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<p style="margin: 10px 0 0 0">Ok, here comes the second part of the puzzle. The first part is the problem in <tt>ValidationExtension</tt>. Here the problem is that the original method must be used in <tt>determineConstrainedMethod</tt> when passed to <tt>isNonGetterConstrained</tt>, even if the original method was overwritten. This is necessary to ensure that the metdatata look-up via <tt>BeanDescriptor#getConstraintsForMethod</tt> will work. This is indeed convoluted in itself. If, however, the original method is used for the metadata lookup, the right interceptor bindings get created.</p>
<p style="margin: 10px 0 0 0">Now the second problem is <tt>ValidationInterceptor</tt>. Note, that the <tt>ValidatorFactory</tt> and hence the metadata cache is not shared. <tt>ValidationExtension</tt> bootstraps its on <tt>Validator</tt> just in order to determine which classes need interceptor bindings. Once <tt>ValidationInterceptor#validateMethodInvocation</tt> is called we are dealing with a different <tt>ValidatorFactory</tt> which is now the mananged CDI bean created by <tt>ValidationExtension</tt>. So initially the metadata cache is all empty and need to be re-created. This is of course not a problem per se. The problem is that the invocation instance provided by <tt>InvocationContext.getTarget</tt> is a Weld proxy. Later on in <tt>ValidationContext#forValidateParameters</tt> this proxy is used to set the <tt>rootBean</tt> and <tt>rootBeanClass</tt>. So the metadata created is really for the proxy class, not for <tt>StringImpl</tt>. This seems to work for most cases, but not for the generic use-case as in the test case. My guess is that the override checks with classmate fail in this case and hence the metadata for the proxy is different from the metadata of <tt>StringImpl</tt> itself (in fact the metadata of the proxy does not contain metadata for <tt>genericArg(String)</tt>.</p>
<p style="margin: 10px 0 0 0">Really, one should generate the metadata for the proxied class, not for the proxy itself (this would also reduce a lot of unnecessary metadata creation and storage). Adding a check for a Weld proxy to <tt>ValidationContext#forValidateParameters</tt> which will set the <tt>rootBeanClass</tt> to the proxied class will make the test pass. The rub here is that this check is Weld specific. It would not work for any other proxied classes. It also needs to be checked in the engine module which cannot have a hard reference to CDI/Weld, so all proxy detection and unwrapping needs to happen via reflection. </p>
<p style="margin: 10px 0 0 0">The question of dealing with proxies has come up before (I think in the context of cascaded validation and dealing with ORM association proxies). To offer the possibility to support other types of proxies one would need a customizable proxy detection contract which would be used whenever a class needs to inferred from an instance to be validated. </p>
<p style="margin: 10px 0 0 0">Thoughts?</p>
<p style="margin: 10px 0 0 0">BTW, we already have some Weld proxy specific code when it comes to dealing with class hierarchies. Maybe in a first step we make it work for Weld proxies and extend this to a generic contract later!?</p>
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