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https://issues.apache.org/jira/browse/TAP5-2560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16738867#comment-16738867
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ASF subversion and git services commented on TAP5-2560:
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Commit bc7199284f049f1e8f7b2b6589b5b02014c8d634 in tapestry-5's branch
refs/heads/5.4.x from Thiago H. de Paula Figueiredo
[ https://git-wip-us.apache.org/repos/asf?p=tapestry-5.git;h=bc71992 ]
TAP5-2560: adding unit test.
> Error in GenericsUtils affecting property access
> ------------------------------------------------
>
> Key: TAP5-2560
> URL: https://issues.apache.org/jira/browse/TAP5-2560
> Project: Tapestry 5
> Issue Type: Bug
> Affects Versions: 5.4.1
> Reporter: Chris Poulsen
> Assignee: Thiago H. de Paula Figueiredo
> Priority: Major
> Attachments: generics-utils.patch
>
>
> There is an error somewhere in the GenericsUtils.resolve( TypeVariable
> typeVariable, Type containingType ) method.
> It resolves some type variables to their lower bound instead of the correct
> version.
> We have model classes that uses lots of generics and in some cases tapestry
> reports that a given property expression is invalid because some lower bound
> interface does not contain the property in the expression.
> I tried to see if I could find an easy fix, but ended up running out of time
> and simply replaced the bodies of the 5 resolution methods in the
> GenericsUtils with guava reflect code and then things started working as
> expected.
> The interface setup that gives the error looks like this:
> {code}
> public interface NonTranslatableContentUnit<T extends ContentData> {
> T getContent();
> }
> public interface BinaryContentUnit<T extends BinaryContent> extends
> NonTranslatableContentUnit<T> {}
> public interface FileContentUnit extends BinaryContentUnit<FileContent> {}
> public interface ContentData {
> isEmpty();
> ...
> }
> public interface BinaryContent extends ContentData {
> String getMimeType();
> ...
> }
> public interface FileContent extends BinaryContent {}
> {code}
> Then we have a property expression on a FileContentUnit like:
> "content.mimeType" and that fails with an error that says something like
> ContentData does not have a property MimeType.
> As far as I can tell the resolve(TypeVariable, ..) method fails to do
> anything sensible if the Type of the "containing class" is not an instance of
> ParameterizedType
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