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This article is about what has been updated by Spring Boot2.2. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Component version update

These Spring framework components update the dependent version:

Spring AMQP 2.2

Spring Batch 4.2

Spring Data Moore

Spring Framework 5.2

Spring HATEOAS 1.0

Spring Integration 5.2

Spring Kafka 2.3

Spring Security 5.2

Spring Session Corn

The third-party packages involved in the framework have also updated the dependent version:

Elasticsearch 6.7

Flyway 6.0

Jackson 2.10

JUnit 5.5

Micrometer 1.3

Reactor Dysprosium

Solr 8.0

Significant performance improvement

The performance of Spring Boot is one of the key words we often see complaining on content platforms. This time in Spring Boot 2.2, significant optimizations have been made for performance. Applications will start faster and take up less memory.

At the same time, in order to speed up the startup of the application, a global delayed initialization configuration parameter spring.main.lazy-initialization is added, which allows our application to complete the startup action faster, but it is worth noting that delayed startup also has the following side effects:

When the application is deferred initializing, the processing of the HTTP request will take longer

Errors that might have occurred during the startup period will be delayed until the startup period is running

Support for Java 13

As Spring Framework 5.2 adds support for Java 13, Spring Boot 2.2 naturally adds this feature. At the same time, Spring Boot 2.2 still supports old versions of Java 11 and Java 8 well. Therefore, users who are still using Java 8 can also feel at ease to upgrade.

Immutable @ ConfigurationProperties binding

The configuration property now supports constructor-based bindings that allow @ ConfigurationProperties annotations to decorate classes that are immutable. You can enable constructor-based binding by decorating the @ ConfigurationProperties class or one of its constructors with the @ ConstructorBinding annotation. You can use annotations such as @ DefaultValue and @ DateTimeFormat on the constructor parameters provided by the configuration property binding.

See the documentation: https://docs.spring.io/spring-boot/docs/2.2.0.RELEASE/reference/html/spring-boot-features.html#boot-features-external-config-constructor-binding for more details

RSocket support

A starter implementation of automatic configuration has been added for RSocket: spring-boot-starter-rsocket. When the project relies on spring-security-rsocket, the starter also automatically configures Spring Security's integration implementation of RSocket.

See the documentation: https://docs.spring.io/spring-boot/docs/2.2.0.RELEASE/reference/html//spring-boot-features.html#boot-features-rsocket for more details

Grouping support for health examination

Various health metrics in Spring Boot Actuator can now be grouped. If you deploy your application to Kubernetes, a typical requirement is that you may need different sets of health metrics for "liveness" and "readiness" detection. At this point, we can define different groups by configuring properties, such as: create a custom group with only the DataSource indicator:

Management.endpoint.health.group.custom.include=db

By accessing localhost8080/actuator/health/custom, you can access custom groups.

See the documentation: https://docs.spring.io/spring-boot/docs/2.2.0.RELEASE/reference/html//production-ready-features.html#health-groups for more details

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