ConversionErrorInterceptor adds conversion errors from the ActionContext to the Action's field errors.
This interceptor adds any error found in the {@link ActionContext}'s conversionErrors map as a field error (provided that the action implements {@link ValidationAware}). In addition, any field that contains a validation error has its original value saved such that any subsequent requests for that value return the original value rather than the value in the action. This is important because if the value "abc" is submitted and can't be converted to an int, we want to display the original string ("abc") again rather than the int value (likely 0, which would make very little sense to the user).
Interceptor parameters: Extending the interceptor: Because this interceptor is not web-specific, it abstracts the logic for whether an error should be added. This allows for web-specific interceptors to use more complex logic in the {@link #shouldAddError} method for when a valuehas a conversion error but is null or empty or otherwise indicates that the value was never actually entered by the user.
Example code: <action name="someAction" class="com.examples.SomeAction"> <interceptor-ref name="params"/> <interceptor-ref name="conversionError"/> <result name="success">good_result.ftl</result> </action>
@author Jason Carreira