IcedTea6 >= 1.8 x Oracle JDK 6 compiler incompatibility

[Dr Andrew John Hughes]

On 17:33 Mon 14 Mar     , Pavel Tisnovsky wrote:
> Hi all,
> 
> There seems to be a compiler incompatibility between recent Oracle JDK 6
> (build 1.6.0_24-b07) and IcedTea6 versions 6-1.8 and newest.
> 

By 'Oracle JDK 6', do you mean the proprietary JDK?  

If so, this isn't much help to us, as we don't have the source code
for this and we've already ascertained, when looking at previous
issues, that its' javac is different from the OpenJDK javac.

> While trying to compile source included in attachment [TreeMapTest.java]
>  source is compiled without warnings using Oracle JDK 6 or (for example)
> IcedTea6-1.7. But IcedTea6-1.8, 6-1.9 and 6 HEAD fail to compile with
> following error messages:
> 

Ok so this is a regression between IcedTea6 1.7 and IcedTea6 1.8.  I suggest
having a look at what changesets were pushed to the OpenJDK6 langtools repository
between b17 (IcedTea6 1.7) and b18 (IcedTea6 1.8).  It's also worth checking
which patches are being applied by each IcedTea.

> TreeMapTest.java:5: incompatible types; no instance(s) of type
> variable(s) K,V exist so that java.util.TreeMap<K,V> conforms to
> java.util.Map<java.lang.String,java.lang.Object>
> found   : <K,V>java.util.TreeMap<K,V>
> required: java.util.Map<java.lang.String,java.lang.Object>
>     private Map<String, Object> map1 = newTreeMap(Collator.getInstance());
>                                                  ^
> TreeMapTest.java:8: incompatible types; no instance(s) of type
> variable(s) K,V exist so that java.util.TreeMap<K,V> conforms to
> java.util.Map<java.lang.String,java.lang.Object>
> found   : <K,V>java.util.TreeMap<K,V>
> required: java.util.Map<java.lang.String,java.lang.Object>
>     private Map<String, Object> map2 = newTreeMap(new Comparator<String>()
>                                                  ^
> 2 errors
> 
> Do anyone have any idea what's wrong? Similar code is used in RichFaces
> so peoples compiling this framework is having problems using IcedTea on
> its machines.
> 
> Cheers
> Pavel

> import java.util.*;
> import java.text.*;
> 
> public class TreeMapTest {
>     private Map<String, Object> map1 = newTreeMap(Collator.getInstance());
> 
>     // using custom Comparator does not help
>     private Map<String, Object> map2 = newTreeMap(new Comparator<String>()
>         {
>             public int compare(String s1, String s2) {
>                 return s1.compareTo(s2);
>             }
>         }
>     );
> 
>     public <C, K extends C, V> TreeMap<K, V> newTreeMap(Comparator<C> comparator) {
>         return new TreeMap<K, V>(comparator);
>     }
> }
> 


-- 
Andrew :)

Free Java Software Engineer
Red Hat, Inc. (http://www.redhat.com)

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