How-to articles, tricks, and solutions about NULLPOINTEREXCEPTION

A NullPointerException is a runtime exception that is thrown when an application attempts to use an object reference that has a null value. To avoid this exception, you need to make sure that the object reference is not null before you use it.

The java.lang.NullPointerException error is thrown when an application attempts to use an object reference that has the null value. This usually occurs when you try to call a method or access a field of an object that is null

There are several reasons why an @Autowired field in a Spring bean might be null: