java.util.concurrent.ExecutionException: java.io.IOException: Connection closed at java.util.concurrent.CompletableFuture.reportGet(java.base@9-internal/CompletableFuture.java:395) at java.util.concurrent.CompletableFuture.get(java.base@9-internal/CompletableFuture.java:1999)

JDK Bug System | Felix Yang | 6 months ago
tip
Click on the to mark the solution that helps you, Samebug will learn from it.
As a community member, you’ll be rewarded for you help.
  1. 0

    This can be reproduced with following WebSocket scenario. But I don't think it is only a WebSocket problem. It looks to be a problem in current java.net.http.*HttpConnection implementation //A simple test to reproduce the problem public class WSReconnectTest { public static void main(String[] args) throws Exception { String wsURL = "your_ws_endpoint"; connect(wsURL); connect(wsURL); } /** * Tests send and receive plain text messages with different length. * @throws Exception */ static void connect(String url) throws Exception { Listener l = new Listener() { @Override public void onError(WebSocket webSocket, Throwable error) { System.err.println(error); error.printStackTrace(); } }; URI uri = new URI(url); WebSocket ws= WebSocket.newBuilder(uri, l).buildAsync().get(); ws.sendClose().get(); } } It will fail immediately at the second connect attempt. Please refer to the test output:----------System.err:(24/1946)---------- java.util.concurrent.ExecutionException: java.io.IOException: Connection closed at java.util.concurrent.CompletableFuture.reportGet(java.base@9-internal/CompletableFuture.java:395) at java.util.concurrent.CompletableFuture.get(java.base@9-internal/CompletableFuture.java:1999) at WSReconnectTest.connect(WSReconnectTest.java:58) at WSReconnectTest.main(WSReconnectTest.java:42) at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(java.base@9-internal/Native Method) at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(java.base@9-internal/NativeMethodAccessorImpl.java:62) at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(java.base@9-internal/DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(java.base@9-internal/Method.java:535) at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:110) at java.lang.Thread.run(java.base@9-internal/Thread.java:843) Caused by: java.io.IOException: Connection closed at java.net.http.Http1Response.readHeaders(java.httpclient@9-internal/Http1Response.java:72) at java.net.http.Http1Exchange.lambda$getResponseAsyncImpl$0(java.httpclient@9-internal/Http1Exchange.java:190) at java.net.http.Utils.lambda$singleThreadExecutor$5(java.httpclient@9-internal/Utils.java:495) at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@9-internal/ThreadPoolExecutor.java:1158) at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@9-internal/ThreadPoolExecutor.java:632) at java.lang.Thread.run(java.base@9-internal/Thread.java:843) at jdk.internal.misc.InnocuousThread.run(java.base@9-internal/InnocuousThread.java:122) "java.io.IOException: Connection closed" is the cause of failing to reconnect. According java.net.http.HttpConnection.getConnectionImpl(xxx), it will try to get pooled connection if exists. But the pooled connection never got removed during closing connection. So the next attempt to connect will get the same connection which has been closed.

    JDK Bug System | 6 months ago | Felix Yang
    java.util.concurrent.ExecutionException: java.io.IOException: Connection closed at java.util.concurrent.CompletableFuture.reportGet(java.base@9-internal/CompletableFuture.java:395) at java.util.concurrent.CompletableFuture.get(java.base@9-internal/CompletableFuture.java:1999)

    Root Cause Analysis

    1. java.util.concurrent.ExecutionException

      java.io.IOException: Connection closed at java.util.concurrent.CompletableFuture.reportGet(java.base@9-internal/CompletableFuture.java:395) at java.util.concurrent.CompletableFuture.get(java.base@9-internal/CompletableFuture.java:1999)

      at WSReconnectTest.connect()
    2. Unknown
      WSReconnectTest.main
      1. WSReconnectTest.connect(WSReconnectTest.java:58)
      2. WSReconnectTest.main(WSReconnectTest.java:42)
      2 frames