a certain third-party jar's classes is missing after release build

I'm building a native extension for the Android platform using several third-party jar files.

I exportd a jar file from Android project that include classes implementing the FREExtension interface.

And I merged A exported jar file and third-party jar files into a single jar file.

I package a ANE file and I build a APK file using a ANE file.

Strangely a certain jar's classes of the third-party jar files are missing in APK after release build.

( I am using Flash Builder 4.6. )

I changed a ANE file to .zip and check jar file using jd-gui tool.

This time I saw missing classes clearly.

I tried many ways but did not find a solution.

If anyone else know about this or experience this problem,

plese give me a advice.

Thanks.