While ``++null++`` is technically a valid ``++Boolean++`` value, that fact, and the distinction between ``++Boolean++`` and ``++boolean++`` is easy to forget. So returning ``++null++`` from a ``++Boolean++`` method is likely to cause problems with callers' code.


== Noncompliant Code Example

[source,java]
----
public Boolean isUsable() {
  // ...
  return null;  // Noncompliant
}
----


== See

* https://cwe.mitre.org/data/definitions/476[MITRE, CWE-476] - NULL Pointer Dereference
* https://wiki.sei.cmu.edu/confluence/x/aDdGBQ[CERT, EXP01-J.] - Do not use a null in a case where an object is required

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== Implementation Specification
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