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From "Philip Lopez (JIRA)" <j...@apache.org>
Subject [jira] Updated: (TAP5-927) Cannot use Scala for Tapestry IOC Modules
Date Thu, 12 Nov 2009 13:16:39 GMT

     [ https://issues.apache.org/jira/browse/TAP5-927?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Philip Lopez updated TAP5-927:

    Priority: Minor  (was: Major)

changed priority to minor: workaround is to use Tapestry 5.0.x or to avoid Scala for modules.

> Cannot use Scala for Tapestry IOC Modules
> -----------------------------------------
>                 Key: TAP5-927
>                 URL: https://issues.apache.org/jira/browse/TAP5-927
>             Project: Tapestry 5
>          Issue Type: Improvement
>          Components: tapestry-ioc
>    Affects Versions:
>            Reporter: Philip Lopez
>            Priority: Minor
> Scala (as of 2.7.7) adds a public method $tag() to classes. It's not particularly pretty
(and $tag() is apparently deprecated) but it's there. (See http://programming-scala.labs.oreilly.com/ch14.html#CommandLineToolDecompilers)
> The (new, in 5.1.0.x) checks in org.apache.tapestry5.ioc.internal.DefaultModuleDefImp
mean that a module implemented in Scala throws an exception on load: 
> java.lang.RuntimeException: Module class <MODULE_NAME> contains unrecognized public
methods: public static final int <MODULE_NAME>.$tag() throws java.rmi.RemoteException.
> It would be nice to have a way to work around this so that Scala could be used with Tapestry
IOC 5.1.0.x (including Modules). One generic approach may be  to have an @IgnoredPublicMethods
annotation applicable to Module classes that took an array of Strings that named methods that
should also be removed from the "methods" set before checking whether there are superfluous
public methods. Of course, there's always the hard-code exception too (ugly but a lot less
"investment" for this pesky incompatibility).
> As an example, the following article describes Scala and Tapestry: http://fanf42.blogspot.com/2009/02/tapestry-5-scala-view-article-in-html.html.
If you checkout the git project and update the Tapestry release version to, you'll
see it fail, where in 5.0.x it worked.
> The relevant code is:
> 109            // Want to verify that every public method is meaningful to Tapestry IoC.
 Remaining methods might
> 110            // have typos, i.e., "createFoo" that should be "buildFoo".
> 111    
> 112            Set<Method> methods = CollectionFactory.newSet(moduleClass.getMethods());
> 113    
> 114            methods.removeAll(OBJECT_METHODS);
> 115    
> 116            boolean modulePreventsServiceDecoration = moduleClass.getAnnotation(PreventServiceDecoration.class)
!= null;
> 117    
> 118            grind(methods, modulePreventsServiceDecoration);
> 119            bind(methods, modulePreventsServiceDecoration);
> 120    
> 121            if (methods.isEmpty()) return;
> 122    
> 123            throw new RuntimeException(String.format("Module class %s contains unrecognized
public methods: %s.",
> 124                                                     moduleClass.getName(),
> 125                                                     InternalUtils.joinSorted(methods)));

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