从线程调用bean时,范围类型javax.enterprise.context.RequestScoped没有活动的上下文

Question

使用Weld-SE 2.1.2.Final获取bean并从线程调用它时,我遇到以下异常:

线程"main"中的异常org.jboss.weld.context.ContextNotActiveException:WELD-001303:范围类型javax.enterprise.context.RequestScoped没有活动的上下文

我的bean用@RequestScooped注释.如果我注释@ApplicationScoped然后它工作正常,但我需要保留@RequestScooped.

这是一个复制者:

public static void main(String[] args) throws Exception {
    Weld weld = new Weld();
    WeldContainer container = weld.initialize();
    final MyPojo pojo = container.instance().select(MyPojo.class).get();

    Thread t = new Thread() {
        public void run() {
            System.out.println(pojo.ping());   // This call fails
        }
    };
    t.start();
    t.join();
    System.out.println(pojo.ping()); // This call succeed
    weld.shutdown();

}

@RequestScoped
public class MyPojo {
 public String ping() {
    return "pong";
 }
}

你遇到过这种行为吗？有什么想让这个工作好吗？

Answer 1

在这种情况下,Weld使用与线程(RequestContext)关联的未绑定RequestContext .您需要在您正在创建的线程中手动初始化新的RequestContext,这对我有用:

public static void main(String[] args) throws Exception {
    Weld weld = new Weld();
    final WeldContainer container = weld.initialize();
    RequestContext requestContext= container.instance().select(RequestContext.class, UnboundLiteral.INSTANCE).get();
    requestContext.activate();

    final MyPojo pojo = container.instance().select(MyPojo.class).get();

    Thread t = new Thread() {
        public void run() {
            RequestContext requestContext= container.instance().select(RequestContext.class, UnboundLiteral.INSTANCE).get();
            requestContext.activate();
            System.out.println("1" + pojo.ping()); 
        }
    };
    t.start();
    t.join();
    System.out.println("2" + pojo.ping());
    weld.shutdown();

}