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-------- Forwarded Message -------- Subject: Re: Type conversion collection with interface type elements Date: Thu, 5 Apr 2018 13:02:01 +0000 From: Yasser Zamani <yasserzam...@apache.org> Reply-To: Struts Users Mailing List <user@struts.apache.org> To: user@struts.apache.org <user@struts.apache.org> On 4/4/2018 7:20 PM, Nuno Oliveira wrote: > Hi, > > I am having problems populating an action variable Set by request using > struts type conversion if the Set has the element type defined as an > interface. > I have a UserAction-conversion.properties file with the following > configuration using the class implementation: > > KeyProperty_roles=id > Element_roles=path.to.class.Roles > CreateIfNull_roles=true > > And UserAction has the collection Set<RolesInterface>. Roles obviously > implements RolesInterface. > > If the Set element type <RolesInterface> is deleted it works just fine. > Am I doing something wrong or is this not possible? I reproduced it and seems it's because it tries to instantiate a new element but the interface cannot being instantiated. Please see [1] to know why it tries to instantiate interface instead of class. Annotating the getRoles or setRoles method with @Element(value = path.to.class.Roles.class) may fix this issue. (shouldn't it be path.to.class.Role instead? it seems Roles is a list not element) Regards. [1] github.com/apache/struts/blob/05829e3faadd15cfa67eb234cd1775f2b98918cb/core/src/main/java/com/opensymphony/xwork2/conversion/impl/DefaultObjectTypeDeterminer.java#L100 > > Thanks >
