javadoc command displays the usage with error

Tested OS : All
Tested Build : Mustang promoted build 43

Steps to reproduce :

1. Install any mustang build 43
2. Go to jdk1.6.0/bin folder
3. Launch ./javadoc

It displays javadoc usage

jlab403:/home/mn150763 143 % ./javadoc
javadoc: error - No packages or classes specified.
usage: javadoc [options] [packagenames] [sourcefiles] [@files]
-overview <file> Read overview documentation from HTML file
-public Show only public classes and members
.
.
.
.
-stylesheetfile <path> File to change style of the generated documentation
-docencoding <name> Output encoding name
1 error
jlab403:/home/mn150763 144 %

It can be noticed that "1 error" displayed at the end of the usage

Expected Behaviour : It would be better if it prints only the usage.
Note: In jdk, none of the tools usage prints "1 error"
###@###.### 2005-07-21 07:35:42 GMT