WebApplicationInitializer被重复调用

Z时代
2024-01-10
分类：问答

我在Tomcat 7.x（最新版本）下托管了一个基于Spring 3.1的应用程序。该应用程序仅使用Java配置（否web.xml，没有Spring

XML配置）。所有单元测试都通过了，包括使用Spring Java配置（@ContextConfiguration）的测试。

问题在于，在部署应用程序时，将多次

调用WebApplicationInitializer实现。过滤器和侦听器的重复注册会导致异常，并且应用程序永远不会启动。

我不希望WebApplicationInitializer.onStartup()再被打来电话，如果可能的话，我想消除这种行为。如果有人对为什么会发生这种情况以及如何阻止它提出建议，我将非常感激。

我相信问题出在初始化类本身之外，但是在这里是万一我弄错了…

public class DeploymentDescriptor implements WebApplicationInitializer {
    private static final Logger LOGGER = LoggerFactory.getLogger("org.ghc.web-app-initializer");
    @Override
    public void onStartup (ServletContext servletContext) throws ServletException {
        // This is the programmatic way of declaring filters. This allows you to order
        // Filters. The order of these security filters DOES MATTER!
        FilterRegistration.Dynamic mockSecurityFilter       = servletContext.addFilter ("mockSecurityFilter", "org.ghc.security.MockSecurityFilter");
        mockSecurityFilter.addMappingForUrlPatterns         (EnumSet.of (REQUEST), true, "/*");
        FilterRegistration.Dynamic siteMinderSecurityFilter = servletContext.addFilter ("siteMinderSecurityFilter", "org.ghc.security.SiteMinderSecurityFilter");
        siteMinderSecurityFilter.addMappingForUrlPatterns   (EnumSet.of (REQUEST), true, "/*");
        FilterRegistration.Dynamic userDetailsStoreFilter   = servletContext.addFilter ("userDetailsStoreFilter", "org.ghc.security.UserDetailsStoreFilter");
        userDetailsStoreFilter.addMappingForUrlPatterns     (EnumSet.of (REQUEST), true, "/*");
        // Static resource handling using "default" servlet
        servletContext.getServletRegistration ("default").addMapping ("*.js", "*.css", "*.jpg", "*.gif", "*.png");
        // Map jspf files to jsp servlet
        servletContext.getServletRegistration ("jsp").addMapping ("*.jspf");
        // Spin up the Spring 3.1 class that can scan a package tree for classes
        // annotated with @Configuration. See org.ghc.spring3.ControllerConfiguration for
        // this example.
        final AnnotationConfigWebApplicationContext dispatcherContext = new AnnotationConfigWebApplicationContext ();
        dispatcherContext.setServletContext (servletContext);
        dispatcherContext.register(ScProviderDirectory.class);
        dispatcherContext.refresh ();
        // Spin up the Spring DispatcherServlet (just like before) passing the just built
        // application context. Load it like the regular Servlet that it is!
        final ServletRegistration.Dynamic servlet = servletContext.addServlet ("spring", new DispatcherServlet(dispatcherContext));
        servlet.setLoadOnStartup (1);
        servlet.addMapping ("/");  // Make sure this is NOT "/*"!
    }
}

这只是很奇怪。Tomcat日志似乎标识了我的DeploymentDescriptor类的两个实例。我验证了.war文件中只有该类的一个实例。我不知道第二个（幻像）实例从哪里来，但是至少这解释了

为什么 该类被扫描两次…

logs/localhost.2012-10-09.log:INFO: Spring WebApplicationInitializers detected on classpath: [org.ghc.configuration.DeploymentDescriptor@3b29642c] logs/localhost.2012-10-09.log:INFO: Spring WebApplicationInitializers detected on classpath: [org.ghc.configuration.DeploymentDescriptor@432c4c7a]