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?
# stop tomcat8
systemctl stop tomcat8

# remove guacamole files/ directoryrm /var/lib/tomcat8/webapps/guacamole.war
rm -r /var/lib/tomcat8/webapps/guacamole/

# download the pre-built guacamole-client
wget -O guacamole.war

# deploy and create symlink under tomcat8
cp /guacamole/target/guacamole.war /etc/guacamole/
ln -s /etc/guacamole/guacamole.war /var/lib/tomcat8/webapps/

# start tomcat8
systemctl start tomcat8

Subject: Extension "guacamole-auth-jdbc-mysql-0.9.9.jar" could not be loaded
Date: Wed, 12 Oct 2016 09:02:40 +0100

I have installed guacamole using latest code (git clone) as outlined here:

I have since tried to get MySQL configuration working using the steps below:

# Download guacamole-auth-jdbc-0.9.9.tar.gz and copy to 
tar -zxvf guacamole-auth-jdbc-0.9.9.tar.gz
cd ~/guacamole-auth-jdbc-0.9.9/mysql
cp *.jar /etc/guacamole/extensions/

# Download mysql-connector-java-5.1.40-bin.jar and copy to /etc/guacamole/lib/
tar -zxvf mysql-connector-java-5.1.40.tar.gz
cd mysql-connector-java-5.1.40
cp mysql-connector-java-5.1.40-bin.jar /etc/guacamole/lib/

# Configure MySQL via supplied scripts
mysql -u root -p<password>
    CREATE DATABASE guacamole;
    CREATE USER 'guacamole'@'localhost' IDENTIFIED BY '<password>';
    GRANT SELECT,INSERT,UPDATE,DELETE ON guacamole.* TO 'guacamole'@'localhost';

cd ~/guacamole-auth-jdbc-0.9.9/mysql
cat schema/*.sql | mysql -u root -p guacamole

(I confirmed the guacadmin user was created)

# as below:
mysql-hostname: localhost
mysql-port: 3306
mysql-database: guacamole
mysql-username: guacamole
mysql-password: <password>
 I am however, unable to get the extension to load, and thus authentication 
fails. The error in catalina.out as below:

ERROR o.a.g.extension.ExtensionModule - Extension 
"guacamole-auth-jdbc-mysql-0.9.9.jar" could not be loaded: Authentication 
provider class cannot be loaded (wrong version of API?)

No errors anywhere else that I can see, including when running guacd as below - 
not sure what I am missing, or what the caus eof this error would be?
/usr/local/sbin/guacd -f -L debug


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