Centos Java Installation

First step: Check if the Linux-brought JDK is installed (uninstall CentOS installed 1.4)

The installed CentOS will bring openjdk, with the command java-version, will have the following information:

Java Version "1.6.0"
OpenJDK Runtime Environment (build 1.6.0-b09)
OpenJDK 64-bit Server VM (build 1.6.0-b09, Mixed mode)

It is best to uninstall the OPENJDK before installing Sun's JDK.

See Rpm-qa First | grep java

The following information is displayed:

java-1.4.2-gcj-compat-1.4.2.0-40jpp.115
Java-1.6.0-openjdk-1.6.0.0-1.7.b09.el5

Unloading:

RPM-E--nodeps java-1.4.2-gcj-compat-1.4.2.0-40jpp.115
RPM-E--nodeps Java-1.6.0-openjdk-1.6.0.0-1.7.b09.el5

There are some other commands.

Rpm-qa | grep GCJ

Rpm-qa | grep JDK

If OpenJDK source cannot be found, you can also uninstall this

Yum-y Remove Java java-1.4.2-gcj-compat-1.4.2.0-40jpp.115
Yum-y Remove Java Java-1.6.0-openjdk-1.6.0.0-1.7.b09.el5

<1># rpm-qa|grep jdk← View JDK information or execute directly
Or
# rpm-q JDK
Or
# java-version
<2># Rpm-qa | grep gcj← Confirm version number of GCJ
<3># yum-y Remove java-1.4.2-gcj-compat← Uninstall GCJ

The second step is to install the sun's JDK.

Official website: http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

Create a Java directory under/usr in case the Java program is installed in this directory, enter the following command:

Linux Code

1. Mkdir/usr/java

Copy the downloaded file to the/usr/java directory and enter the following command:

[Plain]View Plaincopy

2. [Email protected] java]# Mv/home/ivan/downloads/jdk-7u60-linux-x64.rpm/usr/java
4. [[email protected] java]# ls
6. jdk-7u60-linux-x64.rpm
8. [Email protected] java]# RPM-IVH jdk-7u60-linux-x64.rpm
10. Preparing ... ########################################### [100%]
12. 1:JDK ########################################### [100%]
14. Unpacking JAR files ...
16. Rt.jar ...
18. Jsse.jar ...
20. Charsets.jar ...
22. Tools.jar ...
24. Localedata.jar ...
26. Jfxrt.jar ...
28. [[email protected] java]# ls
30. Default Jdk1.7.0_60 jdk-7u60-linux-x64.rpm Latest

Then configure the environment variable to enter the configuration file by entering the following command.

[Email protected] java]# Vi/etc/profile
Include in the file

Export PATH USER LOGNAME MAIL HOSTNAME histsize Histcontrol
Export java_home=/usr/java/jdk1.7.0_60
Export path= $JAVA _home/bin: $PATH
Export classpath=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar

Let the environment variable take effect.

Execute the configuration file so that it takes effect immediately and enter the following command:

[Email protected] java]# Source/etc/profile

View the current version of Java installation
[Email protected] java]# java-version
Java Version "1.7.0_60"
Java (TM) SE Runtime Environment (build 1.7.0_60-b19)
Java HotSpot (TM) 64-bit Server VM (build 24.60-b09, Mixed mode)

This article refer to http://hermosa-young.iteye.com/blog/1798026

Centos Java Installation