JPA
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Core Java
JPA Inheritance vs Composition Spring Boot Example
1. Introduction Inheritance is an “IS-A” type of relationship in object-oriented programming (OOP). Inheritance is tightly coupled since child classes…
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Core Java
Resolving PostgreSQL JSON Type Mismatch Errors in JPA
When working with PostgreSQL and Java Persistence API (JPA), you might encounter a common error related to JSON data types.…
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Enterprise Java
How to Fix PSQLException Operator Does Not Exist Character Varying = UUID
When working with Spring JPA and PostgreSQL, you might encounter an error like PSQLException: Operator Does Not Exist: character varying…
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Core Java
Fixing the JPA “Could Not Determine Recommended JdbcType for Class” Error
When working with Hibernate and Jakarta Persistence API (JPA), you might encounter the error: Could not determine recommended JdbcType for…
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Enterprise Java
Integrating Java Enums with JPA and PostgreSQL Enums
Enums are a powerful feature in Java, allowing us to define a fixed set of constants. When using JPA (Java…
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Enterprise Java
Using Enum in Spring Data JPA Queries
When constructing our persistence layer using Spring Data JPA, we frequently deal with entities that contain enum fields. These enum…
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Enterprise Java
Resolving Spring Boot H2 JdbcSQLSyntaxErrorException: “Table not found”
Spring Boot makes it easy to develop Spring applications with its pre-configured components. However, we often encounter the JdbcSQLSyntaxErrorException: Table…
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Enterprise Java
Automatically Saving Child Entities in JPA
In JPA applications, we often encounter entities with parent-child relationships. Persisting these entities efficiently involves saving the parent and automatically…
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Enterprise Java
Querydsl vs. JPA Criteria
Querydsl and JPA Criteria are widely used frameworks for creating type-safe queries in Java. Both offer methods to express queries…
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