https://bz.apache.org/bugzilla/show_bug.cgi?id=67293
Bug ID: 67293
Summary: WsRemoteEndpointImplBase throws IllegalStateException:
WebSocket session has been closed
Product: Tomcat 10
Version: 10.1.11
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: WebSocket
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ------
My client, java.net.http.WebSocket.Listener, is
public onText(WebSocket webSocket,...) { webSocket.abort()
My server (Spring Boot) is
WebSocketSession session;
try {
session.sendText(...)
} catch (IllegalStateException e) {
logger.error("session.isOpen == {}", session.isOpen(), e);
And output is:
session.isOpen == true
java.lang.IllegalStateException: Message will not be sent because the WebSocket
session has been closed
at
org.apache.tomcat.websocket.WsRemoteEndpointImplBase.writeMessagePart(WsRemoteEndpointImplBase.java:450)
Where is a bug?
First, it is strange that however session is still open, I got exception that
session is closed. But I can accept than synchronization may be delayed
Second, I browsed a Javadoc and I found
https://docs.oracle.com/en/java/javase/17/docs/api/java.net.http/java/net/http/WebSocket.html#sendText(java.lang.CharSequence,boolean)
"(...)A CompletableFuture returned from this method can complete exceptionally
with:
IllegalStateException - if there is a pending text or binary send operation or
if the previous binary data does not complete the message
IOException - if an I/O error occurs, or if the output is closed (...)"
Then second problem, a real bug, is that when session is closed, IOexception
should be thrown, not IllegalStateException
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