where to install java ?
 

To which directory i should install jdk 1.4?

i am both the root and the user .

which directory i should install java ?

suppose, i install jdk1.4 in root. directory.. ..now if i log in as a user "user " will i able to access java ?


similarly, if i install jdk1.4 in "user " directory , will i able to access java when i log in as root ?

i am confused where to install java whether in root directory or in user directory .

any help ?


i also, want to install tomcat too. where do i install that also ?

Install it as root either to /usr/local/ or to /opt/

You will be able to use it as both root and user, no problem.

You can probably get it for your distrobution, which you should supply. Then someone can probably point you to a pre-built package of java for your.

i have installed java . but How do i set the PATH ?

my shell is bash shell.

please tell in steps . i am a newbie.

my java has been installed in directory

/usr/java/jdk1.5.0_04


i am getting difficulty to set the PATH . how to set the PATH ?

i want to compile HelloWorld.java.

please help me.

Regrds
Volcano

>Install it as root either to /usr/local/ or to /opt/

ohh...i have installed in the root ! :cry:

that means other user can not access java ?

Don't panic :)

Everything will be ok. You can set your PATH to the java binaries and all users will be able to use it.

Become root by using su. Then make a link with a nice name to your new installation of java, for example like this:

Then open file /etc/profile as root in a text editor and add this line to the end of the file:

Log out and log in again and you should be able to run javac.

R.

hi,

my my java has been installed in directory

/usr/java/jdk1.5.0_04.



i have some question on your comment.

Question1 :


ln -s /usr/java/jdk1.5.0_04 /usr/local/jdk

but inside /usr/local/ there is no jdk folder ! .....do you mean i should create jdk folder there first before executing your code ? i dont like this name jdk , i want to create a folder java instead of jdk .

and want to run
ln -s /usr/java/jdk1.5.0_04 /usr/local/java

is there any problem ? will i face any problem later on ?


Question 2:



but how do open that file ?

[root@machineroot]#vi /etc/profile ===>this does not work.

i am also surprised that the file has no extenstion ! is it profile.txt ?



Please help, i am a very much newbie.....so please bear with this silly questions.

All i need is to install java.

Regards

1) This command will be fine. Just make sure that you use /usr/local/java not /usr/local/jdk.
What you are doing is creating a Symbolic Link (Shortcut) with a nice name to /usr/java/jdk1.5.0_04. This step is optional, you only need to do it if you want. You are NOT creating a new folder, just a shortcut to an existing one.

2)This does not work. It should do, what error message do you get. Remember that Linux is Case Sensitive - /ETC/PROFILE is not the same as /etc/profile. The correct one is lower case.

It does not have an extension, many files in linux don't have extensions.


I hope this helps, and post back with any further problems
--Ian

Sir, hurrah...it started working !



sir ,if I copy the whole jdk1_5_04 from /usr/java directory and pasted into /usr/local directory will that work ? please tell me.

thank you

Yes, but you would need to change your PATH, as you already have done.

Why bother though? There is no real benefit to be gained from this.

I hope this helps
--Ian

Sir,
if i did not do symbolic link

ln -s /usr/java/jdk1.5.0_04 /usr/local/jdk


but only....

typed export PATH=$PATH:/usr/java/jdk1.5.0_04/bin

does not everybody could access java ?

i guess all user could access java because i am setting the PATH here. there is no need to do symbolic link. is not it ?

but in the first response, somebody told your java could be accessed if you install in/usr/local directory !......its meaningless.what the speciality this folder(/usr/local)posses so that all application software should be available here for accessible to everybody ?

Yes, there is no need for the symbolic link, you can just add the jdk1.5... directory to your path.

Traditionally, programs that you install yourself are installed to /usr/local. There is nothing special about this, except the permissions will allow all users to read or execute files stored there. If you install to a users home, only that user can access the file.

You can also install programs to /usr/lib, or /opt, but /usr/local is normally used for programs you install manually, while /usr/lib is normally used for programs installed by a package manager (rpm, apt-get, etc).

See The File Heirachy Standard for more if you are interested.

I hope this helps
--Ian

thats a very surprising thing to me .

you know i typed


[root@machine root]#rpm -ivh jdk_1_5.....rpm

and my file jdk_1_5... goes into /usr/java/jdk_1_5...... is not it starnge ? IT SHOULD HAVE BEEN GONE TO /usr/local by default as you told . but it did not !



Of couurse, i logged as root and then i downloaded the java and hen installed .


do you suggest i should logged in as a user and then i should use su to be root for installation . if i did that then did my file goes into /usr/local ?

No, no, no.

When you install a program using rpm, it will install to other locations, such as /usr/lib (Or in this case /usr/java). Programs you install yourself (using a bin file, such as firefox) are normally installed to /usr/local. It really doesn't matter though, it is mainly just established practice.

--Ian