When to create and use custom convertors?,MyFaces,Apache MyFaces,Richfaces,MVC Framework,Struts 2.0 vs JSF,Struts and JSF,Spring and JSF,Hibernate and JSF

When to create and use custom convertors?

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The main reasons behind creating our converter are :
1. When we want to convert a component's data to a type other than a standard type
2. When we want to convert the format of the data.
What are the steps of creating and using custom converter in our application?
Creating and using a custom converter requires the following steps :

Steps to follow :
1. Create a class that implements javax.faces.converter.Converter interface.
2. Import necessary packages and classes.
3. Implement two abstract methods "getAsObject()", "getAsString()" provided by Converter interface. getAsObject() method converts the String (User Input) to Object and getAsString() method converts the Object to String to send back to the page.
4. Register the converter class in configuration file (faces-config.xml) adding <converter> element. This element has child elements <converter-id>(name of the converter to be used while programming )and <converter-class>( name of the converter class which we have created).
5. Create view page where <f:converter> tag is used with attribute "converterId" which specifies the name of the converter which we have specified in <converter-id> element of <converter> element in "faces-config.xml" file.
6. Use <h:message> tag to display the error message.

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