redhat 默认java_redhat配置java环境

https://my.oschina.net/caryliu/blog/264507

1.检查是否有旧版本的jdk

java -version

java version "1.4.2"

gij (GNU libgcj) version 4.1.2 20080704 (Red Hat 4.1.2-48)

This is free software; see the source for copying conditions. There is NO

warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[root@localhost soft]# rpm -qa|grep gcj

libgcj-4.1.2-48.el5

java-1.4.2-gcj-compat-1.4.2.0-40jpp.115

libgcj-4.1.2-48.el5

2.卸载旧的jdk

[root@localhost soft]# rpm -e --nodeps java-1.4.2-gcj-compat-1.4.2.0-40jpp.115

[root@localhost soft]# java -version

-bash: /usr/bin/java: 没有那个文件或目录

3.后安装新的jdk

./ jdk-1_5_0_15-linux-i586.bin

mkdir /usr/java

mv jdk1.5.0_15 /usr/java/

ln -s /usr/java/jdk1.5.0_16/bin/java /usr/bin/java

ln -s /usr/java/jdk1.5.0_16/bin/javac /usr/bin/javac

4.编写环境变量:

操作如下

#vi /etc/profile

JAVA_HOME=/usr/java/jdk1.5.0_16

JRE_HOME=/usr/java/jdk1.5.0_16/jre

PATH=$PATH:$JAVA_HOME/bin:JRE_HOME/bin

CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib:

export JAVA_HOME JRE_HOME PATH CLASSPATH

5.使环境变量生效:

#source /etc/profile

转载于:https://my.oschina.net/caryliu/blog/264507

标签：bin,1.4,java,redhat,配置,jdk1.5,usr,HOME

来源： https://blog.csdn.net/chuihuang8310/article/details/100892489