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This issue was reported manually by prusinek74. It already has 1 duplicates Build: NetBeans IDE Dev (Build 201607270002) VM: Java HotSpot(TM) 64-Bit Server VM, 25.101-b13, Java(TM) SE Runtime Environment, 1.8.0_101-b13 OS: Windows 10 User Comments: prusinek74: New class created using "Implement abstract class" tip from Alt + Enter tip list. Class created, and opened to edit. Then, an error occurred. Stacktrace: java.lang.AssertionError at org.openide.awt.HtmlRendererImpl.reset(HtmlRendererImpl.java:103) at org.openide.awt.HtmlRendererImpl.getTreeCellRendererComponent(HtmlRendererImpl.java:147) at org.openide.explorer.view.NodeRenderer.getTreeCellRendererComponent(NodeRenderer.java:156) at javax.swing.plaf.basic.BasicTreeUI$NodeDimensionsHandler.getNodeDimensions(BasicTreeUI.java:2807) at javax.swing.tree.AbstractLayoutCache.getNodeDimensions(AbstractLayoutCache.java:492) at javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.updatePreferredSize(VariableHeightLayoutCache.java:1360)
Created attachment 161504 [details] stacktrace
ConstructorGenerator: Please do not instantiate UI classes in a non-EQ thread.
(See issue #267461)