spring+mybatis 事务不启作用?报错

配置文件入下：

service层：

public int saveRole(Map<String, Object> paramMap) {
  int count = 0;
  String roleName=paramMap.get("roleName")==null?"":paramMap.get("roleName").toString();
  String state=paramMap.get("state")==null?"":paramMap.get("state").toString();
  String roleIdStr=paramMap.get("roleId")==null?"":paramMap.get("roleId").toString();
  Long roleId = 0l ;
  if(!"".equals(roleIdStr.trim())){
   roleId = Long.valueOf(roleIdStr);
  }  
  Role role = new Role();  
  if(roleId==0){
   role.setRoleName(roleName);
   role.setState(Long.valueOf(state));   
   role.setFcd(new Date());
   role.setLcd(new Date());
   count = roleMapper.insert(role);
  }else {
   role.setRoleId(roleId);
   role.setRoleName(roleName);
   role.setState(Long.valueOf(state));
   
   role.setLcd(new Date());
   count = roleMapper.updateByPrimaryKey(role);
  }
  int j=1/0;
  System.out.println("ssssssssss");
  return count;
 }

int j=1/0 报错了，但是数据照样插入数据库，没有回滚。

麻烦给看看，谢谢