within netbeans i have clean and build my GUI app and i have placed the entire code for starting the app in a .bat file so that my client can double click and execute and when i click cmd also start with the app and closing the cmd also closes the app too
is there any other way so that i can make a file whatever so that i client can just double click to start the app ?
You got two options
1) Change it to javaw -jar .... (not really recommended)
2) Make sure your jar is self executable by defining the Main-Class attribute in the manifest file http://download.oracle.com/javase/tutorial/deployment/jar/appman.html This will make your jar "executable". i.e. the user can double click the jar to launch the application (no need for the batch file)