Jackson deserialization using a multi-parameter constructor

JSON deserialization is a common requirement in modern applications that interact with APIs and external systems. Handling different object creation…

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The Hidden Cost of Records: When Java Records Break Your Serialization, JPA, and Reflection-Heavy Code

Records are now a mainstream Java feature — clean, concise, and genuinely useful. But the introductory tutorials skip the part…

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Jackson MongoDB POJO Mapping Example

In Java-based applications using MongoDB, converting data between MongoDB’s native document representation and Java Plain Old Java Objects (POJOs) is…

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Java JSON to POJO Conversion

JSON is a lightweight format used for data exchange between systems. In Java, mapping JSON to a POJO makes your…

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Java Jersey & Jackson ObjectMapper Example

When building REST APIs with Jersey (a JAX-RS implementation) and Jackson for JSON serialization, developers often need to customize how…

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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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Static ObjectMapper in Java: Performance and Design Considerations

Jackson’s ObjectMapper is a versatile and flexible tool for JSON processing in Java. However, how you manage its lifecycle, whether…

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How to Dynamically Ignore Fields in Jackson

Jackson is a popular Java library for JSON processing. Sometimes, we need to ignore fields dynamically at runtime instead of…

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