Error after the new Update =(

Kuxii · Dec 4th 2015

Hello i become the Error from the Linux Server After the new Update,

Code

Exception in thread "main" java.lang.UnsupportedClassVersionError: server/Main : Unsupported major.minor version 52.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
        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)
Exception in thread "main" java.lang.UnsupportedClassVersionError: server/Main : Unsupported major.minor version 52.0

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The server is not workin with Java8 Java7 jdk/oracle
Can help me?

red51 · Dec 4th 2015

You need to install Java 8 to solve this issue

Kuxii · Dec 4th 2015

No i become the Error an have java8^^

Code

java version "1.8.0_66"
Java(TM) SE Runtime Environment (build 1.8.0_66-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.66-b17, mixed mode)
root@srv28408:~#

Can closed..!
I have java reconfiguriert and the server worked thanks

DHLF · Dec 7th 2015

The same error happens since the latest update (0.6.3.1),

Code

Exception in thread "main" java.lang.UnsupportedClassVersionError: server/Main : Unsupported major.minor version 52.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
        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)

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however, a quick check (java -version) showed:

Quote

java version "1.7.0_91"
OpenJDK Runtime Environment (IcedTea 2.6.3) (7u91-2.6.3-1~deb8u1)
OpenJDK 64-Bit Server VM (build 24.91-b01, mixed mode)

Just to get this right: the support of java7 has ended with the latest update, therefore to get the servers back online I HAVE to install java8?

DHLF · Dec 7th 2015

Just for your info:
Using Debian is sometimes.. different, as "they" keep older stable versions,
so an ordinary apt-cache search openjdk will never show you a newer version..

1) add the following line at the end of /etc/apt/sources.list
deb http://http.debian.net/debian jessie-backports main
Be warned.. from this moment on your system will accept BACKPORTS! (not backdoors )
2) run apt-get update
3) run apt-get install openjdk-8-jre-headless
(headless means WITHOUT GUI, so much smaller)

A quick apt-get remove openjdk-7-jre-headless removes the "old" java7.

This changed my system to:

Quote

openjdk version "1.8.0_66-internal"
OpenJDK Runtime Environment (build 1.8.0_66-internal-b17)
OpenJDK 64-Bit Server VM (build 25.66-b17, mixed mode)

But alas! When I tried to start rising world there appeared even more errors in the log file!!
After a reboot everything went back working fine

Thanks to https://github.com/OpenTreeOfL…tes:-jessie-and-openjdk-8

Participate now!