[jira] [Created] (JCLOUDS-1333) Cannot compile jclouds with Guava 21+

["Andrew Gaul (JIRA)" <ji...@apache.org>]

Andrew Gaul created JCLOUDS-1333:
------------------------------------

             Summary: 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


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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