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Code Analyzer for Java

There is a newer version: 8.10.0.38194

Why is this an issue?
Calling toString() or clone() on an object should always return a string or an object. Returning null
instead contravenes the method’s implicit contract.
Noncompliant code example
public String toString () {
  if (this.collection.isEmpty()) {
    return null; // Noncompliant
  } else {
    // ...

Compliant solution
public String toString () {
  if (this.collection.isEmpty()) {
    return "";
  } else {
    // ...

Resources

   CWE - CWE-476 - NULL Pointer Dereference 
   CERT, EXP01-J. - Do not use a null in a case where an object is required