Running the jar command from a Java file

[bhanu chowdary]

Hi,

I want to update a jar file progrmatically from a java file.
To test the jar command I have executed

jar uf somejar.jar abc/filename.xml

and this is updating the jar file as expected.
But when I try to run this from a java file using

Runtime.getRuntime().exec("cmd.exe /c start cd\\ jar uf  somejar.jar abc/filename.xml");

the command prompt is opening but it is displaying this message "The filename, directory name, or volume label syntax is incorrect."
Any help regarding this is greatly appreciated.