当DeferredResult传递给Akka actor时，Spring MVC异步请求间歇性地超时

Question

我已经实现了各种Spring MVC REST端点，以公开返回DeferredResult服务，该服务将移交给Akka TypedActor来完成。 该应用程序已部署到Glassfish 4服务器中。

通常，服务会按预期执行并返回，但是我间歇性地收到以下在我指定的超时间隔内发生的异常：

    WARNING:   Error invoking requestDestroyed method on ServletRequestListener org.jboss.weld.servlet.WeldListener
java.lang.NullPointerException
    at org.jboss.weld.context.AbstractBoundContext.deactivate(AbstractBoundContext.java:71)
    at org.jboss.weld.context.http.HttpRequestContextImpl.deactivate(HttpRequestContextImpl.java:70)
    at org.jboss.weld.servlet.WeldListener.requestDestroyed(WeldListener.java:154)
    at org.apache.catalina.core.StandardContext.fireRequestDestroyedEvent(StandardContext.java:5261)
    at org.apache.catalina.core.StandardHostValve.postInvoke(StandardHostValve.java:255)
    at org.apache.catalina.connector.Request.errorDispatchAndComplete(Request.java:4484)
    at org.apache.catalina.connector.Request.asyncTimeout(Request.java:4424)
    at org.apache.catalina.connector.Request.processTimeout(Request.java:4458)
    at org.apache.catalina.connector.Request.access$000(Request.java:156)
    at org.apache.catalina.connector.Request$6.onTimeout(Request.java:4302)
    at org.glassfish.grizzly.http.server.Response$SuspendTimeout.onTimeout(Response.java:2024)
    at org.glassfish.grizzly.http.server.Response$DelayQueueWorker.doWork(Response.java:2073)
    at org.glassfish.grizzly.http.server.Response$DelayQueueWorker.doWork(Response.java:2068)
    at org.glassfish.grizzly.utils.DelayedExecutor$DelayedRunnable.run(DelayedExecutor.java:158)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:724)

servlet的定义是我的web.xml如下：

<servlet>
    <servlet-name>DispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value/>
    </init-param>
    <load-on-startup>1</load-on-startup>
    <async-supported>true</async-supported>
</servlet>

我的Spring MVC端点之一的示例是：

@RequestMapping(value = "/general", method = RequestMethod.POST, consumes = MediaType.APPLICATION_JSON_VALUE)
@ResponseStatus(HttpStatus.ACCEPTED)
public DeferredResult<String> processGeneralDocuments(@RequestBody DocumentsRequestBody requestBody) {

    DeferredResult<String> result = new DeferredResult<>(appConfig.getDefaultRestTimeout());

    documentsServiceBridge.general(result, requestBody.getDocuments());

    return result;

}

DocumentsStoreBridge TypedActor的general方法的实现如下：

@Override
public void general(DeferredResult<String> result, List<AbstractDocument> documents) {
    LOG.debug("Processing {} general documents...", documents.size());

    try {
        result.setResult(documents.size() + " general documents accepted.");
        LOG.debug("DeferredResult set");
        for (AbstractDocument document : documents) {
            documentStore.get().getActorRef().tell(document, TypedActor.context().self());
            LOG.debug("{} document sent to {}", document.get_id(), documentStore.get().getActorType());
        }
    } catch (Exception e) {
        result.setErrorResult(e);
    }

}

如您在DocumentsStoreBridge实现中所看到的，我几乎立即设置DeferredResult的结果，因此希望可以完成异步请求。

间歇性地实际发生的结果是正确设置了结果，并且我的程序继续进行，但是异步请求未完成，因此，请求超时时，客户端会收到HTTP 500错误。

任何帮助，我们将不胜感激。

Answer 1

升级到GlassFish 4.1之后，此问题现在似乎已解决，我想与4.1打包在一起的WELD的较新版本已包含此修复程序。