Archive For The “How To” Category
And this is for Linux only. There is no short way to do this. It is not supported directly through the AWS Console where I can just push buttons and click away. It took SSH-ing to my Linux server. Typing in some terminal commands. Starting/stopping my EC2 instance a couple of times. However, it is…
Consider a List of Color objects with attributes of index, name and group. This object is defined as, Group is simply an Enum of, My list of colors are the following, Now, I want to divide these colors into their own sub-lists of color grouping based on the value of the object’s Group attribute. Traditionally,…
Say I have these numbers in an array, for example: I want to do something with that set of numbers, such as taking out null values, and extracting only the odd ones. Too take it further, maybe I want an even number or two mixed in the processed list as well. So I have this…
I recently started on the path on building content on the fly that gets sent out as soon as possible, using a template engine, but from a back-end perspective. If that makes sense? This is for an event-driven application that sits there and listens for incoming messages. A simple one. Consume the message as soon…
From time to time I get some of this odd API response from requesting information for a specific something. I expect the response data to be a simple JSON object. Instead I am looking at a JSON array. I suppose that is still simple enough and it’s not so odd. This kind of response happens…
Somebody asked me recently why their POJO validator was not working as expected. They had already followed the “code I wrote” down to a T. Emphasis on the quotes, because trust me that block of code for bean validation they used as reference from an older project I did, was pretty much a very trivial…
Part 2 – Accessing a Resource Recap This is a continuation of the previous post that I made some time last month. You can start reading from there to get more context – https://www.joseyamut.xyz/2021/02/24/spring-oauth2-using-password-grant-type-with-additional-headers The first part dealt with getting the access token from a 3rd party token service provider using a password grant. The…
Part 1 – Getting the Access Token In this example, I am using the older Spring Security library which is: spring-security-oauth2 The JAR file can be found at Maven public repositories here. Dependency For my case, I am specifically using the release version below because I am trying to match some limitations (Such as what…
Properties written in YAML format in my opinion reads better, far better for a human, especially when an application has tons of properties in there. Well, after all YAML was designed to be a human-readable data-serialization language. Officially it complies with JSON and is a subset of the latter (depends which version though as I’ve…
Not that long ago, I wrote about creating my own VPN (Virtual Private Network) for personal use with OpenVPN. In that post I also recounted how I used it for work purposes back when I was still in Singapore. That was several years ago. That time I had no issues connecting to the VPN server…
Now I have always thought about getting a VPN subscription for some time. Already researched a bit about it several times before. I always somehow keep on having second thoughts about getting one for several reasons that I won’t mention here. I’ve already implemented a VPN back when I was still in Singapore, using OpenVPN….
One of those people who is guilty of frequently relying on online 3rd party JSON formatting tools so messily formatted JSON strings or one-liners can be saner to read. If you are like me who deal with JSON almost every day for development, reading log messages, error tracing, etc., readability for JSON is a must….
How many countless times must I have found myself with a piece of JSON string that is formatted in a way that makes it very hard for me to read. Perhaps you’ve also experienced this several times too? As a back-end developer, having to deal with a lot of JSON is unavoidable. Heck, I deal…
The other day I was trying to assign a container of, let’s say, numbers distributed across 20 groups, to a container with a smaller size that can only hold up to 6 groups. The bigger group has values from 0 to 19. It also means that group 0 will always have zero number value, 1…
The other day, I was working on a huge JSON object that had a number of collections in it. The entire object had to be saved into a relational database, which means I was mapping out the raw JSON data to its logical representation as database tables. Though the object wasn’t that complicated, it did…