"Please ensure you have JAVA_HOME points to JDK rather than JRE" message

Question

I have java installed

aaa@ubuntu:~$ whereis java
java: /usr/bin/java /usr/bin/X11/java /usr/local/java /usr/share/java
aaa@ubuntu:~$ whereis javac
javac: /usr/bin/javac /usr/bin/X11/javac

and etc/profile

JAVA_HOME=/usr/local/java/jdk1.7.0_17
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
JRE_HOME=/usr/local/java/jre1.7.0_17
PATH=$PATH:$HOME/bin:$JRE_HOME/bin
export JAVA_HOME
export JRE_HOME
export PATH

However, when I run Android Studio, it says:

tools.jar in not in Android Studio classpath. Please ensure you have JAVA_HOME points 
to JDK rather than JRE.

How do I fix it?

update

sudo update-alternatives --get-selections | grep ^java 
java                           manual   /usr/local/java/jre1.7.0_17/bin/java
javac                          manual   /usr/local/java/jdk1.7.0_17/bin/javac
javaws                         manual   /usr/local/java/jre1.7.0_17/bin/javaws


java -version
java version "1.7.0_17"

Solution

You have to use the jre version in the jdk, you can do so by executing

    sudo update-alternatives --set java /usr/local/java/jdk1.7.0_17/jre/bin/java
    sudo update-alternatives --set javaws /usr/local/java/jdk1.7.0_17/jre/bin/javaws

Normally this can be done by using update-java-alternatives with a .jinfo file, but for some reason you can't find them on your system.

Comments

[Alex Malex]

echo java_home gives me /usr/local/java/jdk1.7.0_17

[Sajesh Kumar]

You should have .jinfo files, but I have updated my answer to set the update alternatives without them.

[Alex Malex]

java version "1.7.0_17" but I didn't do what you suggested me. do I need it?

[Alex Malex]

which java -- /usr/bin/java

[Alex Malex]

I updated my topic4

[Alex Malex]

I mean, I cannot launch it. ls /usr/lib/jvm/.*.jinfo -- No such file or directory

[Sajesh Kumar]

try sudo updatedb and when it's done locate *.jinfo

[Sajesh Kumar]

doesn't give you any output?

[Sajesh Kumar]

@DmitryShvedov Please have a look at askubuntu.com/questions/388593/setup-jdk-for-android-studio (most likely the version numbers are now different)