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I will attach call stack. It happens on Nimbus L&F when Properties view is opened. Reason is that we set custom UI class extending from BasicSplitPaneUI. Our subclass calls BasicSplitPaneUI.installDefaults() (by super.installDefaults()). And this code relay on property UIManager.get("SplitPane.dividerSize") but it is not set on Nimbus. Fix is probably not use our custom UI on Nimbus. I must check how it will look like.
Created attachment 60661 [details] NPE when opening Proeperties view
Fixed a991b363c381
*** Issue 118059 has been marked as a duplicate of this issue. ***
Integrated into 'main-golden', available in NB_Trunk_Production #165 build Changeset: http://hg.netbeans.org/main/rev/a991b363c381 User: Marek Slama <mslama@netbeans.org> Log: #133852: Do not set our custom UI for JSplitPane on Nimbus L&F.