Exception Handling While Developing GWT Enterprise Application

Online, May 22, 2012 (Newswire.com) - [url: http://www.spec-india.com/services/java-j2ee-struts-development.htm] Google Web Toolkit (GWT) [/url]
is a set of open source tools used to design and develop complex web applications. The basic objective of GWT is to enable Java developers to build high performance web applications without being an expert in web development. While developing any application developers come across many exceptions, which need to be handles efficiently in order to shop application from crashing. Exception handling is a process of handling certain events or errors that arise when an application is running and it becomes a big challenge while working on an enterprise level application. So it is very necessary to have a common mechanism to handle exception, when the application is big and lots of people are working on it simultaneously. There are different ways of handling this exception in various platforms.

While developing any GWT enterprise application you basically will need to handle 2 types of exceptions.
• GWT code exception
• RPC call exception

In this article we will discuss how to handle GWT Code Exception. To handle this exception while programming, you need to follow below mentioned steps.
• Create a class according to the naming standards followed in your GWT side coding. For example we call this class CommonExceptionHandler.
• This class will extend com.google.gwt.core.client.GWT.UncaughtExceptionHandler class.
• Now we need to overwrite below mentioned method in that class
@Override
Public void onUncaughtException(Throwable caught)
{
}
• Now write the code that you want to execute when the exception is caught in your application.
• To register this call as an exception handle class, you will require opening the GWT Entry point call of the application.
• Go to onModuleLoad() method in Entry point class
• Now put the below mentioned statement as first statement in onModuleLoad() method.
GWT.setUncaughtExceptionHandler(new CommonExceptionHandler ());

These are the few simple steps for handling exception in your GWT application. So now whenever an exception comes, it will be routed to onUncaughtException() method. Hope these details about GWT exception handling will come handy while developing a GWT based web application.

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