{"id":25,"date":"2017-05-25T10:48:00","date_gmt":"2017-05-25T10:48:00","guid":{"rendered":"\/colin\/morethanfour\/post\/Installing-Oracles-JDK-in-Ubuntu-Linux"},"modified":"2017-05-25T10:48:00","modified_gmt":"2017-05-25T10:48:00","slug":"installing-oracles-jdk-in-ubuntu-linux","status":"publish","type":"post","link":"https:\/\/spacefold.com\/colin\/morethanfour\/2017\/05\/25\/installing-oracles-jdk-in-ubuntu-linux\/","title":{"rendered":"Installing Oracle’s JDK in Ubuntu Linux"},"content":{"rendered":"

Just for my own notes, because I can never remember this stuff. <\/p>\n

1. Check the architecture of your host:<\/p>\n

\n
colin@Mongpy:~$ uname -m<\/font><\/strong>
x86_64<\/pre>\n
<\/div>\n
2. Grab the appropriate download from Oracle’s web site:<\/p>\n
\"image\"<\/p>\n
My web browser puts it in the Downloads folder under home.<\/p>\n
\n
colin@Mongpy:~$ ls -l ~\/Downloads<\/font><\/strong>
total 393356
drwxr-sr-x 7 colin colin 4096 Mar 31 12:21 eclipse-installer
-rw-rw-r-- 1 colin colin 185540433 May 25 13:19 jdk-8u131-linux-x64.tar.gz
-rw-rw-r-- 1 colin colin 21944320 Mar 29 14:18 mysql-workbench-community-6.3.9-1ubuntu16.10-amd64.deb
-rw-rw-r-- 1 colin colin 195297254 May 25 12:47 pycharm-community-2017.1.3.tar.gz<\/pre>\n
<\/div>\n
3. Open a terminal and get superuser access:<\/p>\n
\n
colin@Mongpy:~$ sudo su<\/font><\/strong>
[sudo] password for<\/span> colin:
root@Mongpy:\/home\/colin#<\/pre>\n
<\/div>\n
4. Make a directory and expand the archive:<\/p>\n
\n
root@Mongpy:\/home\/colin# mkdir \/opt\/jdk<\/span>
root@Mongpy:\/home\/colin# tar -zxf .\/Downloads\/jdk-8u131-linux-x64.tar.gz -C \/opt\/jdk<\/span>
root@Mongpy:\/home\/colin# ls -l \/opt\/jdk<\/span>
total 4
drwxr-xr-x 8 uucp 143 4096 Mar 15 01:35 jdk1.8.0_131<\/pre>\n
<\/div>\n
5. Review the current default JDK:<\/p>\n
\n
root@Mongpy:~# update-alternatives --display java<\/strong><\/span>
java - auto mode
link best version is \/usr\/lib\/jvm\/java-8-openjdk-amd64\/jre\/bin\/java
link currently points to \/usr\/lib\/jvm\/java-8-openjdk-amd64\/jre\/bin\/java
link java is \/usr\/bin\/java
slave java.1.gz is \/usr\/share\/man\/man1\/java.1.gz
\/usr\/lib\/jvm\/java-8-openjdk-amd64\/jre\/bin\/java - priority 1081<\/font>
slave java.1.gz: \/usr\/lib\/jvm\/java-8-openjdk-amd64\/jre\/man\/man1\/java.1.gz
 
root@Mongpy:~# update-alternatives --display javac<\/strong><\/span>
javac - auto mode
link best version is \/usr\/lib\/jvm\/java-8-openjdk-amd64\/bin\/javac
link currently points to \/usr\/lib\/jvm\/java-8-openjdk-amd64\/bin\/javac
link javac is \/usr\/bin\/javac
slave javac.1.gz is \/usr\/share\/man\/man1\/javac.1.gz
\/usr\/lib\/jvm\/java-8-openjdk-amd64\/bin\/javac - priority 1081<\/font>
slave javac.1.gz: \/usr\/lib\/jvm\/java-8-openjdk-amd64\/man\/man1\/javac.1.gz<\/pre>\n
<\/div>\n
Note the current “priority” is 1081<\/strong>.<\/p>\n
6. Set the Oracle version as the default JDK, using a higher priority, say 1090:<\/p>\n
\n
root@Mongpy:\/home\/colin# update-alternatives --install \/usr\/bin\/java java \/opt\/jdk\/jdk1.8.0_131\/bin\/java 1090<\/strong><\/span>
 
update-alternatives: using \/opt\/jdk\/jdk1.8.0_131\/bin\/java to provide \/usr\/bin\/java (java) in<\/span> auto mode
 
root@Mongpy:\/home\/colin# update-alternatives --install \/usr\/bin\/javac javac \/opt\/jdk\/jdk1.8.0_131\/bin\/javac 1090<\/strong><\/span>
 
update-alternatives: using \/opt\/jdk\/jdk1.8.0_131\/bin\/javac to provide \/usr\/bin\/javac (javac) in<\/span> auto mode
 
root@Mongpy:\/home\/colin# update-alternatives --display java<\/strong><\/span>
java - auto mode
  link best version is \/opt\/jdk\/jdk1.8.0_131\/bin\/java
  link currently points to \/opt\/jdk\/jdk1.8.0_131\/bin\/java
  link java is \/usr\/bin\/java
  slave java.1.gz is \/usr\/share\/man\/man1\/java.1.gz
\/opt\/jdk\/jdk1.8.0_131\/bin\/java - priority 1090
\/usr\/lib\/jvm\/java-8-openjdk-amd64\/jre\/bin\/java - priority 1081
  slave java.1.gz: \/usr\/lib\/jvm\/java-8-openjdk-amd64\/jre\/man\/man1\/java.1.gz
 
root@Mongpy:\/home\/colin# update-alternatives --display javac<\/strong><\/span>
javac - auto mode
  link best version is \/opt\/jdk\/jdk1.8.0_131\/bin\/javac
  link currently points to \/opt\/jdk\/jdk1.8.0_131\/bin\/javac
  link javac is \/usr\/bin\/javac
  slave javac.1.gz is \/usr\/share\/man\/man1\/javac.1.gz
\/opt\/jdk\/jdk1.8.0_131\/bin\/javac - priority 1090
\/usr\/lib\/jvm\/java-8-openjdk-amd64\/bin\/javac - priority 1081
  slave javac.1.gz: \/usr\/lib\/jvm\/java-8-openjdk-amd64\/man\/man1\/javac.1.gz
<\/pre>\n
<\/div>\n
7. Finally, testing:<\/p>\n
\n
colin@Mongpy:~$ java -version<\/font><\/strong>
java version \"1.8.0_131\"<\/span>
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)<\/pre>\n
<\/div>\n
Cool.<\/p>\n","protected":false},"excerpt":{"rendered":"
Just for my own notes, because I can never remember this stuff. 1. Check the architecture of your host: colin@Mongpy:~$ uname -mx86_64 2. Grab the appropriate download from Oracle’s web site: My web browser puts it in the Downloads folder under home. colin@Mongpy:~$ ls -l ~\/Downloadstotal 393356drwxr-sr-x 7 colin colin 4096 Mar 31 12:21 eclipse-installer-rw-rw-r– […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[],"class_list":["post-25","post","type-post","status-publish","format-standard","hentry","category-linux","post-preview"],"_links":{"self":[{"href":"https:\/\/spacefold.com\/colin\/morethanfour\/wp-json\/wp\/v2\/posts\/25","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/spacefold.com\/colin\/morethanfour\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/spacefold.com\/colin\/morethanfour\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/spacefold.com\/colin\/morethanfour\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/spacefold.com\/colin\/morethanfour\/wp-json\/wp\/v2\/comments?post=25"}],"version-history":[{"count":0,"href":"https:\/\/spacefold.com\/colin\/morethanfour\/wp-json\/wp\/v2\/posts\/25\/revisions"}],"wp:attachment":[{"href":"https:\/\/spacefold.com\/colin\/morethanfour\/wp-json\/wp\/v2\/media?parent=25"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/spacefold.com\/colin\/morethanfour\/wp-json\/wp\/v2\/categories?post=25"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/spacefold.com\/colin\/morethanfour\/wp-json\/wp\/v2\/tags?post=25"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}