Home > Articles > Programming > Java

Like this article? We recommend

Inside the JWSDP

At first glance, the many different APIs and tools available with the JWSDP may seem like an alphabet soup of new and older Java technologies. However, each serves a distinct purpose in integrating Java server-based functionality with the world of Web Services. A look at the major pieces that compose the JWSDP can help to understand the interconnection zone between the tightly coupled computing model of J2EE and the asynchronous, Web-centric computing milieu of the Web.

The JWSDP download, available at http://java.sun.com/webservices/downloads/webservicespack.html, comes with a collection of different technologies that include the following:

  • JAXP: Java API for XML Processing

  • JAX-RPC: Java API for XML-Based RPC

  • JAXM: Java API for XML Messaging

  • JAXR: Java API for XML Registries

  • Java Servlet 2.3

  • JavaServer Pages (JSP 1.2) and the JavaServer Pages Standard Tag Library (JSTL)

  • Apache Tomcat 4.1-dev Container (Tomcat) the reference implementation of the JSP 1.2

  • Java WSDP Registry Server

The JWSDP also includes well-written, comprehensive documentation that is worth the download, even if you aren't immediately interested in building Java-based Web Services.

Figure 1 illustrates the roles played the various pieces of the JWSDP.

Figure 1Figure 1 Java Web Services Pack (JWSDP).

Servlets and JSP technology

Let's begin by looking at Servlets and Java Server Pages (JSPs), the two Java front-end technologies sitting at the boundary between Java servers and the Web. Outside the Web Services world, Servlets and JSPs are the technologies of choice for handling HTTP requests and for building dynamic HTML responses. Servlets support a programmatic approach to incoming Web requests, whereas JSPs (which actually are compiled into Servlets) begin with HTML and provide hooks into Java Bean components to create dynamic content, often via database access.

In the Web Services world, Servlets and JSPs act as the entry point for clients connecting to Web services over HTTP. In the conventional Web, requests come from humans. In the Web Services world, the HTTP requests come from other servers. With Web Services, the task of Servlets and JSPs is to route incoming requests, most commonly to an application running in a J2EE container. However, handling an XML-based Web Service request and generating an XML response requires Java-based support for working with XML and XML messages. That's the role of the Java XML Pack.

Java XML Pack

Java XML Pack is a collection of XML technologies, provided in the JWSDP that allows Java developers to work with industry standards for XML. Included in the Java XML Pack is software to work with SOAP messages (JAXM), process XML data (JAXP), communicate with registries (JAXR), and handle remote procedure calls (XML-RPC). The inclusion of the entire Java XML Pack in the JWSDP as a single download gives the Java developer all the tools needed to integrate XML functionality into Java-based Web Services applications. Let's look at the role of each API.

Java API for XML Messaging (JAXM)

JAXM is the key API for sending and receiving XML messages based on the Simple Object Access Protocol (SOAP) 1.1 and SOAP with attachments. Because SOAP messages are fundamentally one-way transmissions between a sender and receiver, additional layering is necessary to support more complex patterns of request and response. JAXM provides that layering through a Java interface that defines the behavior of JAXM entities called providers, which sit on opposite ends of a connection and communicate with each other on behalf of a sender and receiver. The advantages of using JAXM messaging providers include the following:

  • One-way asynchronous messaging

  • Routing of messages to more than one party

  • Reliable messaging, including guaranteed delivery

JAXM also includes several different ways to generate XML content for SOAP messages. Using the capabilities of JAXP (see the next section), JAXM is able to acquire XML directly from a stream or from a SAX or DOM processing source that contains content as well as instructions for transforming it into an XML document.

Java API for XML Processing (JAXP)

The role of JAXP is to help process XML as it arrives in incoming messages, and to help prepare XML for delivery to clients. With JAXP, developers have the option of processing XML with either the event-based SAX model or with the tree-based DOM. JAXP also provides APIs for transforming XML to other formats using XSLT, the XML transform technology. In handling XML-based Web Services, JAXP is the foundational link for processing the XML data arriving in XML-based SOAP packets.

Java API for XML Registries (JAXR)

Registries play an important role in Web Services as a centralized place to store information about available services. JAXR is the API that provides a uniform and standard Java API for interacting with two important registries: the Universal Description Discovery and Integration (UDDI) registry and the ebXML Registry/Repository. Each registry provides a profile of information about companies and their Web Services by using a well-defined schema and messaging format. JAXR permits Java developers to access registry information in a way that hides low-level details, including schema and messaging formats.

Java API for XML-Based RPC (JAX-RPC)

JAX-RPC enables Java developers to build applications and services that incorporate remote procedure call (RPC) functionality. JAX-RPC makes it possible to embrace the heterogeneity inherent in Web Services by supporting communication with services deployed on different platforms and written in different languages. Technologies such as CORBA, RMI, and DCOM have successfully implemented RPC, but on top of a transport layer that is not immediately interoperable with other layers. In using JAX-RPC, Java developers can rapidly achieve Web Services interoperability based on widely adopted Web standards and protocols.

In the Web Services world, RPC is crucial because what a Web Service really means is the execution of code in a distributed environment. In the XML world, developers represent RPC calls using an XML-based protocol such as one that conforms to the Simple Object Access Protocol (SOAP) 1.1 specification. One of the important aspects of JAX-RPC is its capacity to hide much of the detail associated with SOAP messaging.

InformIT Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from InformIT and its family of brands. I can unsubscribe at any time.


Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

Collection and Use of Information

To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.


Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites, develop new products and services, conduct educational research and for other purposes specified in the survey.

Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.


If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information@informit.com.

Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

Other Collection and Use of Information

Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

Cookies and Related Technologies

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.


Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.


This site is not directed to children under the age of 13.


Pearson may send or direct marketing communications to users, provided that

  • Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
  • Such marketing is consistent with applicable law and Pearson's legal obligations.
  • Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
  • Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information

If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.


Users can always make an informed choice as to whether they should proceed with certain services offered by InformIT. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.informit.com/u.aspx.

Sale of Personal Information

Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

Supplemental Privacy Statement for California Residents

California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure

Pearson may disclose personal information, as follows:

  • As required by law.
  • With the consent of the individual (or their parent, if the individual is a minor)
  • In response to a subpoena, court order or legal process, to the extent permitted or required by law
  • To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
  • In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
  • To investigate or address actual or suspected fraud or other illegal activities
  • To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
  • To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
  • To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.


This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact

Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice

We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020