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Product Version: NetBeans IDE Dev (Build 201607270002) Java: 1.8.0_102; Java HotSpot(TM) 64-Bit Server VM 25.102-b14 Steps to reproduce: Open java file in editor. Press Ctrl and hover mouse over some class declaration (ex. new JMenuBar();) to get javadoc popup window. In javadoc window select fcn class name (e.g javax.swing.JMenuBar) Paste it to editor; Editor highlights this text as erroneous with message: illegal character: '\u200b' This character is invisible character after each dot in inserted line