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Jason Pearson

KSP Memory Leak Dive

KSP Memory Leak Dive

An accounting of tools and techniques used to reproduce, visualize, fix and test a KSP memory leak.

VisualVM: JVM Debugging Tools

VisualVM: JVM Debugging Tools

I'm writing this series about JVM debugging tools and how I find them useful. Hopefully these explorations are helpful for other engineers that have not used these tools before. What is VisualVM? From the documentation: VisualVM is a visual tool integrating commandline JDK tools and lightweight profiling capabilities.

Why is my JDK not found on MacOS?

Why is my JDK not found on MacOS?

Whether you're working on a Kotlin Multiplatform project in XCode or trying to use VisualVM to debug a running JVM process, you may have run into an issue where your installed JDK is simply not found. It really depends on whether or not you've opted to

Softly Falls the Light of Day

There is a song that goes to the tune of taps. I learned it as a Boy Scout and every time I sing it I hear my father's voice. It has its depths and its heights. It speaks of honor, courage, and an unbreakable moral compass. These are

Testing Valhalla for IntelliJ + Android Studio

Testing Valhalla for IntelliJ + Android Studio

Save yourself some time and don't do this. Its one of those side quests that makes you run up a mountain to look at wall, there's not even a view. And you still have to walk down the mountain after. I had a Reddit conversation a

SoftRefLRUPolicyMSPerMB in JVM Builds

SoftRefLRUPolicyMSPerMB in JVM Builds

One small change that gets you a little bit of memory back.

CodeCache in JVM Builds

CodeCache in JVM Builds

Understanding how the JVM caches compiiled native code.

Kotlin JVM args: Inheritance & Defaults

Kotlin JVM args: Inheritance & Defaults

A story of verifying JVM settings and why writing clear documentation is important.

Thoughtful Code Reviews

Thoughtful Code Reviews

When you give feedback, do you think about it deeply?

Metaspace in JVM Builds

Metaspace in JVM Builds

A journey in memory outside the JVM heap into metaspace.

Designing Interviews - Scaling Startup looking for Experience

Designing Interviews - Scaling Startup looking for Experience

How do you run an candidate search and interview process for experience you don't have when you've never done it before?

Software Engineer Interview Examples

Software Engineer Interview Examples

🌲This is an evergreen post listing interviews I’ve conducted or participated in. It is not intended to be a comprehensive interview pipeline plan, but rather an enumeration of possibilities and concepts. Alignment Interview This is intended to be a casual conversation either with the hiring manager or a technical

Giving Conference Talks

Giving Conference Talks

Over the past few years, peers have increasingly asked me for advice on giving talks at conferences. I’m writing down my thoughts in hopes that others can benefit from my experience, much like I’ve learned from others before me. When I began presenting, I relied heavily on a

Android App Bundle Crashing on ResourceNotFound

Android App Bundle Crashing on ResourceNotFound

Android App Bundle has been a required format for Play Store app uploads for years now, but there is still an important gotcha that requires special handling. When a user restores a backup or sideloads an APK that was derived from the AAB format, that APK might not have the

Fixing a crash in ViewGroup offsetRectBetweenParentAndChild

Fixing a crash in ViewGroup offsetRectBetweenParentAndChild

Description I was a tracking an originally low volume bug for about 6 months that gradually worked its way into our top crashes. The stacktrace had the clue all along but I kept missing what it was pointing out. android.view.ViewGroup.offsetRectBetweenParentAndChild (ViewGroup.java:6296) android.view.ViewGroup.offsetDescendantRectToMyCoords

Android App Bundle & Google App Signing

Android App Bundle & Google App Signing

Google announced over in 2020 that all new apps will be required to upload the AAB format and gave it a hard deadline of August 2021. There were a lot of opinions at the time about the ramifications and I wanted to take the opportunity to analyze what AAB and

Android Tests

Naming things is hard in software, but when I saw a question about types of Android tests I was surprised to find several separate references to these, some of which conflict with each other. Here's my take on Android tests and how to apply generic software testing definitions to them.

Billing on Android, Goodbye AIDL

Billing on Android, Goodbye AIDL

Google released the Billing library which makes it considerably easier to handle subscriptions and consumables in Android apps. The reason it is easier to integrate is removing the need to communicate across AIDL (Android Interface Design Language), which added a lot of complexity on top of an already complex cognitive

VAMPIRE Architecture

VAMPIRE Architecture

This idea is one that has its roots starting years ago when I started building the new Hinge Android app. Since I had a clear slate I decided to start with the best ideas I could find, including what the Hinge iOS team had already adopted as its architecture. If