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我正在尝试使用 PrimeFaces 3.5 让 Spring 3.2.3 项目在 Tomcat 7.0.42 上运行，但我遇到了这个错误：

java.lang.IllegalStateException: Could not find backup for factory javax.faces.context.FacesContextFactory. 
    javax.faces.FactoryFinder$FactoryManager.getFactory(FactoryFinder.java:1135)
    javax.faces.FactoryFinder.getFactory(FactoryFinder.java:379)
    javax.faces.webapp.FacesServlet.init(FacesServlet.java:350)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1852)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    java.lang.Thread.run(Thread.java:724)

这是我的 WebApplicationInitializer：

import javax.faces.webapp.FacesServlet;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;

import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.ContextLoaderListener;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;

public class Initializer implements WebApplicationInitializer {

    private static final String JSF_SERVLET_NAME = "jsf";
    private static final String JSF_SERVLET_MAPPING = "*.xhtml";

    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        AnnotationConfigWebApplicationContext rootContext =
                new AnnotationConfigWebApplicationContext();
        rootContext.register(Config.class);

        ServletRegistration.Dynamic jsf = servletContext.addServlet(
                JSF_SERVLET_NAME, new FacesServlet());
        jsf.addMapping(JSF_SERVLET_MAPPING);
        servletContext.setInitParameter("javax.faces.STATE_SAVING_METHOD", "client");

        servletContext.addListener(new ContextLoaderListener(rootContext));
    }

}

我试图servletContext.addListener(new ConfigureListener());在我的 WebApplicationInitializer 类上添加一行，但是该项目有时有效，有时无效。

我正在使用 2.2.1 版本的 jsf（jsf-api 和 jsf-impl）。

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