This website contains links to software which is either no longer maintained or will be supported only until the end of 2019 (CKFinder 2). For the latest documentation about current CKSource projects, including software like CKEditor 4/CKEditor 5, CKFinder 3, Cloud Services, Letters, Accessibility Checker, please visit the new documentation website.
If you look for an information about very old versions of CKEditor, FCKeditor and CKFinder check also the CKEditor forum, which was closed in 2015. If not, please head to StackOverflow for support.
If you want to use CKEditor on your Java page, check the official CKEditor for Java release. You can download it from the CKEditor download site and the documentation along with installation instructions is available at http://docs.cksource.com/CKEditor_3.x/Developers_Guide/Java/Integration.
After you download the installation package, do not forget to check the samples that are located in the _samples folder and can be run as a standalone application without much work on your side.