jinglining commented on a change in pull request #9859: [FLINK-11405][rest]rest 
api can more exceptions by query parameter
URL: https://github.com/apache/flink/pull/9859#discussion_r338368266
 
 

 ##########
 File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/rest/handler/job/JobExceptionsHandler.java
 ##########
 @@ -71,7 +72,11 @@ public JobExceptionsHandler(
        }
 
        @Override
-       protected JobExceptionsInfo 
handleRequest(HandlerRequest<EmptyRequestBody, JobMessageParameters> request, 
AccessExecutionGraph executionGraph) {
+       protected JobExceptionsInfo 
handleRequest(HandlerRequest<EmptyRequestBody, JobExceptionsMessageParameters> 
request, AccessExecutionGraph executionGraph) {
+               List<Integer> sizes = 
request.getQueryParameter(ExceptionShowSizeParameter.class);
+               if (sizes != null && sizes.size() == 1) {
 
 Review comment:
   As MessageQueryParameter's type is List<X>, sizes  has to define to 
List<Integer>. It's no good. Maybe we could split MessageQueryParameter to 
MessageQueryListParameter and MessageQueryObjectParameter?

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