Last time I checked the clock, it was 11:00am and right now I have no idea because I’m in the flow state. The bug had no chance. I’m now wrapping up the report in my pull request. An Outlook popup breaks through my concentration, reminding
A while back my machine was so messed up that I could barely ssh onto it. 3,200% CPU utilization - all 32 cores on the host were fully utilized! Compare that to my last bug where it only used 1 core, 100% Fortunately, it was using Java 17 r…
I hear the misconception that a server can only accept 65K connections or a server consumes a port for each accepted connection all the time. Here is a taste of some of them: A TCP/IP address only supports 65,000 connections, so you would h…
For the last couple of months I’ve been working on a Java code navigator that fits into your browser. This won’t replace your IDE. Code discussions are handled better by github or gitlab. However, if you want to share links to your code wit…
The sirens were place a couple years ago when I received a bug report claiming that I caused 100% CPU util on a VM when it should have been idle. I was suspicious at first because I try my best to avoid patterns such as while(true) and for(…
Today I learned that Javascript does not need a StringBuilder for accumulating a large number of concatinations. As a Java programmer, that came as a shock to me. This article summarizes my exploration of this fact. A StringBuilder is grill…
My $15 Logitech M100 mouse has served me well for at least two years. It’s been so long that I can’t remember when I got it. It’s suffered so much abuse you can no longer make out the Logitech logo on the bottom. This is the second time it
Recently I stumbled up this bug where it appeared like my threads were deadlocked, but triggered a thread dump to stand out using kill -3 $(pidof java) or Ctrl+Break did not report any deadlocks. Normally when you have a dead lock you would…
Instead of throwing away something, you should try to fix it, because the root cause might be simple to fix. I recently attended AWS Summit 2019 and VMWare kindly gave away these cool Mini Cinema Lightboxes! They are great decorations for a…
Suppose you wanted to unit test java.util.Map. How would you verify each implementation? Take a quick look at the Map javadoc, and you’ll find 20 implementing classes. Each Map implementation has common unit tests for requirements that you
The book I’m going through, Programming Interviews Exposed, presents the Dining Philosophers Problem and their solution to the problem. Firstly, their explanation for their solution is weak because they do not describe the underlying princi…
Programming Interviews Exposed asks us to describe busy waiting and how to avoid it. The book provides a decent solution, but not the best solution. I’ll first introduce the problem and then build upon the solution until we have our best so…