ClassFormatError Truncated class file

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Platform Notice: Data Center - This article applies to Atlassian products on the Data Center platform.

Note that this knowledge base article was created for the Data Center version of the product. Data Center knowledge base articles for non-Data Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.

*Except Fisheye and Crucible

Symptoms

The following appears in the atlassian-jira.log:

java.lang.ClassFormatError: Truncated class file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$000(URLClassLoader.java:56)

Cause

The 'Work' directory is corrupted

Workaround

  1. Shutdown JIRA
  2. Delete JIRA_INSTALL/work directory
  3. Restart JIRA to generate the work directory again



Last modified on Jan 15, 2025

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