CentOS 7
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Tomcat 9 : Java Application Server
2017/09/23
 
Install Tomcat 9 to configure Java Application Server.
[1]
Install JDK, refer to here.
[2] Install Tomcat 9. Make sure the latest one and download it from the site below.
⇒ http://ftp.riken.jp/net/apache/tomcat/tomcat-9/
[root@dlp ~]#
curl -O http://ftp.riken.jp/net/apache/tomcat/tomcat-9/v9.0.0.M27/bin/apache-tomcat-9.0.0.M27.tar.gz

[root@dlp ~]#
tar zxvf apache-tomcat-9.0.0.M27.tar.gz

[root@dlp ~]#
mv apache-tomcat-9.0.0.M27 /usr/libexec/tomcat9

[root@dlp ~]#
useradd -M -d /usr/libexec/tomcat9 tomcat

[root@dlp ~]#
chown -R tomcat. /usr/libexec/tomcat9
[3] Create a Systemd Setting file.
[root@dlp ~]#
vi /usr/lib/systemd/system/tomcat9.service
# create new

[Unit]
Description=Apache Tomcat 9
After=network.target

[Service]
Type=oneshot
ExecStart=/usr/libexec/tomcat9/bin/startup.sh
ExecStop=/usr/libexec/tomcat9/bin/shutdown.sh
RemainAfterExit=yes
User=tomcat
Group=tomcat

[Install]
WantedBy=multi-user.target
[root@dlp ~]#
systemctl start tomcat9

[root@dlp ~]#
systemctl enable tomcat9

[4] 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.
[5] Create a test servlet that shows current day and time and make sure if it works normally.
[root@dlp ~]#
mkdir /usr/libexec/tomcat9/webapps/ROOT/WEB-INF/classes

[root@dlp ~]#
chown tomcat. /usr/libexec/tomcat9/webapps/ROOT/WEB-INF/classes

[root@dlp ~]#
cd /usr/libexec/tomcat9/webapps/ROOT/WEB-INF/classes

[root@dlp 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 classes]#
javac -classpath /usr/libexec/tomcat9/lib/servlet-api.jar daytime.java

[root@dlp classes]#
vi /usr/libexec/tomcat9/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>
[6] Access to [http://(server's hostname or IP address):8080/daytime] to make sure it works normally.
[7] 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 ~]#
vi /etc/httpd/conf.d/proxy_ajp.conf
# add follows to the end

ProxyPass /tomcat9/ ajp://localhost:8009/
[root@dlp ~]#
systemctl restart httpd

[8] Access to [http://(server's hostname or IP address)/tomcat9/] and make sure it works normally.
 
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