【MySQL】activiti 创建23张表报错，Specified key was too long; max key length is 1000 bytes

activiti 创建23张表报错，Specified key was too long; max key length is 1000 bytes

错误代码： Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Specified key was too long; max key length is 1000 bytes

原因： activiti在MySQL中对表建立索引时，key的长度超过1000 bytes了，由于MySQL默认使用MyISAM engine，而MyLSAM引擎会有key长度的限制， 超过1000bytes就会报错，所以要将Mysql引擎修改为Innodb。

查看mysql情况： SHOW ENGINES

结果：

结果：
Engine              Support  Comment                                                         Transactions  XA      Savepoints  
------------------  -------  --------------------------------------------------------------  ------------  ------  ------------
PERFORMANCE_SCHEMA  YES      Performance Schema                                              NO            NO      NO          
MyISAM              DEFAULT  MyISAM storage engine                                           NO            NO      NO          
MRG_MYISAM          YES      Collection of identical MyISAM tables                           NO            NO      NO          
MEMORY              YES      Hash based, stored in memory, useful for temporary tables       NO            NO      NO          
InnoDB              NO       Supports transactions, row-level locking, and foreign keys      (NULL)        (NULL)  (NULL)      
FEDERATED           NO       Federated MySQL storage engine                                  (NULL)        (NULL)  (NULL)      
CSV                 YES      CSV storage engine                                              NO            NO      NO          
BLACKHOLE           YES      /dev/null storage engine (anything you write to it disappears)  NO            NO      NO          
ARCHIVE             YES      Archive storage engine                                          NO            NO      NO   

在mysql中查询

show VARIABLES like 'have_innodb'

DISABLED：INNODB引擎已存在但未启用。

YES： 已启用INNODB。

NO ：未安装INNODB。

接下来处理Mysql数据库不支持InnoDB问题及解决办法：

打开mysql配置文件，找到 skip-innodb项，将其改成#skip-innodb，之后重启mysql服务即可

备注：mysql的配置文件是/etc目录下的my.cnf文件 ,windows 下面是my.ini