JIRA is Unable to Start due to Could not reserve enough space for object heap

Still need help?

The Atlassian Community is here for you.

Ask the community


JIRA is unable to startup on a Windows machine.

The following appears in the Tomcat log, for example jira-stdout.2015-04-29.log:

2015-04-29 00:28:22 Commons Daemon procrun stdout initialized
Error occurred during initialization of VM
Could not reserve enough space for object heap



  • JIRA is running on a Windows 32-bit operating system.

Diagnostic Steps


The Java Virtual Machine (JVM) is not able to obtain the amount of memory that is required from the operating system, and will fail with the above error. This is because of the operating system limitations on 32-bit architecture and the way JVM needs contiguous memory blocks to run. Windows DLLs fragment the address space, so the limitation of memory is around 1400mb for a single Java process. This is explained in further detail in Java maximum memory on Windows XP.


Reduce the amount of maximum memory (Xms) that is provided to JIRA until the JVM can start.


Migrate onto a 64-bit operating system and use the 64-bit standalone of JIRA from our JIRA downloads section.

Last modified on Mar 30, 2016

Was this helpful?

Provide feedback about this article
Powered by Confluence and Scroll Viewport.