A Maven seed project for GWT, Google App Engine and JDO

GWT and AppEngine Convention, without IDE Configuration

A Maven seed project for GWT, Google App Engine and JDO


This project offers a conventional seed project for a full-stack application that is pre-configured and ready-to-go. The goal is to offer a simple, working example of a CRUD application, using an entity relationship framework, enterprise-level validation, which sits atop a cloud-based, schemaless, high-replication datastore that has zero dependency on an IDE. How is this done? The entire dependency management and build lifecycle configuration is done solely through Maven.

This project currently supports the following:

  • Google Web Toolkit 2.7.0
  • Google App Engine 1.9.18 through a schemaless high-replication datastore (HRD)
  • DataNucleus JDO 3.0
  • JUnit 4.12
  • Google Chrome. Due to the limitations for symbol-map support in IE and Firefox, you need to test with Google Chrome to see error log messages logged by the UI.


This project is licensed under Apache License 2.0

Project location



A few years ago, I was working for a company who let developers use their preferred IDE, using a BYOD approach to the authoring environment. I thought that was very cool, and I also believe it’s an approach likely to gain favor as more companies move to a Docker containers for development.

Some developers kept their own lifecycle mappings for Eclipse, some developers worked purely from the command line, and others benefitted from how IntelliJ introspected parent POMs to understand dependencies. Some developers kept their own m2e configurations.

At the time, I didn’t have any experience with Maven. Lots of developers lack Maven experience, and there’s a steep learning curve with Maven, especially if you need to create an environment-specific configuration, such as working in Eclipse with m2e.

I prefer IntelliJ it for development, but my preferences shouldn’t dictate the team’s preferences. Lots of people prefer Eclipse or Netbeans. For my most recent application, I had a hard time finding a starting point for my GWT/GAE/JDO project that didn’t include IDE specific configuration, and I had a harder time finding documentation and examples which didn’t omit the intricacies between the different SDKs and frameworks.

So, when my company decided to move from Eclipse to IntelliJ, we came across a few issues with our migration. First, it became difficult to share a project between Eclipse and IntelliJ. We had been using Maven for dependency management, but not lifecycle management.

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Validators with Formatters in a Stateful Form

I’ve released a project on GitHub called Form & Function. I build this project and then used for a large Eligibility Application for a client, where it proved pretty useful. The problem domain I was dealing with dealt with how to develop a large, forms based application where user-feedback needs to be rock-solid and the feedback needs to happen constantly, to ensure as many fields get completed in a single setting as possible.  

In a nutshell, what does it do?
Form & Function
reminds a user that their time-investment matters to you and your organization by giving the best possible experience when filling out a form.

In brief technical jargon, what does it do?
Form & Function creates the relationship between a validator, a formatter, and a restrictor for the most popular form types, and then notifies the developer and user about a form’s validity.

Who does it help?

  1. For developers, it simplifies building complex forms.
  2. For users, it helps them complete long forms.
  3. For project managers, it’s a milestone met.
  4. For user experience designers, it’s a starting place for a conversation.

Where can I find Form & Function?
The code base is hosted on code.google.com. Feel free to download the latest version of Form & Function from the Subversion trunk. Over the next few months, the project will be in a “Bleeding-Edge” release, and should not be considered backwards compatible from day-to-day.

What problems can Form & Function solve with my Flex Project?

Problem 1: The standard Flex Validators are too generic
Let’s start from the top and talk about the Adobe Flex validators. The types of validators Flex currently offers are:

  • CreditCardValidator
  • CurrencyValidator
  • DateValidator
  • EmailValidator
  • NumberValidator
  • PhoneNumberValidator
  • RegExpValidator
  • SocialSecurityValidator
  • StringValidator
  • Validator
  • ZipCodeValidator

Adobe gives you all the hooks you need to build your own validators using the Validator class and the RegExpValidator class (and both are used liberally with Form & Function).

The more specific validators, such as the CreditCardValidator, won’t validate credit-card security codes, only credit-card numbers). While a Merchant may not require the user enter a security code, the ability to validate against a security-code that’s tied into the card-type, should have been there all along, along with a CreditCardFormatter for user legibility.

Form & Function has validators that either improve upon, or plain-old, don’t exist in the latest Flex SDK.
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