java - 使用应用程序 Tomcat 时出现奇怪的错误

Question

我启动 tomcat，当加载第一页时，错误显示:

Jan 05, 2014 9:15:01 PM org.apache.catalina.core.StandardWrapperValve invoke
Grave: Servlet.service() for servlet [Faces Servlet] in context with path [/odontonew] threw exception
java.lang.IllegalStateException
    at org.apache.catalina.connector.ResponseFacade.setBufferSize(ResponseFacade.java:252)
    at com.sun.faces.context.ExternalContextImpl.setResponseBufferSize(ExternalContextImpl.java:799)

错误发生在这个Filer

public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        // HttpServletRequest req = (HttpServletRequest) request;
        //
        if (((HttpServletRequest) request).getRequestURI().contains(
                "security/form_login.xhtml")) {
            chain.doFilter(request, response);
            return;
        }

        UsuarioMBImpl usuarioMB = (UsuarioMBImpl) ((HttpServletRequest) request)
                .getSession().getAttribute("usuarioMB");

        if (usuarioMB == null || !usuarioMB.isLoggedIn()) {
            String contextPath = ((HttpServletRequest) request)
                    .getContextPath();
            ((HttpServletResponse) response).sendRedirect(contextPath
                    + "/security/form_login.xhtml");
        }

        chain.doFilter(request, response);
    }

如果我对所有内容进行评论并仅让“chain.doFilter..”一切正常。

Answer 1

尝试在调用 sendRedirect() 之后添加一个 return 语句:

    if (usuarioMB == null || !usuarioMB.isLoggedIn()) {
        String contextPath = ((HttpServletRequest) request).getContextPath();
        ((HttpServletResponse) response).sendRedirect(contextPath
                + "/security/form_login.xhtml");
        return;
    }