We’ve got a Java service hitting the Genesys API for real-time stats. Using the default SDK client, it works fine locally but throws java.net.SocketTimeoutException in prod when concurrent requests spike above 50. Suspect the underlying Apache HttpClient pool is too small. Tried setting setConnectionPoolSize(100) on the config builder, but the timeout persists. Is there a specific way to tune the thread-safe HTTP client settings in the SDK without dropping down to raw OkHttp?
I’ve seen this exact behavior in our CI/CD pipelines when the default SDK client gets hammered. The setConnectionPoolSize method you mentioned actually doesn’t exist on the standard Configuration builder in the Java SDK. It’s likely you’re looking at a cached property or a different library.
The real issue is usually that the SDK creates a new HTTP client instance for every request if you aren’t managing the lifecycle correctly, or the default pool size is just too small for 50+ concurrent threads. You need to inject a pre-configured ApacheHttpClient into the SDK configuration.
Here is how I handle it in our routing validation services. You create a custom PoolingHttpClientConnectionManager and pass it into the Configuration.Builder. This ensures the connections are reused and the pool scales properly.
import com.genesyscloud.platform.client.Configuration;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
// 1. Define your pool settings
PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager();
connectionManager.setMaxTotal(200); // Total max connections across the pool
connectionManager.setDefaultMaxPerRoute(50); // Max connections per host (Genesys Cloud endpoints)
// 2. Build the SDK configuration with the custom manager
Configuration config = Configuration.Builder
.withClientId("YOUR_CLIENT_ID")
.withClientSecret("YOUR_CLIENT_SECRET")
.withRegion("us-east-1") // Adjust for Europe/London if needed, usually us-east-1 or eu-west-1
.withHttpClientConnectionManager(connectionManager) // This is the key fix
.build();
// 3. Create a SINGLE instance of the API client and reuse it
AnalyticsConversationApi analyticsApi = new AnalyticsConversationApi(config);
Don’t create a new AnalyticsConversationApi object inside your request handler. That kills performance instantly. Make it a singleton or a static final field if you’re using a simple service. Also, check your thread pool settings in Tomcat or Jetty. If your app server only has 20 threads but you’re trying to push 50 concurrent API calls, the SDK pool size won’t matter because the application threads are waiting in line anyway.
I usually set setMaxTotal to about 2-3 times the expected peak concurrency just to be safe. The SocketTimeoutException often masks itself as a pool issue but can also be caused by DNS resolution delays in some AWS subnets. If the above doesn’t fix it, try increasing the connectTimeout and readTimeout on the HttpClientConfig builder before passing it to the SDK.