Finding the potential null pointer exception

Nullfree will fail your build if your project has a null.

NullPath: A static analysis tool for detecting NullPointerException (NPE) issues in Java code, built on the Tai-e framework.

a java agent that turns a java.lang.NullPointerException in what it really means.

Java repository to show how to handle nulls

A simple class to prevent NullPointerExceptions in Java

Using Optional class for avoid NullPointerException error

Reproduces a NullPointerException in OracleWallet

IntraJ is an application of the framework IntraCFG for the Java language. IEEESCAM2021

Guard container object for dealing with optional/null values