Other [IOT] problem with orangepi

derez · Apr 4, 2016

I try to run a b4j non-ui application using b4j-bridge.
I get this error - "Unsupported major.minor version 52.0" :

Waiting for debugger to connect...
java.lang.UnsupportedClassVersionError: org/eclipse/jetty/server/HttpConfiguration$Customizer : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:792)
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$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:190)
at anywheresoftware.b4a.shell.Shell.getCorrectClassName(Sh
ell.java:504)
at anywheresoftware.b4a.shell.Shell.createObject(Shell.java:491)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:244)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:159)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:93)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:90)
at b4j.example.main.<clinit>(main.java:17)
Exception in thread "main"
java.lang.ExceptionInInitializerError
Caused by: java.lang.RuntimeException: java.lang.UnsupportedClassVersionError: org/eclipse/jetty/server/HttpConfiguration$Customizer : Unsupported major.minor version 52.0
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:114)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:90)
at b4j.example.main.<clinit>(main.java:17)
Caused by: java.lang.UnsupportedClassVersionError: org/eclipse/jetty/server/HttpConfiguration$Customizer : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:792)
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$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:190)
at anywheresoftware.b4a.shell.Shell.getCorrectClassName(Shell.java:504)
at anywheresoftware.b4a.shell.Shell.createObject(Shell.java:491)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:244)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:159)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:93)
... 2 more

The application code is simple:

B4X:

'Non-UI application (console / server application)
#Region  Project Attributes
    #CommandLineArgs:
    #MergeLibraries: True
#End Region

Sub Process_Globals

    Private srvr As Server
End Sub

Sub AppStart (Args() As String)
    Try
        srvr.Initialize("srvr")
        srvr.Port = 53500
        srvr.AddHandler("/reboot", "Reboot", False)
        srvr.AddHandler("/shutdown", "shutdown", False)
        srvr.Start
        Log("Server started")
        StartMessageLoop
    Catch
        Log("Not started !")
    End Try
End Sub

The same problem shows when running directly from the orangepi.
Help ?

billzhan · Apr 4, 2016

Java version mismatch, Java -version

derez · Apr 4, 2016

Thanks, I'll check it.

Erel · Apr 4, 2016

This error means that you are not using Java 8+.

derez · Apr 4, 2016

I have found that I have java 7 in the orangepi.
I have a problem of space so I need to remove it before installing 8.
How do I uninstall java 7 which came in the raspbian ?

derez · Apr 4, 2016

I installed jre 8_45 (like explained in https://www.b4x.com/android/forum/threads/iot-linux-embedded-boards-gettings-started.60430/ ) but the version is still java 7.

root@orangepi:~# java -version
java version "1.7.0_40"
Java(TM) SE Runtime Environment (build 1.7.0_40-b43)
Java HotSpot(TM) Client VM (build 24.0-b56, mixed mode)
root@orangepi:~#

Somewhere the board should know that it has a new jre version under usr, how do I tell it ?

billzhan · Apr 5, 2016

https://www.b4x.com/android/forum/threads/b4j-and-raspberry-pi-2.62123/#post-392102

Or use full path of java

B4X:

sudo  "/full/path/to/java8/java" -jar your.jar

Erel · Apr 5, 2016

Use the full path as @billzhan wrote.

derez · Apr 5, 2016

Looks like the pointer I need, thanks. I'll try it tomorrow.

dar2o3 · Apr 5, 2016

To select the version of java and javac use these commands.

B4X:

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

derez · Apr 5, 2016

I used the instructions in the link above (post 7) and it works, thanks !

Other [IOT] problem with orangepi

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