Java developer

Everyday helpers for Java and Spring developers: turn JSON into classes, convert application properties, test regular expressions and date patterns, escape strings, decode stack traces and work out which Kafka partition a key lands on. Everything runs in your browser, so stack traces and payloads stay private.

Where it is used: Used while building and debugging Spring and JVM services: turning tables and JSON into classes, reading stack traces and thread dumps, sizing memory and pools.

Java developer on BackendBench: Spring config doctor (application.yml: renames, secrets, actuator, pools); Maven POM doctor (vulnerable, outdated and snapshot dependencies); Thread dump analyzer (deadlocks, blocked threads, pools); DDL to JPA entity (create table to @entity classes); BigDecimal rounding explorer (all roundingmodes, exact doubles); Maven ⇄ Gradle (convert dependency blocks both ways); JVM memory calculator (heap vs non-heap for containers); String.format tester (try printf specifiers and see the output); Oracle format to Java (to_char models to java patterns); JDBC URL builder (postgres, mysql, oracle and more); Spring property ⇄ env var (relaxed binding, bulk to docker or k8s); Spring Boot Dockerfile (layered multi-stage, non-root); HikariCP pool size (size the pool from db limits and load); JSON to Java (pojos, lombok or records); Stack trace beautifier (strip framework noise, find your failing code); Kafka partition calculator (key to partition, skew and repartition impact); Properties ⇄ YAML (spring application config converter); Regex tester (test, then copy as a java string); Java string escape (escape, unescape and text blocks); DateTimeFormatter tester (preview java date patterns live); ISO-8601 duration (pt15m to seconds and back). Each one is free, needs no sign-up and runs entirely in your browser, so nothing you enter is uploaded.

Generate classes (2)Debug and size the runtime (5)Build and configuration (7)Strings, numbers and dates (7)