java.lang.Exception:

    ### Error updating database.  Cause: java.sql.SQLException: Lock wait timeout exceeded; try restarting transaction

    解決辦法：

        執行MySQL命令: show full PRocesslist;

     然后找出查詢語句的系統id：kill掉被鎖住的線程id

    查看事物表: select * from information_schema.innodb_trx;

  參考文章：記一次處理MySql鎖等待（Lock wait timeout exceeded）：http://my.oschina.net/quanzhong/blog/222091