– what exactly I should install

There is no JAR to download or anything extra to install, the classes are part of the JDK on Mac OS X. In Apple Java 6 JDKs they live in Contents/Classes/ui.jar under the JDK bundle (e.g. /System/Library/Java/JavaVirtualMachines/1.6.0.jdk or /Library/Java/JavaVirtualMachines/1.6.0_37-b06-434.jdk), on Oracle Java 7 they are in lib/rt.jar under the JRE home directory (/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home or /Library/Java/JavaVirtualMachines/jdk1.7.0*.jdk/Contents/Home/jre).

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