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Java Runtime Environment (JRE) on Linux/Unixby (Thomas Hedden)This article explains how to check whether the Java Runtime Environment (JRE) is installed on a Linux/Unix system, and if it is not installed, how to get it, install it, and configure it. This article will not cover the javac compiler, nor will it cover any operating systems other than Linux/Unix.
The following discussion is broken down into eight steps: Checking whether the JRE is Installed. Checking the PATH Variable for the JREFinding the PATH Statement. Creating a Symbolic Link to the JREAdding the JRE to the PATH Statement in Login Files. Editing the PATH Statement in Login Files.
Getting and Installing Java. Configuring the Java Plugin. There are several possible ways to check whether the Java Runtine Environment is installed on a Linux/Unix computer, depending on how the JRE was installed (if it actually was installed, that is) and what other programs are available to find installed programs. One of the easiest ways is to use the program called . When programs such as the JRE are installed, it is common to create such symbolic links to them to provide a unique, unchanging location that can be put in the PATH statement, so that the PATH statement does not have to be modified if the program's location is subsequently changed: All that is necessary is to change the symbolic link (see below). To determine whether you have found the actual location of the JRE or a symbolic link to it, type the . Note that if the link target is something like .
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To test this, type. If the . Now you still have to check whether it is present in your PATH variable (see below). In this example, the version number is indicated by the number . If the path to the java program does not contain an indication about its version, then use the . In this case, try the .
The one you want will end in something like . When programs such as the JRE are installed, it is common to create such symbolic links to them to provide a unique, unchanging location that can be put in the PATH statement, so that the PATH statement does not have to be modified when the program is subsequently updated: All that is necessary is to change the symbolic link (see below). To determine whether you have found the actual location of the JRE or a symbolic link to it, use the . In this example, the version number is indicated by the number .
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- The installation of Java (also known as the Java Runtime Environment or JRE). Use these instructions to install Java software on your desktop.
- The place to collaborate on an open-source implementation of the Java Platform. Download and install the open-source JDK 8 for most popular Linux distributions.
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One step yum install of java 1.7 in 32 bit with Linux. Previously I was installing java 1.7 in 32 bit format with the following. Configuring Your Java Environment. You can install the 32-bit or 64-bit JVM as per your requirements. Before applying this update, make sure all previously released errata relevant to your system have been applied. To install the IBM Java Runtime Environment and the Java 2 Technology Edition of the IBM Developer Kit for Linux. This article will walk through the process of installing Sun/Oracle Java 8 JDK/JRE 8u45 on RHEL/CentOS 7/6/5 and Fedora. Install Java 8 in CentOS, Fedora and RedHat.
If the path to the java program does not contain an indication about its version, then use the . The java program will respond with something like. You might find several different versions of the JRE installed on your computer. In this case, you should probably use the one with the highest version, unless you know a specific reason to use an older one. If the JRE is installed on your computer, you should also check whether the java program is present in your PATH variable.
You can test this by doing the version test at a command prompt that is in a directory other than the one in which the JRE version you want resides. If the PATH statement contains the wrong version, see below.) If the which program does not find the path to the JRE, you will have to add it to the PATH statement in the files that are executed when you login. The PATH variable is defined by the PATH statement, which is found in the files that are executed when you login. The files that are executed when you login depend on what shell you are using.
To determine which shell you are using, type. The shell will respond with something like . You are probably using the . Now, use a file management program such as Konqueror to explore the files in your home directory. To make sure that you are in your home directory in Konqueror, simply click on the . To find your home directory in an interactive shell, type. The shell will respond with the currect directory, which will be your home directory if you have just executed a .
If you are using a file management program, make sure that it is configured to show . To do this in Konqueror, select the menu command . If you are doing this in an interactive shell, please note that the command .
Note that these files begin with a period (. If none of these files exist in your home directory, then create the first of them in your home directory. If one or more of these files does exist, then open it/them in this same order in a text editor (not a word processor such as Open. Office. org), and look for a statement that says something like . Take the first one of these files you find that has a PATH statement, and make a backup copy of it, either in the file management program or in the shell.
If that should happen, you can simply delete the file you messed up, and copy your backup copy back to its original name.) To make a backup copy in the shell, type. The simplest thing to do is to put the absolute path to the. JRE in the PATH statement. However, if you do this, then the next.
JRE that is installed on your computer. PATH statement again. If you are comfortable with. Another approach is to create a symbolic link to the JRE in a directory such as .
Whenever you upgrade the JRE in the future, all you will have to do is change the symbolic link. The following discussion will explain both approaches. You should decide on one and use it. You may want to read through both approaches before you actually do anything.
This approach involves creating a symbolic link (shortcut) to the current version of the JRE, and then putting the symbolic link in your PATH statement. When you upgrade the JRE, you will have to delete the symbolic link to the old JRE and create a new symbolic link to the new JRE. A symbolic link can be created as follows.
Say that the actual location of the JRE is . Then, type. $ ln - s /usr/lib/Sun.
Java. 2- 1. 4. 2/jre/bin/java /usr/local/bin/java. If a symbolic link already exists, for example if there is a symbolic link to an older version of the JRE, then you will get an error message such as . In this case you will have to delete the existing symbolic link before you can create a new one. Do not worry about the .
Now all that is necessary is to add this link to the PATH statement in the login files. Open the login file in which the PATH statement is defined (the original file, not the backup) in a text editor and add either the java program's path or the symbolic link's path to the end of the PATH statement. If you don't know how to do this, the safest and easiest way to do this is to find the last PATH statement in the file, and to add, on the very next line, the actual location of the JRE. PATH=$. On your computer it will be different. Remember to leave off the final . Don't forget the colon.
When you are done, save the file. Alternatively, if you want to add a symbolic link instead of the actual location of the JRE, add the following. PATH=$. In this case, simply add the PATH statement given above someplace to the appropriate login file.
If your shell is . If it does not exist, then create it.
If it does exist, search it for the last PATH statement, and make the same change as was explained above for the bash shell. If your shell is . If neither of them exists, create them. If these files do exist, search them for the PATH statement, and change the file with the PATH statement as explained above for the bash shell. Note that the PATH statement will probably begin with the word .
However, it is possible that it could be set in one of the files . I recommend that you make the change to the PATH variable assignment in the same file where you find it. If you have to create these files, then you should put the PATH variable assignment in the file called . If are still having trouble, try the following command in an interactive shell. Remember that the shell is case- sensitive, and that the word . Instead, you must actually edit the PATH statement.
The reason why is that the shell will use the first instance of the java program that it finds in the PATH statement. To edit the PATH statement, use the above procedures to find the java program's path in the PATH statement and make a backup copy of the file that contains it, as described above. Next, use a text editor to open the file that contains the java program's PATH statement, and make a backup copy of the line that contains the wrong PATH statement. To do this, first copy the line that contains the wrong PATH statement. PATH=/bin: /usr/bin: /usr/local/bin: /wrong/jre/path. First, you can look back and forth between the backup copy of the line and the line you are editing, to make sure that you don't make a mistake. Second, if you do make a bad mistake, you can make a fresh copy of the line and start over.)Now, carefully change the wrong JRE path to the correct one.
Make sure to do this in the active PATH statement (the one without the . When you are done, save the file, open a new interactive shell, and repeat the above test (. If this is not the case, or if you have a fairly old distribution, then you can download the JRE free from Sun Microsystems.
Sun's Java website should recognize your platform as Linux automatically, and instructions are provided there, so they will not be repeated here. I recommend getting the RPM download unless you know that you do not want an RPM. I should also point out that unless you know that you have a 6. AMD processor, don't select one of the . Follow the instructions carefully, and then repeat the tests above to verify that the JRE is installed and that the java program is in your PATH statement. Note that the . In particular, different versions of Mozilla / Netscape need to have different plugins installed. If you install the wrong one, Mozilla might crash when you try to use the Java plugin.
The different versions of the plugin will be in subdirectories of a directory called something like . Determining which one you need can be a little difficult, but you can try typing the command .
If your system responds with something like . If your system gives a lower number such as gcc- 2.