I could build JCEF successfully using JDK-11 last december, but some new dependencies now appear to break the process:
.\java\tests\detailed\util\DataUri.java:7: error: package javax.xml.bind does not exist
.\org\cef\browser\CefBrowserOsr.java:7: error: package com.jogamp.nativewindow does not exist
.\org\cef\browser\CefBrowserOsr.java:9: error: package com.jogamp.opengl does not exist
.\org\cef\browser\CefBrowserOsr.java:13: error: package com.jogamp.opengl.awt does not exist
etc...
With JDK-8 the build seems to work OK.