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Created attachment 157645 [details] screenshot of Pallete There is no JSlider component in component pallete. Netbeans 8.1, Java SE bundle, OS X, Japanese version I download it from https://netbeans.org/downloads/index.html I am using OS X yosemite. See screenshot for details. JSlider exists in Windows version of Netbeans 8.1
reset the pallete solves the problem. very sorry.