Fatal exception: main java.lang.noclassdeffounderror: external library.jar.class android studio

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Java

Android

Eclipse

I am developing an android app which process speech and I have speech basic project (dependency for android project) ready on JAVA so I compiled JAVA project in eclipse in JAVA 7 compiler and exported that java project as a runnable jar. I put this jar into my android studio project's libs folder and by right clicking selected AS A library, I got build successful message. But when I try run the android project it gives me error saying,

FATAL EXCEPTION: main Process: in.automator.automator, PID: 4242
java.lang.NoClassDefFoundError: jar_filename.Storage.class_in_jar_file

but the said class is there in the jar file, the only doubtful thing is the mentioned class file looks something like this

import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioFormat.Encoding;
import marf.util.InvalidSampleFormatException;

public class MARFAudioFileFormat extends AudioFileFormat {
....

 ...

....

}

It refers javax.sound.sampled, so possibly that might causing the problem.

I am using JRE 7 in android studio and exporting java project in Compiler & itself.

How to resolve this error? Thanks in advance.

What I have tried:

I tried searching on the google for the problem but didn't got the solution which can resolve the issue. I tried everything.