DGS at Scale: Testing, Schema Evolution, and Federation
Part 5 of the Production GraphQL series — unit testing DGS components with Spock, evolving your GraphQL schema without breaking clients, and federating multiple services into a unified graph.
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Virtual Threads Did Not Kill WebFlux
Java 21 virtual threads solve thread scalability for blocking code. WebFlux solves backpressure, streaming, and event-driven composition. They are not competitors — they solve different problems, and the 'WebFlux is dead' take is dangerously wrong.
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Securing Your GraphQL API with Netflix DGS
Part 3 of the Production GraphQL series — authentication and authorization with @PreAuthorize, error sanitization to prevent information leakage, and query depth and complexity limits to stop abuse.
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Testing Axon 5 Aggregates with Spock: A Practical Guide
How to test Axon 5 aggregate state machines using Spock and AxonTestFixture — from creation commands to guard clause rejections, with practical patterns for event chaining, timestamp handling, and injected services.
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Solving N+1 with Data Loaders and Field Resolvers
Part 2 of the Production GraphQL series — how DGS data loaders batch database calls to eliminate the N+1 problem, when to use MappedBatchLoader vs BatchLoader, and pagination patterns for GraphQL APIs.
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Schema-First GraphQL with Netflix DGS
Part 1 of the Production GraphQL series — how Netflix DGS and Spring for GraphQL merged into one stack, schema-first development patterns, code generation, and the three-layer type system that keeps your API maintainable.
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The Silent Metadata Gap: Why Your Axon 5 Events Have No User Attribution
Command metadata doesn't automatically propagate to events in Axon Framework 5. Here's how CorrelationDataProvider fixes the silent data loss — and why it's so hard to catch.
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Your MCP Server Works Locally. Then Kubernetes Kills the Session.
How we debugged intermittent 'Session not found' errors in a Spring AI MCP server on GKE — and why switching to stateless transport is the right answer for Kubernetes deployments.
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Propagating User Identity in Axon 5 Query Handlers
Why ReactiveSecurityContextHolder is always empty inside Axon query handlers, three approaches we considered, and the Axon MetaData solution that keeps query objects clean.
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Migrating from Axon Framework 4 to 5: What We Learned
A hands-on account of migrating a CQRS/ES application from Axon Framework 4.12 to 5.0 — the API upheaval, replacing sagas with stateful event handlers, and the reactive payoff.
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