Destruction of POPObjects passed as parameters is too extreme

[BeatWolf]

When passing a POPObject as a parameter it is disconnected at the end of the method.
This can be avoided by calling makePermanent() on the POPObject, which is done automatically if the javaagent detects that the object is assigned to any variable.

The problem is that this does not work when the object is for example put into a map or list and used at a later moment from a different method. At this point the object is disconnected.

It also throws a hard to understand nullpointer exception which should give a clearer error message