Why does java.lang.NoClassDefFoundError pop up after migrating to java 11?

Question

Java

Hi, I'm trying to migrate from java 8 to java 11. I downloaded jdk 11 from adobopenjdk, selected it in the project settings, when I run it, I see that it is used, but the error "java.lang.NoClassDefFoundError: baseClass/BaseClass$AjcClosure1" is displayed. If you switch back to version 8, then everything works. Why does this error occur?