[GitHub] [shardingsphere] RaigorJiang commented on a change in pull request #13463: Improve error message for SQLException.

[GitBox <gi...@apache.org>]

RaigorJiang commented on a change in pull request #13463:
URL: https://github.com/apache/shardingsphere/pull/13463#discussion_r742679804



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File path: shardingsphere-proxy/shardingsphere-proxy-frontend/shardingsphere-proxy-frontend-mysql/src/main/java/org/apache/shardingsphere/proxy/frontend/mysql/err/MySQLErrPacketFactory.java
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@@ -125,4 +126,11 @@ public static MySQLErrPacket newInstance(final Exception cause) {
         }
         return new MySQLErrPacket(1, CommonErrorCode.UNKNOWN_EXCEPTION, cause.getMessage());
     }
+    
+    private static String getErrorMessage(final SQLException cause) {
+        if (null != cause.getNextException() && StringUtils.isBlank(cause.getMessage())) {
+            return cause.getNextException().getMessage();

Review comment:
       This does not need to be the tail of the link, just get a meaningful exception for user. 
   According to all the code of `setNextException`, it makes sense to start from the first next.




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