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Symptoms

JIRA fails to start due to a NoClassDefFoundError for org/apache/log4j/Appender.

The following appears in the atlassian-jira.log:

Cause

This typically happens because some classes are missing from the $JIRA_INSTALL/lib/ directory, in this case the log4j class. These classes are jar files which can be checked through file system.

Resolution

  1. Verify if the JAR exists within the $JIRA_INSTALL/lib directory.
  2. If not, download the JIRA version from our downloads archive (this will either be a tarball or a ZIP, depending on the OS. Do not download the installer version).
  3. Extract it into a temporary directory and add in the missing JAR file from the downloaded archive into the $JIRA_INSTALL/lib directory.

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