Question

我有一个Spring Boot应用程序，它使用服务器发送的事件将数据流式传输到基于React的前端（React客户端使用EventSource，从后端获取数据并使用实时数据绘制图形），以及当我启动时一段时间后，多个并行流（例如，我开始在浏览器中的多个不同并行选项卡中开始实时绘图）流（有时只是其中的一些）暂停并且不会暂停，直到我用实时流刷新所有选项卡。

当流刷新时，我会收到多个类似这样的异常：

java.lang.IllegalStateException: Calling [asyncError()] is not valid for a request with Async state [MUST_DISPATCH]
    at org.apache.coyote.AsyncStateMachine.asyncError(AsyncStateMachine.java:440) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.coyote.AbstractProcessor.action(AbstractProcessor.java:512) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.coyote.Request.action(Request.java:430) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.catalina.core.AsyncContextImpl.setErrorState(AsyncContextImpl.java:401) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.catalina.connector.CoyoteAdapter.asyncDispatch(CoyoteAdapter.java:239) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.coyote.AbstractProcessor.dispatch(AbstractProcessor.java:241) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:53) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:836) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1747) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
    at java.base/java.lang.Thread.run(Thread.java:835) ~[na:na]

我发现this topic on SO，但是使用Jetty容器并没有帮助，并且在尝试@EnableAdminServer方法时，我在应用程序启动后立即得到了以下提示：

java.lang.NoSuchMethodError: org.springframework.boot.builder.SpringApplicationBuilder.<init>([Ljava/lang/Object;)V
    at org.springframework.cloud.bootstrap.BootstrapApplicationListener.bootstrapServiceContext(BootstrapApplicationListener.java:157)
    at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:98)
    at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:64)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127)
    at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:75)
    at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:54)
    at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:347)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:306)
    at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:139)
    at com.my.MyApplication.main(MyApplication.java:17)

我应该怎么做才能使流并行工作而不会出现问题？有关如何流式传输数据的示例：

@GetMapping(value = "/endpoint/", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
    public Flux getLastData(@PathVariable("cabinNumber") String cabinNumber) {
        return Flux.interval(Duration.ofMillis(1000))
                .map(interval -> someRepository.find());
    }

使用服务器发送事件时，春季“对异步状态为[MUST_DISPATCH]的请求，调用[asyncError（）]无效”

0 个答案: