제가 지금 사운드 관련 앱을 만들고자 하는데요.
JRE 의  javax.sound.sampled 패키지를 사용하려면 어떻게 해야 할까요?
단순히 jar로 묶어서 이클립스에서 외부참조로 추가하니까 다음과 같은 에러가 납니다.
프레임웍 차원에서 빌드를 다시해야 하는지? 
빌드하더라도 하드웨어적으로 문제가 없는지 궁금합니다.   

Attempt to include a core class (java.* or javax.*) in something other
than a core library. It is likely that you have attempted to include
in an application the core library (or a part thereof) from a desktop
virtual machine. This will most assuredly not work. At a minimum, it
jeopardizes the compatibility of your app with future versions of the
platform. It is also often of questionable legality.

If you really intend to build a core library -- which is only
appropriate as part of creating a full virtual machine distribution,
as opposed to compiling an application -- then use the
"--core-library" option to suppress this error message.

If you go ahead and use "--core-library" but are in fact building an
application, then be forewarned that your application will still fail
to build or run, at some point. Please be prepared for angry customers
who find, for example, that your application ceases to function once
they upgrade their operating system. You will be to blame for this
problem.

If you are legitimately using some code that happens to be in a core
package, then the easiest safe alternative you have is to repackage
that code. That is, move the classes in question into your own package
namespace. This means that they will never be in conflict with core
system classes. If you find that you cannot do this, then that is an
indication that the path you are on will ultimately lead to pain,
suffering, grief, and lamentation.