Using with Java
This article describes how to use Apollo Kotlin in Java projects.
Use the Java codegen
Apollo Kotlin generates Kotlin code by default, but you can configure it to use the Java codegen instead:
build.gradle[.kts]
apollo {service("service") {generateKotlinModels.set(false)}}
Build the client
This snippet demonstrates initializing an ApolloClient
instance in Java:
import com.apollographql.apollo3.cache.normalized.NormalizedCache;import com.apollographql.apollo3.cache.http.HttpCache;// (...)ApolloClient.Builder builder = new ApolloClient.Builder().serverUrl("http://localhost:4000/graphql")// Optionally, set an http cacheHttpCache.configureApolloClientBuilder(builder, cacheDirectory, cacheMaxSize);// Optionally, set a normalized cacheNormalizedCache.configureApolloClientBuilder(builder,new MemoryCacheFactory(10 * 1024 * 1024, -1),TypePolicyCacheKeyGenerator.INSTANCE,FieldPolicyCacheResolver.INSTANCE,false);ApolloClient client = builder.build();
Use RxJava extensions
Apollo Kotlin has a coroutines / Flow-based API that isn't well suited to using with Java. To achieve a similar effect, you can use Apollo's RxJava extensions.