Supabase-storage installation problem - Kotlin / Spring Boot

[Nico-GS]

Hello,

I have a Kotlin Spring Boot project.
I'm trying to install supabase storage but I'm having problems

Here is my Supabase configuration file:

@Configuration
class SupabaseConfiguration {
    @Bean
    fun supabaseClient(): SupabaseClient {
        return createSupabaseClient(
            supabaseUrl = "http://XX.XX.XX.XX:8000/",
            supabaseKey = "XXXXX"
        ) {
            install(Auth)
            install(Postgrest)
            install(Storage) {
                transferTimeout = 90.seconds // Default: 120 seconds
            }
            defaultSerializer = KotlinXSerializer(Json)
        }
    }
}

I use the Supabase client in my service :

@Service
class BucketService(

) {
    @Autowired
    private lateinit var supabaseClient: SupabaseClient

    suspend fun getBucketById(): String {
        val bucket = supabaseClient.storage.retrieveBucketById("data") ?: throw IllegalArgumentException("No data found")
        return bucket.name
    }

}

The error occurs when I try to call my endpoint :

Error: (Supabase-Core) GET request to endpoint /storage/v1/bucket/data failed with exception Parameter specified as non-null is null: method io.ktor.client.engine.apache5.BasicResponseConsumer.consumeResponse, parameter httpContext
java.lang.NullPointerException: Parameter specified as non-null is null: method io.ktor.client.engine.apache5.BasicResponseConsumer.consumeResponse, parameter httpContext

I think it must come from the Ktor configuration
I just put the dependencies in my pom.xml
Any idea ?

Thanks

[jan-tennert]

1. Which Ktor version are you using?
2. You are using a relatively old supabase-kt version

[Nico-GS]

Okay it's working now !!! At least for the configuration
I have these versions :

        <dependency>
            <groupId>io.github.jan-tennert.supabase</groupId>
            <artifactId>supabase-kt-jvm</artifactId>
            <version>2.5.3</version>
        </dependency>

        <dependency>
            <groupId>io.github.jan-tennert.supabase</groupId>
            <artifactId>storage-kt-jvm</artifactId>
            <version>2.5.3</version>
        </dependency>

        <dependency>
            <groupId>io.ktor</groupId>
            <artifactId>ktor-client-core</artifactId>
            <version>2.3.5</version>
        </dependency>

        <dependency>
            <groupId>org.reactivestreams</groupId>
            <artifactId>reactive-streams</artifactId>
            <version>1.0.4</version>
        </dependency>

        <dependency>
            <groupId>io.projectreactor</groupId>
            <artifactId>reactor-core</artifactId>
            <version>3.7.0</version>
        </dependency>

        <dependency>
            <groupId>org.jetbrains.kotlinx</groupId>
            <artifactId>kotlinx-coroutines-reactor</artifactId>
            <version>1.7.3</version>
        </dependency>

        <dependency>
            <groupId>io.ktor</groupId>
            <artifactId>ktor-client-plugins</artifactId>
            <version>3.0.3</version>
        </dependency>
        <dependency>
            <groupId>io.ktor</groupId>
            <artifactId>ktor-client-okhttp-jvm</artifactId>
            <version>2.3.5</version>
            <scope>implementation</scope>
        </dependency>

I can't get Supabase version 3.0.3 to work, even with higher versions of Ktor OkHttp.

And now i have securities problem :

Error creating bucket: new row violates row-level security policy

Thanks for the help !

[jan-tennert]

You need to configure RLS. But with your new dependencies, you are now mixing different ktor major versions? Doesn't that work?: (With only these dependencies)

        <dependency>
            <groupId>io.github.jan-tennert.supabase</groupId>
            <artifactId>supabase-kt-jvm</artifactId>
            <version>3.0.3</version>
        </dependency>
        <dependency>
            <groupId>io.github.jan-tennert.supabase</groupId>
            <artifactId>storage-kt-jvm</artifactId>
            <version>3.0.3</version>
        </dependency>
        <dependency>
            <groupId>io.ktor</groupId>
            <artifactId>ktor-client-okhttp-jvm</artifactId>
            <version>3.0.3</version>
        </dependency>

Note: That the Supabase and Ktor version match is coincidental

[Nico-GS]

It doesn't work with just the three libs you mention :

Failed to find HTTP client engine implementation: consider adding client engine dependency. See https://ktor.io/docs/http-client-engines.html

[jan-tennert]

Hmm, maybe a Maven thing I don't know but for your other issue, you need to configure your RLS

[Nico-GS]

Yes i'll do that.
Thanks for the help ! I will stay with these version for the moment.