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From "Aleksandar Nikolov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (TAP5-1530) Library of mixins
Date Mon, 23 May 2011 14:50:47 GMT
Library of mixins

                 Key: TAP5-1530
                 URL: https://issues.apache.org/jira/browse/TAP5-1530
             Project: Tapestry 5
          Issue Type: Bug
          Components: tapestry-core
    Affects Versions: 5.2.5
            Reporter: Aleksandar Nikolov

I had developed a library of several mixins in Tapestry v. Classes are packed by maven
in a jar file and added to the main project as a maven dependency. It worked pretty well with
I followed the rules at http://tapestry.apache.org/component-libraries.html and the eldest

Now I am trying to migrate the library to Tapestry 5.2.5, but found a problem in loading mixins
in the main project:

Case 1: When I use "core" library mapping in library module class:

    public static void contributeComponentClassResolver(Configuration<LibraryMapping>
configuration) {
        configuration.add(new LibraryMapping("core", "com.mylib"));

 and template code like this: "<t:pagelink page="index" t:mixins="myMixin">...</t:pagelink>"
then the following exception is thrown:

Caused by: org.apache.tapestry5.ioc.util.UnknownValueException: Unable to resolve 'myMixin'
to a mixin class name.
    at org.apache.tapestry5.internal.services.ComponentClassResolverImpl$7.invoke(ComponentClassResolverImpl.java:516)
    at org.apache.tapestry5.internal.services.ComponentClassResolverImpl$7.invoke(ComponentClassResolverImpl.java:511)
    at org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:85)
    at org.apache.tapestry5.internal.services.ComponentClassResolverImpl.resolveMixinTypeToClassName(ComponentClassResolverImpl.java:509)
    at $ComponentClassResolver_1301a3347ae.resolveMixinTypeToClassName($ComponentClassResolver_1301a3347ae.java)
    at org.apache.tapestry5.internal.pageload.EmbeddedComponentAssemblerImpl.<init>(EmbeddedComponentAssemblerImpl.java:110)
    at org.apache.tapestry5.internal.pageload.ComponentAssemblerImpl.createEmbeddedAssembler(ComponentAssemblerImpl.java:276)
    ... 106 more

Case 2: When I use another (my own) library mapping name and template code like this: "<t:pagelink
page="index" w:mixins="myMixin">...</t:pagelink>" then Tapestry acts as the mixins
is not attached to the Pagelink. Just nothing happens.

The only workaround I found is to move the mixins from the library to the main project. Then
all mixins can be attached. The problem appears only when the mixins are placed in external

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