activiti的坑

maven配置：

<dependency>
<groupId>org.activiti</groupId>
<artifactId>activiti-engine</artifactId>
<version>7-201802-EA</version>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.4.196</version>
<scope>test</scope>
</dependency>

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.11</version>
</dependency>

代码：

public class ActivitiTest {

public static void main(String[] args) {
ProcessEngineConfiguration processEngineConfiguration =
ProcessEngineConfiguration.createStandaloneProcessEngineConfiguration();
processEngineConfiguration.setJdbcUrl("jdbc:mysql://127.0.0.1:3306/test4?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&useSSL=true");
processEngineConfiguration.setJdbcDriver("com.mysql.cj.jdbc.Driver");
processEngineConfiguration.setJdbcUsername("root");
processEngineConfiguration.setJdbcPassword("");
processEngineConfiguration.setDatabaseSchema("ACT");
processEngineConfiguration.setDatabaseSchemaUpdate("drop-create");
processEngineConfiguration.setDatabaseSchemaUpdate(ProcessEngineConfiguration.DB_SCHEMA_UPDATE_TRUE);
ProcessEngine processEngine = processEngineConfiguration.buildProcessEngine();
// RepositoryService repositoryService = processEngine.getRepositoryService();
// RuntimeService runtimeService = processEngine.getRuntimeService();

}
}

运行发生错误：

Exception in thread "main" org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: java.sql.SQLSyntaxErrorException: Table 'test4.act_ge_property' doesn't exist
### The error may exist in org/activiti/db/mapping/entity/Property.xml
### The error may involve org.activiti.engine.impl.persistence.entity.PropertyEntityImpl.selectProperty-Inline
### The error occurred while setting parameters
### SQL: select * from ACT_GE_PROPERTY where NAME_ = ?
### Cause: java.sql.SQLSyntaxErrorException: Table 'test4.act_ge_property' doesn't exist
at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:150)

Caused by: java.sql.SQLSyntaxErrorException: Table 'test4.act_ge_property' doesn't exist
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:118)

解决方法：

(1)把mysql8.0的版本改成5.0的

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.41</version>
</dependency>

(2)修改驱动：

com.mysql.jdbc.Driver

//activiti的服务

Service接口	作用
RepositoryService	流程仓库Service，用于管理流程仓库，例如部署、删除、读取流程资源
IdentifyService	身份Service，用于管理和查询用户、组之间的关系
RuntimeService	运行时Service，可以也拿过来处理所有正在运行状态的流程实例、任务等
TaskService	任务Service，用于管理和查询任务，例如签收、办理、指派等
FormService	表单Service，用于读取流程、任务相关的表单数据
HistoryService	历史Service，用于查询所有历史数据，例如流程实例、任务、活动、变量、附件
ManagementService	引擎管理Service，和具体业务无关，主要可以查询引擎配置、数据库、作业等