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https://issues.apache.org/jira/browse/JCLOUDS-1333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16327503#comment-16327503
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Ignasi Barrera commented on JCLOUDS-1333:
-----------------------------------------
I had a quick WIP where I fixed the failures mentioned in the issue but then
ran into others more esoteric that were caused (presumably) by several open
bugs in certain JDK versions, and I abandoned it.
A more serious work needs to be done to properly fix this
> 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
> Assignee: Ignasi Barrera
> 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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