J-Fall Virtual 2020: Duncan Bloem – Migration strategy from (10-15yr) old Java-EE app to modern cloud native apps

10 to 15yrs ago, ABN begun leveraging internet banking. Many (thousands) of web-app were written in java-ee style, deploy on IBM Websphere clustered machines. Remote EJB2 and JNDI was the prefered way to create small and flexible applications. Everything was focussed to _prevent_ deployments at all costs. Because of the long deployment cycle. Nowadays, we embrace fast deployments, and minor changes are done with new deployments and dependencies are minimized at all costs (micro-services). Within ABN, the challenge is to migrate these thousands of web-apps in a cost effective and reliable to cloud native solutions. Also, taking into consideration the current dynamics within the java ecosystem, jdk’s, graalvm, native (quarkus/micronaut), cloud, etc. In this presentation I will outline ABN’s strategy to transform this legacy application landscape to a modern approach, in a cost effective and reliable way.

First we upgraded from remote EJB2 to remote EJB3 (from Factory to DI)
Remote EJB3 to local EJB3
EJB3 to DI


JNDI to file property sources (from dynamic to static)
For property files to property servers (consul, keyvault, etc)

Which result in lean and mean Jakarta EE applications, which can be run as Old Websphere(WAS), Open Liberty, Spring-boot and Quarkus applications. The process was reliable (no big bang) and results in modern state-of-the-art applications.

Bio Duncan:

Senior Java developer since 2008; 2012 finalist startup bootcamp amsterdam Mipagar (https://www.wired.co.uk/article/amste… 2015 MT member of docdata payments and CM.com; 2018 ABN Amro Team lead – Java Centre of Expertise; Responsible for Java code quality throughout ABN Amro

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