Isn't it annoying you have to specify all the jar files needed to run a javaprogram?
Nomally you would make a:
SET CLASSPATH=jar1.jar;jar2.jar;jar3.jar...
But in stead you can simply specify the directory where you have all your jar files:
javac.exe -Djava.ext.dirs=usualextdir;anotherdir...
and
java.exe -Djava.ext.dirs=usualextdir;anotherdir...
See the original page for more tips.