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From Mike Jumper <>
Subject Re: Error when trying to use MySQL Authentication in CentOS 7
Date Thu, 18 May 2017 00:12:25 GMT
The *only* correct location for that .jar is GUACAMOLE_HOME/lib/, which in
your case is /guacamole/lib. You should remove that .jar from all those
other locations.

As for the error you're seeing, that is due to the .jar being present in
GUACAMOLE_HOME/extensions/. Guacamole tries to load it as an extension, but
aborts because it isn't.

- Mike

On May 17, 2017 16:42, "Sam" <> wrote:

In my log file I always receive:

May 17 16:33:38 web server: 16:33:38.198 [localhost-startStop-1] INFO
o.a.g.extension.ExtensionModule - Extension "MySQL Authentication" loaded.
May 17 16:33:38 web server: 16:33:38.198 [localhost-startStop-1] ERROR
o.a.g.extension.ExtensionModule - *Extension
"mysql-connector-java-5.1.42-bin.jar" could not be loaded*: Extension
mysql-connector-java-5.1.42-bin.jar is missing guac-manifest.json
May 17 16:33:38 web server: 16:33:38.424 [localhost-startStop-1] INFO
o.a.g.t.w.WebSocketTunnelModule - Loading JSR-356 WebSocket support...

I have copied the relevant JAR to:


(/guacamole is linked at /usr/share/tomcat/.guacamole)


I can't think of anywhere else to copy this JAR. The JAR is the exact name
and version.

Any ideas?

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