From 4c690fb5a3f52bdd1f8c894e61fe9ea8b21d1136 Mon Sep 17 00:00:00 2001
From: Sweet <sweet.yangyz@qq.com>
Date: Sat, 11 May 2019 17:17:54 +0800
Subject: [PATCH] Null point Exception during loading the checksum (#1788)

If you connect to the mysql with version 5.1, the result of command 'select @master_binlog_checksum' is an array with only one Null element .
---
 .../otter/canal/parse/inbound/mysql/MysqlConnection.java        | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/parse/src/main/java/com/alibaba/otter/canal/parse/inbound/mysql/MysqlConnection.java b/parse/src/main/java/com/alibaba/otter/canal/parse/inbound/mysql/MysqlConnection.java
index ee3408e9..90950692 100644
--- a/parse/src/main/java/com/alibaba/otter/canal/parse/inbound/mysql/MysqlConnection.java
+++ b/parse/src/main/java/com/alibaba/otter/canal/parse/inbound/mysql/MysqlConnection.java
@@ -521,7 +521,7 @@ public class MysqlConnection implements ErosaConnection {
         try {
             rs = query("select @@global.binlog_checksum");
             List<String> columnValues = rs.getFieldValues();
-            if (columnValues != null && columnValues.size() >= 1 && columnValues.get(0).toUpperCase().equals("CRC32")) {
+            if (columnValues != null && columnValues.size() >= 1 && columnValues.get(0) != null && columnValues.get(0).toUpperCase().equals("CRC32")) {
                 binlogChecksum = LogEvent.BINLOG_CHECKSUM_ALG_CRC32;
             } else {
                 binlogChecksum = LogEvent.BINLOG_CHECKSUM_ALG_OFF;