Compilation error with JDK8 and Guava (original) (raw)

Remi Forax forax at univ-mlv.fr
Tue Apr 2 05:54:30 PDT 2013

On 04/02/2013 01:20 PM, Sven Reimers wrote:

Hi Rémi,

do you think of the b83 lambda build? The early access at http://jdk8.java.net/download.html still shows b82..

The current lambda build is b83, http://jdk8.java.net/lambda/

The current jdk8 build is b82.

Thanks Sven

cheers, Rémi

On Tue, Apr 2, 2013 at 11:45 AM, Remi Forax <forax at univ-mlv.fr_ _<mailto:forax at univ-mlv.fr>> wrote: On 04/02/2013 08:50 AM, Olivier Bourgain wrote: > Hi all, > > I tried to compile my project at work with the JDK 8 and I get a > compilation error. > > The simplest example which I was able to extract is the following. It uses > Guava 1.14.0.1. Hi Olivier, could you test with b83 because it looks like a bug that was fixed recently. cheers, Rémi > > import java.util.LinkedHashMap; > import java.util.List; > import java.util.Map; > import com.google.common.collect.Lists; > > public class TestCase { > > public static <K, V> Map<K, V> reverseMap(List<Map.Entry<K,_ _V>> list) { > return toMap(Lists.reverse(list)); > } > > public static <K, V> Map<K, V> toMap(List<Map.Entry<K, V>> list) { > Map<K, V> result = new LinkedHashMap<>(); > for (Map.Entry<K, V> entry : list) > result.put(entry.getKey(), entry.getValue()); > return result; > } > } > > The compilation error is : > > » javac -cp lib/guava-14.0.1.jar src/TestCase.java > src/TestCase.java:9: error: method toMap in class TestCase cannot be > applied to given types; > return toMap(Lists.reverse(list)); > ^ > required: List<Entry<K#1,V#1>> > found: List<Entry<K#2,V#2>> > reason: inferred type does not conform to equality constraint(s) > inferred: Entry<Object,Object> > equality constraints(s): Entry<Object,Object>,Entry<K#2,V#2> > where K#1,V#1,K#2,V#2 are type-variables: > K#1 extends Object declared in method > <K#1,V#1>toMap(List<Entry<K#1,V#1>>) > V#1 extends Object declared in method > <K#1,V#1>toMap(List<Entry<K#1,V#1>>) > K#2 extends Object declared in method > <K#2,V#2>reverseMap(List<Entry<K#2,V#2>>) > V#2 extends Object declared in method > <K#2,V#2>reverseMap(List<Entry<K#2,V#2>>) > 1 error > > > The java version is : > > java version "1.8.0-ea" > Java(TM) SE Runtime Environment (build 1.8.0-ea-b82) > Java HotSpot(TM) Server VM (build 25.0-b23, mixed mode) > > The same code compiles without error with Java 1.7. > > > Olivier Bourgain >

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