cryptoe commented on code in PR #16821:
URL: https://github.com/apache/druid/pull/16821#discussion_r1762825311


##########
server/src/main/java/org/apache/druid/server/initialization/jetty/CustomExceptionMapper.java:
##########
@@ -30,13 +31,20 @@
 @Provider
 public class CustomExceptionMapper implements 
ExceptionMapper<JsonMappingException>
 {
+  private static final Logger log = new Logger(CustomExceptionMapper.class);
+  public static final String ERROR_KEY = "error";
+  public static final String UNABLE_TO_PROCESS_ERROR = "unknown json mapping 
exception";
+
   @Override
   public Response toResponse(JsonMappingException exception)
   {
+    log.warn(exception.getMessage() == null ? UNABLE_TO_PROCESS_ERROR : 
exception.getMessage());
     return Response.status(Response.Status.BAD_REQUEST)
                    .entity(ImmutableMap.of(
-                       "error",
-                       exception.getMessage() == null ? "unknown json mapping 
exception" : exception.getMessage()
+                       ERROR_KEY,
+                       exception.getMessage() == null
+                       ? UNABLE_TO_PROCESS_ERROR
+                       : 
exception.getMessage().split(System.lineSeparator())[0]

Review Comment:
   Does a new error strategy work for you : 
https://github.com/apache/druid/pull/11711 as contributed here ?



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