如何在SpringBean中获取当前的Activiti ProcessInstance？

Question

我正在尝试通过Spring托管流程引擎使用Activiti 5.5来使工作流正常工作，但遇到了一些麻烦。

我的工作流程中有一个ServiceTask，可以解析为Spring Managed Bean。看起来像这样：

<serviceTask id="springTask1" name="BeanTest" activiti:delegateExpression="${taskBean}"></serviceTask>

我不是通过代码启动过程，而是通过activti-rest api或表单启动过程。我如何从Bean内部获取执行此任务的上下文，以便我可以添加可以在以后的任务（例如电子邮件）中引用的过程变量。我尝试查看Activiti 5.5附带的春季示例，但看不到我的示例与示例有何不同。我正在实现JavaDelegate接口，与春季示例所示的一样。

这是我的代码：

public class GetBeanTest implements JavaDelegate {

private ContactService contactService;

public GetBeanTest() {
    super();
}

public String getContactName(String contactName) throws Exception {
    String retVal= "unknown";
    if(contactService == null){
        System.out.println("Bean was null!");
    }else{
        System.out.println("Bean is valid!");
        List<Contact> contacts= contactService.getContacts();
        System.out.println("There are " + contacts.size() +" in the contact list.");
        for (Contact contact : contacts) {
            if(contact.getName().equalsIgnoreCase(contactName)){
                System.out.println("Found the contact! " + contactName );
                retVal= contact.getEmail();
            }
        }
    }
    return retVal;

}

public void setContactService(ContactService contactService) {
    this.contactService = contactService;
}

@Override
public void execute(DelegateExecution execution) throws Exception {
    System.out.println("+++++++++++++ in execute ++++++++++++++++");
    System.out.println("Event Name: " + execution.getEventName());
    System.out.println("ID: " + execution.getId());
    System.out.println("Process Instance ID: " + execution.getProcessInstanceId());
    Set<String> varNames= execution.getVariableNames();
    for (String string : varNames) {
        System.out.println("Varible Named " + string + " exists");
        if(string.equalsIgnoreCase("contactName")){
            String contactName= (String) execution.getVariable(string);
            getContactName(contactName);
        }else{
            System.out.println("unable to find contact name.");
        }
    }
}

}

这里是弹簧配置（为简洁起见，省略了无聊的部分：]

<bean id="processEngine" class="org.activiti.spring.ProcessEngineFactoryBean">
    <property name="processEngineConfiguration" ref="processEngineConfiguration" />
  </bean>

<!--Dao Beans -->
<bean id="contactDao" class="org.psc.database.dao.jpa.ContactDaoImpl"/>

<!--  Service Beans -->

  <bean id="repositoryService" factory-bean="processEngine" factory-method="getRepositoryService" />
  <bean id="runtimeService" factory-bean="processEngine" factory-method="getRuntimeService" />
  <bean id="taskService" factory-bean="processEngine" factory-method="getTaskService" />
  <bean id="historyService" factory-bean="processEngine" factory-method="getHistoryService" />
  <bean id="managementService" factory-bean="processEngine" factory-method="getManagementService" />
  <bean id="identityService" factory-bean="processEngine" factory-method="getIdentityService" />

<bean id="contactService" class="org.psc.service.impl.ContactServiceImpl">
    <property name="contactDao" ref="contactDao"/>
</bean>

<bean id="contact" class="org.psc.bpmn.tasks.Contact"/>
<bean id="taskBean" class="org.psc.bpmn.examples.GetBeanTest">
        <property name="contactService" ref="contactService"/>
</bean>

运行worflow时出现错误：

06090000包装的异常（带有状态模板）：委托表达式$ {taskBean}不能解析为接口org.activiti.engine.impl.pvm.delegate.ActivityBehavior或接口org.activiti.engine.delegate.JavaDelegate的实现] >

任何/所有答复表示赞赏！预先感谢。

我正在尝试通过Spring托管流程引擎使用Activiti 5.5来使工作流正常工作，但遇到了一些麻烦。我的工作流程中有一个ServiceTask，可以解析为Spring Managed Bean...。

Answer 1

您也可以通过这种方式在服务任务中使用spring bean：

Answer 2

1. 获取ProcessEngine