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  Think Big – Now Think Even Bigger
  Join Us at Internet of Things at Cloud Expo, November 11-13,
at the Javits Center!


The Internet of Things (IoT) is the most profound change in personal and enterprise IT since the creation of the Worldwide Web more than 20 years ago.

All major researchers estimate there will be tens of billions devices - computers, smartphones, tablets, and sensors - connected to the Internet by 2020. This number will continue to grow at a rapid pace for the next several decades.

With major technology companies and startups seriously embracing IoT strategies, now is the perfect time to attend Internet of Things at Cloud Expo in New York City. Learn what is going on, contribute to the discussions, and ensure that your enterprise is as "IoT-Ready" as it can be!

Delegates to Internet of Things at Cloud Expo will be able to attend eight separate, information-packed tracks:

  • Enterprise Cloud
  • Digital Transformation
  • The API Enterprise | Mobility & Security
  • DevOps | Containers & Microservices
  • Cognitive Computing | AI, ML, DL
  • Big Data | Analytics
  • IoT | IIoT | Smart Cities
  • Hot Topics | FinTech | WebRTC

There are 120 breakout sessions in all, with Keynotes, General Sessions, and Power Panels adding to three days of incredibly rich presentations and content.


We'll see you in New York!



Day 3 Keynote at @ThingsExpo | Chris Matthieu, CTO of Octoblu
In his keynote at @ThingsExpo, Chris Matthieu, Director of IoT Engineering at Citrix and co-founder and CTO of Octoblu, focused on building an IoT platform and company. He provided a behind-the-scenes look at Octoblu's platform, business, and pivots along the way (including the Citrix acquisition of Octoblu).
  Themes & Topics to Be Discussed

Consumer IoT
• Wearables
• Smart Appliances
• Smart Cars
• Smartphones 2.0
• Automation
• Smart Travel
• Personal Fitness
• Health Care
• Personalized Marketing
• Customized Shopping
• Personal Finance
• The Digital Divide
• Mobile Cash & Markets
• Games & The IoT
• The Future of Education
• Virtual Reality

Enterprise IoT
• The Business Case for
x IoT
• Smart Grids
• Smart Cities
• Smart Transportation
• The Smart Home
• M2M
• Authentication/Security
• Wiring the IoT
• The Internet of
x Everything
• Digital Transformation
x of Enterprise IT
• Agriculture
• Transportation
• Manufacturing
• Local & State
x Government
• Federal Government

IoT Developers | WebRTC Summit
• Eclipse Foundation
• Cloud Foundry
• Linux Containers
• Node-Red
• Open Source Hardware
• Ajax and the IoT
• Leveraging SOA
• Multi-Cloud IoT
• Evolving Standards
• WebSockets
• Security & Privacy
x Protocols
• GPS & Proximity
x Services
• Bluetooth/RFID/etc
• XMPP
• Nest Labs



The Top Keynotes, the Best Sessions, a Rock Star Faculty and the Most Qualified Delegates of ANY Internet of Things Event!


The future of computing lies in these things. As computing takes a much more active role in our lives it will at the same time become much more invisible. Internet of Things Expo will address the challenges in getting from where we are today to this future.
 
The high-energy event is a must-attend for senior technologists from CEOs on down – including CIOs, CTOs, directors of infrastructure, VPs of technology, IT directors and managers, network and storage managers, network engineers, enterprise architects, and communications and networking specialists.




@ThingsExpo Power Panel | The World's Many IoTs: Which Are the Most Important?
The Internet of Things is clearly many things: data collection and analytics, wearables, Smart Grids and Smart Cities, the Industrial Internet, and more. Cool platforms like Arduino, Raspberry Pi, Intel's Galileo and Edison, and a diverse world of sensors are making the IoT a great toy box for developers in all these areas. In this Power Panel at @ThingsExpo, panelists discussed what things are the most important, which will have the most profound effect on the world, and what should we expect to see over the next couple of years.
Benefits of Attending the Three-Day Technical Program
  LEARNexactly why Internet of Things is relevant today from an economic, business and technology standpoint.
  HEAR first-hand from industry experts the common issues and requirements for creating a platform for the Internet of Things.
  SEE what new tools and approaches the Internet of Things requires.
  DISCOVER how to drive a distributed approach to the Internet of Things, where applications move to the data.
  FIND OUThow the vast volumes of new data produced by the Internet of Things provides a valuable new source of business insight through advanced analytical techniques.
  MASTER how the ongoing development of smart cities, cars, and houses will enhance connectivity infrastructure.
Lunch Power Panel | Microservices & IoT- Moderated by Jason Bloomberg
In this Power Panel at @DevOpsSummit, moderated by Jason Bloomberg, president of Intellyx, panelists Roberto Medrano, Executive Vice President at Akana; Lori MacVittie, Evangelist for F5 Networks; and Troy Topnik, ActiveState's Technical Product Manager; and Otis Gospodnetic, founder of Sematext; peeled away the buzz and discuss the important architectural principles behind implementing IoT solutions for the enterprise. As remote IoT devices and sensors become increasingly intelligent, they become part of our distributed cloud environment, and we must architect and code accordingly. At the very least, you'll have no problem filling in your buzzword bingo cards.


Mistakes to Avoid When Handling Java Exceptions | @CloudExpo #Java #Cloud #Analytics
You either need to specify or handle a checked exception

Seven Common Mistakes You Should Avoid When Handling Java Exceptions
By Thorben Janssen

Handling an exception is one of the most common but not necessarily one of the easiest tasks. It is still one of the frequently discussed topics in experienced teams, and there are several best practices and common mistakes you should be aware of.

Here are a few things you should avoid when handling exceptions in your application.

Mistake 1: Specify a java.lang.Exception or java.lang.Throwable
As I explained in one of my previous posts, you either need to specify or handle a checked exception. But checked exceptions are not the only ones you can specify. You can use any subclass of java.lang.Throwable in a throws clause. So, instead of specifying the two different exceptions that are thrown by the following code snippet, you could just use the java.lang.Exception in the throws clause.

But that doesn't mean that you should do that. Specifying an Exception or Throwable makes it almost impossible to handle them properly when calling your method.

The only information the caller of your method gets is that something might go wrong. But you don't share any information about the kind of exceptional events that might occur. You're hiding this information behind an unspecific throws clause.

It gets even worse when your application changes over time. The unspecific throws clause hides all changes to the exceptions that a caller has to expect and handle. That might cause several unexpected errors that you need to find by a test case instead of a compiler error.

Use specific classes
It's, therefore, much better to specify the most specific exception classes even if you have to use multiple of them. That tells the caller of your method which exceptional events need to be handled. It also allows you to update the throws clause when your method throws an additional exception. So your clients are aware of the change and even get an error if you change your throws clause. That is much easier to find and handle than an exception that only shows up when you run a particular test case.

Mistake 2: Catch unspecific exceptions
The severity of this mistake depends on the kind of software component you're implementing and where you catch the exception. It might be ok to catch a java.lang.Exception in the main method of your Java SE application. But you should prefer to catch specific exceptions, if you're implementing a library or if you're working on deeper layers of your application.

That provides several benefits. It allows you to handle each exception class differently and it prevents you from catching exceptions you didn't expect.

But keep in mind that the first catch block that handles the exception class or one of its superclasses will catch it. So, make sure to catch the most specific class first. Otherwise, your IDEs will show an error or warning message telling you about an unreachable code block.

Mistake 3: Log and throw an Exception
That is one of the most popular mistakes when handling Java exceptions. It might seem logical to log the exception where it was thrown and then rethrow it to the caller who can implement a use case specific handling. But you should not do it for the following three reasons:

  1. You don't have enough information about the use case the caller of your method wants to implement. The exception might be part of the expected behavior and handled by the client. In this case, there might be no need to log it. That would only add a false error message to your log file which needs to be filtered by your operations team.
  2. The log message doesn't provide any information that isn't already part of the exception itself. Its message and stack trace should provide all relevant information about the exceptional event. The message describes it, and the stack trace contains detailed information about the class, method, and line in which it occurred.
  3. You might log the same exception multiple times when you log it in every catch block that catches it. That messes up the statistics in your monitoring tool and makes the log file harder to read for your operations and development team.

Log it when you handle it
So, better only log the exception when you handle it. Like in the following code snippet. The doSomething method throws the exception. The doMore method just specifies it because the developer doesn't have enough information to handle it. And it then gets handled in the doEvenMore method which also writes a log message.

Mistake 4: Use exceptions to control the flow
Using exceptions to control the flow of your application is considered an anti-pattern for two main reasons:

  1. They basically work like a Go To statement because they cancel the execution of a code block and jump to the first catch block that handles the exception. That makes the code very hard to read.
  2. They are not as efficient as Java's common control structures. As their name indicates, you should only use them for exceptional events, and the JVM doesn't optimize them in the same way as the other code.

So, better use proper conditions to break your loops or if-else-statements to decide which code blocks should be executed.

Mistake 5: Remove original cause of the exception
You sometimes might want to wrap an exception in a different one. Maybe your team decided to use a custom business exception with error codes and a unified handling. There's nothing wrong with this approach as long as you don't remove the cause.

When you instantiate a new exception, you should always set the caught exception as its cause. Otherwise, you lose the message and stack trace that describe the exceptional event that caused your exception. The Exception class and all its subclasses provide several constructor methods which accept the original exception as a parameter and set it as the cause.

Mistake 6: Generalize exceptions
When you generalize an exception, you catch a specific one, like a NumberFormatException, and throw an unspecific java.lang.Exception instead. That is similar to but even worse than the first mistake I described in this post. It not only hides the information about the specific error case on your API, but it also makes it difficult to access.

As you can see in the following code snippet, even if you know which exceptions the method might throw, you can't simply catch them. You need to catch the generic Exception class and then check the type of its cause. This code is not only cumbersome to implement, but it's also hard to read. It get's even worse if you combine this approach with mistake 5. That removes all information about the exceptional event.

So, what's the better approach?

Be specific and keep the cause
That's easy to answer. The exceptions that you throw should always be as specific as possible. And if you wrap an exception, you should also set the original one as the cause so that you don't lose the stack trace and other information that describe the exceptional event.

Mistake 7: Add unnecessary exception transformations
As I explained earlier, it can be useful to wrap exceptions into custom ones as long as you set the original exception as its cause. But some architects overdo it and introduce a custom exception class for each architectural layer. So, they catch an exception in the persistence layer and wrap it into a MyPersistenceException. The business layer catches and wraps it in a MyBusinessException, and this continues until it reaches the API layer or gets handled.

It's easy to see that these additional exception classes don't provide any benefits. They just introduce additional layers that wrap the exception. And while it might be fun to wrap a present in a lot of colorful paper, it's not a good approach in software development.

Make sure to add information
Just think about the code that needs to handle the exception or yourself when you need to find the problem that caused the exception. You first need to dig through several layers of exceptions to find the original cause. And until today, I've never seen an application that used this approach and added useful information with each exception layer. They either generalize the error message and code, or they provide redundant information.

So, be careful with the number of custom exception classes you introduce. You should always ask yourself if the new exception class provides any additional information or other benefits. In most cases, you don't need more than one layer of custom exceptions to achieve that.

More about Java Exceptions
As you've seen, there are several common mistakes you should try to avoid when you handle Java exceptions. That helps you to avoid common bugs and to implement applications that are easy to maintain and to monitor in production.

If this quick list of common mistakes was useful, you should also take a look at my best practices post. It provides you with a list of recommendations that are used by most software development teams to implement their exception handling and to avoid problems like the ones described in this post.

When using Retrace APM with code profiling, you can collect exceptions directly from Java, without any code changes!

The post 7 Common Mistakes You Should Avoid When Handling Java Exceptions appeared first on Stackify.

About Stackify Blog
Stackify offers the only developers-friendly solution that fully integrates error and log management with application performance monitoring and management. Allowing you to easily isolate issues, identify what needs to be fixed quicker and focus your efforts – Support less, Code more. Stackify provides software developers, operations and support managers with an innovative cloud based solution that gives them DevOps insight and allows them to monitor, detect and resolve application issues before they affect the business to ensure a better end user experience. Start your free trial now stackify.com

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Testimonials
This week I had the pleasure of delivering the opening keynote at Cloud Expo New York. It was amazing to be back in the great city of New York with thousands of cloud enthusiasts eager to learn about the next step on their journey to embracing a cloud-first worldl."
@SteveMar_Msft
 
How does Cloud Expo do it every year? Another INCREDIBLE show - our heads are spinning - so fun and informative."
@SOASoftwareInc
 
Thank you @ThingsExpo for such a great event. All of the people we met over the past three days makes us confident IoT has a bright future."
@Cnnct2me
 
One of the best conferences we have attended in a while. Great job, Cloud Expo team! Keep it going."

@Flexential


Who Should Attend?
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@ThingsExpo Blogs
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Andrew Keys is Co-Founder of ConsenSys Enterprise. He comes to ConsenSys Enterprise with capital markets, technology and entrepreneurial experience. Previously, he worked for UBS investment bank in equities analysis. Later, he was responsible for the creation and distribution of life settlement products to hedge funds and investment banks. After, he co-founded a revenue cycle management company where he learned about Bitcoin and eventually Ethereal. Andrew's role at ConsenSys Enterprise is a multi-faceted approach of strategy and enterprise business development. Andrew graduated from Loyola Un...
Digital Transformation Blogs
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