On Sun, 9 Feb 2003, Julian Templeman wrote: > OK... now I've got 9.0 working, time to do something with it! > > I need Java on here, so I've downloaded the .bin distribution from > Sun. Since I'm still a Clueless Newbie at this stage, I want advice on > the best place to install it... On a Windows machine I'd just install > it any-dam-where and add the directory to the path. Is this the > recommended way on Linux, or should the Java folder tree live > somewhere in particular? > > Thanks! > > julian > > Templeman Consulting Ltd. > London and North Wales
Hi Julian, The attached howto should get you going in the right direction. I use Java on my system for program development and this is how I've installed JDK on my system. -- Mark "If necessity is the mother of invention, then who's the father?" ----------------------------------------------------------- Paid for by Penguins against modern appliances(R) Linux User Since 1996 Powered by Mandrake Linux 8.2 & 9.0 ICQ# 27816299
Installing JDK from Sun HOWTO Installing Java from Sun, found at http://java.sun.com is an easy task and doesn't need to be, nor should it be seen as a terribly hard thing to do. Here are the steps to take in order to make this happen. OBTAINING THE PACKAGES FOR INSTALLATION: 1. Point your browser to the URL above at the Sun site, download the packages you need. a. if you're a Java developer, or a beginning Java programmer then all you're going to need is the JDK package. http://java.sun.com/j2se/1.4.1/download.html b. if you do have a need for both the JDK and JRE packages you can get both packages from the same place. How to accomplish this will become self-evident once you're there and see how things work. c. if you don't know whether or not you need both, then it's very likely you don't and should just download the JDK package. The links for downloading JDK=(SDK) or JRE are clearly marked and easily and quickly visible. For Linux there are two types of files you can download. Personally I feel the "Linux Self extracting" file is the easiest to work with. You can also download the RPM self extracting file if you want to install JDK/JRE via the RPM method. However, there is a drawback to getting the RPM and doing the install that way. By getting the plain self-extracting package, you, the user have total control as to where it gets installed to. When I explain the actual installation of the package you'll see the more clearly why this method of installation is easier and less work. With the RPM installation you actually have to know more about what needs to be done in order for things to work correctly. INSTALLING THE JDK/JRE PACKAGE: * Ok, assuming your download completed cleanly and successfully its time to start the installation. There isn't anything magical about getting this done. It's a simple and painless process. If you're a Mandrake Linux user and you're currently running version 8.2 or above, then it's likely you've already got a version of Java installed on your system that comes with and installs with the system. This Java system will perform most things adequately enough for small tasks. However, it is limited in scope and functionality which is why you're probably reading this HOWTO right now. This is not to knock Mandrake or their preparaion of the system, but merely to mention that the Java version that ships with Mandrake 8.2 and above is limited and can't do the things that Sun's package can and does. NOTE: In order to know for certain what version of Java may, or may not exist on your system issue this command to find out from the system what is installed on it: java -version You'll get one of three back from the system. 1. if it's a stock Mandrake install you'll see this returned to the terminal; Kaffe Virtual Machine Copyright (c) 1996-2000 Transvirtual Technologies, Inc. All rights reserved Engine: Just-in-time v3 Version: 1.0.6 Java Version: 1.1 (again, for RedHat machines or other distros you can try this, but I'm not sure exactly what you'll get returned to the terminal. If you get something similar then the steps below will work for you as well. this method has been done successfully on both RedHat 8.0, Mandrake 8.2 and 9.0 systems.) 2. If JDK is already installed on your system "correctly" then this will be your system's response; java version "1.4.0_02" Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0_02-b02) Java HotSpot(TM) Client VM (build 1.4.0_02-b02, mixed mode) 3. non-Mandrake systems such as RedHat, SuSE or others the system output is unknown at this time, however I dare say that it will likely be very similar. If anyone reading this knows the correct answer please feel free to send that information in and I'll add it to this document. At this time I can't really speak to what comes with some of the other main Linux distros since I personally am a Mandrake user through and through, although I have been known to roll a RedHat installation around here and there. And, indeed at the moment I've got RedHat 8.0 installed on the same box that Mandrake lives on. I can tell you that in order to compile and run programs written in Java for myself and for school I've had to install Sun's JDK on my RedHat system as well as on my XP and Mandrake installations. Enough of this though...lets get down to business... UNPACKING THE PACKAGE: 1. Enter the directory where you saved the downloaded file(s) to. 2. Chmod the file to 755 so that it's executable. NOTE: you don't have to be root to perform this, but it doesn't to be root since for the following steps you "will" have to be root. 3. After you've chmod'd the package you need to execute the file in order to extract the files for the Java installation. a. in a terminal window issue this command: ./j2sdk-1_4_1_01-linux-i586.bin [enter] <-- means hit ENTER key At this point the file will begin extracting the Java installation from downloaded file. At the bottom left corner of the terminal window you'll see a --[MORE]-- prompt. Hit the space bar to advance the screen. This is the user license agreement that is scrolling by in the terminal as you hit the SPACE bar. At the end of the screen you'll be asked to input either "yes" or "no". Of course if you wish for the Extraction to continue your answer will be "yes". b. After the process terminates there will be a new directory where you downloaded and executed the file named j2sdk-1_4_1_01-linux-i586.bin. The folder name should be j2sdk-1_4_1_01. You can, at this point rename the folder anything you like, however giving the folder a meaningful name according to it's use on your system is a good idea. I've named mine JDK. PREPARING YOUR SYSTEM FOR INSTALLATION: Now it's necessary to make your system ready for the installation of the JDK package. The installation for JRE is identical with a few minor differences that will be clear in a moment. 1. As root user open your favorite filemanager and navigate to /usr/bin. If you're predisposed to using a GUI filemanager thats fine. If you're a die-hard terminal type, thats OK too. cd into the /usr/bin directory. 2. In a terminal window as root user issue this command to create a new directory in /usr. The directory's name should be "java". 3. Copy the directory that was extracted from, and renamed to something meaningfull, from the downloaded Java archive and ALL it's contents into the new directory you've just created, "/usr/java" in /usr. As I mentioned above I renamed mine JDK. So, when I copied the folder and files to /usr/java the resulting tree appears like this: /usr/java/JDK/ <--{folder with files that gets copied} bin/ demo/ include/ jre/ lib/ man/ COPYRIGHT LICENSE README README.html src.zip 4. Locate the following list of files in /usr/bin. They are executable bash scripts: jar java javac javadoc javakey javap jdb 5. Select them all by pressing down and holding the CTRL key. 6. Now, once all the files have been selected hit the DELETE key on your keyboard. Yes...thats right...I said the DELETE key. Since you're going to be replacing these files with others that are taking over their job they're no longer needed and are of no consequence. If you're a bit squeemish about doing this you "could" do the safe thing and rename them all by appending .old to the end of each of the file names, but this procedure has been repeatedly tested and is safe for Penguin consumption. 7. Now since you've gotten rid of the old java files from /usr/bin go to the newly created directory where you installed JDK, and locate the JDK counterparts of the files you've just delete from /usr/bin. Use the list of files from this HOWTO if you're not able to remember exactly. The files you'll need are in /usr/bin/JDK/bin. Select all the only the files in that directory that you'll need to replace the one's you've removed from /usr/bin. You can select them all at once by holding down the CTRL key and then clicking on each file. 8. Now drag the selected files to /usr/bin and drop them into /usr/bin. From the context menu in Konqueror choose "Link Here". Thats it! PERFORMING THIS FROM THE COMMAND LINE: This same procedure can be accomplised easily from the command line as well. Below are the steps for doing just that. 1. remove the old java files from /usr/bin by issuing this command: cd /usr/bin [enter] rm -vf jar java javac javadoc javakey javap jdb 2. create new symlinks from /usr/java/JDK/bin to /usr/bin like so: ln -s /usr/java/JDK/bin/jar /usr/bin/jar ln -s /usr/java/JDK/bin/java /usr/bin/java ln -s /usr/java/JDK/bin/javac /usr/bin/javac ln -s /usr/java/JDK/bin/javadoc /usr/bin/javadoc ln -s /usr/java/JDK/bin/javakey /usr/bin/javakey ln -s /usr/java/JDK/bin/javap /usr/bin/javap ln -s /usr/java/JDK/bin/jdb /usr/bin/jdb And thats all there is to that. The procedure is done and you're ready to use JDK. As an added bonus for those who are "really" new to all this kind of stuff in Linux below is a bash script that will accomplish the same that I've detailed above. To make use of the script simply open your favorite text editor and copy and paste the code into an empty file, making sure to get "all" of it, save the file to the same directory that you've extracted the JDK files to, and chmod the script to 755.
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