If JAVA_HOME is in the environ, return $JAVA_HOME/bin/s. Otherwise,
        return s.

def _locate_java(self, s):
        '''If JAVA_HOME is in the environ, return $JAVA_HOME/bin/s. Otherwise,
        return s.
        '''
        if 'JAVA_HOME' in self.buildozer.environ:
            return join(self.buildozer.environ['JAVA_HOME'], 'bin', s)
        else:
            return s