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我正在尝试使用 Spring 托管流程引擎使用 Activiti 5.5 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 解析为 Spring Managed bean。它看起来像这样:

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

我不是通过代码启动该过程,该过程是通过 activti-rest api 或表单启动的。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)中引用的流程变量。我尝试查看 Activiti 5.5 附带的 spring 示例,但我看不出我的示例与示例有何不同。我正在实现与 spring 示例显示的相同的 JavaDelegate 接口。

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>

当我运行 worflow 时,我收到一个错误:

06090000 包装异常(带有状态模板):委托表达式 ${taskBean} 没有解析为接口 org.activiti.engine.impl.pvm.delegate.ActivityBehavior 或接口 org.activiti.engine.delegate.JavaDelegate 的实现

任何/所有回复表示赞赏!提前致谢。

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2 回答 2

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您也可以通过这种方式在服务任务中使用 spring bean:

  1. 您应该制作一个 spring 托管 bean(不需要实现 JavaDelegate)
  2. 在 ServiceTask 中使用这个配置:activiti:expression="${taskBean.someMethod()}"

我总是在spring环境中使用这个配置。希望能帮助到你!

列维

于 2011-09-13T08:28:20.033 回答
0
  1. 获取ProcessEngine
  2. 获取任务服务
  3. 创建查询以查找流程实例,taskService.createTaskQuery()
  4. 最后,task.getProcessInstanceId()
于 2020-06-11T22:48:19.313 回答