Web Component Development Using Servlet & JSP Technologies (EE6) - Chapter 13 - Deploying J2EE Application to Cloud

Web Component Development
with Servlet & JSP Technologies
(EE 6)
Module-13: Deploying J2EE Application to Cloud

www.webstackacademy.com
Objectives
Upon completion of this module, you should be able to:
● What is Cloud?
● Types of Cloud.
● Cloud Sevice Models.
● Advantages of Cloud-Computing.
● What is Web Service?
● Types of Web Services.
● Building Web services with JAX-WS
● Deploy JAX-WS web services on Tomcat
● AWS (Amazon Web Service)
● AWS and Normal Web Hosting Service
● AWS Architecture

Relevance
Discussion –

What is Cloud?
● Cloud Computing is a general term used to describe a
new class of network based computing that takes place
over the Internet ,
- a collection/group of integrated and networked
hardware, software and Internet Infrastructure (called a
plateform).
- Using the internet for communication and transport
provides hardware ,software and networking services to
clients.
● These services hide the compexity and details of the
underlying infrastructure from users and applications by
providing Application Programming Interface.

What is Cloud?
SERVERS
Shared pool of configurable computing resources
● On-demand network access
● Provisioned by the Service Provider

Types of Cloud
● Public Cloud :- Public cloud allows the accessibility of systems and
services easily to general public. Eg. Amazon , IBM , Microsoft
,Google etc.
● Private Cloud :- Private cloud allows the accessibility of systems and
services within organization.
● Hybrid Cloud :- Hybrid Cloud is the mixture of public and private
cloud. Non critical activities are performed by public cloud and critical
activities are performed by private cloud.

Cloud Service Models
Software as a
Service (SaaS)
Platform as a
Service (PaaS)
Infrastructure as a
Service (IaaS)

Advantages of Cloud
● Lower Cost Computers for users - In Cloud , we don't
require a high-powered computer to run cloud computing's
web based applications because applications run on cloud
not on desktop PC or laptop.
● Lower IT infrastructure cost - By using cloud computing ,
we don't need to invest in larger numbers of more powerful
servers ,not require IT staff also for handling such powerful
servers.
● Lower Software Cost - It reduces the software cost
because we don't need to purchase separate software
packages fo each computer in the organization.

Advantages of Cloud
● Instant Software updates – Another software related
advantage in cloud computing is that users don't need to
face with the choice between obsolete software and high
upgrade costs . If the app is web-based , updates happen
automatically and are available next time when the user
logs in to the cloud.
● Increased Computing Power – The execution capacity
of cloud servers are very high. It processes the
application very fast.
● Unlimited storage capacity - Cloud offers a huge
amount of storage capacity like 2000GB or more than that
if required.

Web Services
A Web Service can be defined in following ways :
● is a client server application or application component for
communication.
● method of communication between two devices over network.
● is a software system for interoperable machine to machine
communication.
● is a collection of standards or protocols for exchanging
information between two devices or application.

Types of Web Services
There are two types of Web Services:
1) Soap Web Services
2) RESTful Web Services

Soap Web Services
Soap web services use XML messages that follow the
Simple Object Access Protocol (SOAP) standard , an XML
language defining a message architecture and message
formats. Such system often contain a machine -readable
description of the opeations offered by the service, written in
the Web Services Description Language(WSDL) , an XML
lanaguage for defining interface syntactically.

RESTful Web Services
In Java EE 6 , JAX-RS provides the functionality for
Representational State Transfer(RESTful) web services.
RESTful web services often better integrated with HTTP than
SOAP-based services are , do not require XML messages or
WSDL service -API definitions.
RESTful web services use existing W3C and internet
Engineering Task Force (IETF) standards (HTTP , XML ,URI
,MIME) and have a lightweight infrastructure that allows services
to be built with minimal tooling ,devloping RESTful services is
inexpensive.

SOAP & RESTful Web
Service

Building Web services
with JAX-WS
JAX-WS allows developers to write message-oriented as
well as Remote Procedure Call-oriented(RPC -oriented)
web services.
The starting point for developing a JAX-WS web service
is a java class annoted javax.jws.WebService annotation.
The @ WebService annotation defines the web service
endpoint.
A service endpoint interface or service endpoint
Implementation (SEI) is a java class ,that declares the
methods that a client can invoke on the service. An
interface is not required when building a JAX-WS
endpoint.

Deploy JAX-WS web
services on Tomcat
Steps of a web service deployment
● Create a web service
● Create a sun-jaxws.xml , defines web service implementation class
● Create a standard web.xml ,defines WSServletContextLitener
,WSServlet and structure of a web project.
● Build tool to generate WAR file.
● Copy JAX-WS dependencies to “${Tomcat}/lib” folder.
● Copy WAR to “${Tomcat}/webapp” folder.
● Start it.

Creating Web Service
File : HelloWeb.java
package com.emertxe.ws;
import javax.jws.WebMethod;
import javax.jws.WebService;
import javax.jws.soap.SOAPBinding;
import javax.jws.soap.SOAPBinding.Style;
//Service Endpoint Interface
@WebService
@SOAPBinding(style = Style.RPC)
public interface HelloWeb{
@WebMethod String getHelloWebAsString();
}

Creating Web Service
File : HelloWebImpl.java
package com.emertxe.ws;
import javax.jws.WebService;
//Service Implementation Bean
@WebService(endpointInterface = "com.emertxe.ws.HelloWeb")
public class HelloWebImpl implements HelloWeb{
@Override
public String getHelloWebAsString() {
return "Hello Web JAX-WS";
}
}

Create a web service deployment
descriptor
File : sun-jaxws.xml
<?xml version="1.0" encoding="UTF-8"?>
<endpoints
xmlns="http://java.sun.com/xml/ns/jax-ws/ri/runtime"
version="2.0">
<endpoint
name="HelloWeb"
implementation="com.emertxe.ws.HelloWebImpl"
url-pattern="/hello"/>
</endpoints>

web.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems,
Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/j2ee/dtds/web-app_2_3.dtd">
<web-app>
<listener>
<listener-class>
com.sun.xml.ws.transport.http.servlet.WSServletContextListener
</listener-class>
</listener>

<servlet>
<servlet-name>hello</servlet-name>
<servlet-class>
com.sun.xml.ws.transport.http.servlet.WSServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>hello</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>120</session-timeout>
</session-config>
</web-app>
web.xml

WAR Content
WEB-INF/classes/com/emertxe/ws/HelloWeb.class
WEB-INF/classes/com/emertxe/ws/HelloWebImpl.class
WEB-INF/web.xml
WEB-INF/sun-jaxws.xml

JAX-WS
Dependencies
Go here http://jax-ws.java.net/.
copy following JAX-WS dependencies to Tomcat library
folder “{$TOMCAT}/lib“.
jaxb-impl.jar
jaxws-api.jar
jaxws-rt.jar
gmbal-api-only.jar
management-api.jar
stax-ex.jar
streambuffer.jar
policy.jar

Deployment
Copy the generated WAR file to {$TOMCAT}/webapps/ folder
and start the Tomcat server.
For testing, access this URL :
http://localhost:8080/HelloWeb/hello

AWS (Amazon Web
Service)
● AWS is a subsidiary of Amazon.com ,offers a suite
of cloud computing services that make up an on-
demand computing plateform.
● The most central and best-known of these
services include Amazon Elastic Compute Cloud ,
also known as “EC2” and Amazon Simple Storage
Service, also known as “S3”.

AWS (Amazon Web
Service)
● Amazon Web Services offers a broad set of global cloud-
based products including storage , database ,analytics,
networking ,mobile, developer tools ,management tools,
security, compute and enterprise applications.
● These services help organizations move faster , lower IT
costs and scale .
● AWS is trusted by the largest enterprises and starts-ups to
power a wide variety of workloads including : web and
mobile applications ,game development ,data processing
and warehousing ,storage ,archieve and many others.

Normal Web Hosting
Service
● Shared :- A physical server that is shared by many
different customers. User account is restricted to certain
files , and very limited access. Usually this web server runs
one Web Server (usually Apache).
● Virtual Private :- Many virtual server are stored on one
physical server. Each Customer has their own private virtual
server.
● Dedicated : A physical server that is leased to a single
customer.

Amazon Web Service
Standard :- AWS allows for dedicated root access to
the server , which is a feature not available in most
virtual private servers.
Dedicated :- Dedicated Amazon will provide a
virtual server that is not on a shared server ,but its own
private cloud . It is similar to a dedicated server , but
with the flexibility of a virtual private server.

Amazon Web Service
advantages over normal
Web Hosting Service
● High -availability (Eliminating Single points of failure)
● Distributed Infrastructure ,reducing latency to all
regions of the world.
● Cost saving ,scaling down on hardware being
used,saving money in the long term.
● On-demand infrastructure for scaling applications
or tasks (adding servers or “horizontal scaling “ to
massively increase the hardware power available to
the application)

AWS Architecture for a
Web App

Web App
● The Web Application tiers runs on EC2( Amazon Elastic
Compute Cloud) instances in VPC.
● Access to the EC2 instances over SSH is controlled by a
security group which acts as a firewall.
● The Autoscaling maintains a fleet of EC2.Auto Scaling group
spans multiple availability Zones to protect against the potential
failureof a single scaling group.
● When the Auto Scaling group launches or terminates instances
based on the load ,the load balancer automatically adjusts
accordingly.

● The database tier consists of DB instances in VPC,
including a master and a local slavelocated in multiple
Availability Zones.
● Access to the DB instances from the EC2 instances is
controlled by a security group.
● Amazon Route 53 provides secure and Reliable routing of
the domain name to infrastructure hosted on AWS.
Web App

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Web Component Development Using Servlet & JSP Technologies (EE6) - Chapter 13 - Deploying J2EE Application to Cloud

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