question: public void saveBootProp ( ) throws IOException { if ( ! bootProp . equals ( bootPropOrg ) ) { final String propFile = jarFolder + "jar.properties" ; final OutputStream os = new FileOutputStream ( propFile ) ; try { bootProp . store ( os , "Stendhal Boot Configuration" ) ; } finally { os . close ( ) ; } } }
target:  saves modified boot properties to disk.