We noticed that javac --release N misses some APIs that were added in relevant Maintenance Releases. For example, this causes false errors when compiling targeting older releases, see for example accessing jdk.net.ExtendedSocketOptions.TCP_KEEPINTERVAL that was added by JDK 8 Maintenance Release 3.

% cat YoloMR.java
public class YoloMR {
public static void main(String... args) {
jdk.net.ExtendedSocketOptions.TCP_KEEPINTERVAL.hashCode();
}
}

% /Library/Java/JavaVirtualMachines/amazon-corretto-8.jdk/Contents/Home/bin/javac YoloMR.java
[all fine]

% /Library/Java/JavaVirtualMachines/amazon-corretto-11.jdk/Contents/Home/bin/javac --release 8 YoloMR.java
YoloMR.java:3: error: package jdk.net.ExtendedSocketOptions does not exist
jdk.net.ExtendedSocketOptions.TCP_KEEPINTERVAL.hashCode();
^

% /Library/Java/JavaVirtualMachines/amazon-corretto-17.jdk/Contents/Home/bin/javac --release 8 YoloMR.java
YoloMR.java:3: error: package jdk.net.ExtendedSocketOptions does not exist
jdk.net.ExtendedSocketOptions.TCP_KEEPINTERVAL.hashCode();

 /Library/Java/JavaVirtualMachines/amazon-corretto-21.jdk/Contents/Home/bin/javac --release 8 YoloMR.java
warning: [options] source value 8 is obsolete and will be removed in a future release
warning: [options] target value 8 is obsolete and will be removed in a future release
warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
YoloMR.java:3: error: package jdk.net.ExtendedSocketOptions does not exist
jdk.net.ExtendedSocketOptions.TCP_KEEPINTERVAL.hashCode();
^
1 error


% /Library/Java/JavaVirtualMachines/amazon-corretto-24.jdk/Contents/Home/bin/javac --release 8 YoloMR.java
warning: [options] source value 8 is obsolete and will be removed in a future release
warning: [options] target value 8 is obsolete and will be removed in a future release
warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
YoloMR.java:3: error: package jdk.net.ExtendedSocketOptions does not exist
jdk.net.ExtendedSocketOptions.TCP_KEEPINTERVAL.hashCode();
^
1 error
3 warnings