scala reflection error java

Question

I'm trying to use scala.reflect to get the class attributes and to write them XML. However I'm getting a strange error

 def toXml(): xml.Elem = {
<node>{
  for(field: scala.reflect.Field <- getClass().getDeclaredFields()) {
    val tmpString = "<" + field.name + ">" + this.getClass().getMethods.find(_.getName == field.name).get.invoke(this) + "</" + field.name + ">"
    print(tmpString)
  }
 }</node>
}

The error:

error: type mismatch;
found   : scala.reflect.Field => Unit
required: java.lang.reflect.Field => ?
for(field: scala.reflect.Field <- getClass().getDeclaredFields()) {

So even if I explicitly use scala.reflect.Field, it still is viewed as java.lang.reflect.Field?

Geo · Accepted Answer · 2011-11-08 17:00:40Z

7

getClass().getDeclaredFields() returns java.lang.reflect.Field objects. Unless you find a way to convert between these two classes, you cannot declare them as scala.reflect.Field and expect them to work.

EDIT: fix for your code:

for(field: java.lang.reflect.Field <- getClass().getDeclaredFields()) {

edited Nov 8, 2011 at 17:00

answered Nov 7, 2011 at 17:10

Geo

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3 Comments

user485659 Over a year ago

is there any way to get the list of class fields in scala?

Geo Over a year ago

@user485659, see the edit. Keep in mind that in a lot of cases, you don't even need to declare the type, as it will be inferred.

user485659 Over a year ago

Thanks, however I'm facing another issue here now, I'm trying to get the type of an attribute that refers to a custom class, I just get that it's of type Object My code: <edge>{ for(field: java.lang.reflect.Field <- getClass().getDeclaredFields()) yield <field name={field.getName()} tpe={field.getType().toString()}>{ this.getClass().getMethods.find(_.getName == field.getName()).get.invoke(this) }</field> }</edge>

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