Converter creates wrong value for GenericDomValue

Hi,

i'm writing a plugin for my company, which handles a special kind of XML-file. Inside this XML, there are some lines like:

<template model="ViewModelName">path to a JSP</template>

where ViewModelName is a name of a viewmodel and path to  a JSP a path to  a JSP-template.

Given this, i've written an interface to handle these both informations:

internal interface Template : DomElement {

@Convert(JSPFileConverter::class)
@TagValue
@Required
fun getValue(): GenericDomValue<PsiFile?>

 @Convert(ModelConverter::class)
 fun getModel(): GenericAttributeValue<Collection<PsiClass>>
}

Both converters will be called. The ModelConverter returns a collection of PsiClass and this works well. When reading from getModel(), I'll get the GenericAttributeValue and so on.

The problem is when reading from getValue().

val value = element.getValue()

The JSPFileConverter returns a PsiFile. This works and should be translated to a GenericDomValue<PsiFile?>, similar to the code above. But then, I'll get a ClassCasException:

java.lang.ClassCastException: com.intellij.psi.impl.source.jsp.JspFileImpl cannot be cast to com.intellij.util.xml.GenericDomValue

This means, getValue() is declared as returning a GenericDomValue<PsiFile?> but in reality it returns the calculated PsiFile.

I need this GenericDomValue for positioning an error in an inspection:

internal class MissingJSPValidation : BasicDomElementsInspection<Config>() {
 override fun checkDomElement(element: DomElement, holder: DomElementAnnotationHolder, helper: DomHighlightingHelper) {
 if (element is Template) {
   val value = element.getValue()
   val fileName = value.stringValue
   if (fileName == null) {
     holder.createProblem(value, message("no.file.set"))
   } else if (fileName.isNotEmpty() && element.jspFile() == null) {
     holder.createProblem(value, message("file.doesnt.exist", fileValue))
   }
 }
 }
}

What is the difference?