Jul 17, 2016 A random program that I installed reset the default application (Java) for.jar files on my Macbook, and to reset the behaviour in Mac OSX took a bit more work than I thought. Turns out the “Java Launcher” isn’t in the list of applications that you can select from, in the “Open With” list. Launcher by Odology lets you search and launch any app on your Mac as you type. Launcher also lets you switch between apps, so there’s no need to check if the app is already running, just type and go. Jar Launcher is the program in Mac OS X that launches Java JAR files into the Aqua/Java runtime environment when the JAR file is double clicked. Jar Launcher also launches a class in the same manner. Jar Launcher does not execute the Java files itself, rather it passes them to the Java Virtual Machine (JVM) with any appropriate parameters.
Active1 year, 3 months ago
I have been trying to open a JAR file on my Mac with no success. It says the JAR file could not be opened and asks me to look for any error messages in my console. Here are the console messages. I suspect the prob is in the first line itself, but I am not from a software background, so don't know if this is enough for anyone who knows Java to tell what the issue is. I did update my software, so I am assuming I have the latest version of Java although I don't know how to 100% ensure that - the Java.com website just told me to update the overall software on my Mac and said that will take care of Java's latest version also. Please help!
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rajats9999
5 Answers
The above exception is thrown when a JVM encounters an unsupported class version. This occurs when the JVM encounters a class built for a later JVM. So you need to upgrade your VM, then change your default Java.
Here's how to change your default:
Type 'java preferences' into Spotlight. You'll see the 'Java Preferences' utility. Run that, and you can change the default Java instance to what you require (probably Java 6).
EDIT: That utility is in Application/Utilities/Java. Using Spotlight seems an easier way to find it though!
Brian AgnewBrian Agnew237k3434 gold badges295295 silver badges407407 bronze badges
I'm guessing that the JAR requires Java 6; most Macs only have Java 5 installed.
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UnsupportedClassVersionError
- there's your culprit. The class file was generated on a later version of the JDK than the JRE you're trying to run it on.670k186186 gold badges13371337 silver badges17271727 bronze badges
Install Jar Launcher Mac
Currently Macs ship with have Java 1.5. Java 1.6 can be downloaded for 64 bit Intel Macs here: http://support.apple.com/downloads/Java_for_Mac_OS_X_10_5_Update_1. From http://support.apple.com/kb/HT1856:
This release does not change the default version of Java. This release is only for Mac OS X 10.5.2 and later, and should not be installed on earlier versions of Mac OS X. This release is for 64-bit, Intel-based Macs only and cannot run on PowerPC-based or 32-bit Intel-based Macs.
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Java Jar Launcher Download Mac
Just right click the .jar file and open with archive utility. Simple. Location of archive utility:
/System/Library/CoreServices/Archive Utility.app
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