JD.VNU.NULL
JD.VNU.NULL shows that the null value assigned to a variable was never read after assignment.
Vulnerability and risk
In most cases, it is just a redundant initialization code, but sometimes, it can signify a major logical error.
Mitigation and prevention
Optimize the code and remove the unused assignments.
Example 1
16 Reader prepareReader(Reader r) {
17 BufferedReader bufferedReader = null;
18
19 try {
20 bufferedReader = new BufferedReader(r);
21 register(bufferedReader);
22 } catch (Exception e) {
23 e.printStackTrace();
24 }
25
26 return bufferedReader;
27 }
28
29 private void register(BufferedReader bufferedReader) {
30 // ...
31 }
JD.VNU.NULL is reported for line 17: BufferedReader constructor does not throw exceptions, so the 'bufferedReader' variable is always reassigned on line 20.
