JIRA unable to start after an upgrade due to java.lang.IncompatibleClassChangeError

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Symptoms

The following appears in the atlassian-jira.log:

java.lang.RuntimeException: org.apache.jasper.JasperException: javax.servlet.ServletException: java.lang.IncompatibleClassChangeError: Found interface com.atlassian.jira.plugin.navigation.TopNavigationModuleDescriptor, but class was expected

Cause

There are incompatible plugins in JIRA which is causing the application failed to start after the upgrade.

Resolution

  1. Stop JIRA
  2. Backup <jira-home-directory>/plugins/installed-plugins/
  3. Remove <jira-home-directory>/plugins/installed-plugins/
  4. Start JIRA
 This will allow JIRA to successfully startup again. Next, install only the compatible plugin into JIRA. You may check the plugins compatibility matrix and download them from here: https://marketplace.atlassian.com/.

Last modified on Mar 30, 2016

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