[ https://issues.apache.org/jira/browse/NETBEANS-407?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Eirik Bakke updated NETBEANS-407: --------------------------------- Description: 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 . was: 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} > "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 - FindBugs, java - Hints > Affects Versions: 8.2, 9.0 > Reporter: Eirik Bakke > Priority: Minor > > 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 . -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@netbeans.apache.org For additional commands, e-mail: commits-h...@netbeans.apache.org For further information about the NetBeans mailing lists, visit: https://cwiki.apache.org/confluence/display/NETBEANS/Mailing+lists