Explanation

When running multiple XWiki instances in the same servlet container (e.g., Tomcat or Jetty), you may encounter the following error if multiple instances try to use the same cache domain:

com.xpn.xwiki.XWikiException: Error number 3 in 0: Could not initialize main XWiki context
...
Caused by:
org.infinispan.jmx.JmxDomainConflictException: Domain already registered org.xwiki.infinispan

Cause

This error occurs because the cache component (Infinispan) attempts to register the same JMX domain for multiple instances, causing a conflict.

Solution

To resolve the issue, you need to configure each XWiki instance to use a unique JMX domain:

1. Edit WEB-INF/cache/infinispan/config.xml for each XWiki instance.
2. For Infinispan version 7 and above:
   • Add the <jmx duplicate-domains="true"/> element inside the <cache-container> element to allow multiple domains.

This ensures that each XWiki instance operates with its own JMX domain, preventing the conflict.

Related

• XWiki behind a Proxy Server.
• SSL Certificate Error.
• "File Path too Long" on Windows when Unzipping.