ADF Exception Handling

Custom Exception Handlers can be used to suppress or alter exception reporting.

1. Model Layer

Extending  DCErrorHandlerImpl.
http://docs.oracle.com/cd/B31017_01/web.1013/b25947/web_val008.htm

1.Create class by extending DCErrorHandlerImpl.
2.Update DataBindings.cpx
<Application xmlns="http://xmlns.oracle.com/adfm/application" version="11.1.2.60.17" id="DataBindings"
             SeparateXMLFiles="false" Package="view" ClientType="Generic"
             ErrorHandlerClass="view.exception.MyCustDcExceptionHandler">
3. Handle,Extend or Skip Exceptions by overriding method
    public void reportException(DCBindingContainer dCBindingContainer,
                                Exception exception)

Got error

oracle.jbo.JboException: JBO-29000: Unexpected exception caught: java.lang.InstantiationException, msg=view.exception.MyCustDcExceptionHandler

    public MyCustDcExceptionHandler(boolean b) {

        super(b);
    }

Change To

    public MyCustDcExceptionHandler() {
        super(true);
    }

To customize known error message
@Override
public String getDisplayMessage(BindingContext ctx, Exception ex) {
String message="";
if (ex instanceof oracle.jbo.ValidationException) {
String msg = ex.getMessage();
int i=msg.indexOf("JBO-25013");//When JBO-25013 Too many object match primary key exception occur.
if(i>0)
{
message= "Duplicate Employee Id Found.";
}
message= getDisplayMessage(ctx,ex);
}
else
{
message=getDisplayMessage(ctx,ex);
}
return message;
}


References
http://adfwithejb.blogspot.com/2012/05/exception-handling-in-adf-part-1.html
http://deepak-adf.blogspot.com/2014/01/adf-exception-handling-taskflow.html
http://www.adftutorials.com/adf-custom-error-handler-to-display-custom-message-to-user.html
http://www.jobinesh.com/2011/03/customizing-business-components-error.html
http://ramannanda.blogspot.com/2011/11/error-handling-in-adf.html

2.Task Flow Exception Handler

References
http://fortunefusionminds.blogspot.com/2013/08/how-to-handles-exceptions-in-adf.html
http://andrejusb.blogspot.com/2010/05/handling-exceptions-in-oracle-ui-shell.html
http://biemond.blogspot.com/2008/10/reusable-adf-task-flow-exception.html
http://multikoop.blogspot.com/2014/02/adf-handling-exceptions-from_14.html


Handling Exception at adfc-config
http://multikoop.blogspot.com/2014/02/adf-handling-exceptions-from_14.html

  public void handleExceptionShowMessageInPopupDialog() {

    ControllerContext cc = ControllerContext.getInstance();

    Exception ex = cc.getCurrentViewPort().getExceptionData();

    String message = ex.getMessage();

    FacesContext fc = FacesContext.getCurrentInstance();

    FacesMessage facesMessage =

      new FacesMessage(FacesMessage.SEVERITY_ERROR, "UTF: " + message, null);

    fc.addMessage(null, facesMessage);

    cc.getCurrentRootViewPort().clearException();

    fc.renderResponse();

  }

3.Controller Exception Handler

1)Create a Java class that extends ExceptionHandler
2)Create folder .adf\META-INF\services and add file with the name oracle.adf.view.rich.context.ExceptionHandler. Save with no extension.
Under .adf\META-INF\services File Type should be EXCEPTIONHANDLER File.
3)In the file, add the absolute name of your custom exception handler class (package name and class name without the “.class” extension)
eg.
com.exchandl.view.ArCustomExceptionHandler



References
https://blogs.oracle.com/jdevotnharvest/entry/extending_the_adf_controller_exception_handler
http://www.yenlo.nl/nl/adf-11g-handling-the-adfc-12000-controllerexception-with-custom-exception-handling/
http://ramannanda.blogspot.com/2013/04/adf-exception-handling-scenario.html


ADF Errors
http://jneelmani.blogspot.com/2012/02/erroradf.html


Trace
http://marxsoftware.blogspot.com/2008/09/surprisingly-simple-stacktraceelement.html
http://marxsoftware.blogspot.com/2010/10/reading-java-stack-traces-few-tips.html
public static String accessExceptionStackTraceViaPrintWriter(final Throwable throwable)
   {
      final Writer writer = new StringWriter();
      final PrintWriter printWriter = new PrintWriter(writer);
      throwable.printStackTrace(printWriter);
      return writer.toString();
   }