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This occurs on build 200904280201 jdk7b55. At http://wiki.netbeans.org/TS_61_FilesAndProjectsView Test suite: Drag and drop 6. Try forbidden DnD - .class file it is possible to drag and drop .class from jar file to source package.
Reproducible on: Product Version = NetBeans IDE 6.7.1 (Build 200907230233) Operating System = Linux version 2.6.28-15-generic running on i386 Java; VM; Vendor = 1.6.0_16; Java HotSpot(TM) Client VM 14.2-b01; Sun Microsystems Inc. Runtime = Java(TM) SE Runtime Environment 1.6.0_16-b01 Looks like its relatively safe issue > P4.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss