activiti 5.16 businessKey 为null 处理。

activiti版本 5.16

产生原因：创建子流程时，businesskey 不传递。

解决如下：

1、创建监听类：

1import org.activiti.engine.delegate.event.ActivitiEntityEvent;
2import org.activiti.engine.delegate.event.ActivitiEvent;
3import org.activiti.engine.delegate.event.ActivitiEventListener;
4import org.activiti.engine.impl.persistence.entity.ExecutionEntity;
5import org.activiti.engine.impl.persistence.entity.TaskEntity;
6import org.apache.commons.lang3.StringUtils;
7import org.slf4j.Logger;
8import org.slf4j.LoggerFactory;
9
10public class BusinessKeyInjectionActivitiEventListener implements ActivitiEventListener {
11    private Logger log = LoggerFactory.getLogger(getClass());
12    @Override
13    public void onEvent(ActivitiEvent event) {
14        switch (event.getType()) {
15            case TASK_CREATED:
16                if (event instanceof ActivitiEntityEvent) {
17                    ActivitiEntityEvent activityEntityEvent = (ActivitiEntityEvent) event;
18
19                    TaskEntity taskEntity = (TaskEntity) activityEntityEvent.getEntity();
20                    ExecutionEntity exEntity = taskEntity.getExecution();
21                    String key = exEntity.getBusinessKey();
22                    log.info("获取当前任务的流程实例的businessKey:{}",key);
23                    if(StringUtils.isEmpty(key)){
24                        ExecutionEntity superExecEntity = exEntity.getSuperExecution();
25                        key=superExecEntity.getBusinessKey();
26                        if(StringUtils.isEmpty(key)){
27                            key=superExecEntity.getProcessInstance().getBusinessKey();
28                        }
29                        log.info("获取当前任务 上一个流程实例的businessKey:{}",key);
30                        log.info("设置当前流程实例的businessKey:{}",key);
31                        exEntity.setBusinessKey(key);
32                        //让businessKey生效 此处非常关键。
33                        exEntity.updateProcessBusinessKey(key);
34                    }
35                    break;
36                }
37            default:
38                break;
39        }
40    }
41
42    @Override
43    public boolean isFailOnException() {
44        // TODO Auto-generated method stub
45        return false;
46    }
47}

2、配置监听：

1<bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">
2		<property name="dataSource"          ref="dataSourceTech" />
3		<property name="jobExecutorActivate" value="true" />
4	<!-- 其间的配置见官方demo -->
5
6		<property name="eventListeners">
7			<list>
8<!--				businessKey空值处理监听 -->
9				<bean class="com.cdel.activiti.listener.BusinessKeyInjectionActivitiEventListener"/>
10			</list>
11		</property>
12		
13	</bean>