Deploying a Java Application on Apache Tomcat: A Step-by-Step Guide

1.Commands To Setup Tomcat :

##################----INSTALL TOMCAT----##################
cd /opt
sudo wget https://archive.apache.org/dist/tomcat/tomcat-9/v9.0.65/bin/apache-tomcat-9.0.65.tar.gz
sudo tar -xvf apache-tomcat-9.0.65.tar.gz

cd /opt/apache-tomcat-9.0.65/conf
sudo vi tomcat-users.xml
# ---add-below-line at the end (2nd-last line)----
# <user username="admin" password="admin1234" roles="admin-gui, manager-gui"/>

sudo ln -s /opt/apache-tomcat-9.0.65/bin/startup.sh /usr/bin/startTomcat
sudo ln -s /opt/apache-tomcat-9.0.65/bin/shutdown.sh /usr/bin/stopTomcat

sudo vi /opt/apache-tomcat-9.0.65/webapps/manager/META-INF/context.xml

comment:
<!-- Valve className="org.apache.catalina.valves.RemoteAddrValve"
  allow="127\.\d+\.\d+\.\d+|::1|0:0:0:0:0:0:0:1" /> -->

sudo vi /opt/apache-tomcat-9.0.65/webapps/host-manager/META-INF/context.xml

comment:
<!-- Valve className="org.apache.catalina.valves.RemoteAddrValve"
  allow="127\.\d+\.\d+\.\d+|::1|0:0:0:0:0:0:0:1" /> -->

sudo stopTomcat
sudo startTomcat

2.Install java application & maven & git

sudo yum install java -y
sudo yum install maven -y 
sudo yum install git -y

3:Git clone from url

git clone https://github.com/jaiswaladi246/Petclinic.git

4: Go to code directory (petclinic) & build war file using maven

cd petclinic
mvn clean package 
# war file is created on /home/ec2-user/Petclinic/target/petclinic.war
# then cp the war file on webapps (/opt/apache-tomcat-9.0.65/webapps/)
cp /home/ec2-user/Petclinic/target/petclinic.war /opt/apache-tomcat-9.0.65/webapps/
# also check the webapps directory permission

5. start tomcat

    sudo startTomcat
    # check through public url on port 8080
    http://35.xxx.69.xx:8080/petclinic/
   

   Final result: