我的问题很简单,当我从独立应用程序中运行 EventService 中的方法时(通过在main()中使用ClassPathXmlApplicationContext),一切正常。
@Service
@Transactional(readOnly = true)
public class EventService {
Logger log = Logger.getLogger(EventService.class);
@Autowired private EventDao eventDao;
public List<Event> getAll() {
return eventDao.getAll();
}
public List<Event> getAllContainsResource(int resourceId) {
return eventDao.getAllWithResource(resourceId);
}
public String getName() {
return "simpleName";
}
}
当我在tomcat(STS上的内置服务器)上运行时,容器正确启动但是当我向 getAll()方法或 getAllContainsResource(int)发送请求(通过AMF的Flex应用程序)时) * NullPointerException *出现。它显示 eventDao为空。我不知道是什么原因所以请帮忙。这是我的applicationContext:
<?xml version="1.0" encoding="UTF-8"?>
<beans>
<!-- database connection -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/rapla" />
<property name="username" value="root" />
<property name="password" value="admin" />
</bean>
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="hibernateProperties">
<value>
hibernate.dialect=org.hibernate.dialect.MySQLInnoDBDialect
hibernate.c3p0.min_size=5
hibernate.c3p0.max_size=20
hibernate.c3p0.timeout=1800
hibernate.c3p0.max_statements=50
hibernate.show_sql=true
hibernate.format_sql=true
hibernate.use_sql_comments=true
</value>
</property>
<property name="configLocation">
<value>classpath:hibernate.cfg.xml</value>
</property>
<property name="configurationClass">
<value>org.hibernate.cfg.AnnotationConfiguration</value>
</property>
</bean>
<bean id="txManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<tx:annotation-driven transaction-manager="txManager" />
<context:annotation-config />
<context:component-scan base-package="org.pwsz.dao.hibernate" />
<context:component-scan base-package="org.pwsz.services" />
<flex:message-broker />
</beans>
独立应用程序的XML是相同的,没有
<flex:message-broker />
EventDaoImpl:
@Repository
public class EventDaoImpl implements EventDao {
Logger log = Logger.getLogger(EventDaoImpl.class);
@Autowired private SessionFactory sessionFactory;
public Event getById(int id) {
return (Event) sessionFactory.getCurrentSession().get(Event.class, id);
}
public List<Event> getAll() {
return sessionFactory.getCurrentSession().createCriteria(Event.class).list();
}
public List<Event> getAllWithResource(Integer id) {
List<Event> resulu = sessionFactory.getCurrentSession()
.createCriteria(Event.class)
.createCriteria("appointments.teachers")
.add(Restrictions.eq("resourceId", id))
.list();
return resulu;
}
}
Spring-flex连接工作正常,我可以使用Flex Remote Object请求 getName ,但发送另外两个请求会产生null异常。
此致
我检查了WebApp中的问题(使用spring mvc),一切正常。我发现问题会产生Hibernate,当请求来自Flex(使用AMF协议)时,它会为DAO返回null sessionFactory(它们是@autowired)。
flex.messaging.MessageException: java.lang.NullPointerException : null
at flex.messaging.services.remoting.adapters.JavaAdapter.invoke(JavaAdapter.java:444)
at flex.messaging.services.RemotingService.serviceMessage(RemotingService.java:183)
at flex.messaging.MessageBroker.routeMessageToService(MessageBroker.java:1400)
at flex.messaging.endpoints.AbstractEndpoint.serviceMessage(AbstractEndpoint.java:1005)
at flex.messaging.endpoints.AbstractEndpoint$$FastClassByCGLIB$$1a3ef066.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:688)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.flex.core.MessageInterceptionAdvice.invoke(MessageInterceptionAdvice.java:66)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.adapter.ThrowsAdviceInterceptor.invoke(ThrowsAdviceInterceptor.java:124)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.Cglib2AopProxy$FixedChainStaticTargetInterceptor.intercept(Cglib2AopProxy.java:572)
at flex.messaging.endpoints.AMFEndpoint$$EnhancerByCGLIB$$247a330d.serviceMessage(<generated>)
at flex.messaging.endpoints.amf.MessageBrokerFilter.invoke(MessageBrokerFilter.java:103)
at flex.messaging.endpoints.amf.LegacyFilter.invoke(LegacyFilter.java:158)
at flex.messaging.endpoints.amf.SessionFilter.invoke(SessionFilter.java:44)
at flex.messaging.endpoints.amf.BatchProcessFilter.invoke(BatchProcessFilter.java:67)
at flex.messaging.endpoints.amf.SerializationFilter.invoke(SerializationFilter.java:166)
at flex.messaging.endpoints.BaseHTTPEndpoint.service(BaseHTTPEndpoint.java:291)
at flex.messaging.endpoints.AMFEndpoint$$EnhancerByCGLIB$$247a330d.service(<generated>)
at org.springframework.flex.servlet.MessageBrokerHandlerAdapter.handle(MessageBrokerHandlerAdapter.java:109)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:669)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:585)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at com.springsource.insight.collection.tcserver.request.HttpRequestOperationCollectionValve.traceNextValve(HttpRequestOperationCollectionValve.java:92)
at com.springsource.insight.collection.tcserver.request.HttpRequestOperationCollectionValve.invoke(HttpRequestOperationCollectionValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:409)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at org.pwsz.services.EventService.getAll(EventService.java:19)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at flex.messaging.services.remoting.adapters.JavaAdapter.invoke(JavaAdapter.java:418)
... 47 more
所以问题仍未解决,有人可以帮忙吗?提前谢谢
Finnaly我解决了问题,我更换了blazeds services-config.xml:
<services-config>
<services>
<service id="remoting-service" class="flex.messaging.services.RemotingService">
<default-channels>
<channel ref="my-amf" />
</default-channels>
<adapters>
<adapter-definition id="java-object"
class="flex.messaging.services.remoting.adapters.JavaAdapter"
default="true" />
</adapters>
<destination id="myService" channels="my-amf">
<properties>
<source>org.abc.services.EventService</source>
</properties>
</destination>
</service>
</services>
<channels>
<channel-definition id="my-amf"
class="mx.messaging.channels.AMFChannel">
<endpoint
url="http://{server.name}:{server.port}/{context.root}/messagebroker/amf"
class="flex.messaging.endpoints.AMFEndpoint" />
</channel-definition>
</channels>
</services-config>
通过org.abc.services.EventService
中的注释@RemotingDestination(value="myService",channels={"my-amf"})
我在appContext.xml中也尝试了定义,它也有效:
<flex:remoting-destination destination-id="myService" ref="eventService"/>
但我仍然不明白为什么services-config中的配置不起作用,主要问题是每个AMF请求Spring都在生成新的eventService对象(没有自动装配dao),请注意那些不需要的函数Dao工作得很好。
我的web.xml
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>classpath:log4j.properties</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>rws</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>rws</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>
index.jsp
</welcome-file>
</welcome-file-list>
答案 0 :(得分:0)
如果你不使用注释@RemotingDestination,或者你没有在appContext.xml(或Spring使用的另一个xml)中声明组件,那么Spring框架将无法管理你的bean(也就是inhect属性等)这就是DAO对象为空的原因。对于在“经典”BlazeDS配置文件中声明的所有组件都是如此。