I get an exception using java on android (java.lang.NoClassDefFoundError), why?

This is the line I run:

AudioInputStream clip1 = AudioSystem.getAudioInputStream(new File(wavFile1));

This is the exception I get (From LogCat):

ERROR/AndroidRuntime(311): java.lang.NoClassDefFoundError: javax.sound.sampled.AudioSystem

This is a开发者_StackOverflow社区n old program that I wrote a year ago and then it worked perfectly. Why do I get this exception and how can I fix this?

AudioSystem is part of JavaSound, and JavaSound is part of the desktop JVM/SDK. JavaSound is NOT present in the Android JVM/SDK, so your old code will not compile on any current Android SDK.

See http://developer.android.com/guide/topics/media/index.html for the Android audio functionality outline: you will need to port your old code to use the Android SDK classes.

The problem is that the classpath isn't set correctly. See this question for some solutions.

It clearly means class AudioSystem is not present in your project. May be you were referencing some libraries which may be missing now.