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I am a new user of Linux, it has been recommended to me by my friend.

He told me to install software called IntelliJ Idea IDE.

Well I have been following the tutorial. But now when I try to open "idea.sh", an error message pops-up:

'tools.jar' is not in IDEA classpath.
Please ensure JAVA_HOME points to JDK rather than JRE.

Please remember that I'm new to Ubuntu and I'm planning for a nice long stay once I get myself into it :)

Also I do not know if I am running a correct Java6 JDK. When I do java -version, this is what I get:

java version "1.6.0_23"
OpenJDK Runtime Environment (IcedTea6 1.11pre) (6b23~pre10-0ubuntu5)
OpenJDK 64-Bit Server VM (build 20.0-b11, mixed mode)

Thank You for reading this and I hope I will get a nice response.

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i solved same problem with this answer, maybe help stackoverflow.com/a/17827697/3057033 –  Erol Guzoğlu Dec 24 '13 at 2:51

7 Answers 7

Be sure you have a JDK installed on your system.

sudo apt-get install openjdk-7-jdk

If that does not solve your problem, you must tell your system to use that JDK instead of the current JRE. To do so, you choose which JDK/JRE you use by default on your system by executing the following command in terminal.

sudo update-alternatives --config java

This command will give you a list of alternative java options, which you will then be able select a JDK instead of JRE.

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1  
This is the correct answer. Thanks. –  N Bhargav Dec 30 '13 at 7:39
    
this helped a lot but now I'm getting: tools.jar' seems to be not in IDEA classpath. Please ensure JAVA_HOME points to JDK rather than JRE. –  advocate Mar 21 '14 at 21:33
    
@advocate I saw your comment on SO; you issue has been resolved by reinstalling JDK, correct? –  allejo Mar 22 '14 at 1:10
2  
yup! just sudo apt-get install openjdk-7-jdk –  advocate Mar 23 '14 at 18:32
2  
I had to set the JAVA_HOME path in ~/.bashrc before this worked. –  fuzzyanalysis Oct 3 '14 at 14:25

Try this:

sudo apt-get install openjdk-6-jdk

You need JDK.

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On my Linux Mint environment I've encountered the same problem. I tried to install Oracle JDK8 using

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer

but the problem remained because installer didn't change environment variables. Then I tried the following

sudo apt-get install oracle-java8-set-default

and it solved the problem

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Finally this fixed my problem. Thanks buddy. –  Jagdeep Singh Nov 25 '14 at 14:51
    
Perfect solution for me and also allowed Java 8 use –  Pitto May 5 at 12:45

Try this command

export JAVA_HOME=/usr/lib/jvm/default-java

and run idea.sh again.

Mind you, this only works inside the terminal where you run the command. You will have to set the variable inside .bashrc file. This will enable it on every terminal you open.

StackOverFlow

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i tried this but still got the same error –  Nitesh Verma Dec 8 '14 at 8:31

I've solved this problem with these commands

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer
sudo apt-get install oracle-java8-set-default

and

export JAVA_HOME=/usr/lib/jvm/default-java
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Where do you place the last command export JAVA_HOME=/usr/lib/jvm/default-java you mention? –  MadMike Mar 4 at 6:50

The solution of exporting the JAVA_HOME variable doesn't work for me in Ubuntu. I solved it adding the bin directory to the PATH variable.

I downloaded the JDK from the Oracle website, and I placed it in this directory: /home/alejandro/software/JAVA-descarga/jdk1.8.0_25

Then you have to add that route to the PATH variable:

export PATH=/home/alejandro/software/JAVA-descarga/jdk1.8.0_25/bin/:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games  

Then run the idea.sh file in the same terminal and it will start well.

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The answers above are correct but I have one thing to add. Actually the environment variables for Shell Session and Desktop GUI Session are different (check this). If the error happens when you launch IntelliJ with Desktop Entry(the Launcher), you might don't have JAVA_HOME in your GUI Environment.

So the easiest solution is to add JAVA_HOME in the Exec line of the desktop entry like this:

[Desktop Entry]
Version=1.0
Type=Application
Name=IntelliJ IDEA Community Edition
Icon=/home/zhu/Applications/IntelliJ/bin/idea.png
Exec=env JDK_HOME=/usr/lib/jvm/java-7-openjdk-amd64 "/path/to/idea.sh" %f
Comment=Develop with pleasure!
Categories=Development;IDE;
Terminal=false
StartupWMClass=jetbrains-idea-ce
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