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I have installed tomcat7 (using apt-get install) and whenever I want to start tomcat7 it says :

* no JDK found - please set JAVA_HOME

I have set JAVA_HOME in my bash.bashrc and also in ~/.bashrc and when I issue echo $JAVA_HOME I clearly see that this variable is pointing to my jdk's root folder. Can someone help me with this please?


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This helped me to find where I can tell tomcat7 what JDK to use. –  icedwater Jul 23 '13 at 4:00
Same here. Now I know where tomcat looks for JAVA_HOME. –  slayedbylucifer Oct 28 '13 at 5:40

4 Answers 4

up vote 34 down vote accepted

You can try this:

Just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command below.

gksudo gedit /etc/default/tomcat7

When the file opens, uncomment the line that sets the JAVA_HOME variable.

enter image description here

Save and restart tomcat7 server.

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Note that upgrading to JDK 7 will break this answer. Using a symbolic link without the version number will allow upgrades without invalidating environment variables. –  Dave Jarvis Oct 24 '14 at 19:14

Hit Ctrl+Alt+T to open terminal and run:

sudo gedit /etc/default/tomcat7

Find commented JAVA_HOME, uncomment and change the directory to your JDK environment. No need to restart, and then it's done!

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Tomcat will not actually use your JAVA_HOME environmente variable, but look in some predefined locations and in the JAVA_HOME variable set inside the startup script, as other answers point out. If you don't like messing with the tomcat startup script, you could create a symlink for your preferred java installation, which will be picked up by tomcat.

For example:

ln -s /usr/lib/jvm/java-8-oracle /usr/lib/jvm/default-java
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Just add following line in /etc/default/tomcat7 at where JAVA_HOME variable is defined


then run command

sudo service tomcat7 restart
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