Spring Boot 2.0.0 M6 Release Notes

Stéphane Nicoll edited this page Feb 14, 2018 · 14 revisions

For changes in earlier milestones, please refer to:

Upgrading from Spring Boot 2.0.0 M5

See instructions in the 2.0.0.M5 release notes for upgrading from v2.0.0.M5 and earlier.

Actuator configuration changes

Management Server-related properties have been moved from management.* to management.server.*. We also fixed the meaning of management.server.context-path: it is now the endpoint management equivalent of server.context-path (only active when management.server.port is set). Additionally, you can also set the base path for the management endpoints with a new, separate property: management.endpoints.web.base-path.

For example, if you’ve set management.server.context-path=/management and management.endpoints.web.base-path=/application, you’ll be able to reach the health endpoint at the following path: /management/application/health.

Configuration location

The behavior of the spring.config.location configuration has been fixed; it previously added a location to the list of default ones, now it replaces the default locations. If you were relying on the way it was handled previously, you should now use spring.config.additional-location instead.

WARN message for implicit open-in-view

From now on, applications that don’t explicitly enable spring.jpa.open-in-view will get a WARN message during startup. While this behavior is a friendly default, this can lead to issues if you’re not fully aware of what’s that doing for you. This message makes sure that you understand that database queries may be performed during view rendering. If you’re fine with that, you can configure explicitly this property and never get that WARN message again.

Harmonized mainClassName in Gradle builds

BootRun, BootJar, and BootWar all use mainClassName as the property to configure the name of the main class. This makes the three Boot-specific tasks consistent with each other, and also aligns them with Gradle’s own application plugin.

ConfigurationProperties validation

It is now mandatory that your @ConfigurationProperties object is annotated with @Validated if you want to turn on validation.

DataSource Initialization

DataSource initialization is now only enabled for embedded data sources and will switch off as soon as you’re using a production database. The new spring.datasource.initialization-mode (replacing spring.datasource.initialize) offers more control.

Spring Mobile

Auto-configuration and dependency management for Spring Mobile has been removed.

New and Noteworthy

Check the configuration changelog for a complete overview of the changes in configuration.

Error conventions support in Spring WebFlux

Spring Boot now supports the same error conventions with WebFlux as it does with MVC: default views and JSON responses for errors, custom error views, and more…​ Check out the dedicated section in the reference documentation.

TLS configuration and HTTP/2 support

You can now configure SSL for your WebFlux application with server.ssl.* configuration properties. This is supported for all available servers: Tomcat, Jetty, Undertow and Reactor Netty.

You can now configure HTTP/2 for your MVC or WebFlux application: using server.http2.enabled. For this milestone, only Tomcat and Undertow are supported (see #10902 for Jetty support).

Depending on your choice of server and JDK, restrictions and prerequisites can apply.

Configurable JPA mapping resources

If you were extending Spring Boot’s JPA configuration to register mapping resources, there is now a spring.jpa.mapping-resources property.

@SendTo support with @KafkaListener

Kafka listeners using the auto-configured factory now supports @SendTo.

Data Sources Metrics

By default, all available data sources are instrumented (the mix, max and usage metrics are made available for each).

Kotlin extension

Spring Boot now ships a Kotlin runApplication extension:

package com.example.demo

import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.boot.runApplication

class DemoApplication

fun main(args: Array<String>) {
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