How do I skip over null items in an object without writing multiple if statements or try blocks?

I am working with some code where the user sends in an object which can have upwards of 100 values to it. (Let's use a car for example).

updateDatabasePrep(carObject);

The car object COULD have things like name, milage, vin, color, etc... but say I only set the color and then pass the object.

In my method:

public void updateDatabasePrep(Car carObject){
    NewObject myObject;
    String x1 = carObject.getMilage();
    String x2 = carObject.getColor();
    String x3 = carObject.getName();
    //These will hold null values no problem

    //Once the rest of the data has been collected:

    //These, however, will error out when I try to set the null values.
    myObject.setMilage(x1);
    myObject.setColor(x2);
    myObject.setName(x3);
}

It uses accessor methods which will pull the data from the passed object and then tries to set said values. In the above situation, it will throw a null pointer error as the milage and name are null; only the color is not.

My goal is to update the database with ONLY the values that have been set. In this case, I COULD write a ton of if/ else or try/ catch statements for every single one, that would work, but I would prefer not to.

Is there a shorter way to do this in Java? Is there a method where you can ONLY set data if it is not-null other than if/ else, try/catch, and going through every single setter method and telling it to skip null values?