Java 9/10/11 - What's new and why you should upgrade
summary
JDK 11 LTS is the supported target while JDK 9 and 10 are already unmaintained, and Oracle changes the download terms so Oracle JDK now requires a paid license for production; alternatives are OpenJDK builds (java.net), AdoptOpenJDK and Azul Zulu. Migration has concrete breakages: module/classloader semantics cause ClassCastException and getResource nulls, TLS 1.3 and removed APIs (CORBA, Java EE/SOAP) force library updates, and more than 50 removed JVM options plus broken Maven plugins can make migration take months (Jetty needed ~6 months).
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