definitions.
How do I do this?

That exception is the result of loading a class not
calling any methods (including the constructor.)I definitely agree :-)
... and the class being loaded is class B. Now, my
point was that maybe the B class isn't loaded when
mA() is called, but rather when the first A is
created. (Which would load class A, which might
possibly trigger loading class B).I believe the spec disallows throwing an exception when the class is loaded for an instance that exists solely in a method. The reality of this is that it is much easier for VMs not to resolve classes until the method actually runs.
However, it can resolve it in the method any place it wants - like before try block starts executing. You can test this by creating a second method that actually calls B. Then wrap that method call in a try block inside of the constructor.

Call C# method from javascript in WebView and retrieve the return value

The issue I am facing is the following :
I want to call a C# method from the javascript in my WebView and get the result of this call in my javascript.
In an WPF Desktop application, it would not be an issue because a WebBrowser
(the equivalent of a webView) has a property ObjectForScripting to which we can assign a C# object containg the methods we want to call from the javascript.
In an Windows Store Application, it is slightly different because the WebView
only contains an event ScriptNotify to which we can subscribe like in the example below :
void MainPage_Loaded(object sender, RoutedEventArgs e)
this.webView.ScriptNotify += webView_ScriptNotify;
When the event ScriptNotify is raised by calling window.external.notify(parameter), the method webView_ScriptNotify is called with the parameter sent by the javascript :
function CallCSharp() {
var returnValue;
window.external.notify(parameter);
return returnValue;
private async void webView_ScriptNotify(object sender, NotifyEventArgs e)
var parameter = e.Value;
var result = DoSomerthing(parameter);
The issue is that the javascript only raise the event and doesn't wait for a return value or even for the end of the execution of webView_ScriptNotify().
A solution to this issue would be call a javascript function from the webView_ScriptNotify() to store the return value in a variable in the javascript and retrieve it after.
private async void webView_ScriptNotify(object sender, NotifyEventArgs e)
var parameter = e.Value;
var result = ReturnResult();
await this.webView.InvokeScriptAsync("CSharpCallResult", new string[] { result });
var result;
function CallCSharp() {
window.external.notify(parameter);
return result;
function CSharpCallResult(parameter){
result = parameter;
However this does not work correctly because the call to the CSharpResult function from the C# happens after the javascript has finished to execute the CallCSharp function. Indeed the
window.external.notify does not wait for the C# to finish to execute.
Do you have any solution to solve this issue ? It is quite strange that in a Window Store App it is not possible to get the return value of a call to a C# method from the javascript whereas it is not an issue in a WPF application.

I am not very familiar with the completion pattern and I could not find many things about it on Google, what is the principle? Unfortunately your solution of splitting my JS function does not work in my case. In my example my CallCSharp
function is called by another function which provides the parameter and needs the return value to directly use it. This function which called
CallCSharp will always execute before an InvokeScriptAsync call a second function. Furthermore, the content of my WebView is used in a cross platforms context so actually my
CallCSharp function more look like the code below.
function CallCSharp() {
if (isAndroid()) {
//mechanism to call C# method from js in Android
//return the result of call to C# method
} else if (isWindowsStoreApp()) {
window.external.notify(parameter);
// should return the result of call to C# method
} else {
In android, the mechanism in the webView allows to return the value of the call to a C# method, in a WPF application also. But I can't figure why for a Windows Store App we don't have this possibility.

[SOLVED] ADF: calling a method at runtime

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