根据linux自带的JDK,配置JAVA_HOME目录
2020-12-13 05:43
标签:pre classpath tool 选项 pat sts class lte usr 根据linux自带的JDK,配置JAVA_HOME目录 标签:pre classpath tool 选项 pat sts class lte usr 原文地址:https://www.cnblogs.com/guipeng/p/11146679.html在配置hadoop是,进行格式化hadoop的时候,出现找不到jdk
我用centos6.5是64位的, 发现本机有java ,就找了一下其位置
找到了jdk-1.7.0_75
which java
[root@host2 hadoop-1.1.2]# which java
/usr/bin/java
[root@host2 hadoop-1.1.2]# ls /usr/bin/java
/usr/bin/java
[root@host2 hadoop-1.1.2]# ls -l /usr/bin/java
lrwxrwxrwx. 1 root root 22 Jun 20 03:00 /usr/bin/java -> /etc/alternatives/java
[root@host2 hadoop-1.1.2]# ls -l /etc/alternatives/java
lrwxrwxrwx. 1 root root 39 Jun 20 03:00 /etc/alternatives/java -> /usr/lib/jvm/jre-1.7.0-openjdk.x86_64/bin/java (可以看出文件是link ,是个链接)
[root@host2 hadoop-1.1.2]# ls -l /usr/lib/jvm/jre-1.7.0-openjdk.x86_64/bin/java-rwxr-xr-x. 1 root root 36548 Oct 25 2011 /usr/lib/jvm/jre-1.7.0-openjdk.x86_64/bin/java
[root@host2 hadoop-1.1.2]# cd /usr/lib/jvm/jre-1.7.0-openjdk.x86_64
[root@host2 jre-1.7.0-openjdk.x86_64]# ls
bin lib
如此来,可以暂时的断定是 /usr/lib/jvm/jre-1.7.0-openjdk.x86_64
root用户下改配置文件 : vi /etc/profile
找到export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE HISTCONTROL
在下面写上:
export JAVA_HOME=/usr/lib/jvm/jre-1.7.0-openjdk.x86_64
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar
:wq 保存退出
用echo $JAVA_HOME
#更新jdk
update-alternatives --install /usr/bin/java java /opt/jdk1.7.0_79/bin/java 300
update-alternatives --install /usr/bin/javac javac /opt/jdk1.7.0_79/bin/javac 300
update-alternatives --install /usr/bin/jar jar /opt/jdk1.7.0_79/bin/jar 300
update-alternatives --config java
选择带有jdk1.7.0_79 的选项
即可以了