Review

class ArrayUtils {
    /**
     * Returns a copy of the given array of size 1 greater than the argument. 
     * The last value of the array is left to the default value.
     * 
     * @param array The array to copy, must not be <code>null</code>.
     * @param newArrayComponentType If <code>array</code> is <code>null</code>, create a 
     * size 1 array of this type.
     * @return A new copy of the array of size 1 greater than the input.
     */    
    private static Object copyArrayGrow1(Object array, Class newArrayComponentType) {
        if (array != null) {
            int arrayLength = Array.getLength(array);
            Object newArray = Array.newInstance(array.getClass().getComponentType(), arrayLength + 1);
            System.arraycopy(array, 0, newArray, 0, arrayLength);
            return newArray;
        }
        return Array.newInstance(newArrayComponentType, 1);
    }

}