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I am trying to change the JVM running on Tomcat7 on my Ubuntu 14.04 that is currently running on 1.7.0_121-b00. I currently have 1.8.0_121 version and I would like to use it in the Tomcat7. I have changed the configuration in /etc/default/tomcat7 as follow:

# Run Tomcat as this user ID. Not setting this or leaving it blank will use the
# default of tomcat7.
TOMCAT7_USER=tomcat7

# Run Tomcat as this group ID. Not setting this or leaving it blank will use
# the default of tomcat7.
TOMCAT7_GROUP=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-8-oracle

But when I restart Tomcat7 it gave me the following error

/etc/default/tomcat7: /usr/lib/jvm/java-8-oracle: Permission denied

although I already am a root in this case. Is there something wrong with it?

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CATALINA_HOME is path where tomcat is installed. JAVA_HOME is path to your jdk. For changing the jdk to be used by tomcat you must add the below 2 lines to the bashrc file using editor like 'nano'

$nano ~/.bashrc

In the bashrc file append the below 2 statements:

export JAVA_HOME=/path/to/your/jdk

export CATALINA_HOME=/path/to/your/tomcat

Save and exit out of .bashrc.Changes are effective after restarting the bashrc file.

$source ~/.bashrc

Once we are done with path it’s time to run tomcat And check by typing http://localhost:8080 You must see a tomcat default welcome page.

  • is the CATALINA_HOME will be /usr/share/tomcat7? – Ihsan Haikal Mar 13 '17 at 10:02
  • I don't know into which folder you have installed tomcat. I installed it in /usr/local/tomcat – rohith Mar 13 '17 at 10:04

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