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Asked: 2026-05-31T23:35:41+00:00

I made a key file like this: C:\Users\Alex>keytool -genkey -v -keystore alexkey.keystore -alias alexkey

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I made a key file like this:

C:\Users\Alex>keytool -genkey -v -keystore alexkey.keystore -alias alexkey -keyalg RSA -keysize 2048 -validity 10000

and then I tried to sign my .apk file with it like this:

C:\>jarsigner -verbose -keystore alexkey.keystore problemio.apk alexkey

and I saved the .apk file by right-clicking the project name in Eclipse –> Android tools –> Export unsigned application package.

and then I put the .apk file in the same dir as the key, and ran the jarsigner command from that same dir.

Any idea why I got this error:

jarsigner: unable to create: problemio.apk.sig

Thanks!

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1 Answer

  1. Editorial Team

    Credit to @yorkw for the answer, the real solution to this problem is a folder permissions issue. Make sure you are operating in a folder that you can modify. I just fixed that same problem for my self by making sure I was in a folder with the right permissions.

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