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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Stabilize flaky test: McpCompletionTests.testCompletionErrorOnMissingContext","articleBody":" McpCompletionTests.testCompletionErrorOnMissingContext is sometimes failing and recovers after simple build restart.\n` **Error:** Session not found: \u003csessionId\u003e`\n\nLikely causes:\nThe server removes the session when SSE connection closes, but the client still has pending requests in flight. This is a race condition between:\n- SSE connection closing → server removes session\n- Client sending next request → \"Session not found\"\n\n```\n2026-02-09 23:31:09 [HttpClient-1-Worker-0] WARN  i.m.c.t.HttpClientSseClientTransport - SSE stream observed an error\njava.io.IOException: chunked transfer encoding, state: READING_LENGTH\n\tat java.net.http/jdk.internal.net.http.common.Utils.wrapWithExtraDetail(Utils.java:375)\n\tat java.net.http/jdk.internal.net.http.Http1Response$BodyReader.onReadError(Http1Response.java:660)\n\tat java.net.http/jdk.internal.net.http.Http1AsyncReceiver.checkForErrors(Http1AsyncReceiver.java:302)\n\tat java.net.http/jdk.internal.net.http.Http1AsyncReceiver.flush(Http1AsyncReceiver.java:268)\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler$LockingRestartableTask.run(SequentialScheduler.java:205)\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler$CompleteRestartableTask.run(SequentialScheduler.java:149)\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler$SchedulableTask.run(SequentialScheduler.java:230)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)\n\tat java.base/java.lang.Thread.run(Thread.java:840)\nCaused by: java.io.EOFException: EOF reached while reading\n\tat java.net.http/jdk.internal.net.http.Http1AsyncReceiver$Http1TubeSubscriber.onComplete(Http1AsyncReceiver.java:597)\n\tat java.net.http/jdk.internal.net.http.SocketTube$InternalReadPublisher$ReadSubscription.signalCompletion(SocketTube.java:648)\n\tat java.net.http/jdk.internal.net.http.SocketTube$InternalReadPublisher$InternalReadSubscription.read(SocketTube.java:853)\n\tat java.net.http/jdk.internal.net.http.SocketTube$SocketFlowTask.run(SocketTube.java:181)\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler$SchedulableTask.run(SequentialScheduler.java:230)\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:303)\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:256)\n\tat java.net.http/jdk.internal.net.http.SocketTube$InternalReadPublisher$InternalReadSubscription.signalReadable(SocketTube.java:782)\n\tat java.net.http/jdk.internal.net.http.SocketTube$InternalReadPublisher$ReadEvent.signalEvent(SocketTube.java:965)\n\tat java.net.http/jdk.internal.net.http.SocketTube$SocketFlowEvent.handle(SocketTube.java:253)\n\tat java.net.http/jdk.internal.net.http.HttpClientImpl$SelectorManager.handleEvent(HttpClientImpl.java:1402)\n\tat java.net.http/jdk.internal.net.http.HttpClientImpl$SelectorManager.lambda$run$3(HttpClientImpl.java:1347)\n\tat java.base/java.util.ArrayList.forEach(ArrayList.java:1511)\n\tat java.net.http/jdk.internal.net.http.HttpClientImpl$SelectorManager.run(HttpClientImpl.java:1347)\n2026-02-09 23:31:09 [ForkJoinPool.commonPool-worker-1] ERROR i.m.c.t.HttpClientSseClientTransport - Error sending message: Sending message failed with a non-OK HTTP code: 404 - {\"cause\":null,\"jsonRpcError\":null,\"localizedMessage\":\"Session not found: 7a9438d6-5965-456a-99af-26523f108d68\",\"message\":\"Session not found: 7a9438d6-5965-456a-99af-26523f108d68\",\"stackTrace\":\n```\nhttps://github.com/modelcontextprotocol/java-sdk/actions/runs/21845041347/job/63038831474#step:4:15277\n","author":{"url":"https://github.com/ashakirin","@type":"Person","name":"ashakirin"},"datePublished":"2026-04-04T12:38:06.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":14},"url":"https://github.com/902/java-sdk/issues/902"}