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Evaluating a Math Expression in Java

Learn how to evaluate math expressions expressed in String format in Java using exp4j, Javaluator, and the Java Scripting API.

Evaluation of Methods References in Java

Learn about Evaluation of Methods References in Java

REST With Spring for Teams

Level up the way your Team builds an API and the way you’re delivering it to your clients.

Learn Spring Security Core Course

The reference, in-depth dive into the core of Spring Security 6 and Boot 3, through the project-based lessons.

Learn Spring Security Course

The reference, in-depth dive into Spring Security 6 and Boot 3, with the full 88 project-based lessons.

Convert an Optional to an ArrayList in Java

Explore various approaches to converting Optional to ArrayList.

Using Reactor Mono.cache() for Memoization

In this tutorial, we learn about memoization and demonstrate how to use Mono.cache() from the Project Reactor.

OpenAPI Custom Generator

Learn the steps required to create a custom generator for the OpenAPI generator tool.

Fix Spring Boot H2 JdbcSQLSyntaxErrorException “Table not found”

This tutorial explores addressing the “Table not found” error in H2 databases, commonly encountered in Spring Boot applications. You can mitigate this issue by configuring H2, mapping entities, and managing data with JPA repositories.

How to Implement Elvis Operator in Java 8

Implement the Elvis operator in Java 8 using the Optional class and ternary operator.

Mapping Enum to String Using MapStruct

A quick tutorial on using MapStruct to convert enums to strings.

Converting Float ArrayList to Primitive Array in Java

Learn how to convert an ArrayList of wrapper classes into an array of primitives.

Compare the Numbers of Different Types

Learn how to compare primitives and numbers of different classes, such as Integers, Longs, and Floats.

Get Nextval From Sequence With Spring JPA

Explore a few approaches for fetching the next value from a database sequence using Spring Data JPA.

Continue the Test Even After Assertion Failure in TestNG

Learn how to make multiple assertions using TestNG’s SoftAssert and find out why that is a valuable tool for writing clean tests with reduced debugging time.