Unsupported major.minor version 48.0
hi all,
I'm new to java programming and trying fix jedit in my ubuntu box, but it seems my efforts are going ... fultile.
First my config -
neo@tathagata:~$ java -version
java version "1.5.0_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode, sharing)
now when I issue the command jedit I get
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/gjt/sp/jedit/jEdit (Unsupported major.minor version 48.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:488)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:106)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:243)
at java.net.URLClassLoader.access$100(URLClassLoader.java:51)
at java.net.URLClassLoader$1.run(URLClassLoader.java:190)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:183)
at java.lang.ClassLoader.loadClass(ClassLoader.java:294)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:288)
at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:310)
can the version of jdk I'm using create any problem?
When I'm saying JAVA 2 version 1.4 I'm refering to the VM .. right? so should jdk be a concern?
I'm new to java ...and if things dont get fixed I would need to go back to windows leaving ubuntu ... please help
Thanks in advance..
My understanding of the "Unsupported major.minor version" error is that
you are trying to use a class file compiled with a newer Java version
than your JVM. The strange thing is that 1.5 (by whatever name) is
version 49. So it looks like you have a 1.4 class file, and are running it
with a VM that's older than that.
Check that you are launching jedit with the new VM. (Mine is
/var/local/jdk1.5.0_05/bin/java). You talk about issuing "the command
jedit", so it sounds like there is a script running somewhere. It may
be using another VM.
I'm going to download jedit now - I'll let you know what happens.
Good news and bad news. The good news (for me): I have JEdit installed
and running nicely. The bad news (for you): I have JEdit installed and
running nicely.
There are a few points where my set up may differ from yours.
(0) I use Eclipse, not JEdit.
(1) I downloaded and ran the generic *nix installer .jar, not the Debian
package, chosing the following (default) options:Install program in /usr/local/share/jedit/4.2
Install shortcut in /usr/local/bin
Install manual page in /usr/local/man/man1
(2) I have no java related environment variables
(3) The script that runs when I enter the jedit command is:#!/bin/sh
# Java heap size, in megabytes
JAVA_HEAP_SIZE=32
DEFAULT_JAVA_HOME="/usr/local/jdk1.5.0_05/jre"
if [ "$JAVA_HOME" = "" ]; then
JAVA_HOME="$DEFAULT_JAVA_HOME"
fi
exec "$JAVA_HOME/bin/java" -mx${JAVA_HEAP_SIZE}m ${JEDIT} -jar "/usr/local/share/jedit/4.2/jedit.jar" $@
The lines to note are DEFAULT_JAVA_HOME= which points to the VM I
am using, and JAVA_HOME which is empty.
You might want to check these out (in reverse order). As I said before,
the error seems to indicate that the VM you are using to execute
jedit.jar is not the one reported by java -version.
Also the -log switch will verify the java environment you are using:pbrockway@linuxltbr:~$ jedit -log=1
[message] Log: When reporting bugs, please include the following information:
[message] Log: java.version=1.5.0_05
[message] Log: java.vm.version=1.5.0_05-b05
[message] Log: java.runtime.version=1.5.0_05-b05
[message] Log: java.vendor=Sun Microsystems Inc.
[message] Log: java.compiler=null
[message] Log: os.name=Linux
[message] Log: os.version=2.6.12-9-386
[message] Log: os.arch=i386
[message] Log: user.home=/home/pbrockway
[message] Log: java.home=/usr/local/jdk1.5.0_05/jre
[message] Log: java.class.path=/usr/local/share/jedit/4.2/jedit.jar
[notice] jEdit: jEdit version 4.2final
I'm soooooooooooo much grateful that I feel like giving away all my duke dollars to you ...
but I have only twenty ... and I'm not gonna offer such an insignificant amount ....
Jedit is running ...what I did was ..
I had installed jdk1.5.0_06 with net beans ...so I had a jdk1.5.0_06 already ...
I just changed the $PATH to point to its loaction ..and I have my JAVA_HOME where also I did the same thing ...and jedit now is running ...
I can get back to coding now and remain in ubuntu at the same time ...
aaaahhhh ... thank you soo much once again...
it would not have been possible without your help ...
> I just changed the $PATH to point to its loaction ..and I have my
> JAVA_HOME where also I did the same thing ...and jedit now is
> running ...
Good news! PATH is useful for running the Java tools from the
command line, but JEdit seems to rely on the setting for JAVA_HOME.
> thank you soo much once again...
You're welcome.
master ....
I'm already a fan of yours and may I be your trainee ...
please can you guide me where to start from learning java?..any specific book or tute on the web? I have started reading core java vol 1 ... and it appears pretty nice ..
Are you in orkut or any social network? may I have your blog address?
I would be proud to have you in scoopal.com ... you have any mailid that you can write publicly in the forum (I would only invite (plain text) you, fear no spams) ...
Sun's Tutorial (http://java.sun.com/docs/books/tutorial/) does an
extremely good job of introducing the language: it manages to
balance the need for conceptual overviews with lots of code examples
which are necessary given the huge number of classes involved.
Beyond that, it's a question of choosing a project that's interesting or
useful for you and writing some code! You'll find any number of people
here who are willing to help with comments and suggestions. (And, of
course you should offer your own).
I don't give out mail id's here. I hope your not offended by that. To be
honest, I prefer the anonymity of the forum. Talk of "social networks"
and "blog addresses" makes me feel old! I had to ask wikipedia who
or what orkut was! Real flesh and blood people are the thing - but I
guess you know that.
Good luck with your programming and your study. Cheers,
Peter
