从线程调用 bean 时，范围类型 javax.enterprise.context.RequestScoped 没有活动上下文
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No active contexts for scope type javax.enterprise.context.RequestScoped when invoking a bean from a thread
提问by Nader
While using Weld-SE 2.1.2.Final to obtain a bean and to invoke it from a thread, I encounter the following exception:
在使用 Weld-SE 2.1.2.Final 获取 bean 并从线程调用它时，我遇到以下异常：
Exception in thread "main" org.jboss.weld.context.ContextNotActiveException: WELD-001303: No active contexts for scope type javax.enterprise.context.RequestScoped
线程“main” org.jboss.weld.context.ContextNotActiveException 中的异常：WELD-001303：范围类型 javax.enterprise.context.RequestScoped 没有活动上下文
My bean is annotated with @RequestScooped. If I annotate @ApplicationScoped then it works fine, but I need to keep @RequestScooped.
我的 bean 用 @RequestScooped 注释。如果我注释@ApplicationScoped，那么它工作正常，但我需要保留@RequestScooped。
Here is a reproducer :
这是一个复制器：
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";
}
}
Did you encounter this behavior? Any idea to make this work please?
你遇到过这种行为吗？有什么想法可以使这项工作吗？
采纳答案by kaos
In this case Weld is using unbound RequestContext that is associated with a thread (RequestContext). You need to manually initialize new RequestContext in a thread that You're creating, this works for me:
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();
}
