Examples for Chapter 7 - RESTful Java with JAX-RS 2.0 - page 294

current . setLastName ( update . getLastName ());
current . setStreet ( update . getStreet ());
current . setState ( update . getState ());
current . setZip ( update . getZip ());
current . setCountry ( update . getCountry ());

}

}

In ex06_1 , our getCustomer() and updateCustomer() methods threw a
javax.ws.rs.WebApplicationException . We've replaced this exception with our own
custom class, CustomerNotFoundException :
src/main/java/com/restfully/shop/services/CustomerNotFoundException.java

public public class class CustomerNotFoundException CustomerNotFoundException extends extends RuntimeException

{

public public NotFoundException ( String s )

{

super super ( s );

}

}
There's nothing really special about this exception class other than it inherits from
java.lang.RuntimeException . What we are going to do, though, is map this thrown ex-
ception to a Response object using an ExceptionMapper :
src/main/java/com/restfully/shop/services/CustomerNotFoundExceptionMapper.java

@Provider
public

public class class NotFoundExceptionMapper NotFoundExceptionMapper

implements implements ExceptionMapper < CustomerNotFoundException >

{

public public Response toResponse ( NotFoundException exception )

{

return return Response . status ( Response . Status . NOT_FOUND )

. entity ( exception . getMessage ())
. type ( "text/plain" ). build ();

}

}

When a client makes a GET request to a customer URL that does not exist, the CustomerRe-
source.getCustomer() method throws a CustomerNotFoundException . This exception is
caught by the JAX-RS runtime, and the NotFoundExceptionMapper.toResponse() method
is called. This method creates a Response object that returns a 404 status code and a plain-
text error message.