Re: Using java in FC1(with eclipse)-help needed

On 03/17/2004 01:03 AM, Kaustubh Ghosh wrote:

On Wednesday 17 March 2004 12:51 am, Matt Morgan wrote:

On 03/16/2004 01:53 PM, Kaustubh Ghosh wrote:

I am quite novice towards java programming in linux.To start with I
installed j2re1.4.2_03 and also j2sdk1.4.2_04 in FC1(Both from
java.sin.com).Now peculiar problems arise.
When I type "java -version" it gives 1.3.1(

That's a path issue. You must also have the older version of java
installed, and it appears earlier (or exclusively) in your path. At a
shell prompt, type

which java

It gives:" /usr/bin/java".I then cut out the java file and ran the command again it gave:"/usr/java/j2sdk1.4.2_04/bin/java".I again replaced the java file and on again issueing the command it gave:"/usr/bin/java".

Do you understand how $PATH works? Forgive me if this is too newbie for you. When you type 'java' at a prompt, the shell looks through the directories in your $PATH, in order, for a program called java. When there's one in /usr/bin, it runs that one. When there isn't one in /usr/bin, it proceeds through the $PATH until it finds one, or gives up. Since the 1.4.2 version is also in your $PATH, the shell runs that one when it can't find any other ones first.

Basically you have two javas installed. One of them is either the program itself, or a link to the program, in /usr/bin. That one is the 1.3.1 version. The version you want is exactly where you think it is. Probably you can get what you want to work by simply moving or deleting the one in /usr/bin, although that may leave that version present somewhere on your computer and confuse you later. You should also follow the instructions regarding setting $JAVA_HOME in the other related messages on this topic. That will help you make sure you're always running the version you want to be running.

and you'll see where that version is (it'll be the first one that comes
up, if more than one comes up). You can also type

echo $PATH

to see what directories are in your path. You can easily add the

It showed:
"/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin:/usr/java/j2sdk1.4.2_04/bin:.:/usr/java/j2sdk1.4.2_03/bin:/root/bin"
Now what can I do.

This is fine. You should leave your $PATH alone, in my opinion, and continue with fixing $JAVA_HOME.

--Matt