How to set and use a kubeconfig in Kubernetes
The kubeconfig file is the main configuration file that allows access to a Kubernetes cluster.
When you first create your Kubernetes cluster, you are …
Read Article →Technical Articles
In-depth guides, insights, and best practices for modern software engineering
How to Map over a List of Lists in Java
The challenge
Write a function which maps a function over the lists in a list:
public static <T,R> R[][] gridMap(Function<T,R> fn, T[][] …How to Differentiate a Polynomial in Java
The challenge
Create a function that differentiates a polynomial for a given value of x.
Your function will receive 2 arguments: a polynomial as a …
Read Article →Find the Sums of Perfect Squares in Java
The challenge
The task is simply stated. Given an integer n (3 < n < 10<sup>9</sup>), find the length of the smallest list of …
[Solved] Error: Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.4.4:repackage (repackage)
If you have come across this error when trying to build and deploy your Spring Boot Maven application then this post will help you!
Error: Failed to …
[Solved] No main manifest attribute Solution for Jar/Maven/Gradle/Spring Boot
You’ve built a Java project and packaged a .jar file.
You are ready to run it outside your IDE, or deploy it somewhere.
When you run it using …
Read Article →[Solved] Error – The following untracked working tree files would be overwritten by merge
So you just tried to do a git pull and got the following error:
error: The following untracked working tree files would be overwritten by merge:
How …
Read Article →How to Strip Script Tags in PHP
If you have some HTML input submitted from a user to your application, before saving it to the database, you may want to strip all <script> tags …
How to Make a Spiral in Java
The challenge
Your task, is to create a NxN spiral with a given size.
For example, spiral with size 5 should look like this:
and with the size 10: …
Read Article →Find the Longest Common Subsequence in Java
The challenge
from Wikipedia:
The longest common subsequence (LCS) problem is the problem of finding the longest subsequence common to all sequences …
Find First and Last Position of Element in Sorted Array in Java
The challenge
Given an array of integers nums sorted in ascending order, find the starting and ending position of a given target value.
If target is …
Determine if Number is a Power of Three in Java
The challenge
Given an integer n, return true if it is a power of three. Otherwise, return false.
An integer n is a power of three, if there exists an …