FULL PRODUCT VERSION :
java version "1.8.0_144"
Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Windows 10 64 bit

A DESCRIPTION OF THE PROBLEM :
The methods Date#toInstant() and Date#from(Instant) do only work as long as Date#getTime returns a positive long.
java.time.Instant should treat the output of Date#getTime unsigned long just like java.util.Date treats it.
I don't mind the inconsistencies, that the Date constructor treats the longs as unsigned while the static method of Instant treats them as signed, the bug is that the conversion returns the false Instant/an ArithmeticException

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run Date.from(Instant.now().plusMillis(Long.MAX_VALUE));
Get an ArithmeticException although this Instant could be represented by a Date object

Print new Date(Long.MIN_VALUE) and Instant.ofEpochMilli(Long.MIN_VALUE) to the console. They do not represent the same point in time although they should

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Date.from(Instant) should return a date object as long as a Date object can represent the given Instant
ACTUAL -
Instant#getEpochMillis throws an ArithmeticException, because the resulting long cannot be returned as signed integer

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "main" java.lang.IllegalArgumentException: java.lang.ArithmeticException: long overflow
at java.util.Date.from(Date.java:1359)
at HelloWorld.main(HelloWorld.java:10)
Caused by: java.lang.ArithmeticException: long overflow
at java.lang.Math.multiplyExact(Math.java:892)
at java.time.Instant.toEpochMilli(Instant.java:1237)
at java.util.Date.from(Date.java:1357)
... 1 more

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.util.Date;
import java.time.Instant;

public class HelloWorld {
  public static void main(String[] args) {
    System.out.println(Date.from(Instant.now().plusMillis(Long.MAX_VALUE))); // ArithmeticException although this Instant can be represented by java.util.Date
  }
}
---------- END SOURCE ----------