Tomcat is not able to start after changes have been made to <APPIAN_HOME>/conf/tomcat-resources.xml. The following error can be seen in the application server log:
WARNING [Tomcat JDBC Pool Cleaner[xxxxxxxxxx:xxxxxxxx]] org.apache.tomcat.jdbc.pool.ConnectionPool.abandon Connection has been abandoned PooledConnection[com.xxx.xxx.xxx.xxx]:java.lang.Exception
This issue occurs when <APPIAN_HOME>/conf/tomcat-resources.xml has the below properties set:
Set removeAbandoned="false" or remove the properties listed in the cause from tomcat-resources.xml.
The Configuring Relational Databases documentation contains recommendations on which properties should be set in tomcat-resources.xml.
This article applies to Appian 18.3 and later.
Last Reviewed: December 2019
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