Learn what causes null pointer exceptions in Java, how to identify them, and how to fix them with simple techniques and best practices. Also, learn how to test and learn more about them.

Null pointer exception is an “exception” (error) that is particularly common when programming in Java. For a beginner, this is a confusing and daunting message to receive, but it can be just ...

I created a mapping with a text field, with only one document of valid values. Then I run a script query on using _source field, filtering null values. The query fails with null pointer exception and ...

Null pointer exceptions are common bugs in Java projects. Previous research has shown that dereferencing the results of method calls is the main source of these bugs, as developers do not anticipate ...

We envision a world where no exceptions are raised; instead, language semantics are changed so that operations are total functions. Either an operation executes normally or tailored recovery code is ...