Runtime.getRuntime();

Hi. i'm running under solaris 10 ... and i have this problem:

running an external aplication from command line in s.o works fine and
no cpu consume.
running from java with runtime.exec the same sh it eats my 85% of cpu

Runtime rt = Runtime.getRuntime();
        try {
                Process proc = rt.exec("/opt/ANTHaxfov42/bin/XSLCmd -
i /opt/
ANTHaxfov42/etc/XfoSettings.xml -d "+ full_xml_file + " -s " +
full_xsl_file +  " -o " + full_pdf_file + " -silent");
        } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
        }

any ideas ?

tks !!!!!