Static site generators have gained popularity in recent years due to their simplicity and efficiency in creating websites. They eliminate the need for a database or server-side scripting, making them faster and more secure. If you’re a Java developer looking to create a static website, there are several free and open source Java static site generators available. Here are five of the best options to consider:

1. JBake:
JBake is a Java-based static site generator that allows you to create websites quickly and easily. It supports various template engines, including FreeMarker, Groovy, and Thymeleaf, making it easy to customize the look and feel of your site. JBake also offers built-in support for Markdown and AsciiDoc, making it easy to write content for your website. With JBake, you can generate your site locally and then deploy it to a web server or GitHub Pages.

2. Jekyll:
Jekyll is one of the most popular static site generators, originally written in Ruby, but now also available in Java. It is simple to use and offers a wealth of features, including support for themes, plugins, and custom layouts. Jekyll uses Markdown for content creation and Liquid for templating, making it easy to create and customize your site. With Jekyll, you can generate your site locally and then deploy it to a web server or a static web hosting service.

3. Thymeleaf Static Site Generator:
Thymeleaf Static Site Generator is a Java-based static site generator that uses Thymeleaf templates to generate static websites. It allows you to create dynamic content using Thymeleaf’s powerful template engine, making it easy to design and customize your site. Thymeleaf Static Site Generator also offers support for internationalization and customization through plugins. With Thymeleaf Static Site Generator, you can generate your site locally and then deploy it to a web server or a static web hosting service.

4. AsciidoctorJ:
AsciidoctorJ is a Java-based static site generator that uses AsciiDoc markup language for content creation. It allows you to write content in a simple and human-readable format, making it easy to create and manage your site. AsciidoctorJ offers support for custom templates and themes, as well as integration with popular static site hosting services like GitHub Pages. With AsciidoctorJ, you can generate your site locally and then deploy it to a web server or a static web hosting service.

5. Slick Static Site Generator:
Slick Static Site Generator is a lightweight Java-based static site generator that offers simplicity and speed in website creation. It supports Markdown for content creation and allows you to customize your site using Velocity templates. Slick Static Site Generator also offers support for syntax highlighting, image processing, and custom plugins. With Slick Static Site Generator, you can generate your site locally and then deploy it to a web server or a static web hosting service.

In conclusion, Java developers have several options for creating static websites using free and open source static site generators. Whether you prefer simplicity, flexibility, or advanced features, there is a Java static site generator that can meet your needs. Consider trying out one of the five options mentioned above to create your next static website.