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Why is conditionally using an empty panel in Apache Wicket a bad practice?

When Apache released its list of best practices, they recommended avoiding the addition of an empty panel conditionally and gave the following example of what NOT to do: if(MySession.get()....
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Should I use weak entity instead of regular to describe my kind of components?

First time trying to make a E/R model of my database. Trying to understand weak entities and regular entities. Should I make the CPU, RAM, Mainboard, etc. entities weak instead of regular?
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Automated data processing in BPMN/BPEL?

In order to run complex simulations, I need to do preprocessing of data from various data sources. This is done by a bunch of Postgresql scripts. However, having only these is unsatisfactory, because ...
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103 views

What's the accepted way of communication between two model objects in MVC?

I have a model object that fetches data through an URL connection, and another model object that stores and parses it. Eventually when the data is ready, a key-value observing notification is ...