如何在Activiti JavaDelegate中访问spring bean？ [英] How can I access a spring bean in Activiti JavaDelegate?
问题描述
我正在尝试获取一个简单的Spring示例以与Activiti 5.5一起使用，但遇到了一些麻烦。我正在使用配置有activiti的流程引擎在％activiti_home％/ apps / apache-tomcat-6.0.32 / webapps / activiti-rest下。
I'm trying to get a simple Spring example to work with Activiti 5.5, and having some trouble. I'm using the process engine configured with activiti under %activiti_home%/apps/apache-tomcat-6.0.32/webapps/activiti-rest.
我修改了弹簧配置文件，以使其包含我的自定义spring配置文件：
I modified the spring config file so that it performs an include of my custom spring configuration file:
<import resource="classpath*:applicationContext*.xml"/>
我将applicationContext.xml文件部署到activiti-rest / WEB-INF / classes文件夹中。
Activiti启动正常，我在bean构造函数中看到System.out.println，因此我知道正在读取spring配置并正在构造bean。我为实现JavaDelegate的类创建了一个Spring bean，并将我的bean注入到它中，并且总是出现null。
I deployed my applicationContext.xml file to the activiti-rest/WEB-INF/classes folder. Activiti starts up fine, and I see the System.out.println in my bean constructor, so I know that my spring config is being read and the bean is being constructed. I created a spring bean for the class that implements JavaDelegate and injected my bean to it and it always comes up null.
这是我的Spring Config：
Here is my Spring Config:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
<bean id="myBean" class="org.bpmn.examples.MyBean"/>
<bean id="taskBean" class="org.bpmn.examples.GetBeanTest">
<property name="myBean" ref="myBean"/>
</bean>
</beans>
这是我的豆子：
package org.bpmn.examples;
import java.io.Serializable;
public class MyBean implements Serializable {
public MyBean() {
super();
System.out.println("<========================== myBean ===========================>");
System.out.println("<========================== myBean ===========================>");
System.out.println("<========================== myBean ===========================>");
}
/**
*
*/
private static final long serialVersionUID = -2867207654072787909L;
Long id;
String description;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
}
这是我的课程JavaDelegate：
Here is my class that implements the JavaDelegate:
package org.bpmn.examples;
import org.activiti.engine.delegate.DelegateExecution;
import org.activiti.engine.delegate.JavaDelegate;
public class GetBeanTest implements JavaDelegate {
private MyBean myBean;
@Override
public void execute(DelegateExecution execution) throws Exception {
if(myBean == null){
System.out.println("Bean was null!");
}else{
System.out.println("Bean is valid!");
}
}
public void setMyBean(MyBean myBean) {
this.myBean = myBean;
}
}
这一切对我来说似乎很简单，但是我认为问题是Activiti不在我的JavaService任务上调用的类中使用spring bean，而是在创建新实例。
This all seems pretty straightforward to me, however I think the problem is that Activiti is not using a spring bean in the class that is being invoked on my JavaService task, it is creating a new instance.
<?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: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://www.activiti.org/test">
<process id="TestSpringConfig" name="TestSpringConfig">
<documentation>Place documentation for the 'TestSpringConfig' process here.</documentation>
<startEvent id="startevent1" name="Start"></startEvent>
<serviceTask id="servicetask1" name="BeanTest" activiti:class="org.bpmn.examples.GetBeanTest"></serviceTask>
<endEvent id="endevent1" name="End"></endEvent>
<sequenceFlow id="flow1" name="" sourceRef="startevent1" targetRef="servicetask1"></sequenceFlow>
<sequenceFlow id="flow2" name="" sourceRef="servicetask1" targetRef="endevent1"></sequenceFlow>
</process>
</definitions>
如何获得对Spring Bean的引用？已被配置为JPA实体？
How do I get a reference to a Spring Bean either a simple one such as I have here, or one that has been configured as a JPA Entity?
任何/所有答复都受到赞赏！
Any/All replies appreciated!
6.28.2011
更新：
在尝试将activiti-rest应用更改为使用SpringProcessEngineConfiguration而不是独立的StandaloneProcessEngineConfiguration时，我在其中更改了activiti-cfg.xml文件。 activiti-cfg.jar文件并重新启动了Tomcat。
6.28.2011 Updated: In trying to change the activiti-rest app to use the SpringProcessEngineConfiguration instead of the standalone StandaloneProcessEngineConfiguration, I changed the activiti-cfg.xml file in the activiti-cfg.jar file and restarted Tomcat.
我将xml文件更改为：
I change the xml file to look like this:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="dataSource" class="org.springframework.jdbc.datasource.SimpleDriverDataSource">
<property name="driverClass" value="org.h2.Driver" />
<property name="url" value="jdbc:h2:tcp://localhost/activiti" />
<property name="username" value="sa" />
<property name="password" value="" />
</bean>
<bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration"/>
<bean id="processEngine" class="org.activiti.spring.ProcessEngineFactoryBean">
<property name="processEngineConfiguration" ref="processEngineConfiguration" />
</bean>
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">
<property name="dataSource" ref="dataSource" />
<property name="transactionManager" ref="transactionManager" />
<property name="databaseSchemaUpdate" value="true" />
<property name="jobExecutorActivate" value="false" />
</bean>
<bean id="processEngine" class="org.activiti.spring.ProcessEngineFactoryBean">
<property name="processEngineConfiguration" ref="processEngineConfiguration" />
</bean>
<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" />
</beans>
当我重新启动Tomcat时，没有出现异常，但是当我启动Explorer并尝试登录时，我得到了以下异常：
When I restarted Tomcat no exceptions appear, however when I bring up Explorer and try to login, I get the following Exception:
INFO: Server startup in 12011 ms
10:32:02,338 ERROR [extensions.webscripts.AbstractRuntime] Exception from executeScript - redirecting to status template error: 05280000 Wrapped Exception (with status template): null
org.springframework.extensions.webscripts.WebScriptException: 05280000 Wrapped Exception (with status template): null
at org.springframework.extensions.webscripts.AbstractWebScript.createStatusException(AbstractWebScript.java:742)
at org.springframework.extensions.webscripts.DeclarativeWebScript.execute(DeclarativeWebScript.java:167)
推荐答案
我的一个项目在春季使用Activiti。我认为JavaDelagate可能是问题所在。您可以按以下方式从activiti的服务任务中调用每个Spring bean：
One of my project uses Activiti with spring. I think that JavaDelagate can be the problem. You can call from activiti's service task every spring bean this way:
bean定义：
<bean id="exampleBean" class="org.bpmn.examples.ExampleBean"/>
activiti xml：
activiti xml:
<serviceTask id="servicetask" name="Example" activiti:expression="${exampleBean.doSomething()}"></serviceTask>
您还可以将参数传递给函数，例如过程变量：
You can also pass parameters to the functions for example process variables:
<serviceTask id="servicetask" name="Example" activiti:expression="${exampleBean.doSomething(processVariable)}"></serviceTask>
我总是以这种方式使用服务任务，并且对单例bean没问题。
希望能有所帮助。如果我不明白您的问题，请发表评论。
I always use service tasks this way, and haven't got problem with singleton beans. Hope it helps. Please take a comment, if I didn't understand your problem.
更新：
我的项目使用activiti就像嵌入式工作流引擎一样。 Activiti与我的Web应用程序使用相同的applicationContext。
My project uses activiti like an embedded workflow engine. Activiti uses the same applicationContext with my webapp.
我的流程引擎配置：
<bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">
<property name="databaseType" value="mssql" />
<property name="dataSource" ref="dataSource" />
<property name="transactionManager" ref="transactionManager" />
<property name="databaseSchemaUpdate" value="true" />
<property name="jobExecutorActivate" value="true" />
<property name="deploymentResources" value="classpath*:/diagrams/*.bpmn20.xml" />
</bean>
<bean id="processEngine" class="org.activiti.spring.ProcessEngineFactoryBean">
<property name="processEngineConfiguration" ref="processEngineConfiguration" />
</bean>
这篇关于如何在Activiti JavaDelegate中访问spring bean？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
