Web 2.0 predates SPAs and has basically nothing to do with that. Web 2.0 is basically websites with user generated content. See https://en.m.wikipedia.org/wik

Web 2.0 predates SPAs and has basically nothing to do with that. Web 2.0 is basically websites with user generated content. See https://en.m.wikipedia.org/wiki/Web_2.0 https://en.m.wikipedia.org/wiki/Web_2.0 and most other sources you find when googling "what is web 2.0" And by the way, a significant number of java backends don't use log4j2 as a logging backend (the vulnerable part).