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Archives

May 2021

How to Prevent Certain Exceptions from Tripping a Resilience4j Circuit

Using Redis as a Distributed Lock with Lettuce

An Introduction to Redis Streams via Lettuce

How to Retry API Requests in Java using Resilience4j

How to Test Latency with a Mock Server in Java

Configuring, Testing, and Using Circuit Breakers on Rest API calls with Resilience4j

April 2021

Working with String Types in Redis using Lettuce and Webflux

Bootstrap a Local Sharded Redis Cluster in Five Minutes

Using Hashtags in Clustered Redis with Lettuce and Webflux

Configuring Lettuce/Webflux to work with Clustered Redis

Working with Lists in Redis using Lettuce and Webflux

A Guide to Operating on Multiple Sets in Redis with Lettuce

How to Publish and Subscribe to Redis Using Lettuce

Setup and Use a DynamoDB Test Container with the AWS Java SDK 2.0

Breaking down Lettuce MSET Commands in Clustered Redis

A Guide to Simple Set Operations in Redis with Lettuce

Lettuce, MSETNX, and Clustered Redis

A Guide to Operating on Sorted Sets in Redis with Lettuce

Working with Redis Hashes using Lettuce And Webflux

Expiring Individual Elements in a Redis Set

Pre Loading a Lua Script into Redis With Lettuce

Subscribing to Redis Channels with Java, Spring Boot, and Lettuce

Redis Transactions, Reactive Lettuce: Buyer Beware

Optimistic Locking in Redis with Reactive Lettuce

How to Run a Lua Script against Redis using Lettuce

Why Redis Pub/Sub is not SQS, and Vice Versa

Subscribing to Channels in Clustered Redis With Lettuce

Pre Loading Lua Scripts into Clustered Redis with Lettuce

How to Prevent DEBUG Logging by Test Containers when Running Unit Tests in Java

March 2021

Making Sense of Mono Error Handling in Spring Boot Webflux/Project Reactor

How to Configure Lettuce to use Redis Read Replicas in Spring Boot Webflux

How to use a Redis Test Container with Lettuce/Spring Boot Webflux

How to Zip Reactor Mono Objects that Return Void

Set up a Basic Leader/Follower Redis Cluster Locally using Docker

How to use Caffeine Caches Effectively in Spring Boot Webflux

How to Unit Test that a Reactor Mono was Actually Subscribed to

How to use Embedded Redis to Test a Lettuce Client in Spring Boot Webflux

Atomic Incrementing in DynamoDB with the Java AWS SDK 2.0

How to Configure Lettuce to connect to a local Redis Instance with Webflux

February 2021

Basic Python Lambda Function Uploads using the AWS CLI

Setting up a Python Lambda to Trigger on DynamoDB Streams via the AWS CLI

November 2020

Publishing to SNS in Java with the AWS SDK 2.0

Working with Nested Attributes, DynamoDB, and the Java SDK 2.0

Query a DynamoDB Global Secondary Index in Java

Scanning a DynamoDB table in Java with the AWS SDK 2.0

DynamoDB and Duplicate Keys in Global Secondary Indexes

DynamoDB Transactions and Java

October 2020

Set Time to Live [TTL] on DynamoDB Items using Java

Optimistic Locking in Java and DynamoDB

Querying DynamoDB in Java with the AWS SDK 2.0

In-Memory Caching in Sprint Boot Webflux/Project Reactor

Query a DynamoDB Local Secondary Index with Java

Configuring an In Memory DynamoDB instance with Java for Integration Testing

How to Automatically Retry on a Webclient Timeout in Spring Boot Webflux

September 2020

How to Make Sequential API Calls and Merge the Results In Spring Boot Webflux

How to Have a Fallback on Errors Calling Downstream Services in Spring Boot Webflux

How to Make Parallel API calls in Spring Boot Webflux

How to Setup a Reactive SQS Listener Using the AWS SDK and Spring Boot

Continuous Subscriptions in Reactor

How to Send SQS Messages to Localstack with the AWS Java SDK 2.0

August 2020

A Guide to Automatic Retries in Reactor

OpenAPI and Spring Boot Webflux: A Working Introduction

How to use Mock Server to End to End Test Any WebClient Calls in Spring Boot Webflux

How to Setup SNS Message Forwarding to SQS with the AWS CLI

How to use Optimistic Locking in DynamoDB via the AWS CLI

How to Mock Dependencies and Unit Test in Spring Boot Webflux

July 2020

How to Forward Request Headers to Downstream Services in Spring Boot Webflux

DynamoDB Basics: A Hands On Tutorial

DynamoDB and Spring Boot Webflux - A Working Introduction

How to Return a Response Entity in Spring Boot Webflux

Optimistic Locking in MySQL--Explain Like I'm Five

DynamoDB Streams and Python: A Working Introduction

June 2020

How to Configure Rest Assured to Record the Latency of Every Request In a Custom Way

The Hystrix Parameters You Actually Need to Tune in Spring Boot

How to Setup and Use Kubernetes in Docker [kind]

An Example Upgrade and Rollback of a Deployment image in Kubernetes

May 2020

How to Create a Digital Ocean Droplet using Terraform

How To Create a Kubernetes Cluster on Digital Ocean using Terraform

A Concise Guide to Using Jasypt In Spring Boot for Configuration Encryption

How to Map Multiple Headers to the Same Variable in Nginx

How to Configure Prometheus to Scrape and Aggregate Data From a Spring Boot 2.x Application

How to Expose Meaningful Prometheus Metrics In a Spring Boot 2.x Application

July 2019

How to Configure Reactive Netty in Spring Boot, in Depth

The Difference Between a Reactive Non-Blocking Model and Classic Asynchronous Code

June 2019

How to Create Multiple Digital Ocean Droplets and Provision Them Using Ansible

How To Create a Digital Ocean Droplet and Provision It Using Ansible

How to Make Concurrent Service API Calls in Java Using Spring Boot

May 2019

How to Run a Script on Cluster State Change Using Consul Watch

How to Register a Spring Boot Service to a Consul Cluster

How to Selectively Allow Cross Origin Resource Sharing in Spring Boot

A Fast SCSS Learning Feedback Loop With Harp and BrowserSync

April 2019

How to Provision a Consul Client-Server Cluster using Ansible

How to Migrate An Embedded PostgreSQL Database Using Flyway in Spring Boot

How to Migrate a Real PostgreSQL Database Using Flyway with Spring Boot

How to Use Nginx's Caching to Improve Site Responsiveness

How to Deploy a Spring MVC Application Behind an Nginx Reverse Proxy

How to Provision a Standalone Consul Server with Ansible

How To Invalidate an Nginx Cache In a Reverse Proxy Setup With Spring MVC

How to Create an Embedded PostgreSQL Database With Spring Boot

March 2019

How to Provision a Linux VM With Kibana Using Ansible

How to do Test Driven Development on Your Ansible Roles Using Molecule

How To Upgrade Kibana using Ansible

How to do a Rolling Upgrade of Multiple Logstash Instances Using Ansible

How to do a Rolling Upgrade of an Elasticsearch Cluster Using Ansible

How to Provision a Multi Node Elasticsearch Cluster Using Ansible

How to Provision Multiple Logstash Hosts Using Ansible

February 2019

Exploring Lombok: How to use @Builder, @Accessors, and @Wither for POJO Classes

How to run a SQL Script Against a Postgres Database Using Ansible

December 2018

Antifragile, by Nassim Nicholas Taleb: Summary In Quotes

Next, by Michael Lewis: Summary In Quotes

Java Date and Time: Instant, LocalDate, and TemporalAdjuster

Behind The Cloud: Summary In Quotes

November 2018

How to Set Up a Local Unsecured Postgres Virtual Machine (for testing)

Java IO: Creating and Traversing Files And Directories

Java IO: Zip Archive Manipulation

Improving Java IO Performance: Appropriately Using Random Access Over Streams

Java IO: Paths and Files

Java IO: Input Streaming

How to Use Spring's Aspect Oriented Programming to log all Public Methods

A VagrantFile for Elasticsearch, Logstash, and Kibana (On Three Different Servers)

How to Dynamically Deserialize JSON In Java With Jackson

Improving Java IO Performance: Caching Data, When Appropriate

Improving Java IO Performance: Does Compression Actually Help?

Improving Java IO Performance: Reducing Method Call Overhead

Improving Java IO Performance: Buffering Techniques

How to Benchmark Java Code Using JUnit and JMH

A Simple Zero Downtime Continuous Integration Pipeline for Spring MVC

Use First Class Functions to Reduce Code Duplication In Java

How to Run Integration Tests with Setup and Teardown Code in Maven Build

How to Use Spring's Dependency Injection in Setup And Teardown Code For Integration Tests With Maven

Improving Java IO Performance: Formatting Costs

How to Provision a Server with Java using Ansible

October 2018

The Java Stream API: Primitive Streams

The Java Stream API: Collecting Downstream Elements

The Java Stream API: An Introduction to Collecting Results

The Java Stream API--Introduction: Filter, Map, and Count

The New New Thing, A Silicon Valley Story: Summary in Quotes

Never Split the Difference by Chris Voss: Summary In Quotes

How to Simulate Distributed Systems in the Cloud with Vagrant

The Java Stream API: Collecting Into Maps

The Java Stream API: How to Work With Optional Types

The Java Stream API: Concatenating, Sorting, and Flat-Mapping

The Java Stream API: Creating Custom, Lazy, Infinite Streams

The Everything Store, Jeff Bezos and the Age of Amazon: Summary In Quotes

Skin In The Game by Nassim Nicholas Taleb: Summary In Quotes

How to Set Up A Private Local Network On Your PC With VirtualBox

The Java Stream API: Generating Fibonacci Numbers

The Java Stream API: Parallel Streams

The Java Stream API: Reduction Operations

The Java Stream API: Creating Optional Types

How to Provision a Linux Server With Any Version of Java via a Bash Script

August 2018

How to Configure Visual Studio to Implement the Yarn Package Manager

How To Make a Basic Working Contact Form With ASP .NET Core MVC and MailKit

How to Set Up ClickOnce Continuous Deployment for WPF via Nginx