SpringBoot+Activiti的serviceTask注入异常问题

       在使用springboot+activiti的serviceTask过程中，通过activiti:delegateExpression的代理方式注入bean，如${serviceTaskService}的时候，在实现@Service注解而没有指定注解值的时候将会出现以下异常

org.activiti.engine.ActivitiException: Unknown property used in expression: ${serviceTaskService}
	at org.activiti.engine.impl.bpmn.behavior.ServiceTaskDelegateExpressionActivityBehavior.execute(ServiceTaskDelegateExpressionActivityBehavior.java:119) ~[activiti-engine-6.0.0.jar:6.0.0]
	at org.activiti.engine.impl.agenda.ContinueProcessOperation.executeActivityBehavior(ContinueProcessOperation.java:180) ~[activiti-engine-6.0.0.jar:6.0.0]
	at org.activiti.engine.impl.agenda.ContinueProcessOperation.executeSynchronous(ContinueProcessOperation.java:131) ~[activiti-engine-6.0.0.jar:6.0.0]
	at org.activiti.engine.impl.agenda.ContinueProcessOperation.continueThroughFlowNode(ContinueProcessOperation.java:89) ~[activiti-engine-6.0.0.jar:6.0.0]
	at org.activiti.engine.impl.agenda.ContinueProcessOperation.run(ContinueProcessOperation.java:55) ~[activiti-engine-6.0.0.jar:6.0.0]
	at org.activiti.engine.impl.interceptor.CommandInvoker.executeOperation(CommandInvoker.java:73) ~[activiti-engine-6.0.0.jar:6.0.0]
	at org.activiti.engine.impl.interceptor.CommandInvoker.executeOperations(CommandInvoker.java:57) ~[activiti-engine-6.0.0.jar:6.0.0]
	at org.activiti.engine.impl.interceptor.CommandInvoker.execute(CommandInvoker.java:42) ~[activiti-engine-6.0.0.jar:6.0.0]
	at org.activiti.engine.impl.interceptor.TransactionContextInterceptor.execute(TransactionContextInterceptor.java:48) ~[activiti-engine-6.0.0.jar:6.0.0]
	at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:63) ~[activiti-engine-6.0.0.jar:6.0.0]
	at org.activiti.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:47) [activiti-spring-6.0.0.jar:6.0.0]
	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:133) [spring-tx-4.3.18.RELEASE.jar:4.3.18.RELEASE]
	at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:45) [activiti-spring-6.0.0.jar:6.0.0]
	at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:29) [activiti-engine-6.0.0.jar:6.0.0]
	at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:44) [activiti-engine-6.0.0.jar:6.0.0]
	at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:39) [activiti-engine-6.0.0.jar:6.0.0]
	at org.activiti.engine.impl.RuntimeServiceImpl.startProcessInstanceByKey(RuntimeServiceImpl.java:82) [activiti-engine-6.0.0.jar:6.0.0]
	at com.activiti.service.impl.OverTimerServiceImpl.startWorkFlow(OverTimerServiceImpl.java:29) [classes/:na]

          刚开始的时候一直没有找到问题的原因，通过慢慢摸索原来只需要把注解@Servcie修改为@Service(value="serviceTaskService")即给该注解添加值就可以了，这是一个相当郁闷的事情，因为spring通常会自动的按照接口类来默认给注解取值，但是在activiti的serviceTask通过代理的时候就出问题了，这可能跟activiti的代码实现由关，没有实现初始缓存的原因，所以调用的时候就出问题了。下面贴下代码

 

serviceTest.bpmn20.xml：

 

<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:activiti="http://activiti.org/bpmn" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:omgdi="http://www.omg.org/spec/DD/20100524/DI" typeLanguage="http://www.w3.org/2001/XMLSchema" expressionLanguage="http://www.w3.org/1999/XPath" targetNamespace="http://activiti.org/test">
  <process id="serviceTest" name="serviceTest" isExecutable="true">
    <endEvent id="end" name="end"/>
    <sequenceFlow sourceRef="start" targetRef="task1" id="start-task1"/>
    <sequenceFlow sourceRef="task1" targetRef="task2" id="task1-task2"/>
    <sequenceFlow sourceRef="task2" targetRef="end" id="task2-end"/>
    <serviceTask id="task1" name="任务1" activiti:delegateExpression="${serviceTaskService}"/>
    <serviceTask id="task2" name="任务2" activiti:delegateExpression="${serviceTaskService}"/>

    <startEvent id="start" name="start"/>
  </process>
  <bpmndi:BPMNDiagram>
    <bpmndi:BPMNPlane>
      <bpmndi:BPMNShape bpmnElement="start">
        <omgdc:Bounds height="48.0" width="51.0" x="-12.0" y="-4.0"/>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="task1">
        <omgdc:Bounds height="64.0" width="84.0" x="159.0" y="-10.0"/>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="end">
        <omgdc:Bounds height="51.0" width="56.0" x="450.0" y="3.0"/>
      </bpmndi:BPMNShape>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
  <bpmndi:BPMNDiagram>
    <bpmndi:BPMNPlane>
      <bpmndi:BPMNShape bpmnElement="task2">
        <omgdc:Bounds height="71.0" width="83.0" x="427.0" y="55.0"/>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="end">
        <omgdc:Bounds height="48.0" width="48.0" x="660.0" y="68.0"/>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="task1">
        <omgdc:Bounds height="48.0" width="120.0" x="210.0" y="65.0"/>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="start">
        <omgdc:Bounds height="48.0" width="48.0" x="39.0" y="61.0"/>
      </bpmndi:BPMNShape>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>

 

 

ServiceTaskService接口：

import org.activiti.engine.delegate.JavaDelegate;

/**
 * @version 1.0
 * @date 2018/7/12
 * @description
 */
public interface ServiceTaskService extends JavaDelegate {

}

 

ServiceTaskServiceImpl实现类:

import com.activiti.service.ServiceTaskService;
import org.activiti.engine.delegate.DelegateExecution;
import org.springframework.stereotype.Service;

/**
 * @version 1.0
 * @date 2018/7/12
 * @description
 */
@Service(value = "serviceTaskService")
public class ServiceTaskServiceImpl implements ServiceTaskService {

    @Override
    public void execute(DelegateExecution delegateExecution) {
        System.out.println("当前节点:" + delegateExecution.getCurrentFlowElement().getName());
    }
}

 controller启动类：

package com.activiti.service.impl;

import org.activiti.engine.RuntimeService;
import org.activiti.engine.runtime.ProcessInstance;
import org.springframework.transaction.annotation.Transactional;

import org.springframework.web.bind.annotation.RestController;

import org.springframework.web.bind.annotation.GetMapping;
import javax.annotation.Resource;
import java.util.Optional;

/**
 * @version 1.0
 * @date 2018/7/10
 * @description
 */
@RestController
public class ServiceTaskController {

    @Resource
    private RuntimeService runtimeService;

    @Transactional(rollbackFor = Exception.class)
   @GetMapping(value = "/startWorkflow")
    public boolean startWorkflow(@RequestParam(value = "workFlowName")String workFlowName) {
        // 通过流程定义的key启动，选取最高的version启动
        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey(workFlowName);
        if (Optional.ofNullable(processInstance).isPresent()
                && processInstance.getProcessInstanceId().length() > 0) {
            return true;
        }
        return false;
    }

}

 maven配置

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.test</groupId>
    <artifactId>test_springboot_activiti</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.14.RELEASE</version>
    </parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.activiti</groupId>
            <artifactId>activiti-spring-boot-starter-basic</artifactId>
            <version>6.0.0</version>
        </dependency>

        <!--<dependency>
            <groupId>org.activiti</groupId>
            <artifactId>activiti5-engine</artifactId>
            <version>6.0.0</version>
        </dependency>-->

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</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>
        </dependency>

        <!--HikariCP数据连接池 -->
        <dependency>
            <groupId>com.zaxxer</groupId>
            <artifactId>HikariCP</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.18</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

 更多例子可以参考https://github.com/422518490/test_springboot_activiti