Author Archives: ronaldpringadi

Apache Kafka vs RabbitMQ for Messaging in Java (and Where ActiveMQ Fits In)

Posted on August 9, 2022 by ronaldpringadi

If you’re standing in front of a whiteboard in Java land and someone has just drawn a box labelled “message queue,” you’re probably going to argue about Apache Kafka and RabbitMQ for the next forty minutes. They’ve become the default … Continue reading →

Posted in java | Tagged activemq, Java, kafka, messaging, microservices, rabbitmq | Comments Off

Java Web Servers Compared: Tomcat, JBoss EAP, WildFly, and Spring Boot

Posted on April 12, 2022 by ronaldpringadi

If you’ve been writing Java for the web at any point in the last two decades, you’ve had to pick a web server or application server at least once. The choices haven’t changed much in name — Tomcat, JBoss, WildFly, … Continue reading →

Posted in java | Tagged Java, jboss, microservices, spring boot, tomcat, wildfly | Comments Off

Starting a Spring Boot API Microservice From Scratch With Spring Initializr

Posted on September 15, 2021 by ronaldpringadi

The fastest way to get a new Java microservice off the ground is also the most boring one, and that’s a compliment. You go to start.spring.io, click a few checkboxes, download a zip, and you have a runnable Hypertext Transfer … Continue reading →

Posted in java | Tagged Java, microservices, spring boot, swagger | Comments Off

Why Ember.js Still Makes Sense for Big Teams Building Big Apps

Posted on September 14, 2020 by ronaldpringadi

In a JavaScript world dominated by React’s flexibility and Vue’s friendliness, Ember.js can feel like the quiet older sibling who keeps showing up to work in a suit. It’s opinionated, batteries-included, and unapologetically convention-driven. Which is exactly why some of … Continue reading →

Posted in javascript | Tagged ember, frontend, microservices | Comments Off

List open or listening ports

Posted on March 29, 2019 by ronaldpringadi

You started a service, you can’t tell whether it actually bound to its port, and you want to see what’s listening — or you want to find out which process is squatting on port 8080. Two one-liners, two operating systems: … Continue reading →

Posted in Bash, Operating System | Comments Off

MongoDB Notes

Posted on March 29, 2019 by ronaldpringadi

If you’re storing binary files inside MongoDB, the convention is called GridFS. It splits each logical file into two collections: a metadata document and a sequence of binary chunks. This post is a cheat sheet for inspecting and tweaking those … Continue reading →

Posted in Database | Comments Off

CentOS 6 repo Settings

Posted on March 2, 2018 by ronaldpringadi

To fix repo settings in CentOS 6 1. make sure there is no proxy or funny settings in vi /etc/yum.conf 2. There are a couple of files within /etc/yum.repos.d/. Make sure the url are correct (accessible) and enabled=1 ll /etc/yum.repos.d/ … Continue reading →

Posted in Linux | Comments Off

Show Linux Partition Tree Mountpoint and If SSD

Posted on June 27, 2017 by ronaldpringadi

1lsblk -o TYPE,NAME,KNAME,UUID,MOUNTPOINT,SIZE,ROTA

Posted in Linux | Comments Off

Setting log4j log level programmatically

Posted on June 8, 2017 by ronaldpringadi

Sometimes you don’t want to ship a log4j.properties file — you want to spin up logging in code. Useful inside unit tests, one-off debug runs, or anywhere you want to flip log levels at runtime. Here’s a self-contained setupLog4j() that … Continue reading →

Posted in java | Comments Off

Print java stack trace from anywhere

Posted on May 26, 2017 by ronaldpringadi

Need to know which code calls a specific location? Dump the stack trace: 1234import org.apache.commons.lang3.exception.ExceptionUtils; // …somewhere in your method: LOG.trace(ExceptionUtils.getStackTrace(new Throwable())); You’re constructing a Throwable just to capture the current stack — you’re not throwing it. ExceptionUtils.getStackTrace turns the … Continue reading →