$ javac --enable-preview --release 26 Pem26Style.java      (JDK 26)
exit=0

$ javac --enable-preview --release 27 Pem26Style.java      (JDK 27)
Pem26Style.java:1: error: cannot find symbol
import java.security.DEREncodable;
                    ^
  symbol:   class DEREncodable
  location: package java.security
Pem26Style.java:20: error: cannot find symbol
        PEMDecoder viaProvider = PEMDecoder.of().withFactory(provider);         // 2
                                                ^
  symbol:   method withFactory(Provider)
  location: class PEMDecoder
Pem26Style.java:22: error: incompatible types: byte[] cannot be converted to String
            String base64Text = pem.content();                                  // 3
                                           ^
3 errors
exit=1