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we created a TabbedContainer that uses the type editor. within that TabbedContainer we set a ComponentConverter. the ComponentConverter converts a business object of our into a Component that displays the data of the business object. everything works fine until we tried to change the size of the TopComponent that contained the TabbedContainer. java.lang.NullPointerException at org.netbeans.swing.tabcontrol.plaf.BasicScrollingTabDisplayerUI.getMinimumSize(BasicScrollingTabDisplayerUI.java:399) at org.netbeans.swing.tabcontrol.TabDisplayer.getMinimumSize(TabDisplayer.java:397) at java.awt.BorderLayout.minimumLayoutSize(BorderLayout.java:651) at java.awt.Container.minimumSize(Container.java:1651) at java.awt.Container.getMinimumSize(Container.java:1636) ... looking into the sources the exception indicated we learned that the minimumSize of a TabData is determined by getting the minimumSize of tabData.getComponent(). it is our understanding that if a ComponentConverter is used the restriction to supply a Component to the property userObject of TabData is lifted to make lazy instatiation of that instances component possible. The problem in that is that TabData does not know anything about that ComponentConverter. said exception indicated one place where that is problematic. Determining the minimumSize of BasicScrollingTabDisplayerUI is done by returning TabData.getComponent().getMinimumSize() which with the use of a ComponentConverter is not required to be an instance of Component and as such returns null.
Created attachment 86649 [details] stacktrace of NPE in BasicScrollingTabDisplayerUI.getMinimumSize
not a P1 issue, pls see http://qa.netbeans.org/bugzilla/bug_priority_guidelines.html a hot fix is to use some default minimum size when TabData.getComponent(), anything else will need an API change i'm afraid
fixed core-main 46f3b22dc4a4
while i have to agree the the reason for the NPE is fixed any required minimum sizes of the converted userObject of a TabData is still ignored. that however is a matter for a different issue (see http://www.netbeans.org/issues/show_bug.cgi?id=171385).
Integrated into 'main-golden', will be available in build *200909032054* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-golden/rev/46f3b22dc4a4 User: S. Aubrecht <saubrecht@netbeans.org> Log: #170897 - NPE