When starting Tomcat via start-appserver.sh or start-appserver.bat, the startup fails with the following message observed in the application server log:
SEVERE [localhost-startStop-1] org.apache.tomcat.jdbc.pool.ConnectionPool.init Unable to create initial connections of pool. java.sql.SQLException: Unable to load class: org.mysql.jdbc.Driver from ClassLoader:java.net.URLClassLoader@31221be2;ClassLoader:AppianWebappClassLoader context: suite delegate: false----------> Parent Classloader:java.net.URLClassLoader@31221be2
The classname for the MySQL driver has incorrectly been prefaced with org rather than com.
Correct the driverClassName found in tomcatResources.xml file located in <APPIAN_HOME>/conf and restart Tomcat. The accurate convention is: driverClassName="com.mysql.jdbc.Driver"
This article applies to Appian 18.3 and later.
Last Reviewed: April 2021
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