JDK Installation Instructions

 1. LinuxIn the environmentJdkthe installation steps1.1 UploadJdk-7u75-linux-x64.tar.gzand Unzip

1. Upload the downloaded jdk-7u75-linux-x64.tar.gz file to a Linux server , or download it online using wget .

2. pressurized jdk-7u75-linux-x64.tar.gz.

the extracted commands are : TAR–ZXVF jdk-7u75-linux-x64.tar.gz

the extracted file directory structure is:

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1.2 SetPATH

1. Create the Java directory under the /usr/local/ directory . command for Mkdir/usr/local/java

2. move the extracted java/jdk1.7.0_75 directory including all the files in the directory to /usr/local/java/

the Copy command is : MV. /jdk1.7.0_75/usr/local/java/

3. Modify profile settings PATH

Execute command : vi/etc/profile

Append the contents to the end of the file:

1. Export java_home=/usr/local/java/jdk1.7.0_75

2. Export Jre_home=/usr/local/java/jdk1.7.0_75/jre

3. export path= $PATH:/usr/local/java/jdk1.7.0_75/bin

4. Export Classpath=./:/usr/local/java/jdk1.7.0_75/lib:/usr/local/java/jdk1.7.0_75/jre/lib

input : Wq exit and save, then restart Linux system

1.3 Verifying the installation results

after restarting the system, enter:java-version, if you see the following instructions your JDK has been installed successfully.

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2. problems that you may encounter

2.1 to uninstall first before installingCentosSelf-installingJdk

[email protected] soft]# java-version
Java Version "1.4.2″
Gij (GNU libgcj) version 4.1.2 20071124 (Red Hat 4.1.2-42)
Note that according to my5.2installed under the circumstances, does not seem to uninstall the self-brought1.4, setJdk6installation is not valid. In order to avoid this situation, we will first uninstall its own1.4version ofJDK.

[Email protected] soft]# Rpm-qa | grep JDK
[Email protected] soft]# Rpm-qa | grep GCJ
Libgcj-4.1.2-42.el5
java-1.4.2-gcj-compat-1.4.2.0-40jpp.115
Check it first . JDK the specific version number, and then

[email protected] jdk1.6.0_11]# yum-y removejava-1.4.2-gcj-compat-1.4.2.0-40jpp.115
Setting up Remove Process
Resolving Dependencies ...... (Start Uninstallation)
Removed:java-1.4.2-gcj-compat.i386 0:1.4.2.0-40jpp.115
Dependency Removed:antlr.i386 0:2.7.6-4jpp.2 bsf.i386 0:2.3.0-11JPP.1 BSH.I3860:1.3.0-9JPP.1 gjdoc.i386 0:0.7.7-12.el5 hsqldb.i386 1:1.8.0.9-1jpp.2openoffice.org-calc.i386
1:2.3.0-6.5.el5 Openoffice.org-core.i386 1:2.3.0-6.5.el5openoffice.org-draw.i386 1:2.3.0-6.5.el5 Openoffice.org-graphicfilter.i3861:2.3.0-6.5.el5 openoffice.org-impress.i386
1:2.3.0-6.5.el5 Openoffice.org-langpack-zh_cn.i386 1:2.3.0-6.5.el5openoffice.org-langpack-zh_tw.i386 1:2.3.0-6.5.el5 Openoffice.org-math.i3861:2.3.0-6.5.el5 openoffice.org-
writer.i386 1:2.3.0-6.5.el5 Openoffice.org-xsltfilter.i386 1:2.3.0-6.5.el5tomcat5-jsp-2.0-api.i386 0:5.5.23-0jpp.7.el5 Tomcat5-servlet-2.4-api.i3860:5.5.23-0jpp.7.el5 xalan-
j2.i386 0:2.7.0-6jpp.1 xerces-j2.i386 0:2.7.1-7JPP.2 xml-commons-apis.i3860:1.3.02-0.b2.7jpp.10 xml-commons-resolver.i386 0:1.1-1jpp.12
Complete! (Uninstall Complete)

JDK Installation Instructions