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This issue was reported manually by alexvsimon. It already has 1 duplicates Build: NetBeans IDE 8.0 Beta (Build 201401141042) VM: Java HotSpot(TM) 64-Bit Server VM, 24.45-b08, Java(TM) SE Runtime Environment, 1.7.0_45-b18 OS: Linux User Comments: GUEST: Was launching the IDE. Stacktrace: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.awt.Color at javax.swing.plaf.nimbus.NimbusStyle.getColorForState(NimbusStyle.java:558) at javax.swing.plaf.synth.SynthStyle.installDefaults(SynthStyle.java:937) at javax.swing.plaf.nimbus.NimbusStyle.installDefaults(NimbusStyle.java:231) at javax.swing.plaf.synth.SynthStyle.installDefaults(SynthStyle.java:916) at javax.swing.plaf.synth.SynthLookAndFeel.updateStyle(SynthLookAndFeel.java:265) at javax.swing.plaf.synth.SynthScrollBarUI.updateStyle(SynthScrollBarUI.java:80)
Created attachment 144885 [details] stacktrace
it's JDK issue