https://issues.apache.org/bugzilla/show_bug.cgi?id=55638
Bug ID: 55638
Summary: [websocket] Tomcat corrupts binary websocket messages
when using the NIO connector
Product: Tomcat 8
Version: trunk
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: WebSocket
Assignee: dev@tomcat.apache.org
Reporter: kpreis...@apache.org
Created attachment 30907
--> https://issues.apache.org/bugzilla/attachment.cgi?id=30907&action=edit
Test case
When writing a binary websocket message with about 25 KB, the client will get
corrupted data starting on Offset 0x2000 when running Tomcat with the NIO
connector.
To reproduce:
1) Checkout current trunk (r1529816) and apply the attached patch locally. This
will modify the Echo example so that the JavaScript sends a Base64-encoded
String to Tomcat, and Tomcat will decode it as byte[] array and send it back
using a binary websocket message. The JavaScript will then compare each byte
and report if differences are found.
2) Start Tomcat using the NIO connector on 64-Bit Windows with a 64-bit JVM.
3) Open the Echo example (http://localhost:8080/examples/websocket/echo.xhtml)
with Firefox or Chrome.
4) The page will print lines such as the following:
Offset 0x2000: Excepted [0x80] but got [0x89]
Offset 0x2001: Excepted [0xE4] but got [0x50]
Offset 0x2002: Excepted [0x69] but got [0x4E]
Offset 0x2003: Excepted [0xDD] but got [0x47]
Offset 0x2004: Excepted [0x8F] but got [0x0D]
Offset 0x2005: Excepted [0x9A] but got [0x0A]
[...]
This indicates that there were differences between the sent and the received
message.
5) If you try this with the APR connector, the page will print: "No errors
found."
so with APR the problems don't occur.
If you try this with the BIO connector (and repeatedly press F5 in Firefox),
the page will sometimes print "No errors found", but sometimes it will print
nothing as then Tomcat did not call the EchoAnnotation#echoMessage method.
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