Java Community | Help. Code. Learn.•5d ago

Spring data R2DBC without spring

Hi is there any replacement for spring-boot-starter-data-r2dbc with Guice? I'm mostly interested in something close to the ReactiveCrudRepository<> with R2DBC compatibility where it can just codegen a lot of boilerplate code.

11 Replies

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dan1st•5d ago

Isn't guice for dependency injection? Why would you use that with Spring and how does that relate to DB repositories?

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AnnabelleOP•5d ago

Code generation Crud repository generates mapping code to classes And also you can just define methods in interface and it will generate code for it based on args and also supports custom query over decorators Its not possible to use this library without spring I think. I tried for some time. But im looking if there are like different libraries that can do the same and work with Guice

dan1st•5d ago

but what code do you want to generate?

AnnabelleOP•5d ago

One sec I'll send example

dan1st•5d ago

If you want to generate custom code, there are ways to do it oh I didn't notice you want something without Spring If you want to generate code at compile-time, take a look at annotation processors While this is not what Spring does, it might be better for your use-case With that, you can find e.g. annotated interfaces and generate implementations of them or you could generate arbitrary classes

AnnabelleOP•5d ago

So for example I had this:

@Service
@Repository
public interface DiscordUserRepository extends ReactiveCrudRepository<DiscordUserDTO, UUID> {

    Mono<DiscordUserDTO> getDiscordUserById(UUID uuid);

    Mono<DiscordUserDTO> getDiscordUserBySpigotId(int uuid);

    Mono<DiscordUserDTO> getDiscordUserByDiscordId(String discordId);
}

@Service
@Repository
public interface DiscordUserRepository extends ReactiveCrudRepository<DiscordUserDTO, UUID> {

    Mono<DiscordUserDTO> getDiscordUserById(UUID uuid);

    Mono<DiscordUserDTO> getDiscordUserBySpigotId(int uuid);

    Mono<DiscordUserDTO> getDiscordUserByDiscordId(String discordId);
}

This all part of spring-boot-starter-data-r2dbc so for example if you use Spring bean and for example request DI for DiscordUserRepository I think it binds this interface to generated class internally. But I tried for example using the provided class R2dbcRepositoryFactory with factory.getRepository(T::class.java) But that gets me an error <TRepository> referenced from a method is not visible from class loader: 'app' This is a Guice error I kinda don't want to build my library for it.. Was checking to either hack spring-boot-starter-data-r2dbc to work or like find alternative that Is based on reactor-core. And I honestly don't mind if there are no libs that do code-gen I'm mostly looking into just having kind of a mini ORM like SQL builder or something like that to avoid having to write SQL in code directly. ------------ Okay, actually I got ReactiveCrudRepository to work For anyone interested in a solution how to get this working in Guice. First, you should be able to bind R2dbcRepositoryFactory instance can be createad with ConnectionFactories -> DatabaseClient-> R2dbcEntityTemplate -> R2dbcRepositoryFactory. In my case I just created a custom factory class since I inject my config from APP. You can create a custom Provider<T> where you just inject this factory and call getRepository, and this should just work for you without any issues. This did not work in my case since I have a logic that dynamically loads into custom ClassLoader, and if you have this case you can just call factory.setBeanClassLoader(classLoader) to set it to the custom class-loader you need. And this pretty much solved my issue.

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AnnabelleOP•5d ago

There is actually nothing special beside just creating R2dbcRepositoryFactory somewhere and calling getRepository These deps are only needed.

 <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>r2dbc-postgresql</artifactId>
            <version>${dep.r2dbc.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-r2dbc</artifactId>
            <version>${dep.r2dbc.spring.version}</version>
        </dependency>

 <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>r2dbc-postgresql</artifactId>
            <version>${dep.r2dbc.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-r2dbc</artifactId>
            <version>${dep.r2dbc.spring.version}</version>
        </dependency>

Just had issue where the Repository interface was not present in the java default class-loader which is only in my specific use-case and should work instantly without any other setup.

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Spring data R2DBC without spring

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