Question

我正在尝试在spring 4 webmvc应用程序中使用java配置。在Internet上浏览一些示例后，我有以下WebAppApplicationInitializer。



public class AppInit implements WebApplicationInitializer {
    private static final String CONFIG_LOCATION = "spring.examples.config";
    private static final String MAPPING_URL = "/rest/*";

    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        WebApplicationContext context = getContext();
        servletContext.addListener(new ContextLoaderListener(context));
        ServletRegistration.Dynamic dispatcher = servletContext.addServlet("DispatcherServlet", new DispatcherServlet(context));
        dispatcher.setLoadOnStartup(1);
        dispatcher.addMapping(MAPPING_URL);
    }

    private AnnotationConfigWebApplicationContext getContext() {
        AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();
        context.setConfigLocation(CONFIG_LOCATION);
        return context;
    }

public class AppInit implements WebApplicationInitializer { private static final String CONFIG_LOCATION = "spring.examples.config"; private static final String MAPPING_URL = "/rest/*"; @Override public void onStartup(ServletContext servletContext) throws ServletException { WebApplicationContext context = getContext(); servletContext.addListener(new ContextLoaderListener(context)); ServletRegistration.Dynamic dispatcher = servletContext.addServlet("DispatcherServlet", new DispatcherServlet(context)); dispatcher.setLoadOnStartup(1); dispatcher.addMapping(MAPPING_URL); } private AnnotationConfigWebApplicationContext getContext() { AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext(); context.setConfigLocation(CONFIG_LOCATION); return context; }

它在jetty，tomcat中运行良好，但是当我使用树脂4.0.40时。 Web服务器显示以下错误：

当我评论这一行时 java.lang.IllegalStateException: Cannot initialize context because there is already a root application context present - check whether you have multiple ContextLoader* definitions in your web.xml! at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:277) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106) at com.caucho.server.webapp.WebApp.fireContextInitializedEvent(WebApp.java:3777) at com.caucho.server.webapp.WebApp.startImpl(WebApp.java:3687) at com.caucho.server.webapp.WebApp.access$400(WebApp.java:207) at com.caucho.server.webapp.WebApp$StartupTask.run(WebApp.java:5234) at com.caucho.env.thread2.ResinThread2.runTasks(ResinThread2.java:173) at com.caucho.env.thread2.ResinThread2.run(ResinThread2.java:118)

servletContext.addListener(new ContextLoaderListener(context));

一切正常。

问题是将监听器添加到servlet上下文的目的是什么？将侦听器添加到servlet上下文是否错误？

Answer 1

问题是树脂4.0.40中的错误http://bugs.caucho.com/view.php?id=5611。 ServletContextListener#contextInitialized()打了两次电话。在树脂4.0.41中一切正常

在Spring中添加监听器到servlet上下文

1 个答案: