JAVA jdk problem

[bignate170]

Hi, I am having way too much trouble getting java jdk to work on my linux box. I've installed java many times before and never had this problem. I don't know what is going on. I am currently using ubuntu breezy release.. I hope that isn't a problem. I know this is debian. I'm pretty sure ubuntu is somewhat like debian. Here is the info I think you'll need to know......

1) Downloaded jdk-1.5.0-linux.bin from the java.sun.com website.
2) Opened up a terminal and typed:
sh jdk-1.5.0-linux.bin
3) This extracted the file into the current directory. I had the file placed in the directory:
/usr/java
So, the directory of the java jdk is now:
/usr/java/jdk-1.5.0
4) Set the JAVA_HOME variable:
JAVA_HOME=/usr/java/jdk1.5.0
5) Set the PATH variable:
PATH=$JAVA_HOME/bin:$PATH
Also, I exported it....
6) Everything seems to be fine from here. When I do a java -version it detects it fine. So my PATH variable is working fine:
nate@ubuntu:/$ java -version
java version "1.5.0_05"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_05-b05)
Java HotSpot(TM) Client VM (build 1.5.0_05-b05, mixed mode, sharing)

7) Now when I try to compile a program or when I try to extract a jar file I get error messages:
-somtimes this...
Exception in thread "main" java.lang.NoClassDefFoundError:
-somtimes this...
Exception in thread "main" java.lang.NoSuchMethodError: main


I don't get it fellas... It should work, shouldn't it.... I really hope there is something I'm overlooking here. Thanks in advance if there is any way you can help me out... I need to have jdk working and installed on my linux.... Otherwise I need to revert back to windows.... ack....

Thanks,
_nate

[AlexK]

i used to have this problem in suse, turns out I was using int main (String[] args) instead of void main ... (C programmer here)

it could also be due to an improperly installed jdk (similar error when i installed it a loong time ago). Is it possible for you to use apt to get jdk? or java_<version_number>_devel?

Hope this helps a bit.

[bignate170]

Nah, I downloaded the jdk straight from the java.sun.com website.... The only thing I can think of is that ubuntu came with a version of java that I uninstalled... Maybe that somehow screwed somthing up... I don't see how it could have though.

[AlexK]

the download might have been fine, but the way it is installed could have caused some inconsistencies. I downloaded jdk_1.5 from sun like a few months ago and installed it just fine, thing is that it gave similar errors to what you are getting. However, when i uninstalled that and used official SuSE versions (but jdk 1.4, I found SuSE versions of 1.5 a few weeks ago and those installed and worked fine) everything worked perfectly.

I am not sure if jdk is available via apt for debian/ubuntu users, but it most likely will be. So, what i suggest you do now is uninstall the jdk you downloaded from sun and try installing via apt, perhaps it won't give those errors.

just do:

apt search jdk
or
apt search java*devel*

[bignate170]

I've tried to get it from apt and have been unable to locate a package. They offer the open sourced packages but that is not what I need. I did a little google searching and found this:

If you want to install the Java compiler as well as the runtime environment, the easiest thing to do is to [WWW] get it directly from Sun. Take care to use the "Linux self-extracting file" version. Converting the RPM with alien will not work.

Then follow the instructions as set forth on JavaPackageBuildNewVersions to create a .deb file you can install using dpkg.

Do I really need to make a deb out of it? Shouldn't it be alright if I just extract it and such? Thanks for the help btw....

[AlexK]

From google, i this regarding the installation of jdk on ubuntu. Apparaently, the packages are available but on a different apt repository of sorts (from what i can understand).

Again from google is this suggestion on repackaging sun installer for ubuntu.

From googling, it appears that you may need to repackage the installer to *.deb and install that way. Perhaps some other people on these forums who have more experience than I with debian and this matter can be of more help.

Hope this helps.

[bignate170]

Thanks... It's rather pathetic that I need someone else to do my googling for me.. Sorry about that... I guess I was searching too broad of java problems... I didn't think it was a ubuntu specific sort of thing...

I created a .deb package and it now does work... I can compile and run java programs... Only problem is that the -jar option still does not work... I get this...

nate@ubuntu:~$ java -jar /home/nate/Desktop/Azureus2.3.0.4.jar
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/cli/CommandLine

I'll look at some of the following links you provided and do some more ubuntu specific searches for help... I appreciate your help though...

Thanks,
_nate

[liquidnitro9xs]

I have the exact same problem I tried the streamline method
suggested at http://wiki.osuosl.org/display/DEV/Java+on+Debian
and the ubuntu wikki method:


* Grab: http://java.sun.com/j2se/1.5.0/download.jsp
* apt-get install java-package fakeroot
* fakeroot make-jpkg jre-1_5_0_02-linux-i586.bin
* dpkg -i sun-j2re1.5_1.5.0+update02_i386.deb
* logout and login again and check java
* java -version



The first I installed it this way it worked great but when I had to re-install ubuntu again (New Harddrive) went to a java sight to test failed I tried posting on the ubuntu forum. I used the latest JRE Tarball and followed
the instructions.


Liquidheat

[Vergil83]

I don't know if this will work for ubuntu but in debian I just add

deb ftp://ftp.tux.org/java/debian/ sid non-free

to your

/etc/apt/sources.list

then

apt-get update
apt-get install j2re1.4

[burnit]

You haven't set the CLASSPATH enviroment variable, wich is used to locate class files.