Oracle ADF Exception Handling – example
In my previous, ADF exception handling post, I have described how to catch an exception that is thrown inside a task flow. This post I am sharing about creating a custom Exception handler java class that will catch any unhandled exception thrown inside the ADF application. Using this we can catch any unhandled ADF exception, orlog the exception in a log file or delegate this exception to it successor. Basically, the custom exceptionHandler java class is extended to oracle.adf.view.rich.context.ExceptionHandler
In this example, I have created a bounded task flow with a view activity and method call activity. The view activity has a command button which calls the method action which throws a JBO exception. The exception will be caught in a custom exception class.
Download the ADFExceptionHandler
Let’s begin the example,
Create a custom ExceptionHandler class
Expand the view controller and create a java class the extends oracle.adf.view.rich.context.ExceptionHandler. Override the method handleException and write the exceptional logic, logger or delegation inside the method . I have used the facesmessage to display the error in a popup
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import javax.faces.application.FacesMessage; import javax.faces.context.FacesContext; import javax.faces.event.PhaseId; import oracle.adf.view.rich.context.ExceptionHandler; public class MyExceptionHandler extends ExceptionHandler { public MyExceptionHandler() { super(); } @Override public void handleException(FacesContext facesContext, Throwable throwable, PhaseId phaseId) throws Throwable { // TODO Implement this method String error = throwable.getMessage();; //Handle the error or log the error //throw throwable; //Log it FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_ERROR,error, null ); FacesContext.getCurrentInstance().addMessage(null, message); } } |
Register the Exception class
Open your ADF application in a file explorer, Go to .adf , META-DATA directory; Create a folder called ‘services’
Go into the ‘services’ directory and create a file called oracle.adf.view.rich.context.ExceptionHandler
Now open the JDeveloper, Refresh the application; Expand Application Resources, Description, ADF META-INF and check the services directory and file we created in the previous steps are visible.
Open the file Oracle.adf.view.rich.context.ExcepionHandler and input the ExceptionHandler java class
That’s it. We are done with creating custom exceptional handling class and register it .if any unhandled exception rises inside the app will get caught in the registered method .
You can skip the below steps if you understand the exceptional handler.
I have created a java class called ThrowException under view controller which has one method, which throws a JBO exception. Expose the method by right click on the class and select Generate Data controller.
Create a bounded task flow; Drop the exposed method from data control pallate to the task flow and drop a view activity. Using control flow case, drag a line from view to method call activity and mark it ‘toException’ as shown below. Create a JSFF page from the view activity
Open the view1.jsff page and drop a command button. The action of the button should be toException
Create an index.JSF page and drop the bounded task flow as a region activity; Run the page
On clicking on the method will call the method ‘throwException’ method which throws a JBO exception. The exception got caught by the custom exceptionalHandler class.
Govind
The views expressed on this blog are my personal views and do not necessarily reflect the views of my employer.
Please feeling free to reach me on any comments and feedbacks you have. Would be more than glad to listen and reply 🙂
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