Important clarification on the com.sun namespace
Posted on March 30, 2021
All of the com.sun namespace is JDK-specific -- it's not part of the Java SE Platform API. Around 90% of the com.sun namespace is internal to the JDK -- not intended for use outside the JDK. An example is the com.sun.security.ntlm package in the java.base module…
More at https://mail.openjdk.java.net/pipermail/jdk-dev/2021-March/005269.html