Weblogic under Kubernetes: the weblogic topology of the future

Already 4 months ago I attended the PaaSForum 2019 in Mallorca. As every year it was great to meet members of the big EMEA Oracle Partner family.

And of course a lot of interesting talks and workshops. This year I was especially interested in announcements around SOA Suite and Project Helidon as a Microservice framework. But certainly also Weblogic under Kubernetes.
And actually, to me, the Kubernetes Weblogic Operator that was this years most enthusing (more...)

Dynamic tabs with Angular 6+ and ng-bootstrap

One of our Angular applications required the use of dynamic tabs. Since the project already uses ng-bootstrap components and bootstrap for the styling, I decided to use the tabset component from ng-bootstrap.

The tabs needed to fulfil the following requirements:
– A tab can be opened and closed.
– Tabs can display different components depending on the menu item clicked.
– There can only be one open tab for a given component.
– If a (more...)

Test Automation Days 2019

Vorige week woensdag en donderdag (19 en 20 juni) werden de Test Automation Days gehouden. De eerste dag bestond uit twee workshops die elk drie uur duurden. Op tweede dag van de Test Automation Days werden vooral presentaties gehouden. Ik zal van drie van deze presentaties een samenvatting geven.

Keynote sessie: Balancing your test automation with exploratory testing – Mirjana Kolarov (Levi9 IT Services)

Kernboodschap is: geautomatiseerd testen is niet de vervanging van alle andere (more...)

Upgrade Failure as Blessing in Disguise?


The Findings of an Failed Enterprise Manager Upgrade to OEM13.3

When Oracle Enterprise Manager Cloud Control 13.3 (here just called EM 13.3) came available I read the upgrade documentation and decided that the most cost-effective option for us was to stay with EM 13.2.

Later, a rumor about a security issue with Weblogic spooked the management and it requested that we should upgrade the EM to 13.3 to be (more...)

Collective Data Set and Equal Data Position between B2B Partners in Data Sharing Ecosystems – enter: Blockchain


Many organizations collaborate in one or more ecosystems: groups of organizations that work together in vertical chain or share common interests sometimes even despite being competitors. Examples are research environments (health, climate, agriculture, environment), supply chains & logistics, insurance industry, government agencies, pension funds, traffic management. Note that within large, loosely organized companies an ecosystem could consist of various divisions, sites or departments).

Within the the ecosystem, some data is considered open – equally accessible (more...)

Correlation calls for Common Cause Consideration

Correlation is a powerful thing. When two metrics rise and fall in a similar way, surely that cannot be just coincidence. It has to be meaningful in some way.


In our minds correlation is easily turned into causality. Our minds are wired to think like that: find the narrative in what we observe. So one the phenomenon represented by one metric is all too readily considered to be an influencing factor on the phenomenon measured (more...)

Custom Log Parser in OMC Log Analytics to deal with Extended Logging in WebLogic Access Log

We recently enabled Extended HTTP Access Logging on our WebLogic Managed Servers. This adds the average response times and potentially several other valuable values to the WebLogic Access Log files. Unfortunately, the WebLogic Access Log file parser in Oracle Management Cloud Log Analytics does not know how to handle the Extended Log File Format (ELFF) that is now used for formatting the log files. As a result, no structured analysis can be performed on the (more...)

Graceful shutdown of forked workers in Python and JavaScript running in Docker containers

You might encounter a situation where you want to fork a script during execution. For example if the amount of forks is dependent on user input or another specific situation. I encountered such a situation in which I wanted to put load on a service using multiple concurrent processes. In addition, when running in a docker container, only the process with PID=1 receives a SIGTERM signal. If it has terminated, the worker processes receive a (more...)

Smoke Escaping from a Black Box – how to tackle major production issues on a system that is not very transparent

This story is based on true events. It happened fairly recently.

imageI was called into an organization that was experiencing performance and stability issues that affected mission critical processes. Every now and again, and increasingly frequently, their service bus stopped working. It appeared as if only a restart could get things going again. There was no insight into the trigger nor the underlying problem that caused this loss of service.

Unfortunately – although it did (more...)

Performance! 3 reasons to stick to Java 8 for the moment

It is a smart thing to move to newer versions of Java! Support such as security updates and new features are just two of them but there are many more. Performance might be a reason to stick to Java 8 though. In this blog post I’ll show some results of performance tests I have conducted showing Java 11.0.3 has slower startup times and slightly slower throughput compared to Java 8u202 when using the (more...)

Differences between CloudFormation, Terraform and Ansible in deployment of objects in AWS

In this article, I will deploy a simple solution in AWS in three ways: via the AWS templates of CloudFormation, via a Terraform script and via an Ansible script. By doing so, I will show the differences between the mentioned scripts. In the article, I will highlight a few examples to give an idea about the possibilities of a tool. The full scripts can be downloaded, see the links at the end of the article. (more...)

Using ElasticSearch, Fluentd and Kibana (for log aggregation)

In my last article I describe how I installed ElasticSearch, Fluentd and Kibana (EFK).

In this article I will dive into using ElasticSearch, Fluentd and Kibana. Besides log aggregation (getting log information available at a centralized location), I will also describe how I created some visualizations within a dashboard.

Kibana 7.0 has a new sleek design, streamlined navigation, and more for an extra delightful user experience.


Elasticsearch (more...)

The Pipelined Pancake Party – demonstrating the Power of Parallelization and Pipelining in JavaScript with Promises and Asynchronous Generators

This article is an attempt to demonstrate the performance gains – and programming elegance – that is at our disposal with the advent of asynchronous generators in ES 2018 (JavaScript), for example in Node 10 and later. With asynchronous generators and Promises, we can implement parallel, asynchronous and pipelined processing that allow us to process a result set ahead of time.

The business case at hand… a pancake party (this may be a very Dutch (more...)

JavaScript Pipelining using Asynchronous Generators to implement Running Aggregates


As of ES 2018 (recent browsers or Node 10), JavaScript support asynchronous generators. Generators are functions that return a set of values, one value at a time. These values can be processed inside the code that invokes the generator immediately, as soon as they become available. There is no need to wait for the entire result set to be composed first. In cases where the result set is huge or even never ending, this is (more...)

Jupyter Notebook for retrieving JSON data from REST APIs

If data is available from REST APIs, Jupyter Notebooks are a fine vehicle for retrieving that data and storing it in a meaningful, processable format. This article introduces an example of a such a dataset:


Oracle OpenWorld 2018 was a conference that took place in October 2018 in San Francisco. Over 30,000 attendees participated and visited some 2000 sessions. Raw data from the session catalog is available from an API – a REST service that (more...)

The Full Oracle OpenWorld and CodeOne 2018 Conference Session Catalog as JSON data set (for data science purposes)

Oracle OpenWorld and CodeOne 2018 are two co-located conferences that took place in October 2018. Some 2000 sessions presented by over 2500 presenters form the core of these conferences. Many details are known about each of the sessions and the speakers – from title, abstract, room (size), date and time, session slides, session type and key topics to first name, last name, Twitter handle, picture, company, job title and bio. image

A data set is available (more...)

Making an IoT Badge – #badgelife going corporate

Code Card 2018

Editor’s note:  Noel is the last man standing from the AppsLab to work at Oracle. He created this project while being part of the Oracle Groundbreakers Team. The rest of the original AppsLab team members are now scattered throughout different companies in the tech sector.

For years I’ve been wanting to create something fun with the almighty esp8266 WiFi chip. I started experimenting with the esp8266 almost exactly four years ago. Back then (more...)

Developing concept products that embrace emerging technologies

Editor’s note: For posterity’s sake, I’m reposting some content that we created during our time at Oracle. These statements and views are those of the author and do not reflect those of Oracle’s current user experience organization.

Developing concept products that embrace emerging technologies

Working with emerging technologies brings unique challenges for developers. There are few to no users out there one can ask about requirements.

The AppsLab, the Oracle Applications User Experience (OAUX) emerging (more...)

Designing for What’s Not Yet Here

Editor’s note: For posterity’s sake, I’m reposting some content that we created during our time at Oracle. These statements and views are those of the author and do not reflect those of Oracle’s current user experience organization.

Designing for What’s Not Yet Here

Designing for emerging technologies means seeing how these technologies can help solve user problems in the enterprise and turn invention into innovation. Because design is somewhere at the intersection of people, technologies, (more...)

User Research at the Forefront of Technology

Editor’s note: For posterity’s sake, I’m reposting some content that we created during our time at Oracle. These statements and views are those of the author and do not reflect those of Oracle’s current user experience organization.

What do you do when you don’t have users yet?

Oracle’s approach to researching emerging technologies isn’t really about the technology; it’s about the users: observing, listening, empathizing, and learning about our users and what matters to them.