Linux installation JDK and tomcat specified JDK version

Method 1: Install with the yum command

1. View current JDK version: Java–version, or: Rpm-qa | grep JDK

2. Remove the current jdk:yum-y remove java-1.6.0-openjdk

3. View the available JDK versions in the Yum repository: Yum search jdk

4. Install Java version 1.7:

Yum Install JAVA-1.7.0-OPENJDK

Yum Install Java-1.7.0-openjdk-devel

The default installation is in the/usr directory.

5. Do not configure the Java environment variables.

Method Two, install the package installation

1. Copy the installation package jdk-7u79-linux-x64.gz to the directory/usr/local/java

2. Unzip: TAR-ZXVF jdk-7u79-linux-x64.gz generate installation directory jdk1.7.0_79

3. Configure Environment variables

Modify the/etc/profile and add the following on the last side:

#set Java Environment

java_home=/usr/local/java/jdk1.7.0_79

Class_path=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar

Path= $JAVA _hoem/bin: $PATH

Export Java_home Class_path PATH

Tomcat's startup script automatically gets the value of java_home from the environment variable, so that Tomcat runs with the JDK specified by Java_home.

4. You can specify a JDK for Tomcat.

When multiple versions of the JDK are installed in the system, you can specify the JDK version for Tomcat.

Add the following line to the white space at the beginning of the catalina.sh file and the setclasspath.sh file:

Export java_home=/usr/loca/java/jdk1.7.0_79

Linux installation JDK and tomcat specified JDK version