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Bug 271462

Summary:	URLDisplayer is casted to NbURLDisplayer without any check
Product:	utilities	Reporter:	scanti <scanti>
Component:	URL	Assignee:	Jaroslav Havlin <jhavlin>
Status:	NEW ---
Severity:	normal
Priority:	P3
Version:	8.2
Hardware:	PC
OS:	All
Issue Type:	DEFECT	Exception Reporter:

Description scanti 2017-09-12 09:37:08 UTC

Inside o.n.core/src/org/netbeans/core/NbURLDisplayer.java at line 213 there is this code: 

((NbURLDisplayer) URLDisplayer.getDefault()).htmlViewer = null;

In our RCP application, we had to implement our own URLDisplayer, then a user of ours reported a ClassCastException because of the aforementioned code. 

I think you should add a method like reset() to URLDisplayer instead of doing the cast.