Re: the red component mistery

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#1182

From: Tor Iver Wilhelmsen (TeamB)
Date: Fri, 30 Jan 2004 07:41

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Paul Furbacher <pfurbacher@mac.com> writes:

> The JBuilder Help discussion on "red beans"
> indicates why this happens: the Designer
> cannot instantiate a class which does not
> have a no-parameter constructor.

For completeness' sake I'd also like to mention the two other cases
where it can happen:

1) When the no-arg constructor throws an exception. To overcome this
   you often need to surround code that's only relevant at run-time
   with

	if (!java.beans.Beans.isDesignTime()) {
		// ...
	}

2) When the component extends an abstract class. The solution is to
   declare a "proxy" concrete class for the designer.

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Subject: Re: the red component mistery
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From: tor.wilhelmsen@ergo.no (Tor Iver Wilhelmsen (TeamB))
Date: 30 Jan 2004 08:41:36 +0100
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