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I'm interested in changing the standard JavaDoc Doclet to generate some additional documentation before the normal output of tags. Looking at the code (using a decompiler) I can see that my only real option is to download the source for HtmlDoclet and friends and make a few modifications ... but the only source that's available is for the 1.3 version of the code, which doesn't understand recent updates such as annotations and so forth.
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Doclets are programs written in the Java programming language that use the doclet API to specify the content and format of the output of the Javadoc tool. By default, the Javadoc tool uses the "standard" doclet provided by Oracle to generate API documentation in HTML form.
Fortunately, all modern versions of the JDK provide the Javadoc tool – for generating API documentation from comments present in the source code. Prerequisites: JDK 1.4 (JDK 7+ is recommended for the latest version of the Maven Javadoc plugin)
From the main menu, select Tools | Generate JavaDoc. In the dialog that opens, select a scope — a set of files or directories for which you want to generate the reference, and set the output directory where the generated documentation will be placed.
Here you will find a hint to The Source for the Standard Doclet and a note that The source files are located in the directory src/share/classes/com/sun/tools/doclets. In fact, the subdirectory to consider might be langtools.
The linked JDK Source Code Release is a bit outdated. A actual JDK source code download can be done from here. If you download and install the jdk-6u23-fcs-src-b05-jrl-12_nov_2010.jar file you will find what you are looking for at the location explained above.
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