AutoSelect & Deselect Checkbox in ADF Tree Component

This post is about how to implement a use case having checkboxes in ADF Tree component. Below is the use case :

Use Case
There is an ADF Tree component using Departments as master and Employees as child. Departments acts as parent node and has all the child employees under it in the Tree. Departments as well as child employees should have checkbox. When user checks the checkbox of a department , all the checkboxes of the child employees should be autoselected. And when user deselects the department, they should be deselected.

Parent to Region Communication using Shared & Isolated DataControls

In this post we will look at how Parent and Region communications are done in ADF. We will take two cases in this post. One is when by default Task Flows are set to have Shared Data Control scope and the other one is when Task Flows are set to use Isolated Data Control Scope.

Below is the picture which depicts what we are targeting to achieve.

Unlocking HR Account in Oracle XE Database

In this post I will be showing the steps to how to unlock HR account in Oracle XE database. After some days, when you try to access HR schema, it says Account Locked. 

I always forget the steps in order to unlock the HR schema, so that's the reason I am writing this simple post.

Open command prompt and enter the command as follows :

sqlplus / as sysdba

This will not ask password and will open the SQL plus prompt.

Consuming SOAP Service without creating/using RequestVO/ResponseVO on Client Side

Many times in ADF/Webcenter implementation projects, consuming SOAP services is one of the requirement. Web Services are consumed in ADF by creating Web Service Data Control or by generating proxys.

Some of the services expect very few input parameters may be 2-4 but most of the Web Services expect more parameters. For services which expect more number of parameters, most of the times, all the input variables are a part of RequestVO POJO object. Since this RequestVO is required to provide input to the WebService, the structure with attributes of POJO or VO expected by the service needs to be shared to the client making the request.

For example, in this post we will be taking a simple example of EmployeeService.

Too Many Open Files Exception while running application on Unix

While working on client side and running Webcenter portal application on the Unix System, we saw exception stating : error = 24 , Too Many Open Files.

Caused by: java.io.IOException: java.io.IOException: error=24, Too many open files
    at java.lang.UNIXProcess.<init>(UNIXProcess.java:148)
    at java.lang.ProcessImpl.start(ProcessImpl.java:65)
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:453)
    ... 40 more

Could not create the Java Virtual Machine Unrecognized option: -jrockit

While working with a client, after client installed all the required softwares, WLS, Jdeveloper and JDK on the machines , there was an error which came up on starting integrated weblogic server from Jdeveloper. That error was something like below :-

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

Application Module Connection Sharing - Code Example Proof

There is a excellent and very informative video on AM Connection Sharing by Chris Muir where he describes how Multiple Root application modules due to sharing of ADF Library jars can be made to use single connection under the covers by using powerful feature of transaction management in task flows. Thanks to Chris for explaining this wonderful concept. Here is the link to the video AM Connection Sharing .

In this post we will see this powerful concept with the help of code example. Below is the concept:

"If there are multiple root AM's may be due to shared libraries, if task flows are used with default No Controller Transaction option, then there will be as many number of connections to DB as number of Root AM's. On the other hand if task flows in the application uses any of the three Transaction Option, then there will be Only Single connection to the DB be there any number of Root AM's , i.e. connection will be shared."