JIRA Documentation

JIRA 6.4.x
JIRA 6.0 Documentation
JIRA 5.2 Documentation
JIRA 5.1 Documentation


Search the Knowledge Base and Documentation Spaces

You're visiting the JIRA Knowledge Base. Visit the JIRA Knowledge Base Home for an overview.

Skip to end of metadata
Go to start of metadata


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

The following appears in the atlassian-jira.log:


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.


  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.

Related Content

 Expand to see related content
Help us improve!
Is this article helpful?
Is the content complete?
Is it well written?