包含的启用CDI的Servlet出现以下故障：ContextNotActiveException:Weld-001303:

Question

org.jboss.weld.context.ContextNotActiveException: WELD-001303: No active contexts for scope type javax.enterprise.context.RequestScoped
    at org.jboss.weld.manager.BeanManagerImpl.getContext(BeanManagerImpl.java:708)
    at org.jboss.weld.bean.ContextualInstanceStrategy$DefaultContextualInstanceStrategy.getIfExists(ContextualInstanceStrategy.java:90)
    at org.jboss.weld.bean.ContextualInstanceStrategy$CachingContextualInstanceStrategy.getIfExists(ContextualInstanceStrategy.java:165)
    at org.jboss.weld.bean.ContextualInstance.getIfExists(ContextualInstance.java:63)
    at org.jboss.weld.bean.proxy.ContextBeanInstance.getInstance(ContextBeanInstance.java:83)
...

在我看来，当包含CDI servlet时，CDI servlet的请求上下文没有正确设置，而不是直接接收请求。

我已经搜索了这个网站，也通过谷歌，但没有找到匹配的问题/解决方案。我找到了一个tomcat上下文设置'FirerEquestListenerSonForwards=“true”'，并将其应用到dispatcher servlet中，但这并没有什么不同。

这是配置问题吗？有人能提供如何解决这个问题的线索吗？

有这个问题的实际应用是很大的，所以我把它浓缩到断线的本质。结果，我有两个war文件。第一个war文件包含CDI servlet和dispatcher（在代码中我称之为includer）servlet。第二个war文件只包含dispatcher servlet。

CDI Servlet

CDI Servlet在其META_INF目录中有一个context.xml文件，其内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<Context>
    <Resource name="BeanManager" 
        auth="Container"
        type="javax.enterprise.inject.spi.BeanManager"
        factory="org.jboss.weld.resources.ManagerObjectFactory" />
</Context>

<listener>
  <listener-class>org.jboss.weld.environment.servlet.Listener</listener-class>
</listener>

<resource-env-ref>
    <resource-env-ref-name>BeanManager</resource-env-ref-name>
    <resource-env-ref-type>javax.enterprise.inject.spi.BeanManager</resource-env-ref-type>
</resource-env-ref>

BeanManager bm = null;
try {
    InitialContext context = new InitialContext();

    try {
       // "regular" naming
       bm = (BeanManager) context.lookup("java:comp/BeanManager");
    } catch(NameNotFoundException e) {
       // try again with Tomcat naming
       bm = (BeanManager) context.lookup("java:comp/env/BeanManager");
    }
} catch (Exception e) {}

if (bm == null) {
   writer.write("Couldn't look up the bean manager");
} else {
   Set<Bean<?>> beans = bm.getBeans(EnclosingBean.class);
   @SuppressWarnings("unchecked")
   Bean<EnclosingBean> bean = (Bean<EnclosingBean>) bm.resolve(beans);
   if (bean == null) {
      writer.write("Couldn't get the bean");
   } else {
      EnclosingBean eb = (EnclosingBean) bm.getReference(bean, bean.getBeanClass(), bm.createCreationalContext(bean));
      writer.write("finally here we are. Name is: ");
      writer.write(eb.getName());
   }
}

<?xml version="1.0" encoding="UTF-8"?>
<Context 
   path="/ExternalIncluderServlet" 
   docBase="ExternalIncluderServlet.war" 
   crossContext="true" 
   fireRequestListenersOnForwards="true">

    <Resource name="BeanManager" 
        auth="Container"
        type="javax.enterprise.inject.spi.BeanManager"
        factory="org.jboss.weld.resources.ManagerObjectFactory" />
</Context>

ServletContext sc = request.getServletContext();
ServletContext extsc = sc.getContext("/SimpleCDIServlet");
if (extsc == null) {
   writer.println("<p>Couldn't get the external context.</p>");
} else {

   RequestDispatcher rd = extsc.getRequestDispatcher("/CDIServlet");
   if (rd == null) {
        writer.println("<p>RequestDispatcher is null.</p>");
   } else {
       writer.println("<p>Got the RequestDispatcher.</p>");
       rd.include(req, resp);
   }
}

结果：

当我使用浏览器通过URI:localhost:8080/simplecdiservlet/cdiservlet直接访问CDI servlet时，我会得到预期的输出：

Simple CDI Servlet
finally here we are. Name is: InjectedBean

如果我通过与CDI servlet位于同一web应用程序中的dispatcher servlet访问CDI servlet，它也可以工作。URI：/SimpleCdiservlet/IncluderServlet，输出：

Simple CDI Servlet Including Servlet
Will now include the CDI servlet ...
Got the RequestDispatcher.
Simple CDI Servlet
finally here we are. Name is: InjectedBean

CDI Servlet Includer

This servlet includes a CDI servlet in a different web app. It is not CDI enabled.

Got the RequestDispatcher.
Simple CDI Servlet
finally here we are. Name is: 

                           WAS 8.5           Tomcat 7.0.62           Tomee 1.7.2
                           =======           =============           ===========
CDI servlet direct access   works               works                   works

Included by servlet         works               works                   works          
   in same web app

Included by servlet         works               broken                  broken 
   in different web app

Answer 1

哇哦！在一个好朋友的帮助下，我拿到了！

要使此工作，您需要配置一个特殊的焊接跨上下文过滤器。您可以通过向web.xml文件添加以下行来配置筛选器。

<filter>
   <filter-name>WeldCrossContextFilter</filter-name>
   <filter-class>org.jboss.weld.servlet.WeldCrossContextFilter</filter-class>
</filter>
<filter-mapping>
   <filter-name>WeldCrossContextFilter</filter-name>
   <url-pattern>/*</url-pattern>
   <dispatcher>INCLUDE</dispatcher>
   <dispatcher>FORWARD</dispatcher>
   <dispatcher>ERROR</dispatcher>
</filter-mapping>

当我配置它时，CDI servlet的跨上下文包含会按预期工作。我在Tomcat 7.0.42和8.0.23上试用了它，到目前为止还不错。