Convert .jar to an OSX executable?

Yes, on Mac OS X there is a program called Jar Bundler that is installed when you install the free (assuming that you already own a copy of Mac OS X) Xcode Developer Tools that allows you to bundle a JAR file inside a native Mac OS X “*.app” application bundle with a nice and shiny icon just like other apps.

Update
The JAR bundler doesn’t exist on later versions of OS X. As a workaround, you can manually create an OS X project that invokes Java. Or, there are a variety of build system extensions that do a similar thing; for example, the gradle-macappbundle plugin for Gradle will create such a wrapper app.

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