Upgrade from 1.4.1.2 to 1.6.1 fails on Linux

I did what I usually do for an upgrade:

1. Stop the server
2. Delete all files/folders other than library and plugins in the install area
3. Copy all files/folders from 1.6.1

This used to work in the past. Never failed me.

But with 1.6.1, I get:

  Code:

$ Exception in thread "main" java.lang.UnsupportedClassVersionError: org/serviio/MediaServer : Unsupported major.minor version 52.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:803)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)


What happened here?

You also have to upgrade java to version 8

What's the latest version that still works with 1.7 java?