I did some debugging: for Java 8 (failing) and Java 11+ (OK), the test
case testIPv6LinkLocal use the same link local address in
TestStartupIPv6Connectors. For example:
fe80:0:0:0:2e0:4cff:fee2:a74a%enx00e04ce2a74a
But in org.apache.coyote.AbstractProcessor.parseHost(), different values
appear. For Java 8:
[fe80:0:0:0:2e0:4cff:fee2:a74a%enx00e04ce2a74a]:PORTNUM
For Java 11+:
[fe80:0:0:0:2e0:4cff:fee2:a74a]:PORTNUM
The thread name in both cases is
http-nio-fe80:0:0:0:2e0:4cff:fee2:a74a%enx00e04ce2a74a-auto-3-exec-1.
The % character in the Java 8 case leads to a failure in parseHost
(german error strings):
[junit] 23-Jan-2026 14:09:43.062 INFORMATION
[http-nio-fe80:0:0:0:2e0:4cff:fee2:a74a%enx00e04ce2a74a-auto-3-exec-1]
org.apache.coyote.AbstractProcessor.parseHost Der Host
[[fe80:0:0:0:2e0:4cff:fee2:a74a%enx00e04ce2a74a]:38323] ist nicht gültig.
[junit] Info: Weitere Vorkommen von Fehlern beim Parsen der
Anfragen werden mit DEBUG Level ausgegeben
[junit] java.lang.IllegalArgumentException: Das Zeichen [%] ist
kein valides Zeichen in einer IPv6 Addresse.
[junit] at
org.apache.tomcat.util.http.parser.HttpParser.readHostIPv6(HttpParser.java:901)
Some there is some conversion involved for the more modern Java
versions, that prevent the failure.
Regards,
Rainer
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