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https://issues.apache.org/jira/browse/JCLOUDS-1333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16438773#comment-16438773
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ASF subversion and git services commented on JCLOUDS-1333:
----------------------------------------------------------

Commit e8e68c4008201d4da48183cadc37858475003adc in jclouds-labs's branch 
refs/heads/master from [~gaul]
[ https://git-wip-us.apache.org/repos/asf?p=jclouds-labs.git;h=e8e68c4 ]

JCLOUDS-1333: Fix Java 8 and Guava 21 issues


> 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
>            Priority: Major
>              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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