ADF Postback Payload Size Optimization

Recently I came across property called This property helps to optimize postback payload size. It is described in ADF Faces configuration section - A.2.3.16 Postback Payload Size Optimization. ADF partial request is executing HTTP post with values from all fields included. When postback property is set to dirty, it will include into HTTP post only changed values. As result - server will get only changed attributes, (more...)

Contextual Chatbot with TensorFlow, Node.js and Oracle JET – Steps How to Install and Get It Working

Blog reader was asking to provide a list of steps, to guide through install and run process for chatbot solution with TensorFlow, Node.JS and Oracle JET.


1. Chatbot UI and context handling backend implementation - Machine Learning Applied - TensorFlow Chatbot UI with Oracle JET Custom Component

2. Classification implementation - Classification - Machine Learning Chatbot with TensorFlow

3. TensorFlow installation - TensorFlow - Getting Started with Docker Container and Jupyter Notebook

4. (more...)

JavaScript – Method to Call Backend Logic in Sequential Loop

When we call backend REST service from JavaScript - call by default is executed async. This means it will not wait until response from backend is received, but will continue executing code. This is expected and desired functionality in most of the cases. But it might be requirement, where you want to call backend in synchronised way. Example - calling backend service multiple times in the loop, next call must be invoked only after previous (more...)

Custom JavaScript Client Code in Oracle Visual Builder

Hey, this is my first post about VBCS, you should expect more posts in the future about this topic. Red Samurai decided to choose VBCS as our primary JavaScript development IDE in the cloud. We are going to use it for declarative JS development, similar as we use JDeveloper for ADF.

I was going through the custom JS client code functionality in VBCS and thought it would be good idea to describe how it works. (more...)

CDN Support in Oracle JET

With the recent releases of Oracle JET - CDN support in your app can be enabled easily. By default JET app is set to download all JET toolkit related scripts and static files from the same host, where application is hosted. You can track it easily through network monitor, you should see such files as ojknockout.js, etc. fetched from same host:

CDN can be enabled by changing use property from local to cdn (more...)

Machine Learning Applied – TensorFlow Chatbot UI with Oracle JET Custom Component

This post is based on Oracle Code 2018 Shenzhen, Warsaw and Berlin talks. View presentation on SlideShare:

In my previous post I have outlined how to build chatbot backend with TensorFlow - Classification - Machine Learning Chatbot with TensorFlow. Today post is the next step - I will explain how to build custom UI on top of TensorFlow chatbot with Oracle JET.

You can download complete source code (which includes TensorFlow part, backend for (more...)

Effective Way to Get Changed Rows in ADF BC API

Did you ever wondered how to get all changed rows in the transaction, without iterating through entire row set? It turns out to be pretty simple with ADF BC API method - getAllEntityInstancesIterator, which is invoked for Entity Definition attached to current VO.

Method works well - it returns changed rows from different row set pages, not only from the current. In my experiment, I changed couple of rows in the first page:

And couple (more...)

Oracle ADF BC REST – Performance Review and Tuning

I thought to check how well ADF BC REST scales and how fast it performs. For that reason, I implemented sample ADF BC REST application and executed JMeter stress load test against it. You can access source code for application and JMeter script on my GitHub repository. Application is called Blog Visitor Counter app for a reason - I'm using same app to count blog visitors. This means each time you are accessing blog page (more...)

Microservice Approach for Web Development – Micro Frontends

This post is based on my Oracle Code 2018 Warsaw talk. View presentation on slides share:

Wondering what micro frontends term means? Check micro frontends description here. Simply speaking, micro frontend must implement business logic from top to bottom (database, middleware and UI) in isolated environment, it should be reusable and pluggable into main application UI shell. There must be no shared variables between micro frontends. Advantage - distributed teams can work on separate micro (more...)

Comparing Intent Classification in TensorFlow and Oracle Chatbot

I have created sample set of intents with phrases (five phrases per intent, and ten intents). Using this set of data to train and build classification model with TensorFlow and Oracle Chatbot machine learning. Once model is trained, classifying identical sample phrases with both TensorFlow and Oracle Chatbot to compare results. Using Oracle Chatbot with both Linguistic and Machine Learning models.


1. Overall TensorFlow model performs better. The main reason for this - I (more...)

Socket.IO Integration with Oracle JET

Socket.IO is a JavaScript library for realtime web applications. It comes in two parts - a client-side library that runs in the browser and a server-side library for Node.js. In this post I will walk you through complete integration scenario with Oracle JET.

Here you can see it in action. Send Event button from JET - sends message through Socket.IO to Node.js server side. Message is handled on server side and (more...)

ADF on Docker – Java Memory Limit Tuning for JVM

It might look like a challenge to run Java in Docker environment, by default Java is not aware of Docker memory limits. Check this article for example - Java inside docker: What you must know to not FAIL.  I was able to run WebLogic and ADF (Essential WebLogic Tuning to Run on Docker and Avoid OOM) on Docker previously without Java memory issues, using JAVA_OPTIONS=-XX:+UnlockCommercialFeatures -XX:+ResourceManagement -XX:+UseG1GC. However after Docker upgrade (more...)

Oracle JET Offline Persistence Toolkit – Offline Update Handling

Oracle JET Offline Persistence Toolkit supports offline update, create and delete operations. In this post I will describe update use case. Read previous post related to offline toolkit, where I explain how to handle REST pagination, querying and shredding - REST Paging Support by Oracle Offline Persistence in JET.

This gif shows scenario, where we go to offline mode and then changing data in multiple rows. Data update happens offline and each PATCH request is (more...)

ADF Declarative Component Example

ADF Declarative Component support is popular ADF framework feature, but in this post I would like to explain it from slightly different angle. I will show how to pass ADF binding and Java bean objects into component through properties, in these cases when component must show data from ADF bindings, such approach could offer robustness and simplify component development.

This is component implemented in the sample app - choice list renders data from ADF LOV (more...)

Find In Cache By Key ADF BC API Method Usage

What if you need to verify - if row with given key exists in fetched rowset? This could be useful while implementing validation logic. ADF BC API method findByKey - will trigger SQL call and fetch row from DB, if row with given key doesn't exist in fetched rowset. Luckily there is ADF BC API method called findInCacheByKey, this method only checks for row in fetched rowset, without going to DB - very convenient (more...)

REST Paging Support by Oracle Offline Persistence in JET

Oracle Offline Persistence query handler - Oracle Rest Query Handler supports pagination for Oracle ADF BC REST service out of the box. Check my previous post to see how querying works through offline persistence toolkit for ADF BC REST service - Shredding and Querying with Oracle Offline Persistence in JET.

Pagination is a must for large REST resources, its great that Oracle offline persistence toolkit supports it. Let's see it in action.

I navigate through (more...)

Classification – Machine Learning Chatbot with TensorFlow

Visual conversation flow is a first thing to create, when you want to build chatbot. Such flow will help to define proper set of intents along with dialog path. Otherwise it is very easy to get lost in conversation transitions and this will lead to chatbot implementation failure. Our chatbot for medical system doesn't make any decisions, instead it helps user to work with enterprise system. It gets user input and during conversation leads to (more...)

Microservices with Oracle ADF Remote Regions

ADF remote regions - functionality available in the latest ADF 12c versions. ADF remote region runs on different server and content is delivered to consuming module through ADF remote region servlet. This allows to decouple large enterprise system into separate modules, each running independently on separate servers. Gained advantage - system becomes more scalable and reliable, even if several modules will be down, system will continue to be functional.

Concept of ADF remote regions, reminds (more...)

Shredding and Querying with Oracle Offline Persistence in JET

I think offline functionality topic should become a trend in the future. Its great that Oracle already provides solution for offline - Oracle Offline Persistence toolkit. This is my second post related to offline support, read previous post - Oracle Offline Persistence Toolkit - Simple GET Response Example with JET. I have tested and explained with sample app how it works to handle simple GET response offline. While today I would like to go one (more...)

Oracle JET Composite Components – Manual for JET Coder

JET Composite Components - are useful not only to build UI widgets, but also to group and simplify JET code. In this post, I will show how to wrap JET table into composite component and use all essential features, such as properties, methods, events and slots.

Sample app code is available on GitHub. JET table is wrapped into composite component, it comes with slot for toolbar buttons:

What is the benefit to wrap such components (more...)