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NullPointerException?
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A: The best way to handle a NullPointerException is to prevent one being thrown to begin with. A NullPointerException happens when a null value is assigned to an object type variable, then a method is called on that variable. The variable is expected to hold a “pointer” or reference to an object, but actually holds a null value, hence “null pointer”.
This type of exception can also happen when you try to get or set a field on a null object reference, operate on the reference as if it was an array, or throw it as if it was an exception.
A NullPointerException is a runtime exception that you should not try to catch. Avoid the exception by checking the value before a call, as in the example below with the System.getProperty(String) method. The getProperty() method is expected to return a String value for a given system property, or null if the property does not exist.
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What's the best way to handle a NullPointerException?