Can't even get jar to execute

[IndustrialOne]

C:\Users\Admin>java -jar C:\Users\Admin\Desktop\tesseract4java-0.1.0-windows-x86.jar
Exception in thread "main" java.lang.UnsupportedClassVersionError: de/vorb/tesseract/gui/controller/
TesseractController : 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$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)

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Java Virtual Machine Launcher

A Java Exception has occurred.

OK

Am I using the wrong version of Java or something?

[pvorb]

Which version of Java are you using? To answer this question, open a Terminal and run the command java -version.

[IndustrialOne]

I was using 1.8 but I think I didn't have SDK 1.8 installed on that PC. It's running on this one with Java 1.8.
But I can't seem to load a project. I have pointed the directory with my PNG file but nothing is showing up in the preview or anything that suggests it was loaded.

[pvorb]

I'm closing this issue since the original issue was solved by using the correct JDK version. Please open a new issue with more details on your next problem.