Cobol to Java

Adventures In Modernization: Strategy + Example Converting COBOL To Java

Dallas Monson Consulting, Java, Keyhole Creations, Programming, Technology Snapshot, Tutorial Leave a Comment

We have consultants who specialize in moving old to new, renovating dilapidated code bases, and designing brighter futures for enterprises who have been vendor-locked for most of their existence. We have come across some repeated patterns and strategies for how to approach modernization of legacy systems. In this blog, we will cover a strategy that is very popular right now, Re-Platforming.

The basic flow of this post will be:

Introduction to Modernization
High-level definition of the Re-Platforming Strategy for Modernization
Sample of Re-Platforming using Keyhole Syntax Tree Transformer, COBOL –> Java
Additional thoughts on the value/risk of this strategy

Let’s get started…



Spring Boot – The Right Boot For You!

Matt McCandless Java, Spring, Technology Snapshot, Tutorial Leave a Comment

Need a little spring in your step? Tired of all those heavy web servers and deploying WAR files? Well you’re in luck.

Spring Boot takes an opinionated view of building production-ready Spring applications. Spring Boot favors convention over configuration and is designed to get you up and running as quickly as possible.

The aim of this blog is just to get you familiar with how to get Spring Boot going on your machine. It is going to be fairly straightforward and vanilla. The goal is to get you started…



Keyhole Labs Releases Spring Boot Starter For Trouble Maker

Lauren Fournier Company News, Java, Spring, Trouble Maker Leave a Comment

The Keyhole Labs team is excited to announce the release of a Spring Boot starter for auto-configuration of Trouble Maker.

This new auto-configuration allows Spring Boot applications to easily enable Trouble Maker. Trouble Maker randomly takes down services during normal business hours in an effort to test stability and automated recovery. It also provides an ad hoc console to test application durability on demand.

See more on the Keyhole Labs blog.



Getting Started With JHipster, Part 3

Matt McCandless AngularJS, Java, JavaScript, Spring, Tutorial 1 Comment

Welcome back to this JHipster tutorial series! In part one we covered creating a monolithic application. In part two, we walked through creating a microservice application (which was a bit more complicated).

For those of you out there working to get things going with JHipster, there are some setup things and “gotchas” that I’d like to highlight. So this little blog is more of a helper for those of you who have decided to try JHipster out and play around with it. That’s what we’ll be discussing in this blog post with the hope that I can help you minimize the getting-up-to-speed curve…



Getting Started With JHipster, Part 2

Matt McCandless AngularJS, Java, JavaScript, Microservices, Technology Snapshot Leave a Comment

In part two of this series, we create a microservice architecture using JHipster’s available options for doing so. There is quite a bit more work to do with this approach as compared with the monolithic approach. But, in the end, it pays off. You will see the benefits and flexibility in decoupling our different layers of our architecture. Each layer will not be dependent upon another to run. Let’s get started…



Web Development Business

Blood, Sweat, and Writing Automated Integration Tests for Failure Scenarios

Billy Korando Java, Opinion, Programming, Spring, Tutorial 2 Comments

I introduce the process I went through to diagnose the bug and determine the correct integration test solution to fix it the right way. In doing so, I had to create a test that accurately reproduced the scenario my service was experiencing in PROD. I had to create a fix that took my test from failing to passing. And finally, I worked to increase confidence in the correctness of code for all future releases, which is only possible through automated testing.



Getting Started With JHipster, Part 1

Matt McCandless AngularJS, Java, JavaScript, Spring, Technology Snapshot Leave a Comment

So, you want to stay on the leading edge of technology, but feel overwhelmed by all the moving parts. You’re in luck! jHipster aims to make setting-up an app fairly painless.

In this jHipster series we are going to take you through, first, creating a monolithic application. Secondly, we will make an app in the microservices style. Last, we’ll give you some tips and tricks for jHipster best practices. Let’s first begin with Part One…



Spring Batch: Multiple Format Output Writer

Jonny Hackett Java, Spring, Spring Batch Leave a Comment

Being a strong advocate of Spring Batch, I’ve always talked about the notion of Spring Batch providing developers with a framework that allows them to focus on solving business needs. By doing so, it allows developers to not spend an inordinate amount of time solving all of the technical aspects to support the solution. To illustrate what I mean by …



JSON Web Tokens

JSON Web Tokens With Spring Cloud Microservices

Thomas Kendall Java, JavaScript, Microservices, Security 3 Comments

At Keyhole, we have published several blogs about Microservices. We’ve talked about architectural patterns used in a Microservices environment such as service discovery and circuit breaker. We’ve even posted blogs on platforms and tools, such as the recent blog on Service Fabric. One important piece of the architecture that we have glossed over is the security around Microservices. Specifically, authentication …