Updating Java Enterprise applications can be a complex task. Typically you’d perform one or more steps from this list: determining what database schema version you are running in the target environment applying one or many SQL scripts for upgrading a schema (adding tables, columns, …) running one or many migration […]
General
In the past I have used Jenkins excessively both professionally as well as for my private / open source projects. For the latter, I run and maintained my own Jenkins instance, running on an HP server in my basement 🙂 I am currently trying to become as „lean“ as possible, […]
Migrating from Jenkins to Travis CI
Just recently I needed to merge multiple Git repositories into one. This might seem trivial, but there are just so many ways to do this, it can be confusing 🙂 My requirements were: merge multiple repositories into a new repository preserve history of all artefacts have every old repository in […]
Merging multiple Git repositories into one
Data Volume in Enterprise Applications and JPA Most Enterprise applications are dealing with significant amounts of data, typically managed in a transactional manner where SQL is still the persistence management of choice, sometimes combined with NoSQL databases depending on requirements. Java Persistence API (JPA) greatly improved developer efficiency, removing some […]
Automatic database index creation with the Java Persistence API
Let’s assume you have one of these use cases: limited bandwidth to your public mail server polling / frequent automated access to email inboxes, e.g. by means of scripts mailboxes with sensitive data that you would like to mirror / backup in almost real time For these kinds of tasks, […]
Setting up a local IMAP cache with OfflineIMAP
I recently ran into issues getting ZWave to run on openHAB 2 on my new hardware: an Odroid C2. I added the ZWave binding to the openHAB installation, provided the port of the ZWave USB Stick in the configuration settings and… nothing happened. openHAB insisted that the „Port /dev/ttyUSB1 does […]
openHAB + ZWave: solving the „Port … does not exist“ ...
I am a long-time user of openHAB – started setting up a „Smart Home“ back in the times when there was still an openHAB 1.6. The reason I am using openHAB is because it had and has a vital community is vendor agnostic and allows to set up an extremely […]
Setting up openHAB on Odroid-C2
This article will describe one (of possible many) solutions for solving the Fisher & Thompson Job Shop Scheduling Problem. I will use the FT10 data set, which consists of 10 machines 10 jobs with 10 steps each Each job consists of many steps, that need to be processed in a […]
Solving Fisher Thompson FT10 with Optaplanner
4 I recently released a „j-lawyer.BOX 2“ – a Linux based server with the j-lawyer.org case management software pre-installed – based on Odroid HC1. Until now, there was a j-lawyer.BOX 1 based on Odroid C2 which has proven to be very reliable. Two pilot users / customers mentioned they were facing […]
Java process crashing on Odroid HC1 / XU4
8 This article will describe how to use Optaplanner for job shop scheduling, using automated Caipirinha manufacturing as an example. (By Christian „VisualBeo“ Horvat [CC BY-SA 2.0 de (https://creativecommons.org/licenses/by-sa/2.0/de/deed.en)], from Wikimedia Commons) Introduction The Problem Let’s assume you are running a high volume, fully automated Caipirinha bar. Making Caipirinha involves the […]