method resolution not working

Caught: java.lang.ClassCastException: java.lang.Long cannot be cast to java.math.BigDecimal
at Whole.<init>(testScript.groovy:37)
at testScript.run(testScript.groovy:41)
at testScript.main(testScript.groovy)
Java Result: 1

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import java.math.BigInteger
import java.math.BigDecimal

class Rational {
final BigInteger numerator
final BigInteger denominator

Rational(BigInteger numerator, BigInteger denominator) {
def gcd = numerator.gcd(denominator)
if (gcd > 0G)

{ numerator = numerator.divide(gcd) denominator = denominator.divide(gcd) }

this.numerator = numerator
this.denominator = denominator
}

Rational(BigDecimal number)

{ this(number.unscaledValue(), BigInteger.TEN.pow(number.scale())) }

Rational(double number)

{ this(BigDecimal.valueOf(number)) }

Rational(BigInteger number)

{ this(number, 1G) }

}

class Whole extends Rational {
Whole(BigInteger number)

{ super(number) }

Whole(long number) { super(number) }

}

x = new Whole(100)