Raible Designs

Developing Services with Apache Camel - Part II: Creating and Testing Routes

This article is the second in a series on Apache Camel and how I used it to replace IBM Message Broker for a client. The first article, Developing Services with Apache Camel - Part I: The Inspiration, describes why I chose Camel for this project.

To make sure these new services correctly replaced existing services, a 3-step approach was used:

1. Write an integration test pointing to the old service.
2. Write the implementation and a unit test to prove it works.
3. Write an integration test pointing to the new service.

I chose to start by replacing the simplest service first. It was a SOAP Service that talked to a database to retrieve a value based on an input parameter. To learn more about Camel and how it works, I started by looking at the CXF Tomcat Example. I learned that Camel is used to provide routing of requests. Using its CXF component, it can easily produce SOAP web service endpoints. An end point is simply an interface, and Camel takes care of producing the implementation.

Developing Services with Apache Camel - Part I: The Inspiration

In early May, my client asked me to work on a project migrating from IBM Message Broker 6.1 to an open source solution. Their reason was simple, the IBM solution was end of life and outdated. To prove how out of date it was, the Windows version required Windows XP to run. IBM WebSphere Message Broker has been replaced by IBM Integration Bus in recent years, but no upgrade path existed.

At first, I didn't want to do the project. I was hired as a Modern Java/UI Architect and I had enjoyed my first month upgrading libraries, making recommendations and doing a bit of UI performance work. I hadn't done much with ESBs and I enjoy front-end development a lot more than backend. It took me a couple days to realize they were willing to pay me to learn. That's when I decided to clutch up, learn how to do it all, and get the job done. This article is the first in a series on what I learned during this migration project.

My approach for figuring out how everything worked was similar to working on any new application. I get the source code, install the software necessary to run it, and run it locally so I can interact with it.

Getting Started with JHipster on OS X

Last week I was tasked with developing a quick prototype that used AngularJS for its client and Spring MVC for its server. A colleague developed the same application using Backbone.js and Spring MVC. At first, I considered using my boot-ionic project as a starting point. Then I realized I didn't need to develop a native mobile app, but rather a responsive web app.

My colleague mentioned he was going to use RESThub as his starting point, so I figured I'd use JHipster as mine. We allocated a day to get our environments setup with the tools we needed, then timeboxed our first feature spike to four hours.

My first experience with JHipster failed the 10-minute test. I spent a lot of time flailing about with various "npm" and "yo" commands, getting permissions issues along the way. After getting thinks to work with some sudo action, I figured I'd try its Docker development environment. This experience was no better.

JHipster seems like a nice project, so I figured I'd try to find the causes of my issues. This article is designed to save you the pain I had. If you'd rather just see the steps to get up and running quickly, skip to the summary.