adding FetchbillByBillId

src/main/java/com/billpaymentservice/bbps/exception/GlobalExceptionHandler.java

@@ -1,10 +1,16 @@
 package com.billpaymentservice.bbps.exception;
 
-import org.springframework.web.bind.annotation.RestControllerAdvice;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import com.billpaymentservice.bbps.dto.GeneralResp;
 
-@RestControllerAdvice 
+@ControllerAdvice
 public class GlobalExceptionHandler {
 
-
-
+    @ExceptionHandler(CustomException.class)
+    public ResponseEntity<GeneralResp> handleCustomException(CustomException ex) {
+        return new ResponseEntity<>(ex.getGeneralResp(), HttpStatus.INTERNAL_SERVER_ERROR);
+    }
 }