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Posted to commits@netbeans.apache.org by "Jan Lahoda (JIRA)" <ji...@apache.org> on 2018/03/29 05:19:00 UTC
[jira] [Updated] (NETBEANS-407) "Dereferencing possible null
pointer" after doing instanceof on variable (false positive)
[ https://issues.apache.org/jira/browse/NETBEANS-407?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jan Lahoda updated NETBEANS-407:
--------------------------------
Component/s: (was: java - FindBugs)
> "Dereferencing possible null pointer" after doing instanceof on variable (false positive)
> -----------------------------------------------------------------------------------------
>
> Key: NETBEANS-407
> URL: https://issues.apache.org/jira/browse/NETBEANS-407
> Project: NetBeans
> Issue Type: Bug
> Components: java - Hints
> Affects Versions: 8.2, 9.0
> Reporter: Eirik Bakke
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 20m
> Remaining Estimate: 0h
>
> In the following example, the "boolean foo = k instanceof Integer" assignment causes a spurious "Dereferencing possible null pointer" warning to occur on the "k.doubleValue()" expression. I believe this did not happen in earlier NetBeans versions (pre-8.2). Note that if the assignment to "boolean foo" is replaced by an if statement ("if (k instanceof Integer)"), the warning goes away.
> {code:java}
> public class TestClass {
> private Number getFoo() {
> return 3;
> }
> public void testFoo() {
> Number k = getFoo();
> // The warning only occurs if this assignment is present.
> boolean foo = k instanceof Integer;
> // Warning on .doubleValue() here: "Dereferencing possible null pointer"
> System.out.println(k.doubleValue());
> }
> }
> {code}
> This bug was previously described at https://netbeans.org/bugzilla/show_bug.cgi?id=269324 .
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