WebLogic Community

If you are modernising Oracle Forms system, high chance you need to rely on DB proxy connection. Read more about it in my previous post for ADF 11g – Extending Application Module for ADF BC Proxy User DB Connection. It works in the same way for ADF 12c, but there is issue related to handling DB error, when DB proxy connection is on. DB error is propagated to ADF but is being substituted by save point error (as result – user would not see original error from DB). It seems like related to JDBC driver in 12c. The workaround is to override ADF SQL builder class and disable save point error propagation (there might be better ways to workaround it).
Proxy connection is established from prepareSession method in generic AM Impl class:

If I would change salary value to negative and save data – DB constraint error would fire (negative not allowed). Unfortunately, end user would not see that error – he gets message about failed save point: Read the complete article here.

WebLogic Partner Community

For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center.

Blog Twitter LinkedIn Forum Wiki

Technorati Tags: PaaS,Cloud,Middleware Update,WebLogic, WebLogic Community,Oracle,OPN,Jürgen Kress

Sorting of columns are not supported in ADF TreeTable by default.

The documentation of 12c says :

Unlike the Table, the TreeTable does not support automatic sorting. The underlying TreeModel must support sorting by implementing it’s sorting logic in the setSortCriteria(List criteria) method of the TreeModel.

But my client wanted sorting on the tree table on few columns. It was a good challenge and this is how I solved it.

Steps :

1. The treeModel is based on a managed bean. You cannot have the tree based on ADF-BC bindings. Simply because you need to override setSortCriteria().

2. Added a few Comparators required for sorting of the columns. Read the complete article here.

WebLogic Partner Community

For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center.

Blog Twitter LinkedIn Forum Wiki

Technorati Tags: PaaS,Cloud,Middleware Update,WebLogic, WebLogic Community,Oracle,OPN,Jürgen Kress

If you would like to boost ADF UI performance, you should look into client side validation and formatting options possible to be done in ADF UI. Today I will describe how you can implement client side converter, to format number value on client side, without making request to the server. Same approach could be used to implement client side validators. You can raise error message and it will be assigned to UI field in the same way, just like any standard ADF error message. While this approach is documented long ago in Oracle ADF developer guide – How To Create Client Side Converter, it is not well known and not often used.
Client side converter is attached to ADF UI field through JSF tag, it points to custom converter ID (make sure autoSubmit=false is set, we don’t want request to the server on value change): Read the complete article here.

WebLogic Partner Community

For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center.

Blog Twitter LinkedIn Forum Wiki

Technorati Tags: PaaS,Cloud,Middleware Update,WebLogic, WebLogic Community,Oracle,OPN,Jürgen Kress

Vue.js is a popular framework for developing rich client web applications, leveraging browsers for all they are worth. Vue.js has attracted a large number of developers that together have produced a large number of quite interesting reusable components. ADF Faces is itself a quite mature framework for the development of rich web applications. It was born over 10 years ago. It has evolved over the years and adopted quite a few browser enhancements over the years. However, ADF Faces is still – and will stay – a server side framework that provides only piecemeal support for HTML5 APIs. When developing in ADF Faces, it feels a bit as if your missing out on all those rapid, cool, buzzing developments that take place on the client side.

Oracle strongly recommends you to stay inside the boundaries of the framework. To use JavaScript only sparingly. To not mess with the DOM as that may confuse Partial Page Rendering, one of the cornerstones of ADF Faces 11g and 12c. And while I heed these recommendations and warnings, I do not want to miss out on all the goodness that is available to me.

So we tread carefully. Follow the guidelines for doing JavaScript things in ADF Faces. Try to keep the worlds of ADF Faces en Vue.js apart except for when they need to come into contact.

In this article, I will discuss how the simplest of Vue.js application code can be integrated in a ‘normal’ ADF Faces web application. Nothing fancy yet, no interaction between ADF Faces client components and Vue.js, no exchange of events or even data. Just a hybrid page that contains ADF Faces content (largely server side rendered) and Vue.js content (HTML based and heavily post processed in JavaScript as is normally the case with Vue.js).

The steps we have to go through: Read the complete article here.

WebLogic Partner Community

For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center.

Blog Twitter LinkedIn Forum Wiki

Technorati Tags: PaaS,Cloud,Middleware Update,WebLogic, WebLogic Community,Oracle,OPN,Jürgen Kress

One of the biggest advantages of Oracle JET is, that we have a toolkit instead of a framework. This means, we are easily able to add third party libraries into our stack. When you take a look at all those javascript libraries out there, you will realize that the pain is to choose the right library for the right purpose.

With version 2.2 you had to rely on bower to add components or libraries. Now in version 3 everything is about NPM. In my opinion it is great that they switched from to different package managers to only one.

Let’s take a closer look on how to add an additional Library to a new Oracle JET app. One Library I often use is socket.io. Lets create a simple example app with socket.io integration. Read the complete article here.

WebLogic Partner Community

For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center.

Blog Twitter LinkedIn Forum Wiki

Technorati Tags: PaaS,Cloud,Middleware Update,WebLogic, WebLogic Community,Oracle,OPN,Jürgen Kress

What if you want to access mobile device location data from JET Hybrid application? This can be achieved with Cordova Geolocation plugin. But you want it to be nicely done and want to make sure application is granted with permission to access location information. Use Cordova Permissions plugin for that.
You could add Cordova plugin to JET app by executing this command:
cordova plugin add 
If this command doesnt work for any reason, you could add plugin information directly into config.xml file (check Geertjan post about the same – Plugging into Devices with Oracle JET on Cordova (Part 1)):
In JS function, before calling location API – we call permissions API to check if app is already granted permission to read location data. In hasPermission method, in case of success – location data is accessed. In case of no permission, request for permission is sent. If request is satisfied – location is accessed (and permission is granted at the same time): Read the complete article here.

WebLogic Partner Community

For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center.

Blog Twitter LinkedIn Forum Wiki

Technorati Tags: PaaS,Cloud,Middleware Update,WebLogic, WebLogic Community,Oracle,OPN,Jürgen Kress