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我正在嘗試使用Spring管理的流程引擎使用Activiti 5.5工作，並且遇到了一些麻煩。如何在SpringBean中獲得當前的Activiti ProcessInstance？
我在我的工作流中有一個ServiceTask，它解析爲一個Spring Managed bean。它看起來像這樣：
<serviceTask id="springTask1" name="BeanTest" activiti:delegateExpression="${taskBean}"></serviceTask>
我不是開始通過代碼的過程，這個過程無論是通過activti-REST API或形式啓動。我如何從bean內部獲取執行此任務的上下文，以便我可以添加可在稍後的任務（如電子郵件）中引用的流程變量。我試着看看Activiti 5.5自帶的spring例子，但我沒有看到我的例子與例子有什麼不同。我正在實現JavaDelegate接口，與Spring示例顯示的一樣。
這裏是我的代碼：
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.");
}
}
}
}
這裏是Spring配置（鏜部分留出了簡潔）：
<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>
當我運行worflow，我得到一個錯誤：
06090000 Wrapped Exception (with status template): Delegate expression ${taskBean} did not resolve to an implementation of interface org.activiti.engine.impl.pvm.delegate.ActivityBehavior nor interface org.activiti.engine.delegate.JavaDelegate
全部回覆讚賞！ 在此先感謝。