I figured it out.
For who is interested:
The first getPage().addOrReplace replaced the middlepanel which was also
the current changepasswordpanel.
The second call on getParent() can only yield null because the panel in
question was already swapped.
So there are two valid solutions:
first use the var-arg:
getPage().addOrReplace( new MiddleInfoPanel("middle"),new
LoginPanel("right"));
second, swap first the right panel, then the middle panel
getPage().addOrReplace(new LoginPanel("right"));
getPage().addOrReplace(new MiddleInfoPanel("middle"));
both solutions works and my faith in wicket is saved
silly me
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