[jira] [Comment Edited] (JEXL-192) Invalid return type when expected result is null

["Constantin Mitocaru (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JEXL-192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15206556#comment-15206556 ] 

Constantin Mitocaru edited comment on JEXL-192 at 3/22/16 4:31 PM:
-------------------------------------------------------------------

Please make it so your method returns null sometimes. For instance:

{code}
 	public static class C192 {
        public C192() {}

        public static Integer callme(Integer n) {
            if (n == null) {
                return null;
            } else {
                return n >= 0? 42 : -42;
            }
        }
    }
{code}    


was (Author: biliboc):
Please make it so you method returns null sometimes. For instance:

{code}
 	public static class C192 {
        public C192() {}

        public static Integer callme(Integer n) {
            if (n == null) {
                return null;
            } else {
                return n >= 0? 42 : -42;
            }
        }
    }
{code}    

> Invalid return type when expected result is null
> ------------------------------------------------
>
>                 Key: JEXL-192
>                 URL: https://issues.apache.org/jira/browse/JEXL-192
>             Project: Commons JEXL
>          Issue Type: Bug
>    Affects Versions: 3.0
>            Reporter: Constantin Mitocaru
>            Assignee: Henri Biestro
>            Priority: Blocker
>             Fix For: 3.1
>
>
> In jexl2 this code correctly outputs the line:
> {code}
> null
> {code}
> {code:java}
>         JexlEngine jexl = new JexlEngine();
>         Record r = new Record();
>         r.setHeader(new RecordHeader());
>         JexlContext jc = new MapContext();
>         jc.set("r", r );
>         jc.set("com.s.objects.record.RecordUtils", com.s.objects.record.RecordUtils.class );
>         Expression e = jexl.createExpression( "com.s.objects.record.RecordUtils.getHeaderAgeOrResolveItFromDOB(r)" );
>         System.out.println( e.evaluate(jc) );        
> {code}
> The signature of the method getHeaderAgeOrResolveItFromDOB() is:
> {code:java}
>         public static Integer getHeaderAgeOrResolveItFromDOB( final Record rec ) {
>         ...
>         }
> {code}
> But in jexl3 this code produces:
> {code}
> 	class com.s.objects.record.RecordUtils
> {code}
> {code:java}
>         JexlEngine jexl = new JexlBuilder().create();
>         Record r = new Record();
>         r.setHeader(new RecordHeader());
>         JexlContext jc = new MapContext();
>         jc.set("r", r );
>         jc.set("com.s.objects.record.RecordUtils", com.s.objects.record.RecordUtils.class );
>         JexlExpression e = jexl.createExpression( "com.s.objects.record.RecordUtils.getHeaderAgeOrResolveItFromDOB(r)" );
>         System.out.println( e.evaluate(jc) );        
> {code}
> So it returns the class of the utility rather than the value null! For non null values it returns the proper type (Integer);
> I think jexl3 version 3.0 was not really ready for prime time.
> I really screwed up my project upgrading to 3.0.
> When do you guys anticipate to release 3.1?
> Is there a way to work with a snapshot after this fix?



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