CentOS 7 Java version switch

There is a project that requires Java 1.7 Mates, Java 1.8 is already installed on the original server, and the version needs to be switched to Java 1.7.

View supported Java versions of CENTOS7

yum search java|grep java-1java-1.6.0-openjdk.x86_64 : openjdk runtime  environmentjava-1.6.0-openjdk-demo.x86_64 : openjdk demosjava-1.6.0-openjdk-devel.x86_64 :  openjdk development environmentjava-1.6.0-openjdk-javadoc.x86_64 : openjdk api  Documentationjava-1.6.0-openjdk-src.x86_64 : OpenJDK Source  bundlejava-1.7.0-openjdk.x86_64 : openjdk runtime  environmentjava-1.7.0-openjdk-accessibility.x86_64 : openjdk accessibility  connectorjava-1.7.0-openjdk-demo.x86_64 : openjdk demosjava-1.7.0-openjdk-devel.x86_64 :  openjdk development environmentjava-1.7.0-openjdk-headless.x86_64 : the openjdk  runtime environment withoutjava-1.7.0-openjdk-javadoc.noarch : openjdk api  documentationjava-1.7.0-openjdk-src.x86_64 : openjdk source bundlejava-1.8.0-openjdk.x86_64 : openjdk runtime environmentjava-1.8.0-openjdk-accessibility.x86_64  : openjdk accessibility connectorjava-1.8.0-openjdk-accessibility-debug.x86_64 :  OpenJDK accessibility connectorjava-1.8.0-openjdk-debug.x86_64 : OpenJDK  runtime environment with full debug onjava-1.8.0-openjdk-demo.x86_64 :  Openjdk demosjava-1.8.0-openjdk-demo-debug.x86_64 : openjdk demos with full  debug onjava-1.8.0-openjdk-devel.x86_64 : OpenJDK Development  environmentjava-1.8.0-openjdk-devel-debug.x86_64 : openjdk development environment  withjava-1.8.0-openjdk-headless.x86_64 : openjdk runtime  environmentjava-1.8.0-openjdk-headless-debug.x86_64 : openjdk runtime environment  With fulljava-1.8.0-openjdk-javadoc.noarch : openjdk api documentationjava-1.8.0-openjdk-javadoc-debug.noarch : openjdk api documentation for  packagesjava-1.8.0-openjdk-src.x86_64 : openjdk source  Bundlejava-1.8.0-openjdk-src-debug.x86_64 : openjdk source bundle for packages  with

Installing Java version 1.7

Yum Install java-1.7.0

Use Update-alternatives to view installed Java versions

update-alternatives --listlibnssckbi.so.x86_64    auto    /usr/ lib64/pkcs11/p11-kit-trust.sold      auto    /usr/bin/ ld.bfdmkisofs auto    /usr/bin/genisoimageprint   auto     /usr/bin/lpr.cupsjava    manual  /usr/lib/jvm/ Java-1.7.0-openjdk-1.7.0.111-2.6.7.2.el7_2.x86_64/jre/bin/javajre_openjdk     auto     /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-1.b15.el7_2.x86_64/jrejre_1.8.0        auto    /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-1.b15.el7_ 2.x86_64/jrejre_1.8.0_openjdk       auto    /usr/lib/ Jvm/jre-1.8.0-openjdk-1.8.0.111-1.b15.el7_2.x86_64xinputrc        auto     /etc/x11/xinit/xinput.d/ibUs.conflibjavaplugin.so.x86_64 auto    /usr/lib64/icedteaplugin.socifs-idmap-plugin        auto    /usr/lib64/cifs-utils/cifs_idmap_ sss.somta     auto    /usr/sbin/sendmail.postfixcdrecord         auto    /usr/bin/wodimlibwbclient.so.0.12-64   auto    /usr/lib64/samba/wbclient/libwbclient.so.0.12jre_1.7.0        auto    /usr/lib/jvm/ java-1.7.0-openjdk-1.7.0.111-2.6.7.2.el7_2.x86_64/jrejre_1.7.0_openjdk        auto    /usr/lib/jvm/jre-1.7.0-openjdk-1.7.0.111-2.6.7.2.el7_2.x86_64

See java1.7 installed successfully, switch version to Java 1.7

Update-alternatives--config Javathere is 2 programs which provide ' Java '. Selection Command-----------------------------------------------* 1/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.11 1-1.b15.el7_2.x86_64/jre/bin/java + 2/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.111-2.6.7.2.el7_2.x86_64/jre/bin/jav Aenter to keep the current selection[+], or type selection number:2

View the Java version being used

Java-versionjava version "1.7.0_111" OpenJDK Runtime Environment (rhel-2.6.7.2.el7_2-x86_64 u111-b01) OpenJDK 64-bit Server VM (build 24.111-b01, Mixed mode)

Successfully switched to Java version 1.7.

This article is from the "focus on drilling 100 years" blog, please be sure to keep this source http://titandeng.blog.51cto.com/823817/1876678

CentOS 7 Java version switch