Android update 17 seems incompatible with external Jars

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crash at run time with exceptions that look like this:
Could not find class 'javax.mail.internet.InternetAddress', referenced from method com.my.project.Main.isValidEmailAddress

If you have problems with external jars, then:

  1. create a folder named libs.
  2. Copy and paste all needed external jar files into that folder.

It will automatically be included, as explained on this page: Dealing with dependencies in Android projects

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