SmallWorld Documentation for Future Developer

Written by Jennifer Young on April 23, 2019

Install and Set Up on TomCat

Step 1: Check the CentOS version and Java version

SmallWorld currently runs on n-9-22, which runs CentOS 6.10. You can check the version of CentOS with the following command:

   cat /etc/centos-release

Check your current version of Java with the following command:

   java -version

If you do not have the correct version, install it using yum. Follow the steps on this tutorial https://www.itzgeek.com/how-tos/linux/centos-how-tos/install-apache-tomcat-7-0-on-rhel-6-centos-6.html

Step 2: Create Tomcat Service Account

This must be done as a root user and has already been done for n-9-22.

   groupadd tomcat
   mkdir /opt/tomcat
   useradd -g tomcat -d /opt/tomcat tomcat

Step 3: Create Initialization Script to Control Apache TomCat

Download the latest version of Apache TomCat from the website https://tomcat.apache.org/download-90.cgi

   vi /etc/init.d/tomcat9

Copy the bash script from here https://www.itzgeek.com/how-tos/linux/centos-how-tos/install-apache-tomcat-7-0-on-rhel-6-centos-6.html

How to Restart the TomCat Server

   service tomcat9 restart

How to Restart the SmallWorld WebApp

You do not need to restart Tomcat every time you want to restart SmallWorld. The TomCat GUI is available at

You need the tunnel to access the private network or this link will not work! Also, the admin username and password is required.

   http://10.20.9.22:8080/

In the Manager App, in the Applications section, use the Stop and Start buttons for the sw-ws app to restart the SmallWorld server

Set Environment Variable for Anonymous Graphs for TomCat

The file to modify is

   opt/tomcat/bin/catalina.sh

Add the following command to the top of the file (below the comments at the top_

   export SWDIR=/srv/db4

Modifying the Amount of Memory Allocated to SmallWorld

The memory allocated to TomCat is found in

   /opt/tomcat/bin/catalina.sh

Add the following commands to the top of the file (below the comments at the top)

   export CATALINA_OPTS="$CATALINA_OPTS -Xms80g"
   export CATALINA_OPTS="$CATALINA_OPTS -Xmx80g"
   export CATALINA_OPTS="$CATALINA_OPTS -XX:MaxPermSize=70g"

Modifying the SmallWorld GUI

The files for the SmallWorld WebApp live in

   /opt/tomcat/webapps/sw-ws

Edit the files in

   /opt/tomcat/webapps/sw-ws/WEB-INF

To add the link to go to ZINC from the SmallWorld results page, edit the swsearch.js JavaScript file

   /opt/tomcat/webapps/sw-ws/WEB-INF/static/swsearch.js