Spring boot 3.3.2 and tomcat 11.0.0-M22
org.springframework.boot.autoconfigure.web.embedded.TomcatWebServerFactoryCustomizer.lambda$customizeRejectIllegalHeader$21(TomcatWebServerFactoryCustomizer.java:227)
The following method did not exist:
'void org.apache.coyote.http11.AbstractHttp11Protocol.setRejectIllegalHeader(boolean)'
Action:
Correct the classpath of your application so that it contains compatible versions of the classes org.springframework.boot.autoconfigure.web.embedded.TomcatWebServerFactoryCustomizer and org.apache.coyote.http11.AbstractHttp11Protocol
upgraded Spring boot 3.3.2 and tomcat 11.0.0-M22
Spring Boot 3.3 does not support Tomcat 11 milestones. You should use Tomcat 10.1 with Spring Boot 3.3.