Compiler can't get usage error message in properties file.
Since a argument is missing in getText(), usage() can't show
error message and the following messages show on the command line.

java.lang.NullPointerException
     at java.text.MessageFormat.format(MessageFormat.java)
     at java.text.MessageFormat.format(MessageFormat.java)
     at java.text.MessageFormat.format(MessageFormat.java)
     at sun.tools.javac.Main.getText(Main.java)
     at sun.tools.javac.Main.usage(Main.java)
     at sun.tools.javac.Main.compile(Main.java)
     at sun.tools.javac.Main.main(Main.java)