Is jdk downloaded from oracle through the following link is under GPL license, as I thought it's not https://www.oracle.com/technetwork/java/javase/downloads/jdk11-downloads-5066655.html
and if it's not GPL licensed, why the openjdk site is recommending that I download jdk from oracle and claiming that it's under GPL license https://jdk.java.net/java-se-ri/11
These binaries are provided for use by implementers of the Java SE 11 Platform Specification and are for reference purposes only. This Reference Implementation has been approved through the Java Community Process. Production-ready binaries under the GPL are available from Oracle; and will be in most popular Linux distributions