question: public static void copyJarFile ( String srcDir , String destDir , String filename ) throws Exception { String src = srcDir + FILE_SEP + filename ; String dest = destDir + FILE_SEP + filename ; JarInputStream jarIn = null ; JarOutputStream jarOut = null ; try { jarIn = new JarInputStream ( new FileInputStream ( src ) ) ; jarOut = new JarOutputStream ( new FileOutputStream ( dest ) ) ; byte [ ] buffer = new byte [ 4096 ] ; JarEntry entry ; while ( ( entry = jarIn . getNextJarEntry ( ) ) != null ) { jarOut . putNextEntry ( entry ) ; int bytesRead ; while ( ( bytesRead = jarIn . read ( buffer ) ) != - 1 ) { jarOut . write ( buffer , 0 , bytesRead ) ; } } } catch ( Exception e ) { Debug . log ( "FileUtils.copyJarFile(): Error occurred while copying " + "jar file: " + src + " to: " + dest , e ) ; throw e ; } finally { if ( jarIn != null ) { try { jarIn . close ( ) ; } catch ( IOException e ) { Debug . log ( "FileUtils.copyJarFile(): Error occurred while " + "closing input stream for: " + src ) ; } } if ( jarOut != null ) { try { jarOut . flush ( ) ; jarOut . close ( ) ; } catch ( IOException e ) { Debug . log ( "FileUtils.copyJarFile(): Error occurred while " + "closing output stream for: " + dest ) ; } } } }
target:  Method copyJarFile to destination directory