How to uninstall manually installed java? (jdk 8)

Question

I am using Ubuntu 14.04 LTS 64 bit and installed the wrong version of Sun/Oracle's Java JDK (32 bit instead of 64 bit) using the Ask Ubuntu Post

I assume I have to uninstall it now. How can I do that?

Solution

Run:

sudo update-alternatives --remove-all java
sudo update-alternatives --remove-all javac
sudo update-alternatives --remove-all javaws
sudo rm -rf /usr/lib/jvm/jdk1.8.0

Comments

[kos]

@Testing360 No problem :)

[Rinzwind]

That last command is wrong. It will remove anything below ./jvm/. That could be just jdk1.8.0 but a lot more.

[kos]

@Rinzwind What could that be, aside from other installations of java, which have been excluded?

[kos]

@Rinzwind Plus notice that i specified "Assuming you have followed the tutorial exactly as described in the link", which implies the creation of such folder.

[Rinzwind]

@kos it could also have other versions of Java in /usr/lib/jvm/ and those would be removed as well. Your rm is missing jdk1.8.0/. You should expect users to just copy and paste the commands you provide.

[kos]

@Rinzwind Have you read the post? It states: "Assuming that you have only that installation of java", so it's logical that if that's not the case one shouldn't use those commands.

[Rinzwind]

@jos again: please assume users will just copy and paste commands. You are setting them up for a failure.

[kos]

@Rinzwind Ok, i changed my answer accordingly