Ask Different is a question and answer site for power users of Apple hardware and software. It only takes a minute to sign up. If it's responding with No Java runtime present, requesting install. I believe that Apple's default installer still installs Java 6; I'd recommend getting the latest version right now Java 8u from here. With Java 8, java -v fails with Unrecognized option: -v.
Use java -version instead. If you have a Java icon in System Preferences, it's highly likely that Java is installed on the Mac:. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. How can I check if Java is installed on my Mac?
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Ask Question. Asked 1 year, 11 months ago. Active 1 year, 11 months ago. Viewed 3k times. I have gone into Terminal and typed java -v for which it responds with No Java runtime present, requesting install. This opens up other environments too, such as IBM mainframes and Unix. The popular phrase, in the early days of Java was "write once, run anywhere". But, it all went wrong, well before security flaws became the main Java story.
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As it played out over the years, Flash beat out Java in the marketplace on the client side your computer. Flash served the same cross platform needs that Java was intended for. There were annoying differences between Java runtimes from different vendors which led to the sarcastic phrase "write once, debug everywhere. On the server side however, Java has always been popular. The Java Runtime Environment doesn't really care about, or deal with, the Java programming language, it takes Java bytecode as input. This, along with assorted advantages to using a JVM, has led to other programming languages also being translated into Java bytecode so that they can be run in a Java Virtual Machine.
In Sept. Wired reported that Twitter runs entirely inside JVMs mostly using software written in Scala but also some written in Java.
Now that security flaws are the big issue with Java, the safest best practice is to un-install Java and see if anything breaks. I say this because, as far as I know, there is no inventory function that reports on Java usage system-wide. Since all the security issues have been with Java applets embedded in web pages, someone that only needs Java for installed applications, should disable its use in all browsers using a security feature first introduced in Java 7 Update 10 see Oracle"s instructions. Someone needing to run Java applets should normally use a web browser that has Java disabled and use a second browser, with Java enabled, exclusively on the site s that need Java.
If you are not sure which sites use Java, Google's Chrome browser is your friend, as it warns before running Java applets. The Version page of this site verifies that a browser is capable of running Java applets in web pages by running a very simple applet that displays the version of Java. It also has a history of Java releases and instructions for disabling Java in assorted browsers. The source code for the applet is on the About page.
Java applets can, optionally, be digitally signed. Those that are not, started generating a new pop-up warning with the introduction of Java 7 Update The "version" applet on this site is not signed.
Neither are those from Oracle that test if Java is working here and here. Finally, you may see Oracle mention the Java security baseline. This refers to the latest version of Java that contains no security flaws. This is not necessarily the latest version. There is a different security baseline edition for Java 6 and 7. To illustrate, as of mid-January , Update 37 was the security baseline edition for Java 6. Windows users had access to Update 38 which contained bug fixes, but no security related bug fixes.
Apple did not produce an Update 38 for the Mac, they maxed out at Update In April , Ed Bott adressed this by listing some applications and websites that require Java. See How big a security risk is Java? Can you really quit using it? Java is included in their app.
Java is also used for the SET and Sudoku puzzles.
How to Check if Java is Installed
Not, however, with Chrome. I have read many comments about banks in Europe that require Java on their websites. ProjectLibre is an open source replacement of Microsoft Project Sharefile.
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Game sites pogo. On the Oct 16, edition of Security Now he said that he was forced to use a Java based chat program to deal with Comcast when he moved. LuxSci webmail only for some advanced features Libre Office uses Java for some functions but functions fine without it. On the other hand are web sites that have walked away from Java: The time.
Java Tester - Home Page
Minecraft used to require Java but no more. It now ships with its own embedded instance of Java. In the beginning, Java programs embedded in web pages were called applets. That's the term I use on this site because it was created long ago. Now however, things are more complicated.
How to check for and disable Java in OS X
According to Oracle , Java programs running inside a browser "includes plugin applets, Java Web Start applications, embedded JavaFX applications, and access to the native deployment toolkit plugins". Windows users may find the term applet used to describe the small applications in the Control Panel Power Options, Mouse options, Administrative Tools, etc. These control panel thingies have nothing to do with Java, other than the Java one, which is referred to as the Java Control Panel.
Java applets can be digitally signed.