How to change Tomcat to use JDK 7

The current environment is using Tomcat 7 + JDK 6. How to configure Tomcat to use JDK 7?

Environment

1. Tomcat 7 (apt-get install)
2. Debian 7.5
3. JDK 6 and JDK 7

P.S Tomcat 7 is installed via apt-get

1. Solution

Update the JAVA_HOME in this file /etc/default/tomcat7

1.1 Edit /etc/default/tomcat7, update JAVA_HOME

$ sudo vim /etc/default/tomcat7 

#...
# The home directory of the Java development kit (JDK). You need at least
# JDK version 1.5. If JAVA_HOME is not set, some common directories for
# OpenJDK, the Sun JDK, and various J2SE 1.5 versions are tried.
#JAVA_HOME=/usr/lib/jvm/openjdk-6-jdk
JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64
#...

1.2 Restart Tomcat, done.

$ sudo service tomcat7 restart

1.3 Check this article to find out which JDK is used by Tomcat.

#...Wrong, SPACE
JAVA_HOME = /usr/lib/jvm/java-7-openjdk-amd64
#...Correct
JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64

From：一号门