too much for exec("java cmd")???

[yunfong]

hi,
i haf a code which run exec("java matchUploadPic");
e Java code actually run commands for 621 images to get some output..
e final result should be images on screen yet it cant be detected..
yet if i try only 5 images or less, it can display results...
can anyone explain to me why is it so??
is it too much to handle for exec??

thanks everyone!!