Skip navigation.

Shay Shmeltzer

Syndicate content
Tips and information about Oracle JDeveloper and Oracle ADF
Updated: 6 hours 19 min ago

Required Field Validation in Oracle MAF

Fri, 2014-08-08 16:38

A short entry to explain how to do field validation in Oracle MAF. As an example let's suppose you want a field to have a value before someone clicks to do an operation.

To do that you can set the field's attribute for required and "show required" like this:

  <amx:inputText label="label1" id="it1" required="true" showRequired="true"/>

 Now if you run your page, leave the field empty and click a button that navigates to another page, you'll notice that there was no indication of an error. This is because you didn't tell the AMX page to actually do a validation. 

 To add validation you use an amx:validationGroup tag that will surround the fields you want to validate.

For example:

     <amx:validationGroup id="vg1">

    <amx:inputText label="label1" id="it1" required="true" showRequired="true"/>


Then you can add a amx:validateOperation tag to the button that does navigation and tell it to validate the group you defined before (vg1 in our example).

       <amx:commandButton id="cb2" text="go" action="gothere">

        <amx:validationBehavior id="vb1" group="vg1"/>


Now when you run the page and try to navigate you'll get your validation error.

Categories: Development

Accessing remote databases from Oracle MAF with the TopLink/EclipseLink REST CRUD Services

Mon, 2014-08-04 15:17

In the last post I showed you how simple it is to expose CRUD REST operations on your database with TopLink/EclipseLink.

The next logical step is to then consume those with Oracle MAF to build a mobile application.

This is quite simple with the REST data control. All you need to do is just map the right URLs and create the operation.

Here is a quick demo:

One trick I show in the demo is how to delay the call to a REST service until the user actually provides a value to a parameter. A common issue people have when they have the parameter form and the results on the same page. The solution is easy using the refresh condition of the executables of the page and using the "ne null" check on the parameter value. 

Categories: Development

REST enable your Database for CRUD with TopLink/EclipseLink and JDeveloper

Fri, 2014-08-01 17:10

It seems that REST interfaces are all the rage now for accessing your backend data, this is especially true in the world of mobile development. In this blog I'm going to show you how easy it is to provide a complete REST interface for your database by leveraging TopLink/EclipseLink and JDeveloper.

This relies on a capability that is available in TopLink 12c where every JPA entity that you have created can be RESTified with a simple servlet that TopLink provides.

All you need to do is locate the file toplink-dataservices-web.jar on your machine (this is included in the JDeveloper install so you can just search that directory) and then package your project as a WAR.

At that point you'll be able to get a complete CRUD set of operation for this entity.

In the video below I'm to retrieving departments by their id using a URL like this:

(out - name of my persistence unit. Departments - name of my entity) 

A complete list of all the REST URL syntax is here part of the TopLink documentation on this feature.:

Check out how easy the process is in this video (using MySQL database):

Here are some additional URL samples for getting other types of queries:

Get all the Employees -

Get all the Employees in department 50 -

Executing a specific named query (@NamedQuery(name = "Employees.findByName", query = "select o from Employees o where o.first_name like :name order by o.last_name"))  -;name=John

Categories: Development

ADF Faces Responsive Design - 12.1.3 Update

Wed, 2014-07-09 10:40

I while back I blogged about a technique for doing responsive design with JDeveloper 12.1.2 using media queries and css, but it is time for a small update for those who are using 12.1.3 - since there are some new capabilities that you can leverage.  (I would still recommend watching the other video as it shows some other things you can do with the same technique like changing the size of icons/fonts).

The major change in 12.1.3 is that you can now include your media query and style classes inside the skin definition. When you combine this with page templates you get very clean pages that don't need to include code for responsiveness.

See the demo below for how it works.

One note - in the houses demo I actually used a region that is replicated on the left side and in the panel drawer. This way you only need to code that part once.

Here is the code for the skin's css file:

.wide {

    display: inline;


.narrow {

    display: none;


@media screen and (max-width:950px) {

            .narrow {

                display: inline;


            .wide {

                display: none;



And here is the code for the page template:

 <?xml version='1.0' encoding='UTF-8'?>

<af:pageTemplateDef xmlns:af="" var="attrs" definition="private"

















    <af:panelGridLayout id="pt_pgl1">

        <af:gridRow marginTop="5px" height="auto" marginBottom="5px" id="pt_gr1">

            <af:gridCell marginStart="5px" width="20%" id="pt_gc1" >

            <af:panelGroupLayout layout="vertical" styleClass="wide">

                <af:facetRef facetName="right"/>



            <af:gridCell marginStart="5px" marginEnd="5px" width="80%" id="pt_gc2">

                <af:facetRef facetName="center"/>


            <af:gridCell  halign="stretch" width="auto" id="pt_gc3" >

            <af:panelGroupLayout layout="vertical" styleClass="narrow">

                <af:panelDrawer  id="pt_pd1" height="500px">

                    <af:showDetailItem id="dr1" shortDesc="Drawer 1">

                        <af:facetRef facetName="drawer"/>








As before you should also be setting the web.xml contextual parameter org.apache.myfaces.trinidad.DISABLE_CONTENT_COMPRESSION  =  true

Categories: Development

ADF Faces 12.1.3 Features Demo - Partial

Thu, 2014-06-26 12:35

The new Oracle ADF and JDeveloper 12.1.3 is out and it comes with a bunch of new features, especially in the UI layer - ADF Faces.

You can read the new features document on OTN, and you should also look into the new components demo for some inspiration.

For a quick overview of some of the new UI capabilities check out this quick video that shows some of the key new features.

<span id="XinhaEditingPostion"></span>

Categories: Development

Resolving Problems with the Embedded WebLogic in JDeveloper on Mac

Fri, 2014-06-20 10:03

Just a quick entry about something that I ran into in the past with JDeveloper, and that some of you who are using Mac might run into.

When you try and run your web application and the embedded WebLogic tries to start you might run into an error like:

Unrecognized option: -jrockit
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit. 

This is most likely due to the fact that JDeveloper is trying to use the wrong JVM to run your WebLogic.

To solve this - go into the system11. directory and locate the file.

Edit this file and add the following lines:



By doing this you'll instruct WebLogic to start with a regular JVM and not the JRockit variant which isn't on your mac. 

Categories: Development