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StackOverflowError when calling super in override dispatch method [message #1782864]

Fri, 02 March 2018 16:26

Jürgen ing

Messages: 8
Registered: July 2009

Junior Member

Hi,

I have two classes. Class B extends class A like this:

class A {
  def dispatch String doA(Object a) {}
  def dispatch String doA(String a) {}
}

class B extends A {
  override dispatch String doA(String a) {
    if (a.isEmpty)
      "empty"
    else
      super.doA(a)
  }
}

When I call new B().doA("123") I get an StackOverflowError. I just want to extend the behavior of doA in B and delegate the default to the super class. Any idea how to solve this?

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Re: StackOverflowError when calling super in override dispatch method [message #1782866 is a reply to message #1782864]

Fri, 02 March 2018 16:34

Christian Dietrich

Messages: 14716
Registered: July 2009

Senior Member

you can override a single dispatch case like

class B extends A {
  override dispatch String doA(String a) {
    if (a.isEmpty)
      "empty"
    else
      super._doA(a)
  }
}

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: StackOverflowError when calling super in override dispatch method [message #1783339 is a reply to message #1782866]

Mon, 12 March 2018 08:40

Jürgen ing

Messages: 8
Registered: July 2009

Junior Member

This solved my problem. Thank you.

One question. Calling super.doA(a) in a override dispatch method is always an error?

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Re: StackOverflowError when calling super in override dispatch method [message #1783340 is a reply to message #1783339]

Mon, 12 March 2018 08:50

Christian Dietrich

Messages: 14716
Registered: July 2009

Senior Member

calling super in general not, calling on the same parameter likely

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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