Having trouble compiling/running java on linux

nejiron · 11-09-2003, 06:18 PM

I installed all the sdk's and what not, but I am still having trouble running my java programs on linux.

I get the error

Exception in thread "main" java.lang.NoClassDefFoundError: MyOS

on all my files, MyOS being the name of the class where main is located.

It works on my windows machine, or if I use telnet to connect to a unix server to run it.

If anyone has any idea what may be wrong I would appreciate the help.

thanks

hw-tph · 11-09-2003, 07:16 PM

You might have conflicting packages installed. I have had a lot of problems running Sun java (j2se javac and java) when I had gcj installed. If that's the case you should note some non-Sun java classes mentioned in the error message.

Håkan

MiscGeek · 11-09-2003, 07:48 PM

Yep, I've ran into the same thing with gcj and Sun's JDK. The only way I've found to completely solve the problem is to remove gcj.

nejiron · 11-09-2003, 08:55 PM

How do I check if gjk is installed, I don't remember adding it, so I don't think it is.

I know that Suns sdk is though.

Also, how would I remove it if it is installed.

thanks

MiscGeek · 11-09-2003, 09:26 PM

If you have a rpm based distro you should be able to run rpm -q gcj. If it's installed you can remove it by running rpm -e gcj.

nejiron · 11-09-2003, 09:41 PM

nope, its not installed

i have j2re installed along with the j2sdk

does that matter?

nejiron · 11-10-2003, 01:42 PM

anyone have any other suggestions

when I do echo $PATH
this is what I get:

/usr/local/bin:/usr/bin:/bin:/usr/X11R6/bin:/user/java/j2sdk1.4.2_02/bin:/home/joe/bin:/usr/java/j2sdk1.4.2_02/bin

hw-tph · 11-10-2003, 03:15 PM

It would be helpful if you could provide the full error message...

Håkan

nejiron · 11-10-2003, 03:21 PM

this is the full error:

Exception in thread "main" java.lang.NoClassDefFoundError: (name of class goes here)

MiscGeek · 11-10-2003, 09:48 PM

Hmm.., okay what is your classpath set to? Because, that's the only other thing that I can think of. Somehow it's not finding your class.

nejiron · 11-10-2003, 11:53 PM

/usr/java/j2sdk1.4.2_02/lib

is the classpath

MiscGeek · 11-11-2003, 12:22 AM

Okay, that is probably your problem. You need to include the directory or jar file that contains the class you are trying to run.

i.e java -cp ~/java/<DirName> MyClass

nejiron · 11-11-2003, 01:38 AM

thank you so much, finally got it to work

all i had to add was the -cp ./