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How to specify which version of a concrete implementation for an abstract class to autowire in Spring?


How to specify which version of a concrete implementation for an abstract class to autowire in Spring?

By : Poul
Date : October 22 2020, 08:10 PM
will help you Remove the @Service annotation, instead write a @Bean-annotated method in a configuration class that reads the properties, and returns the appropriate A instance.
code :


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How to deserialize concrete implementation of abstract class from XML

How to deserialize concrete implementation of abstract class from XML


By : user6495205
Date : March 29 2020, 07:55 AM
I hope this helps you . Add [XmlRoot(ElementName = "FooData", Namespace = "http://foo.bar")] to the sub-classes
here is an example I made:
code :
  [XmlIncludeAttribute(typeof(ConcreteFooOne))]
  [XmlIncludeAttribute(typeof(ConcreteFooTwo))]
  [XmlIncludeAttribute(typeof(ConcreteFooThree))]
  [XmlRoot(ElementName = "FooData", Namespace = "http://foo.bar")]
  public abstract partial class AbstractFoo
  {
    // Some abstract props etc.
  }

  [XmlRoot(ElementName = "FooData", Namespace = "http://foo.bar")]
  public class ConcreteFooOne : AbstractFoo
  {
    public int MyProp { get; set; }
  }
  [XmlRoot(ElementName = "FooData", Namespace = "http://foo.bar")]
  public class ConcreteFooTwo : AbstractFoo
  {

  }
  [XmlRoot(ElementName = "FooData", Namespace = "http://foo.bar")]
  public class ConcreteFooThree : AbstractFoo
  {

  }

  class Program
  {
    static void Main(string[] args)
    {
      var serializer = new System.Xml.Serialization.XmlSerializer(typeof(AbstractFoo));
      using (var stream = new FileStream("test.txt", FileMode.OpenOrCreate))
      {
        serializer.Serialize(stream, new ConcreteFooOne() { MyProp = 10 });
        stream.Flush();
      }


      using (var stream = new FileStream("test.txt", FileMode.OpenOrCreate))
      {
        var c = serializer.Deserialize(stream);
      }
    }
  }
Concrete subclasses of abstract class as parameters in raw class without abstract methods implementation

Concrete subclasses of abstract class as parameters in raw class without abstract methods implementation


By : aleuluai
Date : March 29 2020, 07:55 AM
Hope this helps The implementations of ImageSingleBand must implement the abstract methods.
The Generics declaration T and II are just declarations, which tell the compiler, that T and II are classes which extend ImageSingleBand. In other words: T and II will be subclasses of ImageSingleBand.
code :
new WrapDetectDescribeSurf<ImageInteger, ImageFloat>();
scala Int class abstract def without concrete implementation

scala Int class abstract def without concrete implementation


By : Ahtsham Ch
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I am checking scala code base. ,
Where can I find the concrete definition of these methods ?
Why can't we autowire an abstract class inside a concrete class in Spring?

Why can't we autowire an abstract class inside a concrete class in Spring?


By : Rohail Ali
Date : March 29 2020, 07:55 AM
may help you . Just forget about the auto wiring, Here you cannot create an object of abstract class by its nature, But if you have at least one of the concrete class which extends this abstract then the spring is capable of auto wiring, In this case spring internally create an instance of concrete class first and then it will auto wire. Since here the abstract class is parent of the concrete class and it is capable of holding its child class objects.
Use type of concrete implementation in abstract base class

Use type of concrete implementation in abstract base class


By : user5287194
Date : March 29 2020, 07:55 AM
With these it helps Just add a new generic parameter in the Exists method. This type will be inferred by the compiler so there is no real impact in usability:
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