B4J Question jrdc2 on linux server version error

[Rachbob]

my jar file on linux server give me version error. here are logs :

[ *** ]$ java -jar result.jar
Exception in thread "main" java.lang.UnsupportedClassVersionError: anywheresoftware/b4a/BA : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:808)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:443)
at java.net.URLClassLoader.access$100(URLClassLoader.java:65)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.net.URLClassLoader$1.run(URLClassLoader.java:349)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:348)
at java.lang.ClassLoader.loadClass(ClassLoader.java:430)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:326)
at java.lang.ClassLoader.loadClass(ClassLoader.java:363)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2625)
at java.lang.Class.getMethod0(Class.java:2866)
at java.lang.Class.getMethod(Class.java:1676)
at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:494)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:486)

java version already installed is :

java version "1.7.0_261"
OpenJDK Runtime Environment (amzn-2.6.22.1.83.amzn1-x86_64 u261-b02)
OpenJDK 64-Bit Server VM (build 24.261-b02, mixed mode)

thank you for any help .

 

[OliverA]

The jRDC2 server was compiled with Java 1.8 (major.minor version 52.0), but your installed version is 1.7. You need 1.8 (or higher) to run your jRDC2 version.