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Doclet programs work with the Javadoc tool to generate documentation from code written in Java. Doclets are written in the Java programming language and . How can doclets help? With great wisdom, the Java team understood that developers don’t like to produce documentation because writing. The standard doclet is the doclet provided by SunTM that produces Javadoc’s default HTML-formatted API output. The API documentation for the JavaTM.

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Eliminate the simplistic support for analyzing documentation comments in favor of the Compiler Tree APIcom.

Replace the use of the “template class” com. Doclet with a suitable new interface type.

Although improving performance is not a goal, it is expected that the performance of the javadoc tool and the new standard doclet will be improved as a result of this work.

The API specifies that a doclet is simply a class that implements some or all of a set of static methods, as exemplified by the template class com. The use of static methods is particularly troublesome because they require the use of static members to share data between the methods.


This has negative implications for both concurrent usage and for testing. The API provides its own language-model API, which has a number of limitations for example, arrays are not modeled well and which is a burden to update as the Java language evolves in ways that affect API signatures for example, generics, type annotations, and default methods.

JEP 221: New Doclet API

The API provides minimal, inefficient and incompletely-specified support for analyzing the contents of a documentation comment. This places a significant burden on any doclet looking to process the contents of a comment. The API also provides no support for determining the position within the containing source file of constructs within the comment. This makes it effectively impossible to provide accurate position information for any diagnostics that should be reported. The support for analyzing comments is backed by a poor and inefficient implementation, in the old standard doclet, which relies heavily on using substring matching to separate the constructs within the comment.

The new Doclet API is declared in the jdk. The javadoc tool is updated to recognize doclets written against the new Doclet API.

Doclet Overview

The old Doclet APIs will be supported for transitional purposes, and will be frozen, that is, not updated to support any new language features introduced during the transition period. Taglets provide the ability for users to define custom tags that can be used in documentation comments, and to specify how such tags should appear within the doclft documentation.


The updated standard doclet supports an updated taglet API. It is known that there are some existing user-written doclets that directly reference code within the old “standard doclet”, even though that code is not and never has been a jqva interface.

Doclet Overview

Since that code is difficult to maintain and update, especially with respect to recent new language features, the old “standard doclet” has been deprecated for removal in JDK 9, and will be removed in a future release. Additional tests have jaa added to cover edge cases.

Goals Reduce the maintenance burden of outdated APIs. Non-Goals Although improving performance is not a goal, it is expected that the performance of the javadoc tool and the new standard doclet will be improved as a result of this work.