【发布时间】：2011-06-24 22:15:40
【问题描述】：
我试图让一个简单的 Spring 示例与 Activiti 5.5 一起使用，但遇到了一些麻烦。我正在使用在 %activiti_home%/apps/apache-tomcat-6.0.32/webapps/activiti-rest 下配置了 activiti 的流程引擎。
我修改了 spring 配置文件，使其包含我的自定义 spring 配置文件：
<import resource="classpath*:applicationContext*.xml"/>
我将 applicationContext.xml 文件部署到 activiti-rest/WEB-INF/classes 文件夹。 Activiti 启动正常，我在我的 bean 构造函数中看到 System.out.println，所以我知道我的 spring 配置正在被读取并且 bean 正在被构造。我为实现 JavaDelegate 的类创建了一个 spring bean，并将我的 bean 注入它，它总是出现 null。
这是我的 Spring 配置：
<?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 Bean：
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;
}
}
这是我实现 JavaDelegate 的类：
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，但是我认为问题在于 Activiti 没有在我的 JavaService 任务上调用的类中使用 spring bean，它正在创建一个新实例。
<?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，无论是简单的，例如我这里的，还是配置为 JPA 实体的？
感谢任何/所有回复！
6.28.2011 更新： 在尝试将 activiti-rest 应用程序更改为使用 SpringProcessEngineConfiguration 而不是独立的 StandaloneProcessEngineConfiguration 时，我更改了 activiti-cfg.jar 文件中的 activiti-cfg.xml 文件并重新启动了 Tomcat。
我将 xml 文件更改为如下所示：
<?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，但是当我打开资源管理器并尝试登录时，我得到以下异常：
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)
【问题讨论】：
标签： spring workflow javabeans activiti