There are several uses of the obsolete "openjdk.java.net" URL in the java man page:

./src/java.base/share/man/java.1:[http://openjdk.java.net/jeps/330] for complete details.
./src/java.base/share/man/java.1:[https://openjdk.java.net/jeps/261#Relaxed\-strong\-encapsulation].
./src/java.base/share/man/java.1:[https://openjdk.java.net/jeps/396] and made obsolete in JDK 17 by
./src/java.base/share/man/java.1:\f[B]JEP 403\f[R] [https://openjdk.java.net/jeps/403].
./src/java.base/share/man/java.1:[https://bugs.openjdk.java.net/secure/attachment/75649/JVM_CodeHeap_StateAnalytics_V2.pdf]