Mica vs Other Java Libraries: Bean Copy, UUID, and Date Formatting Benchmarks

Mica (Mica)

Mica, symbolizing the core of cloud services, makes cloud service development more convenient and fast. It originated from lutool, which was incubated internally for about two years and has been used by many enterprises. Because lutool was not friendly enough to micro‑services, Mica was rebuilt, polishing most components for better usability and performance.

Mica Core Dependencies

Mica is based on Java 8, has no legacy baggage, and supports both traditional Servlet and Reactive (WebFlux). It uses mica-auto to automatically generate spring.factories and spring-devtools.properties configurations, depending only on Spring Boot and the Spring Cloud ecosystem, with no third‑party dependencies. It is a rare core component for micro‑services.

Release Notes

[1.0.1] – 2019‑04‑03

Fixed several P3C code‑check issues.

Optimized generics to avoid compilation problems in some environments.

Added WebUtil.renderJson() from lutool.

Improved DateUtil performance.

Enhanced RuntimeUtil performance.

Upgraded Gradle to 5.3.1.

This version mainly performed stress tests on several utilities.

Bean Copy Benchmark

Benchmark   Score      Error   Units
hutool      1939.092   26.747  ops/ms
spring      3569.035   39.607  ops/ms
cglib       9112.785   560.503 ops/ms
mica        17753.409  393.245 ops/ms

Conclusion: Mica delivers strong, non‑compile‑time bean copy performance.

UUID Stress Test

Benchmark                Score      Error   Units
jdk8UUId                 734.595    17.220  ops/ms
jdk8ThreadLocalRandomUUId3224.759   32.107  ops/ms
hutoolFastSimpleUUID     3619.748   67.195  ops/ms
micaUUId (Java 9 method) 12375.405  241.879 ops/ms

Conclusion: Using the Java 9 algorithm, Mica’s UUID generation performance is outstanding.

Date Format Stress Test

Benchmark      Score      Error   Units
java8Date      2405.924   44.912  ops/ms
micaDateUtil   2541.753   48.321  ops/ms
hutoolDateUtil 2775.531   13.526  ops/ms

Conclusion: Hutool benefits from the FastDateFormat of Commons‑Lang3, while Mica avoids SimpleDateFormat’s thread‑safety issues by using Tomcat 8’s ConcurrentDateFormat.