Android Studio 'tools.jar' file is not present in classpath

Question

I downloaded the current version of Android Studio (latest as of 4th July 2013) I also downloaded the JDK version 7u25.

However, it displays error after startup: Please ensure JAVA_HOME points to JDK rather than JRE.

I don't know how to solve this problem, which won't let me run the IDE. I would appreciate any help.

Answer 1

Check if java JDK is installed correctly

dpkg --list | grep -i jdk 

if not install JDK

sudo add-apt-repository ppa:webupd8team/java sudo apt-get update && sudo apt-get install oracle-jdk7-installer 

After the installation you have enable the jdk

update-alternatives --display java 

Check if Ubuntu uses Java JDK 7

java -version 

If all went right the answer should be something like this:

java version “1.7.0_25″ Java(TM) SE Runtime Environment (build 1.7.0_25-b15) Java HotSpot(TM) Server VM (build 23.3-b01, mixed mode) 

Check what compiler is used

javac -version 

It should show something like this

javac 1.7.0_25 

Add JAVA_HOME to environment variable

Edit /etc/environment and add JAVA_HOME=/usr/lib/jvm/java-7-oracle to the end of the file

sudo nano /etc/environment 

Append to the end of the file

JAVA_HOME=/usr/lib/jvm/java-7-oracle 

Log in and out (or reboot) for the changes to take effect.

If you want to remove oracle JDK

sudo apt-get remove oracle-jdk7-installer