The title of your question indicates that there is no author mentioned, but in the body of the question, you imply that the author is a corporate body, i.e. the Apache Struts Team. This certainly counts as an author.
In their blog about style, the APA say that you should cite information found on the web in the same format as you cite information found in a physical print form for the same kind of content. They provide a template that uses author, date, title, and source:
Author, A. (date). Title of document [Format description]. Retrieved from https://URL
In text: (Author, year)
They also provide alternate templates for citations when you are missing one of the four pieces of information.
Regarding a website with no author mentioned, the APA say in their FAQs:
How do you reference a web page that lists no author?
When there is no author for a web page, the title moves to the first position of the reference entry:
All 33 Chile miners freed in flawless rescue. (2010, October 13). Retrieved from http://www.msnbc.msn.com/id/39625809/ns/world_news-americas/
Cite in text the first few words of the reference list entry (usually the title) and the year. Use double quotation marks around the title or abbreviated title.: ("All 33 Chile Miners," 2010).