Entries

Notes on Installing VMware Tanzu RabbitMQ 4.3 RPM Package on Rocky Linux 9

This article explains how to install VMware Tanzu RabbitMQ 4.3 on Rocky Linux 9 and configure a 3-node cluster.

Making JSpecify/NullAway Easier for Maven Users with the Nullability Maven Plugin

This article introduces how to introduce JSpecify and NullAway in Maven and simplify the configuration using the Nullability Maven Plugin.

How to Access the Spring Enterprise Repository

This article explains how Tanzu Spring purchasers can configure their Maven repositories and obtain access tokens for Spring Enterprise. It also notes that versions no longer supported in the OSS release are available.

Notes on Creating GIF Animations from MOV Files Using ffmpeg

This article introduces basic ffmpeg commands and examples for converting video speed.

Notes on Installing VMware Tanzu for Postgres 18.2 on Rocky Linux with Patroni HA Configuration

This article shows how to install VMware Tanzu for Postgres 18.2 on Rocky Linux 9 running on OrbStack using a Patroni HA setup, covering Etcd and HAProxy configuration and failover verification.

Notes on Installing and Setting Up Gitea Act Runner as a Service on Ubuntu

This article introduces the steps to install Gitea Act Runner on Ubuntu and configure it as a systemd service.

Instrumenting JDBC Operations in Spring Boot Applications with Datasource Micrometer

This article introduces how to instrument JDBC operations in Spring Boot using Datasource Micrometer and visualize SQL logs, traces, and metrics in Grafana.

Using Spring Security 7’s MFA support to perform two‑factor authentication (2FA) with TOTP

This article shows how to implement TOTP 2FA as a custom Factor in Spring Security 7’s MFA and walks through the steps for a sample application.

Trying a Hello World Job with Spring Batch 6 / Spring Boot 4, where the DB is no longer required by default

In Spring Batch 6 / Spring Boot 4, a database is no longer required by default. This article shows how to create a Hello World job and run it with a GraalVM native image.

Sending Spring Boot Application Logs with Logback + OpenTelemetry (OTLP)

In this article, we introduce how to send logs from Spring Boot via OTLP using the alpha version of opentelemetry‑logback‑appender and a custom Auto‑Configuration, presenting a configuration procedure and implementation example that does not require a logback‑spring.xml.

Notes on Deploying RustFS to Fly.io

In this article, we show how to deploy the S3‑compatible storage RustFS to Fly.io within the free tier, covering configuration steps and how to use the console and the aws CLI.

Trying Spring gRPC 1.0

In this article, we will introduce the steps to create a HelloWorld server and client using Spring gRPC, and also implement testing, observability, reactor, and native images.

Tutorial for Creating Private AI Apps with Spring AI and gpt-oss

In this article we build a Spring AI app with Ollama’s gpt‑oss, covering chat, memory, vector store, RAG and an immigration advisor.

Abstracting Java System Time Creation with InstantSource to Improve Testability

In this article we explain Java's InstantSource vs Clock, how to inject it for testable time handling, and DB‑based time tricks.

Notes on Troubleshooting Java Container Images Created with Paketo Buildpack

Note on Pre‑reading Rows with MyBatis Cursor

Prepared llms.txt for LLMs

Notes on Installing Keycloak with Helm

Notes on Installing Tanzu Greenplum on Kubernetes 1.0

Note on Accessing MongoDB-compatible DocumentDB with Spring Boot + Testcontainers