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 :
Darwin 16.7.0 Darwin Kernel Version 16.7.0: Thu Jun 15 17:36:27 PDT 2017; root:xnu-3789.70.16~2/RELEASE_X86_64

A DESCRIPTION OF THE PROBLEM :
Calling toString() on java.sql.Date and java.time.LocalDate that contain 5-digit years result in invalid output. java.time.LocalDate prepends the year with a '+', and java.sql.Date replaces the first character of the year with a NUL character.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Execute the following commands:

$ cat <<EOF > FiveDigitYear.java
import java.sql.Date;
import java.time.LocalDate;

class FiveDigitYear {
  public static void main(String[] args) {
    LocalDate fiveDigit = LocalDate.of(10000, 1, 1);
    System.out.println("java.time.LocalDate: " + fiveDigit.toString());
    System.out.println("java.sql.Date: " + Date.valueOf(fiveDigit).toString());
  }
}
EOF

$ javac FiveDigitYear.java
$ java FiveDigitYear

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
$ java FiveDigitYear
java.time.LocalDate: 10000-01-01
java.sql.Date: 10000-01-01
$ java FiveDigitYear | hexdump -C
00000000 6a 61 76 61 2e 74 69 6d 65 2e 4c 6f 63 61 6c 44 |java.time.LocalD|
00000010 61 74 65 3a 20 31 30 30 30 30 2d 30 31 2d 30 31 |ate: 10000-01-01|
00000020 0a 6a 61 76 61 2e 73 71 6c 2e 44 61 74 65 3a 20 |.java.sql.Date: |
00000030 31 30 30 30 30 2d 30 31 2d 30 31 0a |10000-01-01.|
0000003c
ACTUAL -
$ java FiveDigitYear
java.time.LocalDate: +10000-01-01
java.sql.Date: 000-01-01
$ java FiveDigitYear | hexdump -C
00000000 6a 61 76 61 2e 74 69 6d 65 2e 4c 6f 63 61 6c 44 |java.time.LocalD|
00000010 61 74 65 3a 20 2b 31 30 30 30 30 2d 30 31 2d 30 |ate: +10000-01-0|
00000020 31 0a 6a 61 76 61 2e 73 71 6c 2e 44 61 74 65 3a |1.java.sql.Date:|
00000030 20 00 30 30 30 2d 30 31 2d 30 31 0a | .000-01-01.|
0000003c

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.sql.Date;
import java.time.LocalDate;

class FiveDigitYear {
  public static void main(String[] args) {
    LocalDate fiveDigit = LocalDate.of(10000, 1, 1);
    System.out.println("java.time.LocalDate: " + fiveDigit.toString());
    System.out.println("java.sql.Date: " + Date.valueOf(fiveDigit).toString());
  }
}
---------- END SOURCE ----------