Troubleshooting Unsupported major minor version

Regular Java error

The first time you start a channel/topology on a standalone, you can find the following error:

Exception in thread "main" java.lang.UnsupportedClassVersionError: com/thales/services/cloudomc/punchplatform/admin/ChannelMain : 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)

Reason

The system use a wrong version of Java :

: - jre - older version of java

Solution

On debian/ubuntu devices

Make sure you are using the jdk 8 of the openjdk.

update-alternatives --config java
update-alternatives --config javac

On Centos/Redhat devices

Make sure you are using the jdk 8 of the openjdk.

alternatives --config java
alternatives --config javac