👀 Views: 19 💬 Answers: 1 📅 Created: 2025-08-25

spring jpa generics Java

I'm refactoring my project and I'm working on a project and hit a roadblock..... I'm working with a strange scenario with Spring Data JPA while trying to set up a generic repository class. I created a base repository that is generic, and I want to extend it for specific entity types. However, when I define a repository for a specific entity, I encounter a `Parameterized type 'MyGenericRepository<T>' must be explicitly specified` behavior. Here's what I have set up: ```java import org.springframework.data.jpa.repository.JpaRepository; public interface MyGenericRepository<T, ID> extends JpaRepository<T, ID> { // Some generic methods } @Entity public class User { @Id private Long id; private String name; } public interface UserRepository extends MyGenericRepository<User, Long> { User findByName(String name); } ``` I expected this to work without any issues, but I keep getting the behavior when I try to run my application. I've also tried adding `@EnableJpaRepositories` to my main application class, but the behavior continues. Additionally, the `UserRepository` interface seems to be recognized by Spring, but the underlying implementation does not compile. I've checked my dependencies in `pom.xml`, and they look fine: ```xml <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>com.h2database</groupId> <artifactId>h2</artifactId> <scope>runtime</scope> </dependency> ``` Could this be a version compatibility scenario with Spring Data? I’m using Spring Boot 2.5.4 and Java 17. Any insights or suggestions on how to resolve this would be appreciated! This is happening in both development and production on CentOS. Hoping someone can shed some light on this.