无法在linux上安装新版本的Java
无法在linux上安装新版本的Java
提问于 2015-02-06 00:28:27
服务器上的java版本是1.6.0_37，我使用yum java-1.7.0-openjdk来安装Java-1.7，但是在使用这个命令之后，当我使用java -version时，Java的版本仍然是1.6.0。如何将其改为1.7？
# yum install java-1.7.0-openjdk
java -version
java version "1.6.0_37"
Java(TM) SE Runtime Environment (build 1.6.0_37-b06)
Java HotSpot(TM) 64-Bit Server VM (build 20.12-b01, mixed mode)我还遵循了以下步骤，但java版本仍然是1.6.0_37
Downloading Latest Java Archive
Java latest archive is available on its official site. We recommend to download latest version of Java from Oracle official website.
For 64 Bit:-
# cd /opt/
# wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/7u75-b13/jdk-7u75-linux-x64.tar.gz"
For 32 Bit:-
# cd /opt/
# wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/7u75-b13/jdk-7u75-linux-i586.tar.gz"
Note: In any case if above command failed to download and you need to download java through Linux terminal, watch below screen cast ( http://screencast.com/t/wf9bQ0XjDPxT ), You are required a graphical browser.
After completing download, Extract archive using following command. Use archive file as per your system configuration. For this example we are using CentOS 6.6 (64 bit) system.
# tar xzf jdk-7u75-linux-x64.tar.gz
Install Java with Alternatives
After extracting Java archive file, we just need to set up to use newer version of Java using alternatives. Use the following commands to do it.
# cd /opt/jdk1.7.0_75/
# alternatives --install /usr/bin/java java /opt/jdk1.7.0_75/bin/java 2
# alternatives --config java
There are 4 programs which provide 'java'.
Selection Command
-----------------------------------------------
* 1 /usr/lib/jvm/jre-1.6.0-openjdk/bin/java
+ 2 /opt/jdk1.7.0_60/bin/java
3 /opt/jdk1.7.0_72/bin/java
4 /opt/jdk1.7.0_75/bin/java
Enter to keep the current selection[+], or type selection number: 4 [Press Enter]
Now you may also required to set up javac and jar commands path using alternatives command.
# alternatives --install /usr/bin/jar jar /opt/jdk1.7.0_75/bin/jar 2
# alternatives --install /usr/bin/javac javac /opt/jdk1.7.0_75/bin/javac 2
# alternatives --set jar /opt/jdk1.7.0_75/bin/jar
# alternatives --set javac /opt/jdk1.7.0_75/bin/javac
Check Installed Java Version
Use following command to check which version of Java is currently being used by system.
# java -version
java version "1.7.0_75"
Java(TM) SE Runtime Environment (build 1.7.0_75-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.75-b04, mixed mode)
Configuring Environment Variables
Most of Java based application’s uses environment variables to work. Use following commands to set up these variable properly. It’s also good to add following commands to any start-up script like ~/.bashrc or ~/.bash_profile.
Setup JAVA_HOME Variable
# export JAVA_HOME=/opt/jdk1.7.0_75
Setup JRE_HOME Variable
# export JRE_HOME=/opt/jdk1.7.0_75/jre
Setup PATH Variable
# export PATH=$PATH:/opt/jdk1.7.0_75/bin:/opt/jdk1.7.0_75/jre/bin我还使用了下面的内容，但仍然显示了以前的版本
root@server [/]# yum search java | grep -i --color JDK
ldapjdk-javadoc.x86_64 : Javadoc for ldapjdk
icedtea-web.x86_64 : Additional Java components for OpenJDK - Java browser
java-1.6.0-openjdk.x86_64 : OpenJDK Runtime Environment
java-1.6.0-openjdk-demo.x86_64 : OpenJDK Demos
java-1.6.0-openjdk-devel.x86_64 : OpenJDK Development Environment
java-1.6.0-openjdk-javadoc.x86_64 : OpenJDK API Documentation
java-1.6.0-openjdk-src.x86_64 : OpenJDK Source Bundle
java-1.7.0-openjdk.x86_64 : OpenJDK Runtime Environment
java-1.7.0-openjdk-demo.x86_64 : OpenJDK Demos
java-1.7.0-openjdk-devel.x86_64 : OpenJDK Development Environment
java-1.7.0-openjdk-javadoc.noarch : OpenJDK API Documentation
java-1.7.0-openjdk-src.x86_64 : OpenJDK Source Bundle
java-1.8.0-openjdk.x86_64 : OpenJDK Runtime Environment
java-1.8.0-openjdk-demo.x86_64 : OpenJDK Demos
java-1.8.0-openjdk-devel.x86_64 : OpenJDK Development Environment
java-1.8.0-openjdk-headless.x86_64 : OpenJDK Runtime Environment
java-1.8.0-openjdk-javadoc.noarch : OpenJDK API Documentation
java-1.8.0-openjdk-src.x86_64 : OpenJDK Source Bundle
ldapjdk.x86_64 : The Mozilla LDAP Java SDK
root@server [/]# yum install java-1.7.0-openjdk java-1.7.0-openjdk-devel
Loaded plugins: fastestmirror
Setting up Install Process
Loading mirror speeds from cached hostfile
* base: centos.hyve.com
* extras: centos.hyve.com
* updates: centos.hyve.com
Package 1:java-1.7.0-openjdk-1.7.0.75-2.5.4.0.el6_6.x86_64 already installed and latest version
Resolving Dependencies
--> Running transaction check
---> Package java-1.7.0-openjdk-devel.x86_64 1:1.7.0.75-2.5.4.0.el6_6 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
Package Arch Version Repository
Size
================================================================================
Installing:
java-1.7.0-openjdk-devel x86_64 1:1.7.0.75-2.5.4.0.el6_6 updates 9.4 M
Transaction Summary
================================================================================
Install 1 Package(s)
Total download size: 9.4 M
Installed size: 36 M
Is this ok [y/N]: y
Downloading Packages:
java-1.7.0-openjdk-devel-1.7.0.75-2.5.4.0.el6_6.x86_64.r | 9.4 MB 00:03
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : 1:java-1.7.0-openjdk-devel-1.7.0.75-2.5.4.0.el6_6.x86_64 1/1
Verifying : 1:java-1.7.0-openjdk-devel-1.7.0.75-2.5.4.0.el6_6.x86_64 1/1
Installed:
java-1.7.0-openjdk-devel.x86_64 1:1.7.0.75-2.5.4.0.el6_6
Complete!
root@server [/]# ls -l /usr/lib/vim
/bin/ls: cannot access /usr/lib/vim: No such file or directory
root@server [/]# ls -l /usr/lib/jvm/
total 12
drwxr-xr-x 3 root root 4096 Feb 6 00:03 ./
drwxr-xr-x 28 root root 4096 Feb 5 22:47 ../
lrwxrwxrwx 1 root root 32 Feb 6 00:03 java-1.7.0 -> /etc/alternatives/java_sdk_1.7.0/
drwxr-xr-x 7 root root 4096 Feb 6 00:03 java-1.7.0-openjdk-1.7.0.75.x86_64/
lrwxrwxrwx 1 root root 34 Feb 6 00:03 java-1.7.0-openjdk.x86_64 -> java-1.7.0-openjdk-1.7.0.75.x86_64/
lrwxrwxrwx 1 root root 34 Feb 6 00:03 java-openjdk -> /etc/alternatives/java_sdk_openjdk/
lrwxrwxrwx 1 root root 21 Feb 5 23:52 jre -> /etc/alternatives/jre/
lrwxrwxrwx 1 root root 27 Feb 5 22:47 jre-1.7.0 -> /etc/alternatives/jre_1.7.0/
lrwxrwxrwx 1 root root 38 Feb 5 22:47 jre-1.7.0-openjdk.x86_64 -> java-1.7.0-openjdk-1.7.0.75.x86_64/jre/
lrwxrwxrwx 1 root root 29 Feb 5 22:47 jre-openjdk -> /etc/alternatives/jre_openjdk/
root@server [/]# vim .bashrc
root@server [/]# java -version
java version "1.6.0_37"
Java(TM) SE Runtime Environment (build 1.6.0_37-b06)
Java HotSpot(TM) 64-Bit Server VM (build 20.12-b01, mixed mode)
root@server [/]# cd $HOME
root@server [~]# vim .bashrc.bashrc含量
# .bashrc
# User specific aliases and functions
alias rm='rm -i'
alias cp='cp -i'
alias mv='mv -i'
# Source global definitions
if [ -f /etc/bashrc ]; then
. /etc/bashrc
fi
export JAVA_HOME="/usr/lib/jvm/jre-1.7.0-openjdk.x86_64"目前，.bashrc的输出如下，但仍在使用相同版本的Java
# .bashrc
# User specific aliases and functions
alias rm='rm -i'
alias cp='cp -i'
alias mv='mv -i'
# Source global definitions
if [ -f /etc/bashrc ]; then
. /etc/bashrc
fi
export JAVA_HOME="/usr/lib/jvm/jre-1.7.0-openjdk.x86_64"
export PATH=$PATH:$JAVA_HOME\bin回答 2
Stack Overflow用户
回答已采纳
发布于 2015-02-06 01:58:38
我通常将jdk安装到Linux上，并得到了与您类似的问题。我通过编辑~/.bash_profile文件来解决问题：
JAVA_HOME=/opt/jdk1.7.0_75
#this should be point to your jdk directory
export JAVA_HOME
PATH=$JAVA_HOME/bin:$PATH
export PATH注释：请注意，在重新定义PATH时，将$JAVA_HOME/bin放在$PATH之前。
然后，运行下面的命令重新加载您的.bash_profile文件
. ~/.bash_profile然后您可以重新打开终端并检查Java版本。
Stack Overflow用户
发布于 2015-02-06 04:46:33
我在/etc/profile 7中将以下内容附加到CentOS中，实现了同样的目的。另外，我用Oracle的官方JDK-8替换了openjdk，但是，这在实际意义上并不重要。
我建议您像我在/etc/profile文件中所做的那样进行更改。根据安装java的系统位置替换实际路径/位置:-
export JAVA_HOME=/usr/java/default
# point location before Java's bin folder in your system
export JRE_HOME=/usr/java/default/jre
# point location before JRE's bin folder in your system
export PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
# append those 2 locations to the PATH environment variable您可以从上面的第一个导出命令中注意到，JAVA_HOME是安装到Java的/bin目录的路径，而JRE_HOME是上升到JRE的/bin目录的路径，因为您可以从上面的第二个导出命令中注意到这一点。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/28356599
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