Detach & Attach Entities in Spring JPA Example

1. Introduction Spring Data JPA simplifies persistence by abstracting away Hibernate-specific boilerplate code. The org.springframework.data.jpa.repository.JpaRepository interface provides CRUD operations for…

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Inserting BLOB Using Spring JdbcTemplate Example

1. Introduction BLOB (Binary Large Object) is a large object data type in the database system. BLOB could store documents,…

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JavaScript Closure Examples

1. Introduction A closure in programming languages means that a function remembers variables from the outer (lexical) scope where it…

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Spring Data JPA Switch to AWS RDS Proxy Example

1. Introduction AWS RDS Proxy is a fully managed, highly available database proxy for Amazon Relational Database Service(RDS). It sits…

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HTTP Client From OpenAPI Spec And Spring Boot Example

1. Introduction OpenAPI ( formerly Swagger) provides a standard way to describe Rest APIs and OpenAPI Generator tool to generate…

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Mocking Logger and LoggerFactory Example

1. Introduction The SLF4J library provides the Logger interface and LoggerFactory utility class to create a logger instance for a…

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Lombok @Data and Final Fields Default Constructor Error Example

1. Introduction Lombok is an open-source Java library that generates getter, setter, toString, equals, hashCode, and constructors automatically to reduce common boilerplate code. The…

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Preventing Jackson from Fetching Lazy Entity Fields Example

1. Introduction The Spring Boot JPA project uses Jackson for JSON serialization. When Jackson serializes a JPA entity, it can…

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Deserialize to a Map with Correct Type Example

1. Introduction Deserialization is the process of converting data to Java objects. In this example, I will demonstrate how to…

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