Technical Writing

May 6, 2026 AWS

Managing Secrets Securely with AWS Secrets Manager and Spring Boot

How to load secrets from AWS Secrets Manager into Spring Boot at startup, wire IAM least-privilege access, enable automatic rotation, and avoid the common configuration anti-patterns.

Java Spring Boot AWS

May 5, 2026 Java

Optional Done Right — Patterns That Actually Improve Readability

The Optional patterns that improve readability and the anti-patterns that make code worse — covering map, flatMap, or, ifPresentOrElse, and stream() with Java 9+ additions.

Java Functional Programming

May 4, 2026 Betfair

Parsing Best Available to Back and Lay Prices from the Streaming API

How the Betfair Streaming API represents best available back and lay prices, how delta updates work, and how to reconstruct a clean order book view in Java without the full ladder overhead.

Java Betfair Trading

May 3, 2026 Spring Boot

Custom Health Indicators with Spring Boot Actuator

How to write custom HealthIndicator and CompositeHealthContributor implementations in Spring Boot Actuator — with real examples for external service checks and IAM-aware AWS dependencies.

Java Spring Boot Observability

May 2, 2026 Spring Boot

Exception Handling with @ControllerAdvice and RFC 7807 Problem Details

How to build consistent, standards-compliant error responses in Spring Boot 3 using @ControllerAdvice and the RFC 7807 ProblemDetail class.

Java Spring Boot REST API

May 1, 2026 Spring Boot

@ConfigurationProperties — Type-Safe Configuration Done Right

How to replace @Value sprawl with @ConfigurationProperties for type-safe, validated, and testable configuration in Spring Boot microservices.

Java Spring Boot Configuration

Apr 30, 2026 AWS

Provisioning Cloud Infrastructure with CDK for Java

How to define, deploy, and manage AWS infrastructure using the CDK for Java — stacks, constructs, environment separation, and the patterns that make CDK codebases maintainable at scale.

Java AWS CDK

Apr 29, 2026 Spring Boot

Real-Time Stream Processing with Kafka Streams

How to build real-time stream processing pipelines with Kafka Streams and Spring Boot — the Streams DSL, stateful operations, KTable joins, windowing, exactly-once processing, and production topology design.

Java Spring Boot Apache Kafka

Apr 28, 2026 Betfair

In-Play Trading Architecture — How Everything Changes at the Off

How the architecture of an automated Betfair trading system must change when transitioning from pre-race to in-play — latency requirements, signal sources, order management constraints, and the state machine that keeps it safe.

Java Betfair Trading

Apr 27, 2026 Betfair

Handling Market Suspension and Streaming Reconnection in Java

How to handle Betfair Streaming API disconnections, market suspensions, and state recovery correctly in Java — connection lifecycle management, exponential backoff reconnection, market status tracking, and safe order management during suspension.

Java Betfair Trading

Apr 26, 2026 Kubernetes

Health Probes and Spring Boot Actuator — Getting Them Right

How to wire Kubernetes liveness, readiness, and startup probes to Spring Boot Actuator health endpoints — and avoid the configuration mistakes that cause unnecessary pod restarts.

Java Spring Boot Kubernetes

Apr 25, 2026 Spring Boot

Distributed Locking with Redis — Preventing Concurrent Execution

How to use Redis-backed distributed locks to prevent duplicate execution across multiple application instances — with Redisson and Spring Integration.

Java Spring Boot Redis

Apr 24, 2026 Spring Boot

Graceful Shutdown — Draining Requests Before the JVM Exits

How to configure Spring Boot graceful shutdown correctly, what it protects against, and how to wire it safely with Kubernetes terminationGracePeriodSeconds.

Java Spring Boot Production

Apr 23, 2026 Betfair

Commission Modelling — Calculating True Net P&L

How Betfair commission really works — market base rate, Premium Charge, discount tiers — and how to model it correctly in a Java P&L calculator.

Betfair Trading Java

Apr 22, 2026 JPA

Performance Tuning — Solving the N+1 Query Problem for Good

How to identify and eliminate the N+1 query problem in JPA/Hibernate applications before it reaches production.

Java JPA Hibernate

Apr 21, 2026 Spring Batch

Processing Large Datasets Without Killing Your Database

A practical guide to Spring Batch for bulk data processing — chunk-based processing, JdbcCursorItemReader, skip and retry policies, restartability, and parallel partitioning at scale.

Java Spring Batch Performance

Apr 20, 2026 Spring Boot

Transaction Management Deep Dive

A thorough guide to Spring transaction management — how @Transactional actually works, propagation behaviours, common failure modes, transaction boundaries with MongoDB and JPA, and the patterns that keep complex services correct under failure.

Java Spring Boot MongoDB

Apr 19, 2026 Reflections

A Year of Java Posts — What I've Learned and What's Next

Reflecting on a year of writing about Java, Betfair trading systems, and software architecture — what resonated, what I got wrong, and what's ahead.

Java Career Software Development

Apr 18, 2026 Java

Pattern Matching — instanceof and Switch Expressions Done Right

A practical guide to pattern matching in modern Java — instanceof pattern variables, guarded patterns, switch expressions, sealed classes, and record patterns done properly.

Java Pattern Matching Modern Java

Apr 17, 2026 Betfair

In-Play Betting Automation — Latency, Execution, and Survival

The reality of automated in-play betting on Betfair — API vs Streaming API latency, market suspension cascades, hedging open positions, and building a Java system that survives the chaos.

Java Betfair In-Play

Apr 16, 2026 Betfair

BSP Starting Price — How It Works and How to Trade Around It

A practical guide to Betfair Starting Price — how the BSP algorithm works, when to use it, how to place BSP bets via the API, and how to use BSP as a model performance benchmark.

Betfair BSP Trading

Apr 15, 2026 Spring Boot

@Async — Offloading Work Without Blocking the Request Thread

How to use @Async in Spring Boot correctly — including the executor configuration, exception handling, and the proxy gotcha that trips everyone up.

Java Spring Boot Async

Apr 14, 2026 Architecture

The Twelve-Factor App Applied to Spring Boot

Applying the Twelve-Factor App methodology to Spring Boot microservices — what each factor means in practice, how Spring Boot supports it, and where developers commonly go wrong.

Java Spring Boot Architecture

Apr 13, 2026 Java

ExecutorService and Thread Pools — Getting Concurrency Right

Stop creating raw threads. Learn how to size and manage Java thread pools correctly, avoid Future.get() traps, and use CompletableFuture for everything new.

Java Concurrency Threading

Apr 12, 2026 AWS

SQS Messaging Patterns for Spring Boot Microservices

Practical SQS patterns for Spring Boot microservices — standard vs FIFO queues, @SqsListener, dead letter queues, idempotency, and visibility timeout tuning.

AWS SQS Spring Boot

Apr 11, 2026 Java

Enums as State Machines — Beyond Simple Constants

Use Java enums to build self-contained, type-safe state machines with validated transitions and behaviour attached directly to each state.

Java Design Patterns Architecture

Apr 10, 2026 AWS

Deploying Spring Boot to AWS ECS with Fargate

A practical guide to deploying containerised Spring Boot applications on AWS ECS with Fargate — Dockerfile, ECR, task definitions, ALB, Parameter Store, and GitHub Actions CI/CD.

Java Spring Boot AWS

Apr 9, 2026 Spring Boot

WebClient — Reactive HTTP Without the Complexity

How to use Spring WebClient as a modern, non-blocking replacement for RestTemplate — including when it's fine to just call .block().

Java Spring Boot WebClient

Apr 8, 2026 Betfair

Greening Up — Locking In Profits Before the Off

How to implement greening up on Betfair in Java — the maths, a GreenUpCalculator class, when to trigger it, handling partial greens, rounding, and the edge cases that catch out new traders.

Betfair Trading Java

Apr 7, 2026 Betfair

Integrating Live Sports Data Feeds with Betfair Java Systems

How to integrate live sports data feeds alongside Betfair market data in Java — correlating events to markets, consuming score signals, and meeting in-play latency requirements.

Java Betfair Sports Data

Apr 6, 2026 Java

The Java Time API — A Practical Field Guide

A no-nonsense guide to java.time — when to use LocalDate vs ZonedDateTime vs Instant, how to handle timezones correctly, formatting, Jackson serialisation, and the pitfalls to avoid.

Java Date and Time Best Practices

Apr 5, 2026 Java

MapStruct — Eliminating DTO Mapping Boilerplate

How MapStruct's annotation processor generates type-safe, compile-time DTO mapping code — removing the fragile handwritten boilerplate that breaks silently when your model changes.

Java MapStruct Spring Boot

Apr 4, 2026 Java

Foreign Function and Memory API — Project Panama Explained

How to use Java 21's Foreign Function and Memory API — MemorySegment, Arena, native function calls via MethodHandles, jextract, and when to use FFM over JNI or JNA.

Java Java 21 Project Panama

Apr 3, 2026 Architecture

The Saga Pattern for Distributed Transactions with Kafka

How to implement the Saga pattern for distributed transactions in Java with Kafka — choreography vs orchestration, compensating transactions, state tracking, and the failure modes that trip up every first implementation.

Java Spring Boot Apache Kafka

Apr 2, 2026 AWS

Lambda SnapStart — Java Cold Start Solved?

What Lambda SnapStart actually does, how to configure it for Java, what changes in your application code to make it work correctly, and whether it actually solves the Java cold start problem in practice.

Java AWS Lambda

Apr 1, 2026 Betfair

Reading Ladder Depth — Beyond the Top 3 Levels

How to read and analyse full ladder depth from the Betfair Streaming API in Java — representing the full order book, detecting iceberg orders, measuring liquidity distribution, and using depth signals that the top 3 levels miss.

Java Betfair Trading

Mar 31, 2026 Betfair

Market Liquidity Analysis — Measuring Tradable Depth in Java

How to measure real-time market liquidity on Betfair in Java — available depth, spread analysis, matched volume, liquidity build patterns, and minimum thresholds for safe automated trading.

Java Betfair Liquidity

Mar 30, 2026 Kafka

Consumer Offset Management and Commit Strategies in Spring Boot

How Kafka consumer offsets work, the trade-offs between auto and manual commit, and how to implement at-least-once and exactly-once semantics correctly in a Spring Boot consumer.

Java Kafka Spring Boot

Mar 29, 2026 Betfair

Large Order Detection from Ladder Depth in Java

How to detect large orders and sudden liquidity changes in the Betfair Exchange ladder, what the signals mean for price movement, and how to implement the detection logic in Java.

Java Betfair Trading

Mar 28, 2026 Spring Boot

Structuring a Multi-Module Maven Project

How to structure a Spring Boot application as a multi-module Maven project — parent POM, dependency management, module layout, and keeping the domain module dependency-free.

Java Spring Boot Maven

Mar 27, 2026 Betfair

Building a Backtesting Framework for Trading Strategies in Java

How to build a Betfair backtesting framework in Java — streaming data replay, realistic order fill simulation, P&L tracking, Sharpe ratio, and the limitations you must understand.

Java Betfair Backtesting

Mar 26, 2026 Architecture

Idempotency Patterns in Event-Driven Java Systems

How to implement idempotency in event-driven Java systems — idempotency keys, at-least-once delivery, the outbox pattern, Redis deduplication, and Kafka consumer patterns.

Java Architecture Idempotency

Mar 25, 2026 Java

CompletableFuture vs Virtual Threads — Choosing the Right Async Model

When to use CompletableFuture vs Java 21 virtual threads — comparing programming models, error handling, debugging, and performance for real concurrent IO workloads.

Java Java 21 CompletableFuture

Mar 24, 2026 Betfair

Multi-Exchange Abstraction — Betfair, Betdaq, and Smarkets in One Framework

How to design a Java trading framework that targets Betfair, Betdaq, and Smarkets through a common abstraction — covering adapters, data normalisation, and unified order management.

Java Betfair Betdaq

Mar 23, 2026 Betfair

Handling Non-Runners and Reduction Factors in the Streaming API

How the Betfair Streaming API signals non-runner removals, how reduction factors work, and how to update open positions and historical signals correctly when a runner is withdrawn.

Java Betfair Trading

Mar 22, 2026 Spring Boot

Consumer-Driven Contract Testing with Spring Cloud Contract

Consumer-driven contract testing with Spring Cloud Contract — covering the contract DSL, stub generation, stub runner, and integrating contract verification into CI/CD pipelines.

Java Spring Boot Spring Cloud Contract

Mar 21, 2026 Testing

BDD with Cucumber and Spring Boot

How to use Cucumber for Behaviour-Driven Development in Spring Boot — covering feature files, step definitions, Spring context wiring, shared state, and Testcontainers.

Java Spring Boot Cucumber

Mar 20, 2026 Spring Boot

Distributed Caching with Redis and Spring Cache

How to implement distributed caching in Spring Boot with Redis — @Cacheable, cache configuration, TTL strategies, cache-aside pattern, eviction, and the failure modes that catch teams out in production.

Java Spring Boot Redis

Mar 19, 2026 Betfair

Building a Market Data Recorder in Java

How to build a Betfair market data recorder in Java — capturing live Streaming API data to disk for backtesting, replay, and strategy analysis.

Java Betfair Data Recording

Mar 18, 2026 Java

SequencedCollections and Modern Collection APIs in Java 21

Java 21's SequencedCollection, SequencedSet, and SequencedMap — getFirst, getLast, reversed, and the modern collection utilities that tidy up everyday Spring Boot application code.

Java Java 21 Collections

Mar 17, 2026 Spring Boot

Spring Cloud Gateway — API Gateway Patterns

Building an API gateway with Spring Cloud Gateway — route configuration, predicates, filters, Redis rate limiting, circuit breaking, auth forwarding, and when a gateway adds value vs complexity.

Java Spring Boot Spring Cloud Gateway

Mar 16, 2026 DevOps

CI/CD for Spring Boot Microservices with GitHub Actions

How to build a production-grade CI/CD pipeline for Spring Boot microservices using GitHub Actions — build, test, Docker image publishing, environment promotion, and the patterns that keep pipelines fast and reliable.

Java Spring Boot GitHub Actions

Mar 15, 2026 Testing

Testcontainers for Kafka — Real Broker Integration Tests

How to write real Kafka integration tests in Spring Boot using Testcontainers — spinning up a real broker, testing producers and consumers end-to-end, verifying exactly-once behaviour, and structuring tests that are fast and reliable.

Java Spring Boot Apache Kafka

Mar 14, 2026 Betfair

Efficient Market Filtering and Catalogue Queries in Java

How to query the Betfair catalogue API efficiently in Java — filtering markets by event type, competition, time window, and status, caching catalogue data, and structuring queries to stay within API rate limits.

Java Betfair Trading

Mar 13, 2026 Betfair

Price Velocity and Market Momentum in Java

How to calculate price velocity and market momentum from Betfair Streaming data in Java — tracking LTP movement rate, detecting steam and drift signals, and combining velocity with Weight of Money for a composite entry signal.

Java Betfair Trading

Mar 12, 2026 Betfair

API Rate Limiting — Managing Quotas in High-Frequency Systems

How to manage Betfair API rate limits in a Java trading system — data request quotas, charge model, request batching, the Streaming API, and monitoring quota usage in production.

Java Betfair Rate Limiting

Mar 11, 2026 Architecture

Saga Pattern for Distributed Transactions in Spring Boot

Implementing the Saga pattern for distributed transactions in Spring Boot with Kafka — choreography vs orchestration, compensating transactions, failure handling, and saga state persistence.

Java Spring Boot Saga

Mar 10, 2026 Java

Performance Profiling with JDK Flight Recorder and Mission Control

Use JDK Flight Recorder and Mission Control to profile Java services in production — flame graphs, allocation hotspots, lock contention, and GC analysis with near-zero overhead.

Java Performance JFR

Mar 9, 2026 Spring Boot

Testing REST Controllers with @WebMvcTest and MockMvc

How to test Spring Boot REST controllers in isolation using @WebMvcTest and MockMvc — without starting a full server — covering request building, response assertions, and security wiring.

Java Spring Boot Testing

Mar 8, 2026 Java

Text Blocks, String Templates, and Modern String Handling

How Java text blocks and string templates clean up multi-line strings, SQL, JSON, and HTML — with practical examples for Spring Boot and API clients.

Java Java 21 Text Blocks

Mar 7, 2026 Matchbook

Integrating the Matchbook Exchange API in Java

A practical guide to integrating with the Matchbook Exchange API in Java — authentication, REST client setup, placing and managing orders, reading market prices, and the key differences from the Betfair API.

Java Matchbook Trading

Mar 6, 2026 Testing

Mutation Testing with PITest in Java

What mutation testing reveals that code coverage misses, how to configure PITest in a Java Spring Boot project, and how to act on surviving mutants effectively.

Java Testing PITest

Mar 5, 2026 Apache Kafka

Consumer Patterns — Idempotency and Exactly-Once Processing

Building idempotent Kafka consumers in Java — deduplication patterns, idempotency keys, outbox integration, and when to reach for Kafka transactions.

Java Apache Kafka Idempotency

Mar 4, 2026 Java

Immutable Design Beyond Records — Defensive Copies, Value Objects, and Wither Methods

A practical guide to immutable design in Java — when to use records, when to write manual value objects, how to handle collections correctly, and the wither pattern for clean modification.

Java Architecture DDD

Mar 3, 2026 Betfair

Market Suspension Handling in Java Trading Systems

How to handle Betfair market suspension events correctly in a Java trading system — state machines, safe position management, and re-entry logic after resumption.

Java Betfair Trading

Mar 2, 2026 Betfair

API Authentication and Non-Interactive Login from Java

How to authenticate with the Betfair Exchange API from a server-side Java application using certificate-based non-interactive login, session token management, and automatic renewal.

Java Betfair Trading

Mar 1, 2026 Spring Boot

Spring Security — JWT Authentication for REST APIs

How to implement stateless JWT authentication in Spring Boot REST APIs — filter chain, token generation, validation, refresh tokens, and role-based access control.

Java Spring Boot Spring Security

Feb 28, 2026 AWS

RDS PostgreSQL with IAM Authentication and SSL in Spring Boot

How to connect a Spring Boot service to RDS PostgreSQL using IAM database authentication instead of a static password — eliminating credentials from configuration and enabling automatic rotation.

Java Spring Boot AWS

Feb 27, 2026 Betfair

Overround Calculation and Market Efficiency Scoring in Java

How to calculate the overround on a Betfair Exchange market, what it tells you about market efficiency, and how to build an efficiency score that filters for trading opportunities in Java.

Java Betfair Trading

Feb 26, 2026 Spring Boot

Graceful Shutdown and Zero-Downtime Rolling Deploys

How to configure Spring Boot graceful shutdown to drain in-flight requests before terminating, and what Kubernetes lifecycle hooks and readiness probes you need for zero-downtime rolling deploys.

Java Spring Boot DevOps

Feb 25, 2026 Java

Custom Metrics with Micrometer — Counters, Gauges, and Distribution Summaries

How to instrument a Spring Boot service with custom Micrometer metrics — publishing counters for events, gauges for current state, timers for latency, and distribution summaries for arbitrary measurements.

Java Spring Boot Observability

Feb 24, 2026 Architecture

Strangler Fig — Migrating a Monolith to Microservices Incrementally in Java

How to apply the strangler fig pattern to incrementally migrate a Java monolith — routing traffic, extracting bounded contexts, and keeping the system running throughout the migration.

Java Spring Boot Architecture

Feb 23, 2026 Betfair

Steam Moves — Detecting Rapid Price Change as a Trading Signal in Java

How to detect steam moves in Betfair pre-race markets — rapid, sustained price shortening driven by informed money — and how to build a Java signal that distinguishes steam from noise.

Java Betfair Trading

Feb 22, 2026 Spring Boot

OAuth2 Resource Server — Validating JWTs with Spring Security

How to configure a Spring Boot service as an OAuth2 resource server that validates JWTs from an identity provider — covering JWKS validation, custom claims extraction, and method-level security.

Java Spring Boot Security

Feb 21, 2026 AWS

Blue/Green Deployments on ECS Fargate with CodeDeploy and CDK

How to configure blue/green deployments for an ECS Fargate service using CodeDeploy and AWS CDK — shift traffic gradually, run validation hooks, and roll back automatically on failure.

Java AWS DevOps

Feb 20, 2026 Java

Efficient Pagination — Offset vs Keyset with Spring Data

Why offset pagination degrades at scale and how to implement keyset pagination in Spring Data JPA — covering the trade-offs, the query pattern, and how to expose it cleanly through a REST API.

Java Spring Boot Database

Feb 19, 2026 Betfair

Each-Way Betting — Place Markets, Price Structure, and API Differences in Java

How each-way betting works on Betfair Exchange, how place markets differ from win markets in the API, how to identify them programmatically, and what this means for price analysis.

Java Betfair Trading

Feb 18, 2026 Architecture

Domain Events — Decoupling Aggregates Without a Message Broker

How to model and publish domain events within a Spring Boot application using the application event bus — decoupling aggregates without Kafka, with a clear path to async messaging later.

Java Spring Boot Architecture

Feb 17, 2026 Spring Boot

Distributed Cron Jobs with ShedLock and Spring Scheduling

How to prevent duplicate execution of scheduled tasks across multiple Spring Boot instances using ShedLock — covering setup, lock providers, lock duration tuning, and observability.

Java Spring Boot Architecture

Feb 16, 2026 Testing

Property-Based Testing in Java with jqwik

How to write property-based tests in Java with jqwik — generating hundreds of inputs automatically, expressing invariants rather than examples, and finding the edge cases you didn't think to write.

Java Testing

Feb 15, 2026 Betfair

Market Status in the Streaming API — Handling ACTIVE, SUSPENDED, and CLOSED States

How market status transitions are signalled in the Betfair Streaming API, what each status means for your order book and positions, and how to implement correct state machine handling in Java.

Java Betfair Trading

Feb 14, 2026 AWS

Java Lambda Cold Start Reduction — GraalVM Native Image and SnapStart

How to reduce Java Lambda cold start times using GraalVM Native Image and Lambda SnapStart — what each approach costs, what it gains, and when to use which.

Java AWS Performance

Feb 13, 2026 Spring Boot

Building a Custom Auto-Configuration for Shared Libraries

How to write a Spring Boot auto-configuration that activates based on conditions — covering @ConditionalOnClass, @ConditionalOnProperty, spring.factories, and the AutoConfiguration.imports pattern.

Java Spring Boot Architecture

Feb 12, 2026 Java

CompletableFuture Composition — thenCompose, thenCombine, and allOf in Practice

How to compose async operations with CompletableFuture — chaining with thenCompose, combining results with thenCombine, waiting for all with allOf, and handling errors without blocking.

Java Concurrency Functional Programming

Feb 11, 2026 Architecture

Resilience Patterns — Circuit Breaker, Bulkhead, and Timeout in Distributed Systems

The circuit breaker, bulkhead, and timeout resilience patterns — what problem each solves, how they interact, and when to apply them in a distributed Java service.

Java Architecture Resilience

Feb 10, 2026 Betfair

Working with BSP and Starting Prices in the Betfair Exchange API

How BSP (Betfair Starting Price) works, how to retrieve SP and BSP prices from the API, how to place BSP bets, and how to use pre-race SP estimates in a trading strategy.

Java Betfair Trading

Feb 9, 2026 Spring Boot

HikariCP Connection Pool Tuning for Production

How to configure HikariCP in Spring Boot for production workloads — pool sizing, timeout settings, health checks, leak detection, and the common misconfigurations that cause connection exhaustion.

Java Spring Boot Database

Feb 8, 2026 Java

Stream Collectors Deep Dive — groupingBy, partitioningBy, and Custom Collectors

A practical guide to the most useful Java Stream collectors beyond toList — covering groupingBy, partitioningBy, counting, summarising, joining, and how to write a custom collector.

Java Functional Programming

Feb 7, 2026 Betfair

Weight of Money — Computing WoM from the Full Price Ladder in Java

How to compute Weight of Money from the full Betfair Exchange price ladder, why naive WoM is misleading, and how to build a robust signal that accounts for large orders and market depth.

Java Betfair Trading

Feb 6, 2026 Kafka

Exactly-Once Semantics — What It Actually Means in Practice

What Kafka's exactly-once semantics actually guarantee, how idempotent producers and transactions work under the hood, how to configure them in Spring Boot, and when the cost is worth paying.

Java Spring Boot Apache Kafka

Feb 5, 2026 Architecture

Hexagonal Architecture — Structuring a Spring Boot Service with Ports and Adapters

How to structure a Spring Boot service using hexagonal architecture — defining ports as interfaces, writing adapters for HTTP and persistence, and keeping the domain completely framework-free.

Java Spring Boot Architecture

Feb 4, 2026 AWS

S3 File Upload and Download from Spring Boot

How to upload, download, and manage files in AWS S3 from a Spring Boot service using the AWS SDK v2 — covering multipart uploads, presigned URLs, and IAM access patterns.

Java Spring Boot AWS

Feb 3, 2026 Java

Records as DTOs — Replacing Jackson POJOs with Java Records

How to use Java records as request and response DTOs with Jackson in Spring Boot — covering deserialisation, validation, nested records, and the cases where records don't fit.

Java Spring Boot REST

Feb 2, 2026 Spring Boot

Constructor Injection — Why the Spring Team Recommends It

Why constructor injection is preferred over field injection in Spring Boot — covering testability, immutability, required dependencies, and what @Autowired on a field actually costs you.

Java Spring Boot Architecture

Feb 1, 2026 Betfair

Connecting to the Exchange Streaming API — Subscriptions and Message Flow in Java

How to connect to the Betfair Exchange Streaming API from Java, construct market and order subscriptions, and handle the initial image before processing delta updates.

Java Betfair Trading

Jan 29, 2026 Spring Boot

The Transactional Outbox Pattern with Kafka and MongoDB

How to guarantee at-least-once event delivery from a Spring Boot service to Kafka — implementing the Transactional Outbox Pattern with MongoDB, a polling publisher, and an idempotent consumer.

Java Spring Boot Apache Kafka

Jan 23, 2026 Java

Profiling Production JVMs with JFR and JMC

How to use Java Flight Recorder and Java Mission Control to profile production JVMs — recording CPU, memory, GC, and thread behaviour without significant overhead, interpreting flame graphs, and diagnosing real performance problems.

Java Performance Observability

Jan 8, 2026 Spring Boot

Spring Data JPA Projections — Interface and DTO Projections Without Boilerplate

How to use Spring Data JPA projections to retrieve partial data — interface projections, class-based DTO projections, and dynamic projections — without manual mapping or loading unused columns.

Java Spring Boot Database

Jan 7, 2026 Java

Virtual Threads in Java 21 — What Project Loom Changes for Server-Side Java

How virtual threads work in Java 21, what they change for I/O-bound server applications, how to enable them in Spring Boot, and where the remaining limitations are.

Java Concurrency Java 21

Jan 6, 2026 Betfair

Exchange Order Types — Limit, LimitOnClose, and MarketOnClose Explained

The three Betfair Exchange order types — Limit, LimitOnClose, and MarketOnClose — what each one does, when to use each, and how to construct them correctly in a Java API client.

Java Betfair Trading

Jan 5, 2026 Architecture

CQRS — Separating Commands from Queries in a Spring Boot Service

How to implement CQRS in a Spring Boot service — the command and query separation, write and read model design, why the split pays off under load, and when CQRS is the wrong choice.

Java Spring Boot Architecture

Jan 4, 2026 AWS

AWS CDK in Java — Writing Infrastructure as Code with Constructs and Stacks

How to write AWS infrastructure as Java code using CDK — constructs, stacks, the three levels of abstraction, environment-specific configuration, and the CDK synth/deploy workflow.

Java AWS DevOps

Jan 3, 2026 Spring Boot

Spring Boot 3 Migration Guide — What Changed from 2.x and How to Upgrade

The key breaking changes in Spring Boot 3 — Jakarta namespace, Java 17 baseline, Actuator changes, Spring Security updates — and a practical migration path from Spring Boot 2.x.

Java Spring Boot DevOps

Jan 2, 2026 Java

Sealed Interfaces — Modelling Finite State Hierarchies in Java 17+

How sealed interfaces and classes in Java 17 enable exhaustive pattern matching, replace string constants and enums for complex state hierarchies, and make invalid states unrepresentable.

Java Architecture

Jan 1, 2026 Betfair

Introduction to the Betfair Exchange API — Architecture, Endpoints, and Getting Started in Java

An overview of the Betfair Exchange API — what it offers, how the REST and Streaming APIs compare, how to get credentials, and what a first Java integration looks like.

Java Betfair Trading

Dec 21, 2025 Architecture

Object-Oriented vs Functional Programming (And Why the Argument Is Wrong)

Object-Oriented vs Functional Programming in Java — a senior developer's take after 20 years building production systems. Polymorphism, immutability, and why combining both produces the best Java code.

Architecture Object-Oriented Programming Functional Programming

Dec 20, 2025 Architecture

Hexagonal vs Clean Architecture in Spring Boot

Hexagonal vs Clean Architecture in Java Spring Boot — a practical comparison from a senior developer who has applied both in production across event-driven, microservices, and government-scale systems.

Architecture Hexagonal Architecture Clean Architecture

Dec 15, 2025 Architecture

Hexagonal Architecture for Real-World Systems

How I use Hexagonal Architecture (Ports and Adapters) in Java Spring Boot systems — from Betfair trading frameworks to DWP Digital's benefit platform. Practical patterns for keeping domain logic clean and independently testable.

Architecture Hexagonal Architecture Clean Code

Oct 7, 2025 Spring Boot

Adding Robustness with Spring Retry Annotations

How to use Spring Retry @Retryable and @Backoff in Spring Boot to handle transient failures cleanly — configurable retry logic with exponential backoff, selective exception handling, and real-world examples from Java integration services.

Spring Boot Retryable Backoff

Oct 3, 2025 Java

Java Memory Management and GC Tuning for Low-Latency Systems

JVM memory management and GC tuning for Java low-latency systems — G1GC vs ZGC, key JVM flags, allocation pressure reduction, and GC monitoring with JFR for Betfair trading and financial data pipelines.

Java JVM GC

Sep 26, 2025 Smarkets

Smarkets API Integration for Java Developers

Integrating with the Smarkets Exchange API in Java — REST and streaming authentication, market browsing, order placement, and building a multi-exchange abstraction alongside Betfair.

Java Smarkets Betting Exchange

Sep 19, 2025 Spring Boot

Production Observability with Actuator, Micrometer, and Prometheus

Building production-grade observability into Spring Boot — Actuator health endpoints, custom health indicators, Micrometer metrics, Prometheus export, and instrumenting business-level metrics.

Java Spring Boot Observability

Sep 12, 2025 Betfair

Pre-Race vs In-Play Trading — Technical Architecture

The technical and strategic differences between pre-race and in-play Betfair trading — market state transitions, streaming API indicators, latency requirements, and Java architecture for both modes.

Java Betfair Trading

Sep 5, 2025 AWS

AWS Lambda with Spring Boot — Cold Start Optimisation

Deploying Spring Boot to AWS Lambda and tackling cold start latency — GraalVM native image, SnapStart, tiered compilation, and knowing when Lambda is the wrong choice for Java workloads.

Java AWS Lambda

Aug 29, 2025 Java

Structured Concurrency in Java 21

Structured concurrency in Java 21 — StructuredTaskScope, ShutdownOnFailure, ShutdownOnSuccess, how it prevents thread leaks, and where it produces cleaner code than CompletableFuture.

Java Java 21 Structured Concurrency

Aug 22, 2025 Betdaq

Betdaq API Integration for Java Developers

A practical guide to integrating with the Betdaq Exchange API in Java — authentication, market browsing, placing orders, and building an abstraction layer for multi-exchange trading systems.

Java Betdaq Betting Exchange

Aug 15, 2025 Java

Event Sourcing with Spring Boot and MongoDB

Implementing event sourcing in Java Spring Boot with MongoDB as the event store — event appending, aggregate reconstruction, snapshots, and publishing events to Kafka for downstream projections.

Java Spring Boot Event Sourcing

Aug 8, 2025 Betfair

Risk Management in Automated Betting Systems

Risk management architecture for automated Betfair trading in Java — stake limits, liability caps, drawdown monitoring, kill switch implementation, and graceful shutdown on API disconnection.

Java Betfair Risk Management

Aug 1, 2025 Spring Boot

Spring Data MongoDB — Modelling and Querying Documents

Using Spring Data MongoDB in Spring Boot — @Document modelling, repositories, MongoTemplate for complex queries, aggregation pipelines, indexing, and avoiding the N+1 problem.

Java Spring Boot MongoDB

Jul 25, 2025 Betfair

Placing and Managing Orders with the Betfair API in Java

How to place, update, cancel, and replace orders on Betfair in Java — covering placeOrders, cancelOrders, replaceOrders, listCurrentOrders, error handling, and reconciliation.

Java Betfair Exchange API

Jul 18, 2025 Resilience4j

Circuit Breakers, Rate Limiters, and Bulkheads in Spring Boot

Practical guide to Resilience4j in Spring Boot — configuring @CircuitBreaker, @RateLimiter, @Bulkhead, and @Retry annotations, and testing resilience patterns in integration tests.

Java Spring Boot Resilience4j

Jul 11, 2025 Java

Sealed Classes and Pattern Matching — Modern Java Features

Sealed classes and pattern matching in switch expressions (Java 17–21) — replacing instanceof chains with exhaustive pattern matching, guarded patterns, and record deconstruction.

Java Java 17 Java 21

Jul 4, 2025 Betfair

Building a Spring Boot Trading Strategy Engine

How to architect a pluggable trading strategy engine in Spring Boot for Betfair — strategy interfaces, event-driven signal evaluation, lifecycle management, and risk controls.

Java Spring Boot Betfair

Jun 27, 2025 Spring Boot

CQRS Pattern with Kafka and Spring Boot

Implementing CQRS in Spring Boot with Kafka — separating command and query models, publishing events, building read projections, and knowing when CQRS is worth the complexity.

Java Spring Boot CQRS

Jun 20, 2025 Betfair

Order Flow Imbalance — A Java Implementation

Order flow imbalance (OFI) as a trading signal on Betfair — what it is, how to calculate it from streaming data, and how to build a real-time OFI indicator in Java.

Java Betfair Trading

Jun 13, 2025 Architecture

Domain-Driven Design in Java Spring Boot

A practical DDD guide for Java Spring Boot developers — covering aggregates, value objects, domain events, bounded contexts, and how to keep JPA out of your domain model.

Java Spring Boot DDD

Jun 6, 2025 Java

CompletableFuture — Mastering Async Programming

A comprehensive guide to CompletableFuture in Java — covering thenApply, thenCompose, allOf, exception handling, custom executors, and the pitfalls to avoid in real-world async pipelines.

Java CompletableFuture Async

May 30, 2025 Betfair

Last Traded Price Dynamics — Reading Market Direction

How Last Traded Price data from the Betfair Streaming API reveals market momentum — building a sliding window LTP analyser in Java to calculate price velocity and identify drift patterns.

Java Betfair Trading

May 26, 2025 Java

Java NullPointerException Avoidance and Enhancement Tactics

Java NullPointerException avoidance — comprehensive guide to null-safe String handling, Objects utility methods, Optional, enum comparisons, and enhanced NPE messages in JDK 15+. Practical Java null-handling tactics for cleaner, safer code.

Java NullPointerException TimeUnit

May 23, 2025 Testing

Testcontainers for Spring Boot — Real Databases, Real Confidence

Why Testcontainers beats mocked repositories for integration testing, and how to use it in Spring Boot with PostgreSQL, MongoDB, and Kafka — with real container setup and test speed tips.

Java Spring Boot Testcontainers

May 22, 2025 Java

Pattern match Optional in Java 21

A clever Java 21 trick for combining Optional with pattern matching using instanceof — when it's useful, how it works, and why true Optional pattern matching support in a future Java version will make this obsolete.

Java Pattern Matching Optional

May 21, 2025 Apache HttpClient Classic APIs

A Quick Guide

Apache HttpClient Classic APIs in Java — complete guide to synchronous HTTP with POST, GET, PUT, PATCH, DELETE, HEAD, and OPTIONS. Response handlers, error handling, and full working examples tested against a REST API.

Java HttpClient Apache

May 16, 2025 Betfair

Weight of Money — Implementing WoM Calculations in Java

How to calculate Weight of Money (WoM) from live Betfair Streaming data in Java — including the formula, rolling trend signals, Spring Boot wiring, and when the signal is and isn't reliable.

Java Betfair Trading

May 9, 2025 Spring Boot

Deep Dive into Apache Kafka Consumers

A thorough guide to robust Kafka consumers in Spring Boot — covering @KafkaListener, consumer groups, manual commit, error handling, dead letter topics, and idempotent processing patterns.

Java Spring Boot Apache Kafka

May 8, 2025 Java

Formatting Code Snippets in Javadoc

How to correctly format code snippets in Javadoc — when to use <pre>, <code>, and {@code} for annotations, generics, and multi-line blocks. Practical guide to clean, renderable Javadoc for Java API documentation.

Java Javadoc Documentation

May 7, 2025 Java

Why I Avoid Checked Exceptions

Why Java checked exceptions cause more problems than they solve — and how to replace them with clean unchecked exceptions, custom RuntimeException subclasses, and Spring Boot’s @ControllerAdvice for global error handling.

Java Exceptions Clean Code

May 6, 2025 Java

Hashing for Secure and Efficient Code

Java hashing guide — MD5, SHA-256, PBKDF2, and bcrypt with MessageDigest, Apache Commons Codec, Guava, and jBCrypt. When to use each algorithm, how to avoid common mistakes, and practical examples for data integrity and password storage.

Java Hashing Security

May 5, 2025 Java, Spring Boot & AWS

Publisher-Subscriber Pattern Using SNS & SQS

Implementing the publisher-subscriber pattern in Java Spring Boot using AWS SNS and SQS — full working example with Spring Cloud AWS, decoupled microservices, and real-world event-driven architecture patterns.

Java AWS Spring Boot

May 4, 2025 Java

Records for Simpler, Cleaner Code

Java Records — a practical guide to replacing boilerplate data classes with immutable, concise records in Java 16+. Covers constructors, validation, factory methods, and when to use records vs classes vs Lombok.

Java Records Clean Code

May 3, 2025 Java

Functional Interfaces for Cleaner Code

Java Functional Interfaces deep dive — Predicate, Function, Consumer, Supplier, BiFunction, and more. Practical examples with lambdas, method references, and stream pipelines from real-world Spring Boot applications.

Java Functional Programming Lambda Expressions

May 2, 2025 Betfair

Understanding the Betfair Streaming API in Java

How the Betfair Streaming API (ESA) works and how to build a robust Java WebSocket client — covering the protocol, market change messages, local state caching, and reconnection logic.

Java Betfair Streaming API

May 1, 2025 Java

A Random Pitfall

java.util.Random is a hidden performance bottleneck in multi-threaded Java systems — here’s why, and how switching to ThreadLocalRandom eliminates CAS contention and restores throughput in high-concurrency Spring Boot applications.

Java Random Math

Apr 30, 2025 Java

Immutables - No Setters Allowed

Immutable objects in Java — why they matter for thread safety, how to build them correctly with final fields, factory methods, and validation, and why setters undermine everything. Practical examples from production Spring Boot systems.

Java Immutables Lombok

Apr 28, 2025 Clean Coding

Four Principles to Boost Your Team’s Productivity

Four clean code principles every Java developer should apply — rigorous testing, meaningful naming, Single Responsibility, and side-effect-free functions. Real examples from Spring Boot, Kafka, and microservices projects.

Software Development Clean Code Junit

Apr 27, 2025 Git

How to Undo Your Git Failure?

How to recover lost commits, undone resets, and dropped stashes in Git using git reflog and git reset. Step-by-step recovery guide for the most common Git disasters, with practical examples every Java developer will recognise.

Git Version Control Development

Apr 26, 2025 GitHub Flow

A Java Developer’s Guide to Streamlined Collaboration

GitHub Flow for Java developers — how the branch-based workflow keeps teams productive and main always deployable. Practical guide with branching strategy, pull request reviews, CI/CD integration, and real examples from Spring Boot projects.

GitHub Workflow Java

Apr 25, 2025 Java 21

Virtual Threads and Project Loom — A Practical Guide

Deep dive into Java 21 virtual threads — how they work, how to enable them in Spring Boot 3, where they shine for IO-bound workloads, and where they won't help you.

Java Java 21 Virtual Threads

Apr 18, 2025 Betfair

Getting Started with the Betfair Exchange API in Java

A practical Java guide to the Betfair Exchange API — covering SSOID authentication, the non-interactive login flow, listing markets, retrieving runner prices, and placing your first bet.

Java Betfair Betting Exchange

Mar 20, 2025 Digital Minimalism

Staying Focused in a Noisy Tech World

Five digital minimalism strategies that help senior developers stay in flow state — managing inbox noise, social media, notifications, and screen time so you have the mental bandwidth for deep technical work.

Social Media Minimalism Technology