Tomcat 8 : JAVA Application Server2016/06/19

	Install Tomcat 8 to configure JAVA Application Server.
[1]	Install JDK, refer to here.
[2]	Install Tomcat 8. Make sure the latest one and download it from the site below. ⇒ http://ftp.riken.jp/net/apache/tomcat/tomcat-8/

root@dlp:~#

curl -O http://ftp.riken.jp/net/apache/tomcat/tomcat-8/v8.5.3/bin/apache-tomcat-8.5.3.tar.gz

root@dlp:~#

tar zxvf apache-tomcat-8.5.3.tar.gz

root@dlp:~#

mv apache-tomcat-8.5.3 /usr/tomcat8

root@dlp:~#

useradd -M -d /usr/tomcat8 tomcat8

root@dlp:~#

chown -R tomcat8. /usr/tomcat8

# start (specify shutdown.sh to stop)

root@dlp:~#

su - tomcat8 -c /usr/tomcat8/bin/startup.sh

Using CATALINA_BASE:   /usr/tomcat8
Using CATALINA_HOME:   /usr/tomcat8
Using CATALINA_TMPDIR: /usr/tomcat8/temp
Using JRE_HOME:        /usr/java/jdk1.8.0_91
Using CLASSPATH:       /usr/tomcat8/bin/bootstrap.jar:/usr/tomcat8/bin/tomcat-juli.jar
Tomcat started.

[3]	Start a Web browser on localhost or clients on the network and access to "http://(server's hostname or IP address):8080/", then Tomcat default site is displayed like follows.

[4]	Create a test servlet that shows current day and time and make sure if it works normally.

root@dlp:~#

mkdir /usr/tomcat8/webapps/ROOT/WEB-INF/classes

root@dlp:~#

chown tomcat8. /usr/tomcat8/webapps/ROOT/WEB-INF/classes

root@dlp:~#

cd /usr/tomcat8/webapps/ROOT/WEB-INF/classes

root@dlp:/usr/tomcat8/webapps/ROOT/WEB-INF/classes#

vi daytime.java

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.Calendar;

public class daytime extends HttpServlet {
    public void doGet(HttpServletRequest request
    ,HttpServletResponse response)

    throws IOException, ServletException{
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        Calendar cal = Calendar.getInstance();
        out.println("<html>\n<head>\n<title>DayTime</title>\n</head>\n<body>");
        out.println("<div style=\"font-size: 40px; text-align: center; font-weight: bold\">");
        out.println(cal.get(Calendar.YEAR) + "/" + (cal.get(Calendar.MONTH) + 1) + "/" + 
        cal.get(Calendar.DATE) + " " + cal.get(Calendar.HOUR_OF_DAY) + ":" + cal.get(Calendar.MINUTE));
        out.println("</div>\n</body>\n</html>");
    }
}

root@dlp:/usr/tomcat8/webapps/ROOT/WEB-INF/classes#

javac -classpath /usr/tomcat8/lib/servlet-api.jar daytime.java

root@dlp:/usr/tomcat8/webapps/ROOT/WEB-INF/classes#

vi /usr/tomcat8/webapps/ROOT/WEB-INF/web.xml

# add follows between <web-app> - </web-app>

  <servlet>
     <servlet-name>daytime</servlet-name>
     <servlet-class>daytime</servlet-class>
  </servlet>
  <servlet-mapping>
     <servlet-name>daytime</servlet-name>
     <url-pattern>/daytime</url-pattern>
  </servlet-mapping>

[5]	Access to "http://(server's hostname or IP address):8080/daytime" to make sure it works normally.

[6]	If you'd like to access without specifying 8080, configure with Apache http server liek follows. Therefore, Install and start Apache http server first.

root@dlp:~#

a2enmod proxy_ajp

Considering dependency proxy for proxy_ajp:
Enabling module proxy.
Enabling module proxy_ajp.
To activate the new configuration, you need to run:
service apache2 restart

root@dlp:~#

vi /etc/apache2/conf-available/proxy_ajp.conf

# create new

ProxyPass /tomcat8/ ajp://localhost:8009/

root@dlp:~#

a2enconf proxy_ajp

Enabling conf proxy_ajp.
To activate the new configuration, you need to run:
service apache2 reload
root@dlp:~#

systemctl restart apache2

[7]	Access to "http://(server's hostname or IP address)/tomcat8/" and make sure it works normally.

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