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a java lang nullpointerexception occurs when a java application or java applet has been badly coded typically the java program and consequently the programmer attempted to access the reference or handle to a java object that did not exist java lang nullpointerexception occurs when a java application or java applet has been badly coded typically the java program and consequently the programmer attempted to access the reference or handle to a java object that did not exist
If a search found nothing, then it found null. If you can't connect to the database to do the search in the first place, then you throw an exception. A more interesting example (for me) is the dynamic downcast found in (e.g.) Eiffel and C++.This returns NULL if an object is not of the expected subclass.In other words, the static type error-detection mechanism punts, and commutes the type error into a NULL pointer error which is caught by the runtime system. It's a point of trade-off between statically checking and dynamic checking.t the heart of the first objection, the problem is that Java does not distinguish between possibly-null values and never-null values. It allows a null value to have any reference type, so that it is never safe to dereference such values. This is something the NiceLanguage extension of Java allows.