src/share/classes/java/math/BigInteger.java

*** 290,311 ****
          int cursor = 0, numDigits;
          int len = val.length();
  
          if (radix < Character.MIN_RADIX || radix > Character.MAX_RADIX)
              throw new NumberFormatException("Radix out of range");
!         if (val.length() == 0)
              throw new NumberFormatException("Zero length BigInteger");
  
          // Check for at most one leading sign
          int sign = 1;
          int index1 = val.lastIndexOf('-');
          int index2 = val.lastIndexOf('+');
          if ((index1 + index2) <= -1) {
              // No leading sign character or at most one leading sign character
              if (index1 == 0 || index2 == 0) {
                  cursor = 1;
!                 if (val.length() == 1)
                      throw new NumberFormatException("Zero length BigInteger");
              }
              if (index1 == 0)
                  sign = -1;
          } else
--- 290,311 ----
          int cursor = 0, numDigits;
          int len = val.length();
  
          if (radix < Character.MIN_RADIX || radix > Character.MAX_RADIX)
              throw new NumberFormatException("Radix out of range");
!         if (len == 0)
              throw new NumberFormatException("Zero length BigInteger");
  
          // Check for at most one leading sign
          int sign = 1;
          int index1 = val.lastIndexOf('-');
          int index2 = val.lastIndexOf('+');
          if ((index1 + index2) <= -1) {
              // No leading sign character or at most one leading sign character
              if (index1 == 0 || index2 == 0) {
                  cursor = 1;
!                 if (len == 1)
                      throw new NumberFormatException("Zero length BigInteger");
              }
              if (index1 == 0)
                  sign = -1;
          } else
*** 340,350 ****
              throw new NumberFormatException("Illegal digit");
  
          // Process remaining digit groups
          int superRadix = intRadix[radix];
          int groupVal = 0;
!         while (cursor < val.length()) {
              group = val.substring(cursor, cursor += digitsPerInt[radix]);
              groupVal = Integer.parseInt(group, radix);
              if (groupVal < 0)
                  throw new NumberFormatException("Illegal digit");
              destructiveMulAdd(magnitude, superRadix, groupVal);
--- 340,350 ----
              throw new NumberFormatException("Illegal digit");
  
          // Process remaining digit groups
          int superRadix = intRadix[radix];
          int groupVal = 0;
!         while (cursor < len) {
              group = val.substring(cursor, cursor += digitsPerInt[radix]);
              groupVal = Integer.parseInt(group, radix);
              if (groupVal < 0)
                  throw new NumberFormatException("Illegal digit");
              destructiveMulAdd(magnitude, superRadix, groupVal);