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Asked: 2026-05-11T10:35:26+00:00

In my Android app, I always get VerifyErrors! And I cannot figure out why.

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In my Android app, I always get VerifyErrors! And I cannot figure out why. Whenever I include a external JAR, I always get VerifyErrors when I try to launch my app (except for once, when I included Apache Log4j.)

I usually get around this by taking the source of the library and adding it to my project, but I am trying to put the GData client library.

I can get this in source, but it’s dependencies (mail.jar, activation.jar, servlet-api.jar) I cannot, so I get verify errors. I would like to get to the root of this problem once and for all. I looked on the internet, but they all seem to talk about incomplete class files? which I do not know of.

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1 Answer

  1. Android uses a different class file format. Are you running the 3rd party JAR files through the ‘dx’ tool that ships with the Android SDK?

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