Scala inheritance from Java class with generic types in constructor

Question

How can I extends a Java class that expects a Map<?, ?> in its constructor in Scala?

The Java class looks like

public class MyJavaClass {

  private final Map<String, ?> originals;

  public MyJavaClass(Map<?, ?> originals,  Map<String, ?> configProviderProps, boolean doLog) { ... }

  public MyJavaClass(Map<?, ?> originals) {
    this(originals, Collections.emptyMap(), true);
  }
}

In Scala I was trying to do something like below but my IDE tells my that it "cannot resolve overloaded Constructor":

class myScalaClass[K <: AnyRef, V <: AnyRef](origi: Map[K, V]) extends MyJavaClass(origi) { ... }

Also tried to replace AnyRef with java.lang.Object without success. I am using Java 8 and Scala 2.12.11.

Would wildcards work for you or do you have to know the types K and V? Also, I don't think you need an upper bound at all — user
– user, Commented May 24, 2020 at 18:56

Dmytro Mitin · Accepted Answer · 2020-05-24 19:06:43Z

3

Try

class myScalaClass(origi: java.util.Map[_, _]) extends MyJavaClass(origi) {  }

answered May 24, 2020 at 19:06

Dmytro Mitin

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