使用spring用jersey/jax-ws加载jetty时ServletContext为null

Question

我们正在使用 spring 来配置 jetty 并加载所有内容，我正在尝试使用 jersey 进行 Web 服务并使用 jetty/spring 库，以便我可以将一些服务类自动连接到我的 jersey 资源中，但我遇到了麻烦启动服务器，因为它总是说 ServletContext 为 null。

这是我的 spring 配置 xml：

        <property name="handler">
        <bean id="handlers" class="org.eclipse.jetty.server.handler.HandlerList">
            <property name="handlers">
                <list>
                    <bean class="org.eclipse.jetty.servlet.ServletContextHandler">
                        <property name="eventListeners">
                            <list>
                                <bean class="org.springframework.web.context.ContextLoaderListener" />
                                <bean
                                    class="org.springframework.web.context.request.RequestContextListener" />
                            </list>
                        </property>
                        <property name="initParams">
                            <map>
                                <entry>
                                    <key>
                                        <value>contextConfigLocation</value>
                                    </key>
                                    <value>classpath:applicationContext.xml</value>
                                </entry>
                            </map>
                        </property>
                    </bean>
                    <bean class="org.eclipse.jetty.servlet.ServletHandler">



                        <property name="servlets">
                            <list>
                                <bean class="org.eclipse.jetty.servlet.ServletHolder">
                                    <property name="name" value="Jersey" />
                                    <property name="servlet">
                                        <bean
                                            class="com.sun.jersey.spi.spring.container.servlet.SpringServlet" />
                                    </property>
                                    <property name="initParameters">
                                        <map>
                                            <entry>
                                                <key>
                                                    <value>com.sun.jersey.config.property.packages</value>
                                                </key>
                                                <value>com.mycompany.ws.resource</value>
                                            </entry>
                                            <entry>
                                                <key>
                                                    <value>contextConfigLocation</value>
                                                </key>
                                                <value>classpath:applicationContext.xml</value>
                                            </entry>
                                        </map>
                                    </property>

                                </bean>
                            </list>
                        </property>

我按照此处的说明进行操作： http://blogs.oracle.com/enterprisetechtips /entry/jersey_and_spring 来集成jersey和spring，但不同的是我有一个配置了spring的嵌入式jetty服务器。

我不知道为什么我不断收到以下错误。我认为 jetty ServletContextHandler 是他们文档中的 servlet 上下文。

2010-11-30 23:19:05,177 [Thread-0] INFO  [org.springframework.web.context.ContextLoader]: Root WebApplicationContext: initialization completed in 177 ms
Nov 30, 2010 11:19:05 PM com.sun.jersey.api.core.PackagesResourceConfig init
INFO: Scanning for root resource and provider classes in the packages:
  com.traveladnetwork.ws.resource.ad.server
Nov 30, 2010 11:19:05 PM com.sun.jersey.api.core.PackagesResourceConfig init
INFO: Root resource classes found:
  class com.mycompany.ws.resource.TargetResource
  class com.mycompany.ws.resource.ReportResource
  class com.mycompany.ws.resource.HelloWorldResource
Nov 30, 2010 11:19:05 PM com.sun.jersey.api.core.PackagesResourceConfig init
INFO: Provider classes found:
Nov 30, 2010 11:19:05 PM com.sun.jersey.spi.spring.container.servlet.SpringServlet getContext
INFO: Creating new child context from classpath:applicationContext.xml
Nov 30, 2010 11:19:05 PM com.sun.jersey.spi.spring.container.servlet.SpringServlet initiate
**SEVERE: Exception occurred when intialization
java.lang.IllegalArgumentException: ServletContext must not be null**
    at org.springframework.util.Assert.notNull(Assert.java:112)
    at org.springframework.web.context.support.WebApplicationContextUtils.getWebApplicationContext(WebApplicationContextUtils.java:96)
    at org.springframework.web.context.support.WebApplicationContextUtils.getWebApplicationContext(WebApplicationContextUtils.java:86)
    at org.springframework.web.context.support.WebApplicationContextUtils.getRequiredWebApplicationContext(WebApplicationContextUtils.java:68)
    at com.sun.jersey.spi.spring.container.servlet.SpringServlet.getDefaultContext(SpringServlet.java:128)
    at com.sun.jersey.spi.spring.container.servlet.SpringServlet.getChildContext(SpringServlet.java:119)
    at com.sun.jersey.spi.spring.container.servlet.SpringServlet.getContext(SpringServlet.java:113)
    at com.sun.jersey.spi.spring.container.servlet.SpringServlet.initiate(SpringServlet.java:99)
    at com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:253)
    at com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:521)
    at com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:199)
    at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:308)
    at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:471)
    at javax.servlet.GenericServlet.init(GenericServlet.java:241)
    at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:421)
    at org.eclipse.jetty.servlet.ServletHolder.doStart(ServletHolder.java:245)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)
    at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:699)
    at org.eclipse.jetty.servlet.ServletHandler.doStart(ServletHandler.java:155)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)
    at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:165)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)
    at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:92)
    at org.eclipse.jetty.server.Server.doStart(Server.java:228)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeCustomInitMethod(AbstractAutowireCapableBeanFactory.java:1414)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1375)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1335)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:473)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:429)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:728)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:380)
    at com.mycompany.common.service.SpringServiceImpl.startService(SpringServiceImpl.java:52)
    at com.traveladnetwork.common.service.StartImpl.run(StartImpl.java:42)
    at java.lang.Thread.run(Thread.java:637)
2010-11-30 23:19:05.412:INFO::Started [email protected]:9932
2010-11-30 23:19:05,413 [Thread-0] INFO  [com.mycompany.common.service.StartImpl]: Started in 1950 ms

Answer 1

可能是因为您在 Spring 中运行 servlet 容器（而不是相反），所以它无法找到 ServletContext。

您有两个选择：

1. 尝试使用编程引导程序启动 Jetty，该引导程序在其 Servlet 上下文中加载 Spring (使用 Jetty 以编程方式部署 servlet)
2. 将 applicationContext.xml 拆分为两个容器定义：启动 Jetty 所需的容器和没有有效 ServletContext 则无法启动的容器定义。需要有效servlet上下文的可能应该在bean类“ServletContextHandler”的“initParams”中，而目前您已经定义了两次相同的applicationContext.xml。