Received a funky error message

Information:Using javac 1.8.0_77 to compile java sources Information:java: Errors occurred while compiling module 'Systemizer' Information:6/27/2016 2:04 PM - Compilation completed with 1 error and 3 warnings in 529ms Warning:java: source value 1.5 is obsolete and will be removed in a future release Warning:java: target value 1.5 is obsolete and will be removed in a future release Warning:java: To suppress warnings about obsolete options, use -Xlint:-options. C:\Users\pauharri\IdeaProjects\Systemizer\src\com\teamtreehouse\Main.java Error:(12, 75) java: cannot find symbol symbol: method stringPropertyNames() location: class java.util.Properties

package com.teamtreehouse;

import java.util.Set; import java.util.TreeSet;

public class Main {

public static void main(String[] args) {
    System.out.printf("This is the classpath:  %s %n",
            System.getProperty("java.class.path"));
    Set<String> propNames = new TreeSet<String>(System.getProperties().stringPropertyNames());
    for (String propertyName : propNames) {
        System.out.printf("%s is %s %n",
                propertyName,
                System.getProperty(propertyName));
    }

}

}