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Javadoc
Austin, Texas, USA
What it is
Javadoc generates HTML API documentation from Java source files and is installed with the Java Development Kit (JDK). Its standard doclet creates pages for public and protected Java types and members, including classes, interfaces, constructors, methods, and fields. It can process packages, individual source files, or both, and include subpackages recursively. Developers can use alternate doclets to define output content and format, and taglets to support custom tags in documentation comments. The standard doclet includes DocLint, which can help detect common comment problems but does not verify conformance or correct errors. Oracle advises users to consider risks from output that is non-conformant or contains executable content such as JavaScript. Oracle lists JDK 25 downloads for Linux, macOS, and Windows. JDK 25 binaries are free under Oracle No-Fee Terms and Conditions through September 2028; subsequent updates use the Java SE OTN License, which may require a production-use fee beyond limited free grants. Customers with active support contracts can contact My Oracle Support with technical questions.
For and against
For
- Included with the Java Development Kit.
- Documents packages or individual source files.
- Supports alternate doclets and custom taglets.
- DocLint can flag common comment problems.
- JDK 25 downloads are listed for three operating systems.
Against
- DocLint does not verify conformance or correct errors.
- Executable content in output can pose risks.
- Later JDK updates may require a production-use fee.
The verdict
Javadoc generates reference pages directly from Java source comments and supports custom output through doclets and taglets. Keep in mind DocLint’s limits and Oracle’s note about potentially risky generated content.
Who it suits
Javadoc suits Java developers who need HTML documentation generated from source files. It can also fit projects that need alternate documentation output formats or custom tags.
Plans and prices
Javadoc (included with JDK 25)
Included with the JDK · JDK 25 binaries are free under Oracle No-Fee Terms and Conditions through September 2028
Read 4 Oct 2026 · oracle.com
On the record
- Custom output
- Javadoc supports alternate doclets that define the content and format of generated output.docs.oracle.com · read 4 Oct 2026
- Custom tags
- Custom tags in documentation comments are supported through taglets.docs.oracle.com · read 4 Oct 2026
- Inputs
- Javadoc can document whole packages, individual Java source files, or both, and can recursively include subpackages.docs.oracle.com · read 4 Oct 2026
- JDK inclusion
- The Javadoc tool is installed with the Java Development Kit (JDK).docs.oracle.com · read 4 Oct 2026
- License limit
- Oracle says JDK 25 updates are free under NFTC through September 2028; subsequent updates use the Java SE OTN License, which may require a fee for production use beyond its limited free grants.oracle.com · read 4 Oct 2026
- Maker founding
- Oracle says it was founded in 1977.investor.oracle.com · read 4 Oct 2026
- Operating systems
- Oracle lists JDK 25 downloads for Linux, macOS, and Windows.oracle.com · read 4 Oct 2026
- Output safety
- Oracle advises users to be aware of problems that may arise from non-conformant output or output containing executable content such as JavaScript.docs.oracle.com · read 4 Oct 2026
- Purpose
- Javadoc generates HTML API documentation pages from Java source files.docs.oracle.com · read 4 Oct 2026
- Standard output
- The standard doclet generates HTML pages describing public and protected types and members, including classes, interfaces, constructors, methods, and fields.docs.oracle.com · read 4 Oct 2026
- Support
- Oracle directs customers with active support contracts to My Oracle Support for technical questions and service requests.oracle.com · read 4 Oct 2026
- Validation
- The standard doclet provides DocLint to help detect common problems in documentation comments, but does not validate their conformance or correct errors.docs.oracle.com · read 4 Oct 2026
