默认安装centos后,会给安装openJDK java的开源版本,但是在etc/profile并没有配置环境变量,也能执行,所以很奇怪,其实是在usr/bin建立一个java的软连接,而usr/bin文件夹在配置里边
查找步骤如下:
1.which java
[hqm@localhost ~]$ which java
/usr/bin/java
发现定位在/usr/bin/java
2.ls -al /usr/bin/java
[hqm@localhost bin]$ ls -al java
lrwxrwxrwx. 1 root root 22 Mar 9 2016 java -> /etc/alternatives/java
软连接到/etc/alternatives/java
3.ls -al /etc/alternatives/ ls -al /etc/alternatives/java
lrwxrwxrwx. 1 root root 72 Mar 9 2016 /etc/alternatives/java -> /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.51-2.4.5.5.el7.x86_64/jre/bin/java
连接到真正安装的目录下
把tomcat直接加压后尽然tomcat可以启动起来