https://bz.apache.org/bugzilla/show_bug.cgi?id=66276
Bug ID: 66276
Summary: Intermittent ClassCastException with HTTP/2 streams
Product: Tomcat 9
Version: 9.0.55
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: -----
Overview: When Tomcat is configured to use HTTP/2, the following errors will
occasionally be seen in the application logs:
2022-09-04 09:28:59.481 FATAL [http-exec-36] Unhandled exception in thread
"http-exec-36": java.lang.ClassCastException:
org.apache.coyote.http2.RecycledStream cannot be cast to
org.apache.coyote.http2.Stream
java.lang.ClassCastException: org.apache.coyote.http2.RecycledStream cannot be
cast to org.apache.coyote.http2.Stream
at
org.apache.coyote.http2.AbstractNonZeroStream.rePrioritise(AbstractNonZeroStream.java:79)
at
org.apache.coyote.http2.Http2UpgradeHandler.reprioritise(Http2UpgradeHandler.java:1651)
at
org.apache.coyote.http2.Http2AsyncUpgradeHandler.reprioritise(Http2AsyncUpgradeHandler.java:41)
at
org.apache.coyote.http2.Http2Parser.readPriorityFrame(Http2Parser.java:299)
at
org.apache.coyote.http2.Http2AsyncParser$FrameCompletionHandler.completed(Http2AsyncParser.java:254)
at
org.apache.coyote.http2.Http2AsyncParser$FrameCompletionHandler.completed(Http2AsyncParser.java:164)
at
org.apache.tomcat.util.net.SocketWrapperBase$VectoredIOCompletionHandler.completed(SocketWrapperBase.java:1113)
at
org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper$NioOperationState.run(NioEndpoint.java:1634)
at
org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
at
org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:750)
Steps to reproduce: Enable HTTP/2 connections, and view the application logs
after it has been running for a period of time.
Actual Results: No obvious affect on the application. Appears to be an
intermittent error.
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