Spring Framework 4.2.0 was released on 31 July 2015 and was immediately upgraded to version 4.2.1, which was released on 01 Sept 2015. It is "compatible with Java 6, 7 and 8, with a focus on core refinements and modern web capabilities". Spring Framework 4.3 has been released on 10 June 2016 and was supported until 2020.It was announced to "be the final generation within the general Spring 4 system requirements (Java 6+, Servlet 2.5+), [...]". Spring 5 is announced to be built upon Reactive Streams compatible Reactor Core.[obsolete source] Spring Framework 6.0 has been released on 16 November 2022 and came with a Java 17+ baseline and a move to Jakarta EE 9+ (in the jakarta namespace), with a focus on the recently released Jakarta EE 10 APIs such as Servlet 6.0 and JPA 3.1.