cmonkey commented on a change in pull request #6584:
URL: https://github.com/apache/shardingsphere/pull/6584#discussion_r464833792



##########
File path: 
shardingsphere-proxy/shardingsphere-proxy-frontend/shardingsphere-proxy-frontend-mysql/src/main/java/org/apache/shardingsphere/proxy/frontend/mysql/MySQLErrPacketFactory.java
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@@ -47,7 +47,7 @@ public static MySQLErrPacket newInstance(final int 
sequenceId, final Exception c
         if (cause instanceof SQLException) {
             SQLException sqlException = (SQLException) cause;
             return null != sqlException.getSQLState() ? new 
MySQLErrPacket(sequenceId, sqlException.getErrorCode(), 
sqlException.getSQLState(), sqlException.getMessage())
-                : new MySQLErrPacket(sequenceId, 
MySQLServerErrorCode.ER_INTERNAL_ERROR, sqlException.getCause().getMessage());
+                : new MySQLErrPacket(sequenceId, 
MySQLServerErrorCode.ER_INTERNAL_ERROR, cause.getMessage());

Review comment:
       val exception = new SQLException()
   MySQLErrPacketFactory.newInstance(1, exception)
   cause.isInstanceOf[SQLException) is true 
   
   cause.asInstanceOF[SQLException) to  sqlException
   sqlException.SQLState is null 
   sqlException.cuase is not null 
   sqlException.getCuase is null




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