Procedure 2.3. Installing Java

1. Subscribe your system to the appropriate channel:
   • Red Hat Enterprise Linux Server Supplementary for Red Hat Enterprise Linux 7
   • Red Hat Enterprise Linux Server Supplementary for Red Hat Enterprise Linux 6
   • Red Hat Enterprise Linux Supplementary for Red Hat Enterprise Linux 5
2. On the command line, as the root user run the command to install Java 1.6 or 1.7:
   • On Red Hat Enterprise Linux 5, Red Hat Enterprise Linux 6, and Red Hat Enterprise Linux 7, execute the yum install command to install Java 1.6:

     # yum install java-1.6.0-<VENDOR>-devel

     Substitute <VENDOR> with sun, ibm, or openjdk.
     Execute the following variation of the listed command to install Java 1.7:

     # yum install java-1.7.0-<VENDOR>-devel

     Substitute <VENDOR> with oracle, ibm, or openjdk.
3. Run the following commands as the root user (if switching from another user, make sure to run the command su -) to make sure the correct JDK is in use:

   # alternatives --config java

   # alternatives --config javac

   These commands return lists of available JDK versions with the version in use marked with a plus (+) sign. If the set JDK is not the desired option, switch to the right JDK as instructed on the command line.

   Important

   Any software that makes use of the java and javac commands is using the JDK set by alternatives. Switching java alternatives may negatively influence running of such software.
4. Install the required packages (see Section 2.3.2, “ZIP Installation Prerequisites”)