Viktar Patotski ·
· Performance
· 10 min read One product I worked on went from 8-second page loads to 500ms and conversion doubled. Performance is a P&L line. Here's the money math and what it means for SaaS.
Viktar Patotski ·
· Performance
· 9 min read A head-to-head benchmark of the same Spring Boot app built for the JVM and as a GraalVM native binary - on real AWS hardware with a real database, run multiple times. Native wins startup, memory, and predictability; the warm JVM wins the median, peak throughput, and often the tail too - but the JVM swings run-to-run while native stays flat.
Viktar Patotski ·
· Java & Spring
· 5 min read Migrate Spring Boot 2 to 3: the javax to jakarta package rename. Why the one-line sed trick quietly breaks javax.sql and javax.crypto, which packages actually move, and how OpenRewrite does the whole upgrade safely. Tested on real apps.
Viktar Patotski ·
· Databases
· 3 min read Stop the recurring "could not acquire change log lock" error in Liquibase. Replace databasechangeloglock with Postgres session locks - auto-releases on connection drop, no manual unlock.
Viktar Patotski ·
· Command Line
· 1 min read How to find top used shell commands in Linux of macOS terminal.
Viktar Patotski ·
· Java & Spring
· 6 min read Spring can inject every implementation of an interface at once: as a List, Set, array, or a Map keyed by bean name, ordered with @Order. Copy-paste code examples.