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我必须以编程方式从 servlet 中查找由 CDI 管理的会话范围 bean。

到目前为止，我已经设法使用 BeanManager 实例查找默认范围的 bean。但是对于会话范围的 bean，查找失败并显示以下消息：

org.jboss.weld.context.ContextNotActiveException: WELD-001303 No active contexts for scope type javax.enterprise.context.SessionScoped
    org.jboss.weld.manager.BeanManagerImpl.getContext(BeanManagerImpl.java:598)
    org.jboss.weld.bean.proxy.ContextBeanInstance.getInstance(ContextBeanInstance.java:71)
    org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:79)
    de.eb.mdsd.prototype.server.SessionStuff$Proxy$_$$_WeldClientProxy.test(SessionStuff$Proxy$_$$_WeldClientProxy.java)
    de.eb.mdsd.prototype.server.FooServlet.doGet(FooServlet.java:21)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:734)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
    org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
    org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
    org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
    org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
    org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)
    org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
    org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)

有没有办法手动设置活动会话范围？该应用程序当前在 JBoss 7 上运行，因此 CDI 实现是 Weld，但是最好使用不限于 Weld 的通用解决方案。

这是我到目前为止一直在使用的代码：

public class FooServlet extends HttpServlet {

    private static final long   serialVersionUID    = 1L;

    @Override
    protected void doGet(final HttpServletRequest req, final HttpServletResponse resp) throws ServletException, IOException {
        final SessionStuff sessionStuff = lookup(SessionStuff.class);
        sessionStuff.test();
    }

    private BeanManager getBeanManager() {
        try {
            return (BeanManager) InitialContext.doLookup("java:comp/BeanManager");
        }
        catch (final NamingException e) {
            throw Exceptions.propagate(e);
        }
    }

    @SuppressWarnings("unchecked")
    private <T> T lookup(final Class<T> clazz) {
        final BeanManager bm = getBeanManager();
        final Iterator<Bean<?>> iter = bm.getBeans(clazz).iterator();
        if (!iter.hasNext()) {
            throw new IllegalStateException("CDI BeanManager cannot find an instance of requested type " + clazz.getName());
        }
        final Bean<T> bean = (Bean<T>) iter.next();
        final CreationalContext<T> ctx = bm.createCreationalContext(bean);
        return (T) bm.getReference(bean, clazz, ctx);
    }

}
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