why overriding a variable is not allowed in scala

case 1: override var i to change visibility

It only works when both Test1.i and Test1Scala.i are val, otherwise resulta in a compile error: "variable i cannot override a mutable variable".

package test
class Base1 {
  private[test] var i = 0
}
class Child1Scala extends Base1 {
  override var i = 1
}

This limitation can be bypassed by using java

class Child1Java extends Base1 {
    @Override public int i() {
        return super.i();
    }
    @Override public void i_$eq(int value) {
        super.i_$eq(value);
    }
}

case 2: override var i to add some code for logging

Doesn't work at all, neither var nor val. It always results in a compile error: "super may not be used on variable i". But without super, there methods will become infinite tail call

class Base2 {
  var i = 0
}
class Child2Scala extends Base2 {
  override def i: Int = {
    println("get")
    super.i
  }
  override def i_=(value: Int): Unit = {
    println("set")
    super.i = value
  }
}

Again, it's legal in java

class Child2Java extends Base2 {
    @Override public int i() {
        System.out.println("get i");
        return super.i();
    }
    @Override public void i_$eq(int value) {
        System.out.println("set i");
        super.i_$eq(value);
    }
}