https://bz.apache.org/bugzilla/show_bug.cgi?id=64061
Bug ID: 64061
Summary: sendMessageBlock throws NPE and it results in
IllegalStateException of TEXT_PARTIAL_WRITING
Product: Tomcat 9
Version: 9.0.21
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: WebSocket
Assignee: dev@tomcat.apache.org
Reporter: ende...@gmail.com
Target Milestone: -----
I implemented a backend server using SpringBoot and Tomcat.
On the server, I used Kafka as a backend message stream and when the backend
gets a new message from Kafka, it sends a message to a browser through
Websocket protocol.
Sometimes, calling sendMessageBlock throws an NPE. And right after that, the
server also throws another IllegalState. I think this is because NPE caused
inconsistent state (TEXT_PARTIAL_WRITING).
To manage sessions' subscriptions and publish, I'm using synchronized(obj)
method.
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