use spring in vaadin - spring

Question

i want to use spring in vaadin
it's my config:
web.xml
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<listener>
<listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
</listener>
<servlet>
<servlet-name>VaadinApplicationServlet</servlet-name>
<servlet-class>com.vaadin.server.VaadinServlet</servlet-class>
<init-param>
<param-name>UI</param-name>
<param-value>com.MyUI</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>VaadinApplicationServlet</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>
applicationContext.xml
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="org.postgresql.Driver"/>
<property name="url" value="jdbc:postgresql://localhost:5432/Activiti"/>
<property name="username" value="postgres"/>
<property name="password" value="10"/>
</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="databaseType" value="postgres"/>
<property name="dataSource" ref="dataSource"/>
<property name="transactionManager" ref="transactionManager"/>
<property name="databaseSchemaUpdate" value="true"/>
<property name="deploymentResources"
value="classpath* : #{Init.path_Process}"/>
<property name="history" value="audit"/>
<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"/>
<bean id="formService" factory-bean="processEngine"
factory-method="getFormService"/>
<bean id="identityService" factory-bean="processEngine"
factory-method="getIdentityService"/>
<bean id="Init" class="util.Init"/>
<context:annotation-config/>
<context:component-scan base-package="com"/>
<context:spring-configured/>
<bean class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor"/>
<bean class="org.springframework.context.annotation.CommonAnnotationBeanPostProcessor"/>
in MyUI class:
#java
#Component
#Configurable
public class MyUI extends UI {
protected void init(VaadinRequest vaadinRequest) {
...
#Autowired
private IdentityService identityService;
...
}}
this config work in junit and Ok!
but
when run in vaadin and tomcat , java.lang.NullPointerException error for identityService
where is my problem?
thanks

Answer 1

com.MyUI is created by the Vaadin servlet and that servlet does not know about Spring. What's happening is that your UI instance is created by reflection and isn't a Spring managed bean.
You need to use a Vaadin plugin that integrates with Spring. Please check the vaadin4spring project for more details.
Maybe you should update the class to org.vaadin.spring.servlet.SpringAwareVaadinServlet?

Answer 2

Try to autowire your bean explicite (e.g. in the constructor):
if (VaadinServlet.getCurrent() != null) {
try {
WebApplicationContextUtils
.getRequiredWebApplicationContext(VaadinServlet.getCurrent().getServletContext())
.getAutowireCapableBeanFactory().autowireBean(this);
} catch (BeansException e) {
LOG.error("Could not inject beans!" + this.getClass(), e); //$NON-NLS-1$
}
}

Answer 3

You may use ru.xpoft.vaadin.SpringVaadinServlet, check Vaadin website-addons
<servlet>
<servlet-name>MyCustom Application</servlet-name>
<servlet-class>ru.xpoft.vaadin.SpringVaadinServlet</servlet-class> ...............