jarsigner does not always work

When I used jarsigner like so:

jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore
TestApp2.keystore -keypass 6charpassword TestApp2-debug.apk TestApp2

... sometimes I get the return from terminal:

jarsigner: unable to sign jar: java.util.zip.ZipException: invalid entry
compressed size (expected 15088 but got 15506 bytes)

This error comes because it has already been signed. Does this mean that "cordova build android" is automatically applying the .keystore file in the TestApp2/ folder, and we no longer need to do a jarsigner after the first keytool has been applied?