Question

2

Set default java in .bashrc

rated 0 times [ 2] [ 0] / answers: 1 / hits: 1230 / 2 Years ago, sun, june 12, 2022, 8:45:16

By default my ubuntu system is installed with the following java version:

java version "1.7.0_25"

OpenJDK Runtime Environment (IcedTea 2.3.10) (7u25-2.3.10-1ubuntu0.12.04.2)

OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode)

If I type which java it tells me /usr/bin/java.

Now, I have just installed Oracle's Java from their website and have unpacked it inside the directory: opt/local

How do I make the default Java start from opt/local so that I am using Oracle Java instead of OpenJDK? Is this something I need to auto-configure inside my bashrc?
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Thanks, and if you need more information let me know!

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ardingiba

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2 Years ago

answered 2 Years ago lowstonnequ · Accepted Answer

Ubuntu's alternative command management will be helpful here I think.

It's basically organized this way

generic link(e.g. /usr/bin/java) -> buffer link(e.g. /etc/alternatives/java) -> actual command or executable (e.g. /opt/jdk/java)

So you can update the buffer link so that it points to your choice of actual command/executable and still use the generic link to get the job done everywhere as before
_{(of course assuming both commands provides proper functionality ;)}.

Here is a nice guide to update JVM of your choice through update-alternatives command. So do the following

sudo update-alternatives --install "/usr/bin/java" "java" "/opt/local/jdk-xx.xx/bin/java" 1

sudo update-alternatives --install "/usr/bin/javac" "javac" "/opt/local/jdk-xx.xx/bin/javac" 1

You can go on and update the java browser plugin and web-start plugin too as mentioned in the guide. Then choose the java of your choice by

sudo update-alternatives --config java

sudo update-alternatives --config javac