org.activiti.engine.ActivitiException: couldn't check if tables are already present using metadata:

异常错误：org.activiti.engine.ActivitiException: couldn't check if tables are already present using metadata: 

导入的mysql包版本太新，所对应的mysql数据库跟不上版本 

修改成底版本的 mysql-connector-java-5.1.10.jar

mysql 连接驱动也改回成 com.mysql.jdbc.Driver

        //连接数据库的配置  
        processEngineConfiguration.setJdbcDriver("com.mysql.jdbc.Driver");  
        processEngineConfiguration.setJdbcUrl("jdbc:mysql:///activiti?characterEncoding=UTF-8&useUnicode=true");  
        processEngineConfiguration.setJdbcUsername("root"); 
        processEngineConfiguration.setJdbcPassword("root");