Javac Snafu

WTF_JAVAC.java

import java.util.HashMap;
import java.util.Map;
import java.util.stream.Collectors;

public class WTF_JAVAC {
    private static final Map<String, String> MAP =  new HashMap<>();
    private static final String HELP = "\n"+ MAP.entrySet().stream()
            .sorted()
            .map(e -> {
                String s = e.getKey() + "\t:\t" + e.getValue();
                return s;
            })
            .collect(Collectors.joining("\n"));
}

// what is going on javac?
//Information:15/08/19 18:59 - Compilation completed with 1 error and 0 warnings in 4 s 30 ms
//Error:java: java.lang.StackOverflowError
//