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Java EE Application to extract useful financial items from any types of online or real-time data.

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Subtask of #1 : change design : make use of ping-pong to get stock prices

Bug of #1 : ManagedExecutorService cannot be injected into the server endpoint POJO

Error in the backend log when sending request to http:localhost:8080/investment/prices.xhtml

19:20:23,437 ERROR [io.undertow.websockets.core.request] (default task-2) UT025007: Unhandled exception for annotated endpoint rx.investment.StockPriceMonitor@5c4c88d1: java.lang.NullPointerException: Cannot invoke "jakarta.enterprise.concurrent.ManagedExecutorService.execute(java.lang.Runnable)" because "this.executor" is null
	at deployment.investment.war//rx.investment.StockPriceMonitor.repeatSend(StockPriceMonitor.java:24)
	at deployment.investment.war//rx.investment.StockPriceMonitor.open(StockPriceMonitor.java:21)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at [email protected]//io.undertow.websockets.jsr.annotated.BoundMethod.invoke(BoundMethod.java:87)
	at [email protected]//io.undertow.websockets.jsr.annotated.AnnotatedEndpoint$3.run(AnnotatedEndpoint.java:158)
	at [email protected]//io.undertow.websockets.jsr.ServerWebSocketContainer$1.call(ServerWebSocketContainer.java:170)
	at [email protected]//io.undertow.websockets.jsr.ServerWebSocketContainer$1.call(ServerWebSocketContainer.java:167)
	at [email protected]//io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
	at [email protected]//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1435)
	at [email protected]//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1435)
	at [email protected]//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1435)
	at [email protected]//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1435)
	at [email protected]//io.undertow.websockets.jsr.ServerWebSocketContainer.invokeEndpointMethod(ServerWebSocketContainer.java:618)
	at [email protected]//io.undertow.websockets.jsr.ServerWebSocketContainer$6.run(ServerWebSocketContainer.java:604)
	at [email protected]//io.undertow.websockets.jsr.OrderedExecutor$ExecutorTask.run(OrderedExecutor.java:67)
	at [email protected]//org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
	at [email protected]//org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1990)
	at [email protected]//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
	at [email protected]//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377)
	at [email protected]//org.xnio.XnioWorker$WorkerThreadFactory$1$1.run(XnioWorker.java:1282)
	at java.base/java.lang.Thread.run(Thread.java:833)

19:20:23,440 INFO  [stdout] (default task-2) Received message: check if executor is still null: null

=> the backend loop for polling price cannot work since the new thread is not started successfully

Make a simple page to display stock of one company dynamically with WebSocket

TODO

Make use of a separate container-managed thread to send stock data in an endless loop as the first step. At the first step, the stock data is only dummy text

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