[🐛 Bug]: Selenium Server Jar is "not a jar"

[MrPickles9000]

Description

When including the selenium-server-4.38.0.jar in our project and running from an ant task, we receive the warning "CLASSPATH element c:\project\lib\selenium-server-4.38.0.jar is not a JAR."

Also, I cannot open this JAR if I rename the extension to .zip and try to open it with Windows' built-in ZIP tool, or 7-zip. But I CAN open it if I rename the extension to .rar and open it with 7-zip. The same thing happens with the 4.39 nightly snapshot.

Despite this behaviour, the project still runs.

(I noticed a few older bugs with what looks like the same complaint, but as they were closed for inactivity, I am submitting mine. For example: see issue #12285.)

Reproducible Code

Download the indicated .jar file and open it with 7-zip.

Debugging Logs

CLASSPATH element c:\project\lib\selenium-server-4.38.0.jar is not a JAR.

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ℹ️ Last known working version: 2.41.0

[selenium-ci]

@MrPickles9000, thank you for creating this issue. We will troubleshoot it as soon as we can.

Selenium Triage Team: remember to follow the Triage Guide

[cgoldberg]

I can't open it with 7-zip with either, but it's definitely a valid jar.

Most importantly, can you run it with Java?
java -jar selenium-server-4.38.0.jar standalone

If not, verify the checksum is correct.

[joerg1985]

@MrPickles9000 this is intentional done with ed3149c i guss to make the jar executable in linux / macos.

When the preamble is removed from the file you can open it as zip.

Is there a good reason for opening it as zip? E.g. a license scanner could fail as this jar.
I am not sure what the jar standard does tell about a preamble in the file.