CODEWITHSUNDEEP
javawindowsubuntutestingjar
badarshahzad
badarshahzad

Reputation: 1297

Issue with running JAR in Windows, works fine in Ubuntu

I am stuck on the following error. I don't know what type of error it is. What should I do?

C:\Users\shehzad\Desktop\Software>java -jar Untitled.jar Exception in thread "main" java.lang.UnsupportedClassVersionError: FrontEnd/MainWindow : Unsupported major.minor version 52.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(Unknown Source) at java.security.SecureClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.access$100(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Unknown Source) at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:56)

Scenario is: I developed software that works fine in Ubuntu 14.04 Lts. It's JAR also works in Ubuntu, but when I tried this JAR in Windows 7 it shows the above error.

Ubuntu Java version: 1.8.0_101

Windows Java version: 1.7.0_79

Upvotes: 1

Views: 221

Answers (2)

Fairoz
Fairoz

Reputation: 1666

Your jar file is compiled using 8u101 (major.minor version 52.0) and your trying to run on 7u79. Hence you end up in Unsupported major.minor version 52.0.upgrade your java to 8u101.

Upvotes: 0

eckes
eckes

Reputation: 10423

class version 52.0 means it requires Java 8 to run. You should for security reasons update your Windows Java anyway, so its time to go to Java 8. If you need Java 7 for something you can keep it as a private installation, but make sure the "javapath" as configured by the registry points to Java 8.

You can also start in a command window or via explorer link the right Java.exe without installing it as public version like this:

"c:\Program Files\java\jdk_1.8.0_102\bin\javaw.exe" -jar app.jar

Upvotes: 1

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