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Posted to notifications@jclouds.apache.org by "ASF subversion and git services (JIRA)" <ji...@apache.org> on 2017/09/07 08:43:00 UTC
[jira] [Commented] (JCLOUDS-1333) Cannot compile jclouds with Guava
21+
[ https://issues.apache.org/jira/browse/JCLOUDS-1333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16156696#comment-16156696 ]
ASF subversion and git services commented on JCLOUDS-1333:
----------------------------------------------------------
Commit d7d28fe7d7f9e9136a48f3bd99a68ea667837720 in jclouds's branch refs/heads/master from [~gaul]
[ https://git-wip-us.apache.org/repos/asf?p=jclouds.git;h=d7d28fe ]
JCLOUDS-1333: Correct JDK 1.8 method overloading
Newer JDK have a different resolution process, likely due to enhanced
target type inference. Found via:
mvn test -Dmaven.compile.source=1.8 -Dmaven.compile.target=1.8
> Cannot compile jclouds with Guava 21+
> -------------------------------------
>
> Key: JCLOUDS-1333
> URL: https://issues.apache.org/jira/browse/JCLOUDS-1333
> Project: jclouds
> Issue Type: Improvement
> Components: jclouds-core
> Affects Versions: 2.1.0
> Reporter: Andrew Gaul
> Labels: guava
>
> jclouds has compatibility with Guava 18-22 but we cannot compile using 21+ due to some kind of Guava vs Java 8 Function class type error:
> {noformat}
> /home/gaul/work/jclouds/core/src/main/java/org/jclouds/rest/internal/TransformerForRequest.java:102: error: method compose in interface java.util.function.Function<T,R> cannot be applied to given types;
> transformer = compose(Function.class.cast(wrappingTransformer), transformer);
> ^
> required: java.util.function.Function<? super V,? extends HttpRequest>
> found: com.google.common.base.Function,com.google.common.base.Function<HttpResponse,CAP#1>
> reason: cannot infer type-variable(s) V
> (actual and formal argument lists differ in length)
> where V,T,R are type-variables:
> V extends Object declared in method <V>compose(java.util.function.Function<? super V,? extends T>)
> T extends Object declared in interface java.util.function.Function
> R extends Object declared in interface java.util.function.Function
> where CAP#1 is a fresh type-variable:
> CAP#1 extends Object from capture of ?
> /home/gaul/work/jclouds/core/src/main/java/org/jclouds/rest/internal/TransformerForRequest.java:189: error: method compose in interface java.util.function.Function<T,R> cannot be applied to given types;
> transformer = compose(new OnlyElementOrNull(), transformer);
> ^
> required: java.util.function.Function<? super V,? extends HttpRequest>
> found: OnlyElementOrNull,com.google.common.base.Function<HttpResponse,CAP#1>
> reason: cannot infer type-variable(s) V
> (actual and formal argument lists differ in length)
> where V,T,R are type-variables:
> V extends Object declared in method <V>compose(java.util.function.Function<? super V,? extends T>)
> T extends Object declared in interface java.util.function.Function
> R extends Object declared in interface java.util.function.Function
> where CAP#1 is a fresh type-variable:
> CAP#1 extends Object from capture of ?
> {noformat}
> This does not affect applications from using Guava 21-22 but does impact our compatibility testing. Note that you need to set {{maven.compile.source}} to 1.8 to test Guava 21+.
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