Linux & DevOPS.: apt-cache

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Installation process to Install OpenJKD 8 in Ubuntu 14.10</h2>
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Tutorial to explain how to install OpenJKD 8 on Ubuntu 14.10</h3>
I found that Ubuntu 14.10 & Fedora 21 have OpenJDK 8 packages. By default Fedora 21 comes with OpenJKD 8. 
So, here I’m going to explain how to install OpenJKD 8 on Ubuntu 14.10 
 
1) Check current version of java 
Use the below command to check installed version of java in your system. 
 
root@amitmaheshwari.in [~]# java -version 
java version "1.7.0_72" 
Java(TM) SE Runtime Environment (build 1.7.0_72-b14) 
Java HotSpot(TM) 64-Bit Server VM (build 24.72-b04, mixed mode) 
The output clearly shows, i have installed Oracle JAVA 7 in my system. 
 
2) Search OpenJDK 8 Packages 
Use the below command to search OpenJDK 8 packages in your system. 
 
root@amitmaheshwari.in [~]# apt-cache search openjdk-8-* 
openjdk-8-dbg - Java runtime based on OpenJDK (debugging symbols) 
openjdk-8-demo - Java runtime based on OpenJDK (demos and examples) 
openjdk-8-doc - OpenJDK Development Kit (JDK) documentation 
openjdk-8-jdk - OpenJDK Development Kit (JDK) 
openjdk-8-jre - OpenJDK Java runtime, using Hotspot JIT 
openjdk-8-jre-headless - OpenJDK Java runtime, using Hotspot JIT (headless) 
openjdk-8-jre-jamvm - Alternative JVM for OpenJDK, using JamVM 
openjdk-8-jre-zero - Alternative JVM for OpenJDK, using Zero/Shark 
openjdk-8-source - OpenJDK Development Kit (JDK) source files 
 
3) Install OpenJDK 8 packages 
Use the below command to install OpenJDK 8 packages in your system. 
 
4) Setup OpenJDK 8 as default 
Use the below command to setup OpenJDK 8 as default java in your system. 
 
root@amitmaheshwari.in [~]# sudo update-alternatives --config java 
There are 3 choices for the alternative java (providing /usr/bin/java). 
 
  Selection    Path                                            Priority   Status 
------------------------------------------------------------ 
* 0            /usr/lib/jvm/java-7-oracle/jre/bin/java          1072      auto mode 
  1            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   1071      manual mode 
  2            /usr/lib/jvm/java-7-oracle/jre/bin/java          1072      manual mode 
  3            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java   1069      manual mode 
 
Press enter to keep the current choice[*], or type selection number: 3 
update-alternatives: using /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java to provide /usr/bin/java (java) in manual mode 
 
 
5) Check current version of java 
Use the below command to check installed version of java in your system. 
 
root@amitmaheshwari.in [~]# java -version 
openjdk version "1.8.0_40-internal" 
OpenJDK Runtime Environment (build 1.8.0_40-internal-b09) 
OpenJDK 64-Bit Server VM (build 25.40-b13, mixed mode) 
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How to install OpenJKD 8 on Ubuntu 14.10

Installation process to Install OpenJKD 8 in Ubuntu 14.10 Tutorial to explain how to install OpenJKD 8 on Ubuntu 14.10 I found that Ubu...