Spring Boot+Activiti7入坑指南初阶版

Activiti 是一个轻量级工作流程和业务流程管理 (BPM) 平台，面向业务人员、开发人员和系统管理员。其核心是一个超快且坚如磐石的 Java BPMN 2 流程引擎。它是开源的，并根据 Apache 许可证分发。Activiti 可以在任何 Java 应用程序、服务器、集群或云中运行。它与 Spring 完美集成，非常轻量级并且基于简单的概念。

官网地址: Open Source Business Automation | Activiti

guithub地址: GitHub - Activiti/Activiti: Activiti is a light-weight workflow and Business Process Management (BPM) Platform targeted at business people, developers and system admins. Its core is a super-fast and rock-solid BPMN 2 process engine for Java. It's open-source and distributed under the Apache license. Activiti runs in any Java application, on a server, on a cluster or in the cloud. It integrates perfectly with Spring, it is extremely lightweight and based on simple concepts.Activiti is a light-weight workflow and Business Process Management (BPM) Platform targeted at business people, developers and system admins. Its core is a super-fast and rock-solid BPMN 2 process engine for Java. It's open-source and distributed under the Apache license. Activiti runs in any Java application, on a server, on a cluster or in the cloud. It integrates perfectly with Spring, it is extremely lightweight and based on simple concepts. - GitHub - Activiti/Activiti: Activiti is a light-weight workflow and Business Process Management (BPM) Platform targeted at business people, developers and system admins. Its core is a super-fast and rock-solid BPMN 2 process engine for Java. It's open-source and distributed under the Apache license. Activiti runs in any Java application, on a server, on a cluster or in the cloud. It integrates perfectly with Spring, it is extremely lightweight and based on simple concepts.https://github.com/Activiti/Activiti?tab=readme-ov-file

在idea插件中安装绘图插件

解决中文乱码

• 在IDEA中将File–>Settings–>Editor–>File Encodings修改为UTF-8
• 在IDEA的Help–>Edit Custom VM Options中末尾添加-Dfile.encoding=UTF-8
• 在IDEA的安装目录的bin目录下将idea.exe.vmoptions和idea64.exe.vmoptions两个文件末尾添加-Dfile.encoding=UTF-8
• 重启idea

使用IDE中的Spring Boot项目创建向导，创建一个新的Spring Boot项目。

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.1.10.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.example</groupId><artifactId>oa-activiti-workflow</artifactId><version>0.0.1-SNAPSHOT</version><name>oa-activiti-workflow</name><description>oa-activiti-workflow</description><url/><licenses><license/></licenses><developers><developer/></developers><scm><connection/><developerConnection/><tag/><url/></scm><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>8</java.version><maven.compiler.source>8</maven.compiler.source><maven.compiler.target>8</maven.compiler.target><activiti-dependencies.version>7.1.0.M3.1</activiti-dependencies.version></properties><dependencyManagement><dependencies><dependency><groupId>org.activiti.dependencies</groupId><artifactId>activiti-dependencies</artifactId><version>${activiti-dependencies.version}</version><scope>import</scope><type>pom</type></dependency></dependencies></dependencyManagement><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jdbc</artifactId></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope><exclusions><exclusion><artifactId>junit-jupiter</artifactId><groupId>org.junit.jupiter</groupId></exclusion></exclusions></dependency><!--activiti 7.x依赖 --><dependency><groupId>org.activiti</groupId><artifactId>activiti-spring-boot-starter</artifactId><!-- 由于activiti7是使用mybatis作为orm框架，我这里整合mybatis-plus，所以需要排除mybatis --><exclusions><exclusion><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId></exclusion></exclusions></dependency><dependency><groupId>org.junit.jupiter</groupId><artifactId>junit-jupiter</artifactId><version>5.8.2</version> <!-- 或最新版本 --><scope>test</scope></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus</artifactId><version>3.1.0</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

spring.application.name=oa-activiti-workflow
server.port=18080
# 数据库链接信息
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/activiti?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.username=root
spring.datasource.password=rootroot# 配置mybatis plus打印sql日志
mybatis-plus.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl# activiti配置
## 检测历史表是否存在 activiti7默认没有开启数据库历史记录 启动数据库历史记录
spring.activiti.db-history-used=true
# 记录历史等级 可配置的历史级别有none, activity, audit, full
## none：不保存任何的历史数据，因此，在流程执行过程中，这是最高效的。
## activity：级别高于none，保存流程实例与流程行为，其他数据不保存。
## audit：除activity级别会保存的数据外，还会保存全部的流程任务及其属性。audit为history的默认值。
## full：保存历史数据的最高级别，除了会保存audit级别的数据外，还会保存其他全部流程相关的细节数据，包括一些流程参数等
spring.activiti.history-level=full
## 1.false：默认值。activiti在启动时，对比数据库表中保存的版本，如果没有表或者版本不匹配，将抛出异常
## 2.true： activiti会对数据库中所有表进行更新操作。如果表不存在，则自动创建
## 3.create_drop： 在activiti启动时创建表，在关闭时删除表（必须手动关闭引擎，才能删除表）
## 4.drop-create： 在activiti启动时删除原来的旧表，然后在创建新表（不需要手动关闭引擎）
spring.activiti.database-schema-update=true
# 校验流程文件，默认校验resources下的processes文件夹里的流程文件
spring.activiti.check-process-definitions=false

package com.example.oaactivitiworkflow;import org.springframework.boot.SpringApplication;
import org.springframework.boot.actuate.autoconfigure.security.servlet.ManagementWebSecurityAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.JndiDataSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.jdbc.XADataSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration;@SpringBootApplication(exclude = {//activiti 默认整合security，屏蔽Security认证SecurityAutoConfiguration.class,ManagementWebSecurityAutoConfiguration.class,JndiDataSourceAutoConfiguration.class,XADataSourceAutoConfiguration.class
})
public class OaActivitiWorkflowApplication {public static void main(String[] args) {SpringApplication.run(OaActivitiWorkflowApplication.class, args);}}

spring.activiti.database-schema-update=true配置完启动测试后,发现发生了报错无法自动创建表。报错内容如下

Caused by: org.activiti.engine.ActivitiException: Could not update Activiti database schema: unknown version from database: '8.1.0'

该错误是由于  Activiti引擎版本与数据库架构版本不匹配 导致的。具体表现为：

1. 数据库中记录的Activiti架构版本（schema.version）为8.1.0，但当前项目使用的Activiti依赖版本无法识别该版本号。
2. 常见原因包括：

• 项目依赖的Activiti版本低于数据库中的架构版本。
• 数据库版本信息被手动修改或未正确初始化。
• 依赖冲突导致实际加载的Activiti版本与预期不符。

解决办法：

• 手动下载创建表的sql，地址:

Activiti/activiti-core/activiti-engine/src/main/resources/org/activiti/db/create at develop · Activiti/Activiti · GitHubActiviti is a light-weight workflow and Business Process Management (BPM) Platform targeted at business people, developers and system admins. Its core is a super-fast and rock-solid BPMN 2 process engine for Java. It's open-source and distributed under the Apache license. Activiti runs in any Java application, on a server, on a cluster or in the cloud. It integrates perfectly with Spring, it is extremely lightweight and based on simple concepts. - Activiti/activiti-core/activiti-engine/src/main/resources/org/activiti/db/create at develop · Activiti/Activitihttps://github.com/Activiti/Activiti/tree/develop/activiti-core/activiti-engine/src/main/resources/org/activiti/db/create

• 在数据库中执行创建: