SpringBoot 集成 Activiti 一路踩得坑

  由于项目需要,本人开始在项目Spring boot 中集成工作流引擎Activiti。由于第一次集成,一路上步步都是坑,怪我没有先去看官方文档。现将一路上遇到的问题一一记录。

 

一. 环境配置

  1.项目环境:Springboot2.0  +  Maven + activiti6.0 + Eclipse

  2.maven依赖:  

    <dependency>
      <groupId>org.activiti</groupId>
      <artifactId>activiti-spring-boot-starter-basic</artifactId>
      <version>6.0.0</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <!-- 单元测试 -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>

 

   3.安装eclipse插件:Activiti Designer插件;地址:http://www.activiti.org/designer/update/

二. 流程实例

  1.Spring boot项目启动类 

import org.activiti.spring.boot.SecurityAutoConfiguration;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication(exclude = SecurityAutoConfiguration.class)
@ComponentScan(value = {"com.river", "com.river.learn" })
public class App {
    
    public static void main( String[] args ){
        SpringApplication.run(App.class, args);
    }
}

  2.在 src/main/resources 下新建目录: processes/MyProcesses.bpmn 。

  

  注意:任务图标有好几种,如上就有两种,内涵是不同的。Properties是视图,可以在window -> show view中打开

  3.写service接口,用于bpmn文件调用

  

        

@Service

  public class TestService {

    public void activiti() {

      System.out.println("任务已经执行.....................................");
    }
    public List<String> user() {
      return Arrays.asList("xiaoming","xiaohong");

    }
  }

  4.写测试接口,进行测试  

package com.river.learn;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.activiti.engine.RuntimeService;
import org.activiti.engine.TaskService;
import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.engine.task.Task;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.river.learn.web.service.TestService;
import com.river.main.App;

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = App.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class ActivitiTest {

    @Autowired
    TestService testService;
    @Autowired
    RuntimeService runtimeService;
    @Autowired  
    private TaskService taskService;  

    
    @Test
    public void TestStartProcess() {
        System.out.println("Start.........");
        ProcessInstance pi = runtimeService.startProcessInstanceByKey("myProcess", "1");
        System.out.println("流程启动成功,流程id:"+pi.getId());
    }
    
    @Test
    public void findTasksByUserId() {
        String userId ="dulingjiang";
        List<Task> resultTask = taskService.createTaskQuery().processDefinitionKey("myProcess").taskCandidateOrAssigned(userId).list();
        System.out.println("任务列表:"+resultTask);
    }

}

  启动测试类,测试即可。

三. 问题

问题一:Caused by: java.lang.ArrayStoreException:sun.reflect.annotation.TypeNotPresentExceptionProxy

解决办法:项目一启动就报这个错误,折腾了很久都没有解决这个问题,最后在一篇博客上找到解决办法,但是遗憾的是忘记了作者的博客链接。解决办法是直接在启动类上加上  @SpringBootApplication(exclude = SecurityAutoConfiguration.class) 即可。SecurityAutoConfiguration.class来自于类 org.activiti.spring.boot.SecurityAutoConfiguration。第一次我引错了类,导致该问题无法解决。我还认为我的错误不是用这个方法解决。哎,小心仔细啊。

  

问题二:org.activiti.engine.ActivitiObjectNotFoundException: no processes deployed with key 'MyProcess'

解决办法:控制台提示 runtimeService.startProcessInstanceByKey("MyProcess", map) 中没有“MyProcess”,但是我在resource中的bpmn文件就是“MyProcess.bpmn”

改成小写:runtimeService.startProcessInstanceByKey("myProcess", map) 成功,runtimeService.startProcessInstanceByKey("MyProcess", map)中的"MyProcess"是指bpmn文件的id,有一个默认id为“myProcess”;

 

问题三:org.activiti.engine.ActivitiException: Could not execute service task expression

解决办法:在MyProcess.bpmn文件中配置的任务表达式错误,导致无法解析:在表达式中首字母应该小写,否则无法识别。

  

  

问题四:org.activiti.engine.ActivitiException: Expression did not resolve to a string or collection of strings

解决办法:我在第一次书写接口方法时,没有返回值,所以报错。审批节点设置的人返回的应该是数组,否则是错误的。

  

问题五:Caused by: java.lang.IllegalArgumentException: jdbcUrl is required with driverClassName。

问题描述:为activiti配置独立的数据源时,遇到了该问题。以下为配置:

application.properties文件

spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=123
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

ActivitiConfig.java文件

import java.io.IOException;

import javax.sql.DataSource;

import org.activiti.spring.SpringAsyncExecutor;
import org.activiti.spring.SpringProcessEngineConfiguration;
import org.activiti.spring.boot.AbstractProcessEngineAutoConfiguration;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.transaction.PlatformTransactionManager;

import com.river.datasource.DBIdentifier;
import com.river.datasource.DDSHolder;
import com.river.datasource.DynamicDataSource;

@Configuration//声名为配置类,继承Activiti抽象配置类
public class ActivitiConfig extends AbstractProcessEngineAutoConfiguration {
    
    @Bean
    @Primary
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource activitiDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean
    public SpringProcessEngineConfiguration springProcessEngineConfiguration(
            PlatformTransactionManager transactionManager,
            SpringAsyncExecutor springAsyncExecutor) throws IOException {

        return baseSpringProcessEngineConfiguration(
                activitiDataSource(),
                transactionManager,
                springAsyncExecutor);
    }
}

解决办法:修改application.properties文件中 spring.datasource.url 为  spring.datasource.jdbc-url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8 即可解决问题。暂时还不知道原理,猜测是与activiti的版本有关。

  待续......

 

posted @ 2018-08-10 14:42  井井凉风  阅读(78080)  评论(0编辑  收藏  举报