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# The major.minor version '51.0' is too recent
- URL: https://helpmonks.com/blog/java-error-major-minor-version-51-0-recent-tool-understand/
- Published: 2013-09-25T00:00:00.000Z
- Updated: 2026-04-04T01:57:33.000Z
- Description: Run into this Java error today: > The major.minor version ‘51.0' is too recent for this tool to understand While this message is rather useless, I figured th
- Author: Nitai
- Tags: email marketing

Run into this Java error today:

> The major.minor version ‘51.0’ is too recent for this tool to understand

While this message is rather useless, I figured that it had to do something with our recent switch from Java 6 to Java 7 (OpenJDK 6 to OpenJDK 7, that is). Sure enough, I found an old version of the “tools.jar” in one of our web application. Replaced it with the new one from Java 7 and all is back to normal again.

Hope this helps.