RESTful Web services - Exception Handling

SampleExceptionHandlingResoruce.java


package per.sample.rest.service;

import javax.websocket.server.PathParam;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

import per.sample.rest.exception.CustomException;

@Path("/exception")
public class SampleExceptionHandlingResoruce {

@GET
@Path("{name}")
@Produces(MediaType.TEXT_PLAIN)
public String sayHello(@PathParam("name") String name) {
System.out.println(" %%%%%%%%%%%%%%%%%%%%%%% : "+name);
if(name == null || name.isEmpty())
throw new CustomException("Invalid name");
else
return "Hello !"+name;
}
}

CustomException.java

package per.sample.rest.exception;

public class CustomException  extends RuntimeException{

/**

* 

*/

private static final long serialVersionUID = 1L;

public CustomException() {

super();

}

public CustomException(String message, Throwable e) {

super(message, e);

}

public CustomException(String arg0) {

super(arg0);

}

public CustomException(Throwable arg0) {

super(arg0);

}

public int getErrorId() {

// TODO Auto-generated method stub

return 0;

}

}

CustomExceptionMapper.java

package per.sample.rest.exception;

import javax.ws.rs.core.MediaType;

import javax.ws.rs.core.Response;

import javax.ws.rs.ext.ExceptionMapper;

import javax.ws.rs.ext.Provider;

import per.sample.rest.bean.ErrorResponse;

/**

 * javax.ws.rs.ext.ExceptionMapper is Contract for a provider 

 * that maps Java exceptions to Response. 

 * An implementation of this interface must be annotated with Provider. 

 *

 */

@Provider

public class CustomExceptionMapper implements ExceptionMapper<CustomException> {

public Response toResponse(

CustomException exception) {

        ErrorResponse errorResponse = new ErrorResponse();

        errorResponse.setErrorId(exception.getErrorId());

        errorResponse.setErrorCode(exception.getMessage());

        return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(

                errorResponse).type(

                MediaType.APPLICATION_XML).build();

 

    }

}