Restricting an ojInputText to accept only numbers

Oracle Jet is a beautiful toolkit for simplifying lot of tasks. ojInputText is a basic editor the framework provides, it can validate the text entered based on the regular expression we give, but validation only happens on blur and if we simply want to filter any keystrokes that don’t match that, we can’t do it by default.

Here is the result before we go and learn how to do it.

See the Pen Allow only numbers in OjInputText by Buddha (@jbuddha) on CodePen.

Ofcourse we can use ojInputNumber and use the example they gave for eating non-numbers, but what if we don’t want the increment and decrement the arrows of ojInputNumber. One way to do it is to bind a keyUp event and check everytime a character is pressed. Infact this is the approach that is used for the example given in OracleJet cookbook.

Here is an alternative approach using ojInputText. Instead of bindng to value, we can bind to rawValue attribute. This ensures that the observable gets updated on every keystroke.

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Generating the Jam Coins

The Problem

The Problem

Here is a moderate problem of CodeJam’s qualification round of 2016. The Jam Coins. Here is the description of the problem. You need to generate jamcoins of either 16 digits for small dataset or 32 digits for large datasets. Jam Coins follow the given rules…

  1. A Jam Coin is only made up of 1’s & 0’s of the required number of digits.
  2. It begins and ends with 1.
  3. If that interpreted from base 2 to base 10, it should not be a prime number in any of them.

For Small dataset, you need to generate 50 jam coins of 16 digits and for large dataset, you need to generate 500 jam coins of 32 digits following above rules.

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Disable DynAdmin authentication of Oracle Commerce

We use Dyn/Admin for many of the development related tasks of Oracle Commerce(ATG). However, the log-in ticket expires too frequently forcing us to enter credentials repeatedly. Some times we will also have to give both application server(weblogic/jboss) credentials and dynamo administration credentials. As we are not in a production critical environment where multiple people may access our DynAdmin and create issues, it is not necessary to have this security check every time we try to open DynAdmin of our development environment. I have found following solutions to be free of this issue. This can come in handy when we are doing active development and have to frequently access dynamo administration.

Solution 1 - Enable lazyAthentication

This approach works by enabling Lazy Athentication which means login will only be asked once per session. This means, as long as the session is not expired, dyn/admin will not ask for credentials again.

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Open Source Patch Utility For Perforce

Perforce is a proprietary version controlling system. It has been around for more than 20 years. However, one glaring limitation always bugs the users. The inability to generate proper diff files.
Where is my patch?
I can anticipate what is going on in your mind, we can generate a diff file by using the command line interface. p4 diff helps us generate a diff file. However if you ever had a misfortune of trying to generate patch files on regular basis. You would understand the pain. It works fine as long as you just modify existing files. However, if you have new files added to the workspace to be checked into to the depot, you quickly run out of luck. One more problem is that you can’t control the files included in the diff file based on change list. It gives you diff file for all the files that are modified. Of course, you can give individual file names, but you have to repeat it either one by one or by using common wildcard. To overcome this, I have come up with a simple JavaFX utility. Using this utility is as simple as it can get.

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Hello World for Oracle Commerce (ATG)

There are so many concepts in Oracle Commerce (previously known as ATG), that makes coming up with Hello World program little difficult. Do you mean to create one JSP page and deploy it like commerce reference store? Do you want to create a component just to see in Dyn/Admin? Do you want to create a hello world repository? Depending on what you want to do, the approach to take will be different.
Too many options to begin with
To work with Oracle Commerce, you don’t have to know about persisting data in database. If you approach Oracle Commerce programming with J2EE & MVC experience, you may find it little difficult to cope with it unless you start with a fresh mind, because things are very different in this platform.

Today, I will demonstrate how to create a simple component so that it can be viewed in Dyn/Admin. Let us assume that you are trying to create it in your own module instead of existing module like DAS or DAF. Follow the the steps shown below.

Step 1: Create an Eclipse project

Create an Eclipse project and make sure you add all the necessary class files to the build path. Add classes.jar or DAS at the least.

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