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Understanding Server-Side Solutions
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Java EE technologies that can be used to access EIS tier data include the Java Database Connectivity API (JDBC), the Java Persistence API, the J2EE Connector Architecture, and the Java Transaction API (JTA). The exam focuses on JDBC, as detailed in 10.
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CERTIFICATION OBJECTIVE
Understanding Server-Side Solutions
Exam Objective 8.1 Describe at a high level the basic characteristics of: EJB, servlets, JSP, JMS, JNDI, SMTP, JAX-RPC, Web Services (including SOAP, UDDI, WSDL, and XML), and JavaMail. This section discusses the details of the interrelated mail technologies SMTP and the JavaMail API, JAX-RPC, and web services. When completed, you will have a very good high-level understanding of these server-side technologies. Servlets and JSPs are covered in a later section of this chapter, Understanding Dynamic Web Content Solutions. EJBs, meanwhile, are also covered later in this chapter, Understanding Enterprise Business Logic Solutions. The Java Message Service (JMS) API and Java Naming and Directory Interface (JNDI) API are
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Understanding Server-Side Technologies
technologies discussed in 10. The following topics will be covered in the next few subsections:
n Java web services n SMTP and the JavaMail API n Java API for the Java XML-based Remote Procedure Call
Java Web Services
Java web services are XML-based messaging protocols that enable business-tobusiness communications. XML helps achieve the underlying goal of web services, which is to send and receive messages in a standardized format. Java web services were introduced in J2EE 1.4 as part of the Java Web Services Development Pack (JWSDP). The current pack, JWSDP 2.0, can be downloaded and integrated with a web container such as Tomcat, Glassfish Application Server, or the Sun Java System Application Server Platform. JWSDP 2.0 includes the following features:
n JAX-WS Version 2.0 EA (Java API for XML Web Services) n Fast Infoset Version 1.0.1 n Sun Java Streaming XML Parser Version 1.0 EA n XML Digital Signature Version 1.0.1 n XML and Web Services Security Version 2.0 EA2 n JAXB Version 2.0 EA (Java Architecture for XML Binding) n JAXP Version 1.3.1_01 (Java API for XML Processing) n JAXR Version 1.0.8_01 EA (Java API for XML Registries) n JAX-RPC Version 1.1.3_01 EA (Java API for XML-based RPC) n SAAJ Version 1.3 EA (SOAP with Attachments API for Java)
Web services technologies which do not require a web container to run include JAXB, JAXP, JAXR, SAAJ, and the XML Digital Signature. For the SCJA exam, the only related web services technologies you will need to know are XML, JAXRPC (covered in the next section), and the three foundational standards of web services (SOAP, UDDI, and WSDL).
The Extensible Markup Language (XML) is a general-purpose specification used for creating markup languages with the design purposes of transporting and storing data.
Understanding Server-Side Solutions
The XML specification allows for the creation of custom tags in structured text files. Web-based solutions make common use of XML files such as configuration, deployment descriptor, and tag libraries files. Again, XML was designed to structure, store, and/or carry data, not to display data. XML is based on tags that the user must define. When creating tags, the user should name the tags descriptively. The following is an XML example that uses tags from the JavaServer Faces configuration file. When this XML is read with the JSF framework, it associates the tag elements with the code in its framework and performs the necessary functionality. In this example, when the loginSuccess value is returned, the web browser will display the welcome page.
<navigation-rule> <navigation-case> <from-outcome>loginSuccess</from-outcome> <to-view-id>/pages/welcome.jsp</to-view-id> </navigation-case> </navigation-rule>
Simple Object Access Protocol
The Simple Object Access Protocol (SOAP) is a simple XML-based communication protocol used for information exchange within a decentralized and distributed environment. SOAP is used in various situations such as messaging and remote procedure calls. SOAP is made up of three main parts: the envelope, the encoding rules, and the RPC. The envelope is the root XML element that contains the message recipient, message content, and processing information of the message. The encoding rules specify how the data-type instances will be exchanged. The RPCs defines the convention for representing the remote calls and responses. The following listing shows an example of a SOAP message:
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/ soap/envelope/" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/ encoding/"> <SOAP-ENV:Header/> <SOAP-ENV:Body> <s:GetDinnerSpecial xmlns:m="Specified-URI"> <Dish>Shrimp Scampi with Linguini</Dish> </s:GetDinnerSpecial> </SOAP-ENV:Body> </SOAP-ENV:Envelope>
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