First need to create a trait Groovy file as follows under src/groovy:
trait CustomExceptionHandler {
/* Handle common exception */
def handleException(Exception e) {
handleCustomException(new CustomException(e.getMessage()))
}
/* Handle defined custom exception */
def handleCustomException2(CustomException2 e) {
handleCustomException(e)
}
/* Handle defined custom exception */
def handleCustomException(CustomException e) {
if (!CommonUtils.request) {
// do something
}
else {
CommonUtils.currentResponse.status = 220 (Custom response code)
if(e.getStatusCode()) {
CommonUtils.currentResponse.status = e.getStatusCode()
}
if (CommonUtils.request.xhr) {
def error = [
type: "error",
message: e.getMessage()
]
render error as JSON
}
else {
render(view: "/error/error", model: [exception: e])
}
}
}
}
Create a groovy class under src/groovy:
import org.springframework.web.context.request.RequestContextHolder
class CommonUtils {
public static def getRequest() {
def request = RequestContextHolder.getRequestAttributes()
return request ? request.request : null
}
public static HttpServletResponse getCurrentResponse() {
return WebUtils.retrieveGrailsWebRequest().getCurrentResponse()
}
}
Exception Types (Reside in src/groovy):
class CustomException extends RuntimeException {
}
class CustomException2 extends CustomException {
}
How controller can use this feature:
class Controller1 implements CustomExceptionHandler {
def index() {
throw new Exception("Common exception")
}
def index2() {
throw new CustomException("Defined custom exception")
}
def index3() {
someService.index3()
}
def index4() {
someService.index4()
}
}
Exception thrown from service bahave same as from controller
class SomeService {
def index3() {
throw new Exception("Common exception")
}
def index4() {
throw new CustomException("Defined custom exception")
}
}
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