#36 Exception in thread "main" java.lang.UnsupportedClassVersionError

[Joe Cursons]

I just upgraded to VANTED v2.2 and it is not loading - the error output is:

C:\Program Files (x86)\VANTED>starter.cmd
hello world
physical memory 16335
vanted memory 8167
Exception in thread "main" java.lang.UnsupportedClassVersionError: de/ipk_gaters
leben/ag_nw/graffiti/plugins/gui/webstart/Main : Unsupported major.minor version
51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class: de.ipk_gatersleben.ag_nw.graffiti.plugins.gui.web
start.Main. Program will exit.

If I open the .jar file without the starter.cmd batch file, then it will open and I get a "Low memory configuration detected!" warning.

If I try and run the .jar file from command line, with or without a -Xmx command to increase memory, I get the same error as above.

Please feel free to contact me if any further information is required - joseph.cursons@unimelb.edu.au

Thanks,
Joe

[Matthias Klapperstück]

Hello Joe,

please upgrade your JAVA version to at least 1.7.
We dropped support for Java < 1.6

Cheers
Matthias

On 27 January 2015 at 17:27, Joe Cursons jcursons@users.sf.net wrote:

---

• [bugs:#36] http://sourceforge.net/p/vanted/bugs/36 Exception in thread
  "main" java.lang.UnsupportedClassVersionError*

Status: open
Group: CVS Code
Created: Tue Jan 27, 2015 06:27 AM UTC by Joe Cursons
Last Updated: Tue Jan 27, 2015 06:27 AM UTC
Owner: nobody

I just upgraded to VANTED v2.2 and it is not loading - the error output is:

C:\Program Files (x86)\VANTED>starter.cmd
hello world
physical memory 16335
vanted memory 8167
Exception in thread "main" java.lang.UnsupportedClassVersionError:
de/ipk_gaters
leben/ag_nw/graffiti/plugins/gui/webstart/Main : Unsupported major.minor
version
51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class:
de.ipk_gatersleben.ag_nw.graffiti.plugins.gui.web
start.Main. Program will exit.

If I open the .jar file without the starter.cmd batch file, then it will
open and I get a "Low memory configuration detected!" warning.

If I try and run the .jar file from command line, with or without a -Xmx
command to increase memory, I get the same error as above.

Please feel free to contact me if any further information is required -
joseph.cursons@unimelb.edu.au

Thanks,
Joe

---

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--
Matthias Klapperstueck
Faculty of Information Technology
Monash University, Clayton, Australia
Office: Rm 318.6, Building 82, Clayton Campus

[Joe Cursons]

OK, that was an easy fix – thanks for the information.

If you’re at all interested, the startup script is causing a crash (by assigning too much memory – see below) but if I run it manually with 1024 MB then it runs fine.

C:\Program Files (x86)\VANTED>starter.cmd
hello world
physical memory 16335
vanted memory 8167
Invalid maximum heap size: -Xmx8167m
The specified size exceeds the maximum representable size.
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

C:\Program Files (x86)\VANTED>java -jar -Xmx1024m vanted.jar
Welcome! About to start the application...
Trying to load Add-ons...
Add-on sbgn-ed.jar processed
Add-ons loaded in 170ms
Task null finished after 5 sec.