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A servlet container implementing Servlet API 3.1 is required. For example:
Jetty 9.4 or later (but not Jetty 11)
Tomcat 9 or later (while some older versions of Tomcat are nominally suitable, they have not been tested and have been obsoleted in any case)
We also do not officially support any "packaged" containers provided by OS vendors. We do not test on these containers so we cannot assess what changes may have been made by the packaging process, and they frequently contain unwarranted and ill-considered changes from the upstream software.
The recommended container implementation is Jetty and all development and most testing time by the core project team is confined to the Jetty platform. At present, Jetty 9.4 10 is recommended.
There are no specific requirements regarding Operating Systems, but in practice this is inherently limited by the Java distributions supported, as noted above.
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