A DESCRIPTION OF THE PROBLEM :
Duplicate of https://bugs.java.com/bugdatabase/view_bug?bug_id=8294410
with source code to reproduce.


---------- BEGIN SOURCE ----------
public class Main {

    public static void main(String[] args) throws java.io.IOException {
     System.out.println("First separator's length = " + System.getProperty("line.separator").length() + ".");
     System.out.print("First multiline string will be small. It's length = ");
     System.out.println(getString().length() + ".");
     System.out.println();
    
     System.setProperty("line.separator", "e".repeat(100));
     System.out.println("Second separator's length = " + System.getProperty("line.separator").length() + ".");
     System.out.print("Second multiline string should be huge. It's length = ");
     System.out.println(getString().length() + ".");
    }
    
    public static String getString() throws java.io.IOException {
     try (java.io.PipedOutputStream pipeOut = new java.io.PipedOutputStream();
     java.io.PipedInputStream pipeIn = new java.io.PipedInputStream();
     java.io.PrintStream outputStream = new java.io.PrintStream(pipeOut);
     ) {
     pipeOut.connect(pipeIn);
     outputStream.println("q");
     outputStream.println("w");
     outputStream.close();

     return new String(pipeIn.readAllBytes());
     }
    }
}
---------- END SOURCE ----------

FREQUENCY : always