What’s New in Mica 2.4.5? Explore the Latest Microservice Components and Metrics

1. mica (Microservice Component Set)

mica

is a collection of microservice components designed to be plug‑and‑play, simplifying usage and reducing pitfalls. Over 40 components are available, many already integrated.

2. Version Information

Note: Starting from 2.4.5 the GA suffix was removed. The mica‑v2.0 branch only receives bug fixes, no new features.

Latest releases:

2.4.5 – mica 2.4.x, Spring Boot 2.4.x, Spring Cloud 2020

2.1.1‑GA – mica 2.0.x~2.1.x, Spring Boot 2.2.x~2.3.x, Spring Cloud Hoxton

3. Changelog

v2.4.5 – 2021‑04‑28

Added mica-jetcache (secondary cache) module.

Added mica-lite module for Spring Boot projects.

Refactored UndertowMetrics in mica-metrics to expose more useful metrics.

Improved DruidMetrics in mica-metrics.

Renamed bean redisTemplate to micaRedisTemplate in mica-redis to avoid conflicts.

Adjusted cache handling in mica-captcha to prevent null references.

Optimized bean names and added generateBase64Vo method in mica-captcha.

Reduced reflection logs in mica-logging and added links to Alibaba Cloud and Tencent Cloud logging services.

Added base64 image method in mica-qrcode.

Added generic gateway code in mica-core.

Added CollectionUtil.computeIfAbsent to avoid JDK‑8 bug JDK‑8161372.

Changed default BLOCK_SIZE to 16 in Pkcs7Encoder for broader language compatibility.

Fixed multi‑cache‑name error in mica-caffeine.

Upgraded Spring Boot to 2.4.5.

Upgraded mica-weixin to 2.1.0, improving support for mica-caffeine.

4. mica‑metrics

mica‑metrics addresses the lack of monitoring metrics for Druid and Undertow, providing the first open‑source solution and planning upstream contributions.

4.1 Druid metrics

Before mica 2.4.5 only three JDBC‑related Druid metrics were available. The update adds ten new Druid metrics and multi‑datasource support.

4.2 Undertow metrics

Undertow metrics were completely refactored in mica 2.4.5, now collecting data for xwork, session, and connector, supporting 22 metrics.

5. mica ecosystem

mica-auto – Spring Boot starter: https://gitee.com/596392912/mica-auto

mica-weixin – JFinal Weixin Spring Boot starter: https://gitee.com/596392912/mica-weixin

mica-mqtt – MQTT component based on t‑io: https://gitee.com/596392912/mica-mqtt

Spring Cloud microservice HTTP/2 solution (h2c): https://gitee.com/596392912/spring-cloud-java11

mica-security – Permission system (Vue migration in progress): https://gitee.com/596392912/mica-security