B4J Question [Solved] Can't start jar server

[jalle007]

My app is running fine localy.But when I upload it to server and type

java -jar myserver.jar

I got following error

main._process_globals (java line: 69)
java.lang.UnsupportedClassVersionError: anywheresoftware/b4j/object/ServerWrapper : Unsupported major.minor version 51.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:643)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
        at com.jalle.main._process_globals(main.java:69)
        at com.jalle.main.initializeProcessGlobals(main.java:60)
        at com.jalle.main.main(main.java:27)

What major.minor version 51.0 is causing this issue ?

 

[jalle007]

OK I found what caused this problem. Its that on my local machine I have JDK 1.7.0.51
and on remote its 1.6.0.31.
unfortunately compiling my jar with lower version doesnt work.
i guess minimum for B4J to work is 1.7 , right ?

NOw need to find a way to install java on remote server.

 

[Fabrice La]

May check this like http://stackoverflow.com/questions/10382929/unsupported-major-minor-version-51-0
can help ...

 

[Fabrice La]

What do you have in remote ?
Do we access it using ssh ?

 

[jalle007]

Yes I have shell access using SSH.
Now instaled Java JDK 1.7.0.51 but need to change JAVA path.
Stlll dont know how ...

EDIT: update-alternatives --config java
worked fine