[jira] Commented: (JANINO-131) instanceof returns true for null values, instead of false

> instanceof returns true for null values, instead of false
> ---------------------------------------------------------
>
>                 Key: JANINO-131
>                 URL: http://jira.codehaus.org/browse/JANINO-131
>             Project: Janino
>          Issue Type: Bug
>    Affects Versions: 2.5.15
>         Environment: Windows XP
> Java 1.4.x
> Java 1.6.x
>            Reporter: Mario Alberto Ortegón Cabrera
>            Assignee: Arno Unkrig
>            Priority: Critical
>             Fix For: 2.5.15
>
>         Attachments: instanceof.diff
>
>
> We created the following test class:
> import java.util.List;
> public class InstanceofTest {
>     public static void main(String[] args) {
> boolean b = null instanceof List;
> System.out.println("null instanceof List = " + b);
> List aList = null;
> boolean c = (aList instanceof List);
> System.out.println("aList instanceof List = " + c);
>     }
> }
> We compiled with janino using:
> "%JAVA_HOME%/bin/java" -cp F:\dev\lib\janino-2.5.15\lib\janino.jar org.codehaus.janino.Compiler InstanceofTest.java
> After execution we get:
> null instanceof List = true
> aList instanceof List = true
> We compiled with java using:
> "%JAVA_HOME%/bin/javac" InstanceofTest.java
> After execution
> "%JAVA_HOME%/bin/java" InstanceofTest
> we get:
> null instanceof List = false
> aList instanceof List = false
> So the behavior is clearly different