Java HotSpot Virtual Machine

Here is a small piece of my interface file mpe.i:

%module MpeExceptionI
%include java\std_except.i
%{
#include "MpeApi.h"
%}

namespace MpeApi
{
 class MpeException : public runtime_error
 {
   public:
   MpeException (const string& what, Result result = MMA_FAILURE);
   Result GetResult ();

   private:
     Result    m_result;
 };

}

When I run SWIG as follows:

swig -c++ -java mpe.i

I get an error message:

mpe.i(10): Warning(401): Nothing known about base class 'runtime_error'.  Ignored.

From what I can tell, std_except.i includes <stdexcept>, and this is where runtime_error is defined.
What am I doing wrong?

Thanks!