Weaving WebSphere: Secure, Reliable Web Services

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"Gain a modest reputation for being unreliable and you will never be asked to do a thing."
--Paul Theroux

"Web Services." With the possible exception of "object-oriented" and maybe "grid computing," there hasn't been a more promise-laden phrase in Information Technology since "CASE." And while the concept of Web Services hasn't fizzled out like some of its peers (can you say "Extreme Programming"?), it has reached that rather tender age where it has to either put up or shut up. This is the time I like, actually, because it means we can have a frank and open discussion about both the advantages and the drawbacks of the technology without fear of being burned at the stake by the techno-evangelists who have by now leapt upon another bandwagon.

In today's column, I will discuss a couple of developments that may be the first signs of Web Services maturing from promising new technology to real-world tool: message reliability and identity management. The trick will be to describe these things without my head exploding, but that's my problem.

A Little Reminiscing

So, what was the hype about Web Services? Remember back when "Web Services" was the mantra breezing across everyone's lips? Ah yes, the idea was that computers would be able to talk to each other without programming, that they would simply exchange standardized packets of data, thereby allowing them to seamlessly interconnect. Not only that, but services would spring up across the Internet, registered via a central directory and accessible by anyone. Rather than wasting time and money with expensive programmers, you would simply reach out to the 'net whenever you needed some computing done; the Internet would become one vast reservoir of computing services available to you at the turn of a virtual spigot. Even better, you would be able to choose among the many service providers that would be fighting for your business. It was like that television commercial: "When banks compete, you win!"

Sure, there were some pesky details, like who would make sure that the algorithms worked and that the providers would be stable and that the networks would be available. Not to mention annoying little issues like Sarbanes-Oxley and exactly how much of your secure enterprise data would be sent to some unknown entity and what would happen to your business on the day you looked for a required service and nobody was providing it anymore. Those were mere minutiae, factual frippery spoiling a beautiful theory. The fact that people with a lot of experience in the industry were calling Web Services "EDI for XML" and pointing out how long it took EDI to become established was simply a case of sour grapes.

What's Happening Today?

Well, it's now a couple of years later, and Web Services have not yet replaced programmers. But a couple niches are being filled: For example, most stock trading functions are available, from price quotes to lists of insider trades. Free Web Services exist for things like address lookups, while other vendors offer for-fee services ranging from currency conversion to full-blown accounting packages. For example, ObjAcct is quite interesting. As far as I can tell, it's a full-blown accounting system with a Web Services interface that you can "embed" in your own applications. Whether or not these folks make it, the concept of providing access to your enterprise application as a Web Service seems to me to be the next evolutionary step past the idea of Application Service Provider (ASP). Whereas an ASP provides users with access to a centralized application, a Web Services programming interface (WSPI?) provides a programmatic interface from other applications.

If you'd like to peruse the Web Services that are currently available, you might want to visit a few of the larger repositories. For example, has a list of several hundred Web Services from various Web Service Providers (WSPs), while StrikeIron's Global Directory lists over 1,500 (a couple hundred of them are commercial services from StrikeIron itself). is an interesting site that hosts over 70 free services.

Other than this, though, the primary Web Services providers are large companies that want standardized communications not only with their suppliers and customers but also within their own organizations. The perfect example is General Motors, which is basically converting its former EDI model over to Web Services. Rather than sour grapes, EDI replacement is actually the focus of Web Services at this point.

The State of the Technology

So now we come to the sticky part. Without going too deeply into the political infighting surrounding the entire Web Services concept (Microsoft and IBM, joined in a marriage of convenience, are pitted against the rest of the industry, and this struggle has resulted in no fewer than four organizations providing "assistance" with the standards process), it's clear that there is currently no real standard for Web Services and that in fact the industry is becoming more, not less, fractionalized. Here is just a single example: IBM has two separate protocols, Web Services Reliable Messaging (WS-RM) and Web Services Reliability (WS-R), both of which attempt to provide the same basic service through two distinctly different mechanisms. Even though IBM is a founding member of OASIS (the Organization for the Advancement of Structured Information Systems), only one of these protocols, WS-R, is an OASIS standard. And that's not even the confusing part! Here's the bit that makes it nearly surreal: OASIS calls WS-R "Web Services Reliable Messaging." My head hurts.

Where's the SOAP?

Let's consider one more side issue before we get into these new technologies. There is an ongoing struggle between the Simple Object Access Protocol (SOAP) camp and the rest of the world, "rest" being an entirely apropos word since the competing technology is Representational State Transfer, or REST. REST is to SOAP as JavaServer Pages (JSPs) are to Struts, or as Plain Old Java Objects (POJOs) are to Enterprise Java Beans (EJBs). REST is fast, lightweight, easy to use, and easy to program while SOAP is slow, bloated, and difficult to implement without specialized programming tools. As an example, the following listing shows the SOAP equivalent of an acknowledgement (or ACK, which back in the day was a single character):





That's not the whole SOAP message, either. Note the four or five places where an ellipsis is used to indicate more required information. EJBs crumbled under their own weight, and Struts has been replaced (albeit by an even more cumbersome and bloated standard). While SOAP will not die, being supported as it is by IBM and Microsoft, it is still not the global standard and probably won't be the interface of choice any time soon. In fact, one of the largest providers of Web Services,, allows both interfaces, and the last time I checked, over 80% of the requests were REST rather than SOAP.

However, this is edging into the technical side of things, which I hope to cover in a bit more detail in an upcoming issue of iApplication Designer. For the moment, though, the only "official" standards on reliability and security are the OASIS standards, and OASIS is built on SOAP, so let's assume that SOAP is part of your infrastructure.

The Problems and the Proposed Solutions

The big problems in any sort of distributed architecture are straightforward and are as old as the concept of client/server computing, which in turn is nearly as old as data processing itself. Looking at it from the client/server standpoint then, there are two age-old questions. First, the server wants to know whether the client is really who he says he is. Second, the client wants to know whether the server actually processed his request.


Simple authentication is available for just about any Web communication. You see this whenever you go to a Web site and are challenged with a standard HTTP authentication prompt (although those seem to be being replaced with regular Web pages asking for sign-on information). However, that's really the "human on a browser" type of authentication, and it has limitations. For the most part, those limitations can be thought of as confining the width of the transaction.,%20Reliable%20Web%20ServicesV400.jpg

Figure 1: This is the standard human-oriented Web authentication system. (Click images to enlarge.)

Figure 1 shows the standard HTTP authentication scenario used when surfing the Web. The user signs on to the PC and then loads the browser. The browser makes HTTP requests to a remote application, which responds to the request. If authentication is required, it happens at point B and requires human intervention. If multiple requests require authentication, the user would need to key in a user ID and password at each challenge. But since surfing involves getting an entire page of data for each request, even the worst case would typically never require more than one authentication per page. In this scenario, authentication challenges aren't such a burden.,%20Reliable%20Web%20ServicesV401.jpg

Figure 2: In a more automated environment, authentication is propagated along the transaction.

But in a more complex environment, the Web is used less as a human-activated query tool than as a computer-to-computer communications device. A single action by a user on the local workstation could invoke one or more transactions from different computers on the network, which could in turn invoke transactions on yet other computers. Figure 2 shows how the initial authentication created at sign-on time (A) is propagated down the chain to various subsidiary computers (A+). At each point, some sort of token is automatically exchanged between layers, removing the need to go back to the requester to get authentication.

Unlike a standard browser interface, without some method of replicating authentication, the user would be inundated with challenges, including challenges from computers with whom the initial user has no account, making it impossible to provide credentials. So what began as a simple exercise in authenticating a user now becomes a complex task involving authentication, single sign-on, and federation of trust. It is this level of complexity that requires a specification higher than the simple REST architecture, and this is what the various Web Services organizations are trying to address. The WS-Secure, WS-Trust, and WS-Federation standards all play key roles in the conversation depicted in Figure 2.

Reliability Becomes Key

As we have already noted, in the original Web design, the client was always considered to be a human being using a browser. Common sense and the Refresh button were pretty much all that was required to handle any communications problems. And even then you often saw this message on your browser screen: "Do not hit Refresh on this page or your account may be billed twice!" Not particularly comforting, but unless the user was a glutton for punishment, chances were you wouldn't get more than the rare double-post. And even if that did happen, there usually was a human being involved with a vested interest in verifying the transaction.

One of the truths of automation, though, is that your procedures need to be very good: When you have a flaw in your process, the computer can execute that flaw literally hundreds of times a second, and there is no human oversight at the individual transaction level. These flaws can have very serious negative effects. Think about it: If a cancel order request doesn't make it through the system, an unexpected order can be executed. This can result in anything from a double billing for the latest Nickelback ring tone to a delivery of a train car load of hog bellies to an unsuspecting commodities trader.

The standard HTTP protocol has no way of handling this problem, which is why SOAP over HTTP has some inherent difficulties. Although the mechanics of reliable messaging have long been established, they simply weren't incorporated into the simple put/get design of HTTP. HTTP can at best return a response that indicates success or failure, but the response doesn't indicate whether the transaction was successful; it indicates only the status of the communication between the browser and the HTTP server. For example, even though the HTTP server says the transaction was successful, that doesn't mean the server actually completed the transaction embedded in the request. Instead, you need to build some sort of acknowledgement into your application, and the acknowledgement must be sent back to the requester.

This is particularly important for multi-part messages. When a message is so large that it needs to be broken into multiple pieces, it is important to have a way of reliably segmenting a message and reassembling it at the other end of the communication. TCP/IP already has a method to provide reliable transport at the packet level; this concept needs to be reapplied at the larger message level of the Web Service request and response.

Even worse, a failure in the HTTP request doesn't necessarily mean that the message failed! The request could have made it all the way to the server, and then some sort of temporary network problem failed in receiving a response from the serving application. The message could have been processed, but the HTTP server would tell the requester that the request failed. This could cause the requester to re-send the request, which could result in a double posting. Obviously, some method of avoiding duplication needs to be put in place, as well a way of requesting that messages be re-sent.

Note that one possibility to avoid this entire issue is to remove HTTP from the equation and instead use another wire protocol for sending Web Services information. This could remove the Internet from the equation entirely. And for company-specific Web Services (such as communicating with GM), this might actually be an option. I suppose for large corporate providers you could dial in (or otherwise connect) directly to some sort of company-specific Web Services network. But in order to provide this level of interaction between unrelated companies without building an entire alternate communications infrastructure, the Internet and HTTP will probably still need to be the primary transport layer.

The WS-Reliable Messaging standard is the primary player in this effort, and like all of the OASIS standards, is based on SOAP as the underlying message layout.


Right now, there is a technical (and somewhat philosophical) debate being waged about the individual merits of SOAP and REST because both can provide access to basic Web Services. REST is much simpler and does not rely on proprietary tooling. (Make no mistake: The SOAP standards are open, but using them requires proprietary tools.) On the other hand, the big players are building a framework on SOAP that incorporates all the client/server capabilities we've learned over the past four decades of computing, things that a larger vision of completely distributed applications depends upon. These features cannot be added to the HTTP protocol, and the very nature of REST (that is, reliance on underlying services) means that REST will probably never support them. That being the case, there really is no alternative to SOAP and the OASIS Web Services protocols for building complex multi-computer applications using XML over HTTP.

On the other hand, the fact that these features are being hammered out, even if it is only in the SOAP realm, means that the Web Services architecture may finally be able to take its place as a viable replacement not only for EDI and other batch processing designs, but for more dynamic online transaction processing applications. My only disappointment will be that the cumbersome SOAP standard will be dragged along with it.

Joe Pluta is the founder and chief architect of Pluta Brothers Design, Inc. He has been working in the field since the late 1970s and has made a career of extending the IBM midrange, starting back in the days of the IBM System/3. Joe has used WebSphere extensively, especially as the base for PSC/400, the only product that can move your legacy systems to the Web using simple green-screen commands. Joe is also the author of E-Deployment: The Fastest Path to the Web, Eclipse: Step by Step, and WDSC: Step by Step. He will be speaking at Local User Group meetings around the country in March, April, May, and June; you can reach him at This email address is being protected from spambots. You need JavaScript enabled to view it..

Joe Pluta

Joe Pluta is the founder and chief architect of Pluta Brothers Design, Inc. He has been extending the IBM midrange since the days of the IBM System/3. Joe uses WebSphere extensively, especially as the base for PSC/400, the only product that can move your legacy systems to the Web using simple green-screen commands. He has written several books, including Developing Web 2.0 Applications with EGL for IBM i, E-Deployment: The Fastest Path to the Web, Eclipse: Step by Step, and WDSC: Step by Step. Joe performs onsite mentoring and speaks at user groups around the country. You can reach him at

MC Press books written by Joe Pluta available now on the MC Press Bookstore.

Developing Web 2.0 Applications with EGL for IBM i Developing Web 2.0 Applications with EGL for IBM i
Joe Pluta introduces you to EGL Rich UI and IBM’s Rational Developer for the IBM i platform.
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Discover incredibly powerful WDSC with this easy-to-understand yet thorough introduction.
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    Profound Logic Software, Inc.Have you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application. In Part 2, Brian May teaches you the different tooling options available for writing code, debugging, and using Git for version control. Attend this webinar to learn:

    • Different tools to develop Node.js applications on IBM i
    • Debugging Node.js
    • The basics of Git and tools to help those new to it
    • Using as a pre-built development environment



  • Inside the Integrated File System (IFS)

    SB_HelpSystems_WC_GenericDuring this webinar, you’ll learn basic tips, helpful tools, and integrated file system commands—including WRKLNK—for managing your IFS directories and Access Client Solutions (ACS). We’ll answer your most pressing IFS questions, including:

    • What is stored inside my IFS directories?
    • How do I monitor the IFS?
    • How do I replicate the IFS or back it up?
    • How do I secure the IFS?

    Understanding what the integrated file system is and how to work with it must be a critical part of your systems management plans for IBM i.


  • Expert Tips for IBM i Security: Beyond the Basics

    SB PowerTech WC GenericIn this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

    Don't miss this chance to take your knowledge of IBM i security beyond the basics.



  • 5 IBM i Security Quick Wins

    SB PowerTech WC GenericIn today’s threat landscape, upper management is laser-focused on cybersecurity. You need to make progress in securing your systems—and make it fast.
    There’s no shortage of actions you could take, but what tactics will actually deliver the results you need? And how can you find a security strategy that fits your budget and time constraints?
    Join top IBM i security expert Robin Tatam as he outlines the five fastest and most impactful changes you can make to strengthen IBM i security this year.
    Your system didn’t become unsecure overnight and you won’t be able to turn it around overnight either. But quick wins are possible with IBM i security, and Robin Tatam will show you how to achieve them.

  • How to Meet the Newest Encryption Requirements on IBM i

    SB PowerTech WC GenericA growing number of compliance mandates require sensitive data to be encrypted. But what kind of encryption solution will satisfy an auditor and how can you implement encryption on IBM i? Watch this on-demand webinar to find out how to meet today’s most common encryption requirements on IBM i. You’ll also learn:

    • Why disk encryption isn’t enough
    • What sets strong encryption apart from other solutions
    • Important considerations before implementing encryption



  • Security Bulletin: Malware Infection Discovered on IBM i Server!

    SB PowerTech WC GenericMalicious programs can bring entire businesses to their knees—and IBM i shops are not immune. It’s critical to grasp the true impact malware can have on IBM i and the network that connects to it. Attend this webinar to gain a thorough understanding of the relationships between:

    • Viruses, native objects, and the integrated file system (IFS)
    • Power Systems and Windows-based viruses and malware
    • PC-based anti-virus scanning versus native IBM i scanning

    There are a number of ways you can minimize your exposure to viruses. IBM i security expert Sandi Moore explains the facts, including how to ensure you're fully protected and compliant with regulations such as PCI.



  • Fight Cyber Threats with IBM i Encryption

    SB PowerTech WC GenericCyber attacks often target mission-critical servers, and those attack strategies are constantly changing. To stay on top of these threats, your cybersecurity strategies must evolve, too. In this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access




  • 10 Practical IBM i Security Tips for Surviving Covid-19 and Working From Home

    SB PowerTech WC GenericNow that many organizations have moved to a work from home model, security concerns have risen.

    During this session Carol Woodbury will discuss the issues that the world is currently seeing such as increased malware attacks and then provide practical actions you can take to both monitor and protect your IBM i during this challenging time.


  • How to Transfer IBM i Data to Microsoft Excel

    SB_HelpSystems_WC_Generic3 easy ways to get IBM i data into Excel every time
    There’s an easy, more reliable way to import your IBM i data to Excel? It’s called Sequel. During this webinar, our data access experts demonstrate how you can simplify the process of getting data from multiple sources—including Db2 for i—into Excel. Watch to learn how to:

    • Download your IBM i data to Excel in a single step
    • Deliver data to business users in Excel via email or a scheduled job
    • Access IBM i data directly using the Excel add-in in Sequel

    Make 2020 the year you finally see your data clearly, quickly, and securely. Start by giving business users the ability to access crucial business data from IBM i the way they want it—in Microsoft Excel.



  • HA Alternatives: MIMIX Is Not Your Only Option on IBM i

    SB_HelpSystems_WC_GenericIn this recorded webinar, our experts introduce you to the new HA transition technology available with our Robot HA software. You’ll learn how to:

    • Transition your rules from MIMIX (if you’re happy with them)
    • Simplify your day-to-day activities around high availability
    • Gain back time in your work week
    • Make your CEO happy about reducing IT costs

    Don’t stick with a legacy high availability solution that makes you uncomfortable when transitioning to something better can be simple, safe, and cost-effective.



  • Node Webinar Series Pt. 1: The World of Node.js on IBM i

    SB Profound WC GenericHave you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application.
    Part 1 will teach you what Node.js is, why it's a great option for IBM i shops, and how to take advantage of the ecosystem surrounding Node.
    In addition to background information, our Director of Product Development Scott Klement will demonstrate applications that take advantage of the Node Package Manager (npm).
    Watch Now.

  • The Biggest Mistakes in IBM i Security

    SB Profound WC Generic The Biggest Mistakes in IBM i Security
    Here’s the harsh reality: cybersecurity pros have to get their jobs right every single day, while an attacker only has to succeed once to do incredible damage.
    Whether that’s thousands of exposed records, millions of dollars in fines and legal fees, or diminished share value, it’s easy to judge organizations that fall victim. IBM i enjoys an enviable reputation for security, but no system is impervious to mistakes.
    Join this webinar to learn about the biggest errors made when securing a Power Systems server.
    This knowledge is critical for ensuring integrity of your application data and preventing you from becoming the next Equifax. It’s also essential for complying with all formal regulations, including SOX, PCI, GDPR, and HIPAA
    Watch Now.

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  • Backup and Recovery on IBM i: Your Strategy for the Unexpected

    SB HelpSystems SC 5413Robot automates the routine tasks of iSeries backup and recovery, saving you time and money and making the process safer and more reliable. Automate your backups with the Robot Backup and Recovery Solution. Key features include:
    - Simplified backup procedures
    - Easy data encryption
    - Save media management
    - Guided restoration
    - Seamless product integration
    Make sure your data survives when catastrophe hits. Try the Robot Backup and Recovery Solution FREE for 30 days.

  • Manage IBM i Messages by Exception with Robot

    SB HelpSystems SC 5413Managing messages on your IBM i can be more than a full-time job if you have to do it manually. How can you be sure you won’t miss important system events?
    Automate your message center with the Robot Message Management Solution. Key features include:
    - Automated message management
    - Tailored notifications and automatic escalation
    - System-wide control of your IBM i partitions
    - Two-way system notifications from your mobile device
    - Seamless product integration
    Try the Robot Message Management Solution FREE for 30 days.

  • Easiest Way to Save Money? Stop Printing IBM i Reports

    SB HelpSystems SC 5413Robot automates report bursting, distribution, bundling, and archiving, and offers secure, selective online report viewing.
    Manage your reports with the Robot Report Management Solution. Key features include:

    - Automated report distribution
    - View online without delay
    - Browser interface to make notes
    - Custom retention capabilities
    - Seamless product integration
    Rerun another report? Never again. Try the Robot Report Management Solution FREE for 30 days.

  • Hassle-Free IBM i Operations around the Clock

    SB HelpSystems SC 5413For over 30 years, Robot has been a leader in systems management for IBM i.
    Manage your job schedule with the Robot Job Scheduling Solution. Key features include:
    - Automated batch, interactive, and cross-platform scheduling
    - Event-driven dependency processing
    - Centralized monitoring and reporting
    - Audit log and ready-to-use reports
    - Seamless product integration
    Scale your software, not your staff. Try the Robot Job Scheduling Solution FREE for 30 days.

  • ACO MONITOR Manages your IBM i 24/7 and Notifies You When Your IBM i Needs Assistance!

    SB DDL Systems 5429More than a paging system - ACO MONITOR is a complete systems management solution for your Power Systems running IBM i. ACO MONITOR manages your Power System 24/7, uses advanced technology (like two-way messaging) to notify on-duty support personnel, and responds to complex problems before they reach critical status.

    ACO MONITOR is proven technology and is capable of processing thousands of mission-critical events daily. The software is pre-configured, easy to install, scalable, and greatly improves data center efficiency.