Global Exception Handler for ADF Task Flow Method Calls

Exception Handler is the central point for handling unexpected Exceptions that are thrown during the Faces lifecycle.
ADF Task Flow provides this facility, using this you can handle all exception that raised in TaskFlow methods.
here i am using ADF bounded TaskFlow with page fragments(.jsff) .
Developers must use this facility to avoid unexpected exception inside taskflows.

This is very simple approach , you have to do nothing more but create a method in Task Flow and mark it as Exception Handler and write your code inside this method , that you want to show when any exception is caught in TaskFlow.

To implement this i have implemented this scenario-

• Create a method that throw an Exception and add it to taskFlow, and on page call this method on button click


public void exception() {
throw new JboException("Failded to load");
}

• When we click on button that call exception() method ,JboException is raised inside TaskFlow and look like this- Your page crashed

• Now create a method that will behave as ExceptionHandeler  and add it to TaskFlow and mark as Exception Handeler (Symbol in Jdev toolbar for marking)


public void exceptioHandeler() {
System.out.println("Inside Handeler");
FacesMessage message = new FacesMessage("This is custom Message for Jbo Exception-Exception Handeler");
message.setSeverity(FacesMessage.SEVERITY_WARN);
FacesContext fc = FacesContext.getCurrentInstance();
fc.addMessage(null, message);

}

• Use this sign to mark method as Exception Handeler in bounded Task Flow

• Now Run your page and click on button that call exception() method, your page never crash, as there is handler

Find Sample application Download Sample ADF Application

Currency- A Java Utility, Get currency code , symbol using Locale in Java

Java provides utility classes inside java.util package.

java.util.Currency is very interesting class in this package,it represents currencies defined in ISO 4217 by 

their currency codes.

You can get currency codes, its symbol, default fraction digits using its method.

java.lang.Object
  java.util.Currency 

see this short example , how we use Currency Class in Java,You can also get 

live currency fluctuation in java using Currency Converter API

package practiceJava;

import java.util.Currency;
import java.util.Locale;

public class CurrencyDemo {

    public static void main(String[] args) {
        // create a currency object with  locale
        Locale locale = Locale.US;
        Currency curr = Currency.getInstance(locale);
        System.out.println("Locale's currency code:" + curr.getCurrencyCode());
        // Get symbol for Currecny
        String symbol = curr.getSymbol();
        System.out.println("Symbol is :" + symbol);
        // Get default fraction digit for Currecny
        int frDigit = curr.getDefaultFractionDigits();
        System.out.println("Default fraction digit : " + frDigit);

    }
}

Output look like this

Inline PopUp with noteWindow (Excellent feature) in Oracle ADF

A very good and flexible component in adf is af:popup. we can use popup in various ways.
Suppose sometimes we need to show short description or some detail about any text ,button on Mouse Hover, then we can use inline PopUp (excellent look and feel)

For this you have to follow these steps-

• Create a page in your bounded taskflow, drag an output text in page for that we are going to show Short Description.
• Drag n drop a pop component in page in which we show description for that output text

• Now drop a noteWindow under popup component 

•  and write your description in source of .jsff page in notewindow component

<af:popup childCreation="deferred" autoCancel="disabled" id="p1">
      <af:noteWindow id="nw1" inlineStyle="width:200px;" autoDismissalTimeout="5">
                       <p><b>Penguins</b> <b><font color="maroon">(order Sphenisciformes, family Spheniscidae)
                       are a group of aquatic, flightless birds living almost
                       exclusively in the southern hemisphere, especially in
                       Antarctica.</font></b> <b><font color="Green"> adapted for life in the water, penguins
                       have countershaded dark and white plumage, and their wings
                       have evolved into flippers</font></b></p>
      </af:noteWindow>
    </af:popup>

• Drag showPopupBehavior inside output text for that you have to show that popUp

• Now pass popup id in showPopupBehavior and set trigger type to mouseHover 

• Run your page and see how it look-- It is just awesome
  
  
   
  And this is very good that you can show graphs, tables and other information on this type of inline popUp 
  You can find sample application here- Download Sample Application