Question

我尝试创建使用Jetty作为servlet容器的Spring MVC应用程序。我的方法的特点是通过bean在Spring中运行Jetty：

<bean id="server" class="org.mortbay.jetty.Server" destroy-method="stop">

    <property name="connectors">
        <list>
            <bean id="connector" class="org.mortbay.jetty.nio.SelectChannelConnector">
                <property name="port" value="9080" />
            </bean>
        </list>
    </property>

    <property name="handlers">
        <list>
            <ref bean="basicContext" />
        </list>
    </property>
</bean>

<bean name="basicContext" class="org.mortbay.jetty.servlet.Context">
    <property name="contextPath" value="/" />

    <property name="servletHandler">
        <bean class="org.mortbay.jetty.servlet.ServletHandler">
            <property name="servlets">
                <list>
                    <bean class="org.mortbay.jetty.servlet.ServletHolder">
                        <property name="name" value="spring-mvc" />
                        <property name="servlet">
                            <bean class="name.krestjaninoff.hello.util.DispatcherServletWrapper" />
                        </property>
                    </bean>
                </list>
            </property>

            <property name="servletMappings">
                <list>
                    <bean class="org.mortbay.jetty.servlet.ServletMapping">
                        <property name="servletName" value="spring-mvc" />
                        <property name="pathSpec" value="/*" />
                    </bean>
                </list>
            </property>
        </bean>
    </property>

</bean>

要将应用程序上下文传递给我的servlet，我使用实现ContextAware接口的DispatcherServlet的简单包装器：

public class DispatcherServletWrapper extends DispatcherServlet implements
        ApplicationContextAware {
    private static final long serialVersionUID = -5870408422415688046L;

    private ApplicationContext appContext;
    private ServletContext servletContext;

    public void setApplicationContext(ApplicationContext arg0)
            throws BeansException {
        this.appContext = arg0;
    }

    public void setServletContext(ServletContext servletContext) {
        this.servletContext = servletContext;
    }

    @Override
    protected WebApplicationContext createWebApplicationContext(
            WebApplicationContext arg0) throws BeansException {

        GenericWebApplicationContext wac = new GenericWebApplicationContext();
        wac.setParent(appContext);
        wac.refresh();

        return wac;
    }
}

应用程序启动良好，但当我尝试获取某个页面时，我会得到下一个异常：

2010-12-08 09:50:22,684 [29071401@qtp-4084687-0] DEBUG name.krestjaninoff.hello.util.DispatcherServletWrapper
 - org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:671)
 - Could not complete request
java.lang.NullPointerException
        at org.springframework.web.context.support.WebApplicationObjectSupport.getServletContext(WebApplicationObjectSupport.java:124)
        at org.springframework.web.servlet.view.JstlView.exposeHelpers(JstlView.java:135)
        at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:211)
        at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250)
        at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1047)
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:817)
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
        at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
        at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:390)
        at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
        at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
        at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
        at org.mortbay.jetty.Server.handle(Server.java:326)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
        at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:926)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
        at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
        at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)

因此，当JstlView类尝试获取ServletContext时会出现问题。 JstlView实现了ServletContextAware接口，因此他必须了解ServletContext。

在我看来，问题在于没有创建ServletContext实例。有人能帮助我吗？

Jetty下的Spring MVC应用程序中的ServletContext

0 个答案: