guacamole-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Mike Jumper <>
Subject Re: Extension "guacamole-auth-jdbc-mysql-0.9.9.jar" could not be loaded
Date Mon, 17 Oct 2016 22:42:10 GMT
On Wed, Oct 12, 2016 at 1:08 PM, Chris Bradford <>

> Nevermind - I fixed this, my solution was to stop tomcat8, remove the
> guacamole.war file, guacamole tomcat8 directory and then re-dploy the
> guacamole client, using the commands below. Perhaps an issue caused by
> building the guacamole-clientvia git clone, rather than downloading .war
> file?

Building guacamole-client from git should result in exactly the same sort
of .war file (it's how the .war is built each release, after all).

The error you were seeing (regarding API version) occurs when an extension
cannot be loaded because it was built against a different version of
Guacamole. While the version number of Guacamole within the git repository
at the time was 0.9.9, it's likely that there were changes on git which
made it incompatible with the extensions built against the 0.9.9 release.
There are version number sanity checks performed against extensions when
Guacamole starts up, but those will only fail if the version number of the
application has been bumped, and that only happens when we're preparing for
a new release.

The database authentication is part of the guacamole-client source, within
the "extensions/guacamole-auth-jdbc" directory, so if you built
guacamole-client from git you may have actually had a proper version of the
extension on hand - just deeper in the directory tree. In any case, if you
want to build Guacamole from git, you can definitely do so. Just make sure
to use extensions built against the same version (ie: from git).

Please also keep in mind that the repositories referenced in the link you
provided are from prior to the move to Apache Incubator, and thus will not
have the latest source. The new repositories are:

- Mike

View raw message