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Date: Sun, 2 Aug 2009 19:51:15 -0700 (PDT)
From: "Nathan Beyer (JIRA)" <jira@apache.org>
To: commits@harmony.apache.org
Subject: [jira] Commented: (HARMONY-6289) Inconsistent behaviour of ternary
 operator and types
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    [ https://issues.apache.org/jira/browse/HARMONY-6289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12738172#action_12738172 ] 

Nathan Beyer commented on HARMONY-6289:
---------------------------------------

It's not a bug, this is actually the correct behavior, at least as I understand it. You can talk to the ECJ for Sun javac folks to get more information. This is just a quirk of the generics syntax. The correct syntax for the ternary operator in this case would be as follows.

functions = funcs != null ? funcs : Collections<String, Object>.emptyMap();

> Inconsistent behaviour of ternary operator and types
> ----------------------------------------------------
>
>                 Key: HARMONY-6289
>                 URL: https://issues.apache.org/jira/browse/HARMONY-6289
>             Project: Harmony
>          Issue Type: Bug
>          Components: JDK
>    Affects Versions: 5.0M10
>         Environment: Eclipse Java Compiler 0.894_R34x, 3.4.2 release, Copyright IBM Corp 2000, 2008. All rights reserved.
> WinXP/SP3
>            Reporter: Sebb
>
> Compile the following class using: javac -5 TernaryType.java
> ==== cut here ====
> import java.util.*;
> class TernaryType {
>     
>     Map<String, Object> functions;
>     public void setFunctionsBug(Map<String, Object> funcs) {
>         functions = funcs != null ? funcs : Collections.emptyMap();
>     }
>     public void setFunctionsOK(Map<String, Object> funcs) {
> 		if (funcs != null) {
>             functions = funcs;
>         } else {
> 			functions = Collections.emptyMap();
> 		}
>     }
> }
> === cut here ===
> Compiler output is:
> 1. ERROR in TernaryType.java (at line 8)
>         functions = funcs != null ? funcs : Collections.emptyMap();
>                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> Type mismatch: cannot convert from Map<capture#1-of ? extends Object,Object> to Map<String,Object>
> The two methods have exactly the same behaviour, yet only the ternary version generates an error.
> Note that the Sun 1.5 and 1.6 compilers behave the same way, but it still seems like a bug to me.

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