JDK not recognized after installation in Ubuntu 12.10

Question

I did these steps without error:

JDK path :
```
Downloads/jdk-6u37-linux-x64.bin
```

Commands in Terminal:

mkdir Programs
cd Programs
bash ../Downloads/jdk-6u37-linux-x64.bin
ln -s jdk-6u37-linux-x64 jdk

Set JAVA_HOME and Path:

I added the following lines to the end of the .bashrc file:
```
export JAVA_HOME=$Home/Programs/jdk
export PATH=:$JAVA_HOME/bin:$PATH
```

This is the result of executing the command echo $JAVA_HOME:

/Programs/jdk

This is the result of executing the command echo $PATH:

:/Programs/jdk/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games1

And the problem is:
This is the result of executing the command

$ java -version

The program 'java' can be found in the following packages:
 * default-jre
 * gcj-4.6-jre-headless
 * gcj-4.7-jre-headless
 * openjdk-7-jre-headless
 * openjdk-6-jre-headless
Try: sudo apt-get install

just re-install it , might have missed some file , it should work for you :) — thar45, Nov 06 '12 at 12:55
The easiest way would be to get an official ubuntu package, on my side I'm using Slackware but to get custom JDK package I use official compilation scripts... Ubuntu have already up to date packages so why not just use them? — Alexandre Lavoie, Nov 06 '12 at 13:01
Oh, and lose the first `:` in `export PATH=:$JAVA_HOME/bin:$PATH` — Anders R. Bystrup, Nov 06 '12 at 13:07

Anders R. Bystrup · Accepted Answer · 2012-11-06T13:19:20.570

1

I think the problem is that environment variables are case sensitive in linux, so your

export JAVA_HOME=$Home/Programs/jdk

Should be

export JAVA_HOME=$HOME/Programs/jdk

In your echo $JAVA_HOME output you can see that you don't get your /home/yourname prepended...

Hope that helps.

Cheers,

edited Nov 06 '12 at 13:19

answered Nov 06 '12 at 13:08

Anders R. Bystrup

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Thanks. ‌But Why is this form ? My home folder is exactly Home, not HOME. – HFDev Nov 09 '12 at 13:46
1

$HOME is the environment variable _representing_ your home directory, not the directory itself. – Anders R. Bystrup Nov 09 '12 at 14:39

score 1 · Answer 2 · answered Nov 06 '12 at 13:17

1

The scripts located here will help you install sun's jdk on Ubuntu. Really useful stuff.

answered Nov 06 '12 at 13:17

BillRobertson42

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Is this just a software repository for easier Download and access to the JDK? Do I understand correctly? – HFDev Nov 09 '12 at 13:53
The scripts download the jdk from Sun, then they do some apt magic to package them for apt, then you just run an apt upgrade (or update?) and it will set them up for you. Good stuff. – BillRobertson42 Nov 12 '12 at 07:12

score 0 · Answer 3 · answered Aug 09 '14 at 06:46

try this command

sudo update-alternatives --config java

This will list all the Java versions installed and configured.

If you see one or more installs, it will give you a list each element starting with a number. Just choose the number that corresponds to the version you want to use by default.

JDK not recognized after installation in Ubuntu 12.10

3 Answers3