Why servlet JSP(Java) is so outdated?

Question

But it's nice(I don't know frameworks)

Answer 1

JSP was introduced in 1999, so it's 23 years old technology. But it is still used today, mainly in business applications built with Java EE = Enterprise Edition, which is now known as Jakarta EE, after Oracle has open-sourced it.
Spring framework was created partly to counter the dominance of Java EE and to solve its problems in open source way. But Spring also has serious downsides (runtime reflection) which makes the apps slow to startup.
These days there are also other modern frameworks and technologies which build upon Java EE, such as Micronaut, Helidon, KumuluzEE or Payara.
If you are interested in this tech stack, I highly recommend the Airhacks podcast by Adam Bien. https://airhacks.fm/