KB-1850 Null component error when using XA database

Symptoms

When using Tomcat as the application server and a database and/or driver configured for XA transactions, the following error is seen in the application server log:

SEVERE [localhost-startStop-1] org.apache.tomcat.util.modeler.Registry.registerComponent Null component Catalina:type=DataSource,host=localhost,context=/suite,class=javax.sql.XADataSource,name="jdbc/AppianPrimaryDS"

Cause

This issue has been addressed via AN-123225 in the following versions/hotfixes:

• Appian 18.4 Hotfix Package C
• Appian 18.3 Hotfix Package F

Action

Apply the latest hotfix to your Appian installation or upgrade to the latest version of Appian.

Workaround

Use factory="org.apache.tomcat.jdbc.pool.DataSourceFactory" when you specify the XADatasouce in tomcatResources.xml as shown in the Configuring Relational Databases documentation.

Note: This requires the password to be placed in the file in cleartext.

Affected Versions

This article applies to Appian 18.3 and 18.4.

Last reviewed: January 2019