MySQL Connector/J 5.1: NPE when executing SQL with QueryTimeout>0 on fabric connection

[Chengdong He]

When executing sql with QueryTimeout settings, getProperties() in class FabricMySQLConnectionProxy gets NULL when constructing CancelTask resulting in NPE.
And sql with QueryTimeout settings is a common connection availability detection method in connection pool (e.g. tomcat built-in connection pool, druid connection pool). So this may cause the connection availability detection to fail, resulting in unpredictable behavior such as connection pools abandoning available connections.