Linux under RPM for loading and unloading JDK

1. If Linux is CentOS, please uninstall OPENJDK first

Java-version, there will be the following information:

java version  "1.6.0_24

Uninstall the default
Log in to the system with the root user and open a terminal input
# Rpm-qa|grep GCJ
Display content contains the following two lines of information
# JAVA-1.4.2-GCJ-COMPAT-1.4.2.0-27JPP
# JAVA-1.4.2-GCJ-COMPAT-DEVEL-L.4.2.0-27JPP
Unloading
# RPM-E JAVA-1.4.2-GCJ-COMPAT-DEVEL-L.4.2.0-27JPP
# RPM-E JAVA-1.4.2-GCJ-COMPAT-L.4.2.0-27JPP

Or

See Rpm-qa First | grep java

The following information is displayed:

java-1.5.0-gcj-1.5.0.0-29.1.el6.i686
java-1.6.0-openjdk-1.6.0.0-1.50.1.11. 5.e16_3-i386
Uninstall OPENJDK:

RPM-E--nodeps java-1.5.0-gcj-1.5.0.0-29.1.el6.i686
RPM-E--nodeps java-1.6.0-openjdk-1.6.0.0-1.50.1.11.5.e16_3-i386
There are some other commands to uninstall OPENJDK

Rpm-qa | grep GCJ

Rpm-qa | grep JDK
If OpenJDK source cannot be found, you can also uninstall this

Yum-y Remove Java java-1.5.0-gcj-1.5.0.0-29.1.el6.i686
Yum-y remove Java java-1.6.0-openjdk-1.6.0.0-1.50.1.11. 5.e16_3-i386

(Uninstall any other JDK you have installed and use RPM-E <javaXXXXX>
Uninstall the RPM version of the JDK:

#rpm-qa|grep JDK

Display: Jdk-1.6.0_10-fcs
Uninstall: #rpm-e--nodeps Jdk-1.6.0_10-fcs )

2. Add executable permissions and install:
#chmod +x jdk-7u25-linux-x64.rpm
#rpm-IVH jdk-7u25-linux-x64.rpm
Execution Result:
[Email protected] java]# RPM-IVH jdk-7u25-linux-x64.rpm
Preparing ... ########################################### [100%]
1:JDK ########################################### [100%]
Unpacking JAR files ...
Rt.jar ...
Jsse.jar ...
Charsets.jar ...
Tools.jar ...
Localedata.jar ...

3. Configure Environment variables
① Enter Edit Profile

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#vim/etc/profile
② at the end of the profile file to add the following:
Export java_home=/usr/java/jdk1.7.0_25
Export classpath=.: $JAVA _home/jre/lib/rt.jar: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar
Export path= $PATH: $JAVA _home/bin
③ Save and exit, perform the following

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#source/etc/profile
4. View Java version

[Plain] View plaincopy
[Email protected] java]# java-version
Java Version "1.7.0_25"
Java (TM) SE Runtime Environment (build 1.7.0_25-b15)
Java HotSpot (TM) 64-bit Server VM (build 23.25-b01, Mixed mode)

Linux under RPM for loading and unloading JDK