- Through exception handling we can
designate an Activity as exception handler
-
For
the flow from the exception handling activity uses the standard exception
handling activity
-
You
can use router as exception handling activity and reaching the exception from
here it will can route to various control flow cases based on exception.
-
A
task flow can have only one exception handling activity
-
If
no exception handling mechanism provided the exception propagated to the top
level tf till the webcontainer
-
ADF
Model also provide exception handling mechanism. An exception thrown by any
type of binding is caught by the ADF Model which calls the reportException()
stores the exception in the binding container
-
Later
page renders error displays
Create a task flow below
For the testMeth1 activity attch the method as
#{pageFlowScope.handleException.exception}
View1.jspx
<jsp:root
xmlns:jsp="http://java.sun.com/JSP/Page" version="2.1"
xmlns:af="http://xmlns.oracle.com/adf/faces/rich">
<af:panelGroupLayout id="pgl1">
<af:button
text="button 1" id="b1" action="toMeth"/>
</af:panelGroupLayout>
</jsp:root>
testMeth1
#{pageFlowScope.handleException.exception}
The managed bean handleException
package view.test;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import oracle.jbo.JboException;
public class TestException {
public
TestException() {
super();
}
public void
exception() {
throw new JboException("test
here");
}
public void
exceptionMessage() {
System.out.println("Here");
try {
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);
} catch
(Exception e) {
e.printStackTrace();
}
}
public void
badCall() {
}
public String
badActionHere() {
System.out.println("Here...");
return
null;
}
}
Create a page to test by drag and drop the page as region
and run.Click on the button and you see the custom exception message.
