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Editorial Team
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Asked: 2026-05-31T21:43:23+00:00

I have come across a strange error. I have an Android project that uses

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I have come across a strange error. I have an Android project that uses external libraries, in particular:

  • android-support-v4.jar (for Fragment support in Android 1.6)
  • GoogleAdMobAdsSdk-4.3.1.jar (for ads)

The project ran fine until I updated some aspects of the plugin (can’t recall the specifics as I did not pay too much attention to it) and after that, whenever I try to use any class from the above .jar files (or any of its subclasses, even ones defined by me), I would get a java.lang.NoClassDefFoundError. I could not find the answer after much searching, so I am really stumped.

I believe this problem is related to how my IDE is set up and it has little to do with actual code, so I will not post any unless if it’s absolutely necessary.

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1 Answer

  1. Editorial Team

    You need to read this – Dealing with dependencies in Android projects.

    This link is also useful – ClassDefNotFoundError with ADT 17

    Basically, create a folder called libs and place all of your jar files inside. The recent update will automatically take care of the rest for you. You don’t need to edit your path anymore.

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