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Solutions on the web

via Google Groups by Raghavendra Talekar, 1 year ago
org/openpnp/Main : Unsupported major.minor version 52.0
via Google Groups by mojalovaa1, 1 year ago
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org/graylog2/bootstrap/Main : Unsupported major.minor version 52.0
java.lang.UnsupportedClassVersionError: org/openpnp/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 com.exe4j.runtime.LauncherEngine.launch(LauncherEngine.java:59)	at com.install4j.runtime.launcher.UnixLauncher.main(UnixLauncher.java:57)