Author: Lucas Jellema

Oracle’s cloud ambitions are as high as ever before. All software from Oracle should run both on premise as well as in the cloud. Moving components from on-premise to …

During this week’s Oracle OpenWorld Conference, we were given some sneak peeks into the short term future of the Oracle SOA Suite. During various roadmap sessions, on the demo …

In this article a first brain dump with observations from the Oracle OpenWorld and JavaOne conferences. These are fairly raw notes – primarily for my own consumption. They may …

As I was wandering (and wondering) around the demo grounds at Oracle OpenWorld, I bumped into a booth demonstrating the upcoming Oracle Cloud Document Service. This service is yet …

Being at JavaOne 2013 has inspired me to heed the call to option from the Java team at Oracle and give JDK 8 Early Adopter a spin. This article …

Corporate speakers at Oracle OpenWorld or JavaOne draw from a range of expressions that may have less than obvious meanings. These expressions are used sometimes for brevity and at …

As I am about to start my ninth Oracle OpenWorld Conference, I am wondering what this year’s conference will have in store for me. My schedule is largely filled  …

Recent press releases as well as the comment provided by Oracle’s top brass around the FY14 Q1 earning provide some insight in what the key stories seem likely to …

The story of NOPERU – the National Organization for Permits for Emissions and Resource Usage – is an interesting one. Because it reveals the business drivers for embarking on …

WebLogic 12c (12.1.2) has support for WebSockets. ADF 12c runs on WebLogic 12c. Therefore, we should be able to leverage that WebSockets support in an ADF application. And indeed …

Hierarchical data is common phenomenon in the real world. Presenting such data to allow users to quickly grasp the composition of numbers, to compare quantities, to navigate through a …

In a recent post (https://technology.amis.nl/2013/07/24/oracle-database-12c-find-most-valuable-player-using-match_recognize-in-sql/)  I described how we can use the new Oracle Database 12c MATCH_RECOGNIZE operator to spot patterns in records and derive results from those patterns. …

One of the very nice new features in SQL in Oracle Database 12c is the MATCH_RECOGNIZE operator. MATCH_RECOGNIZE adds a facility for spotting patterns in records. This allows us …

The recent JDeveloper/ADF 11gR1 Patch Set 6 release introduced the Sunburst component, one of the many data visualization components in ADF. Sunburst (sometimes called Rings Chart) provides an attractive …

Last week – just when I was at the far end of a narrow internet connection – Oracle released JDeveloper 12c (12.1.2) along with ADF 12c and WebLogic 12c …

Real time events can be translated into a live visual representation using a largely declarative approach. Events can be published for example on a JMS Topic. Using Oracle BAM …

Flashback started out as a feature in Oracle Database 9i. Although to be honest it is just the opening up of a mechanism that has been at the core …

I am first and foremost a developer. I am not an administrator. I know more about IDEs and GUIs than about command line. I have always been a little …

I have a confession to make. I have not been into Linux very much. When I started my career at Oracle, back in 1994, I had to do a …

When a record is no longer active – it is logically discarded – you may want to delete it. However, the record may still be required – for compliancy …

Oracle 8i (8.1.6 if I remember correctly) started with the introduction of a that wonderful new phenomenon in SQL: Analytical Functions. Functions that basically allow the result for one …

Joining is a key ingredient in most SQL queries. Using collections (aka nested tables) that are produced on the fly inside the SQL query or that are returned by …

  Oracle Database 12c ships with a brand new supplied package called UTL_CALL_STACK. This package provides an API for inspecting the PL/SQL Callstack. The package complements the DBMS_ UTILITY.FORMAT_CALL_STACK …

At long last it’s here: Oracle Database 12cR1. The download of this fresh software package is hardly done. It is time to start sharing some of our early experiences …

One of the brand new specifications in Java EE 7 is JSR-352 Batch Applications for the Java Platform. This specification describes how Java EE containers will allow applications to …

In this article, I show how I have created a simple and fairly meaningless Java EE 7 application that uses a number of smart Java EE features: a stateless …

Last week saw the release of Java EE 7 – the new edition of the Java Enterprise platform. It is a substantial release – which advances the Java Enterprise …

It was fairly difficult to come up with a title for this article that sort of covers the content. To me it is quite clear what this is about …

Last week I was prompted to take a look at the new Oracle ADF Academy that has just published its first lesson: Developing Applications with ADF Mobile. As you …

To be useful, data held and used in information systems has to live up to a number of expectations. The data should be an accurate representation of its source. …

We all know a lot of money is involved with professional sports. One of Europe’s major sports is football (or soccer as some like to call it). A lot …

In a recent article (https://technology.amis.nl/2013/04/02/adf-dvt-using-the-tree-map-visualization-component-to-compare-relative-sizes-and-distributions/) I discussed the ADF DVT Treemap component. This component visualizes data in such a way that comparisons between data values for different records and …

The tree map component is one of those data visualization components that can tell an entire story through a simple picture. But of course that picture is anything but …

One recurring theme in my articles on ADF has been that end users usually do not care about data. They are interested in getting information that helps them answer …

Communication between taskflows and pages, beans and other components in ADF Faces applications is in many cases ideally implemented using contextual events. These events are published from a producer …

Using Oracle SQL to resolve meaningful and slightly less serious challenges is one of my favorite (semi-)professional pastimes. In the last two weeks, I have been presenting on various …

Gantt Charts in ADF are interesting components to visualize data that is organized according to time. The Gantt Charts have a horizontal time axis. In rows along the vertical …

The challenge in this article is a simple one. I have a table with records (duh!) and each record describes the occurrence of a certain payload. In this example …

I use subquery factoring a lot, to make my SQL queries easier to write. This basically means that most of my queries these days start with WITH rather than …

Data Constraints are essential in protecting the integrity of the data in any relational database. The Oracle Database provides four types of declarative constraints that help implement various types …