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…



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…



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.



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 …



Introducing The Delegate Pattern

Rik Scarborough Java, Spring Batch Leave a Comment

Delegate: a person who is chosen or elected to vote or act for others – Merriam-Webster. Delegate pattern: In software engineering, the delegation pattern is a design pattern in object-oriented programming where an object, instead of performing one of its stated tasks, delegates that task to an associated helper object – Wikipedia. Make things as simple as possible, but not simpler – Albert …



Hystrix To Prevent Hysterix

Dallas Monson Java, Microservices, Spring 2 Comments

Your application just launched into production after 6+ months of development and bug fixes. In true Agile fashion, you and the team released your MVP (minimal viable product). You did your best to simulate load and try to emulate actual user actions so that you can anticipate how your app will behave in the wild. Now, however, you have thousands …



Keyhole Releases Open Source Trouble Maker

Lauren Fournier Company News, Keyhole Creations Leave a Comment

The Keyhole Software team is excited to announce the release of a new open source tool: Trouble Maker. Trouble Maker helps organizations to maintain stable and durable platforms when implementing Microservices platforms and Java web applications. Trouble Maker randomly takes down services during normal business hours in an effort to test stability and automated recovery. In addition, it provides an ad hoc console to produce …