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I have three Classes. A Base Class, a Sub Class who extends from the Base Class and a Sub Class who extends from the First Sub Class like This:

@Service
public abstract class BaseClass<T> {
   private Type type = ((ParameterizedType)this.getClass().getGenericSuperclass()).getActualTypeArguments()[0]
}

@Service
public class SubClass extends BaseClass<MyType> {

   private static final String URL = "/test"

   public MyType mainMethodOfThisClass(...) {
      ...
   }

   protected String getUrl() {
      return URL;
   }
}

@Service
public class SubSubClass extends SubClass{

   private static final String URL = "/test/test"  

   @Override
   protected String getUrl() {
      return URL;
   }
}

Now i get

"Error creating bean with name 'SubSubClass' Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate Caused by: java.lang.ClassCastException: java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType

I define the Type in my SubClass. Why i must define the Type again in SubSubClass?

Improve this question
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  • 1
    You can't run from your problems by hiding them. See here, here, here, here, and here for similar questions, found with a quick google search. Commented Jan 10, 2017 at 10:01
  • I also foundd this Questions. But there was no Solution for my Problem. I Don't understand why it works when it looks like: public class SubClass<T> extends BaseClass<MyType> {} public class SubSubClass extends SubClass<MyType> { Commented Jan 10, 2017 at 10:08
  • You're telling me nowhere in your code do you have (ParameterizedType) getClass().getGenericSuperclass()? Come on... Commented Jan 10, 2017 at 10:10
  • I have it in my BaseClass. But in my SubClass i define the Type. Why i must do it again in my SubSubClass? Commented Jan 10, 2017 at 10:14
  • Aha! Slowly, painstakingly, a confession is extracted... Commented Jan 10, 2017 at 10:16
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