# Java: NoClassDefFoundException

**URL:** <https://community.openems.io/t/java-noclassdeffoundexception/2676>\
**Category:** English Forum\
**Created:** [May 19, 2024, 4:05am UTC](https://community.openems.io/t/java-noclassdeffoundexception/2676 "2024-05-19T04:05:20Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![stefan.feilmeier](https://community.openems.io/user_avatar/community.openems.io/stefan.feilmeier/32/2585_2.png) [@stefan.feilmeier](https://community.openems.io/u/stefan.feilmeier)\
**Post date:** [May 31, 2024, 10:49pm UTC](https://community.openems.io/t/java-noclassdeffoundexception/2676/3 "2024-05-31T22:49:20Z")

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Hi @spg1101 and welcome to the Community.

Usually these errors should only rarely happen during development. Please try to follow the steps listed here to fix them:

> [@Build in Eclipse fails with many errors](https://community.openems.io/t/build-in-eclipse-fails-with-many-errors/263/2):
>
> Hi, yes… this can happen from time to time. Most likely Eclipse did not recognize latest file changes. Here are some tips to get rid of build errors in Eclipse: Select all bundles in “Bndtools Explorer” (Ctrl + A) and press F5 to refresh them. This helps, if Eclipse did not recognize no files in existing bundles. Open File → Import in the menu and select Bndtools → Existing Bnd Workspace to reimport all bundles This helps, if there were new bundles added in the meantime. Those are not …

Regards,  
Stefan

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