Upgrade to Spring Boot 4.0.0-M3

On the heels of the Spring Boot 4 upgrade, this commit upgrade to the
latest milestone and align the errorprone and NullAway versions.

See gh-2016

README.md

@@ -13,7 +13,8 @@ See the presentation here:
 
 ## Run Petclinic locally
 
-Spring Petclinic is a [Spring Boot](https://spring.io/guides/gs/spring-boot) application built using [Maven](https://spring.io/guides/gs/maven/) or [Gradle](https://spring.io/guides/gs/gradle/). You can build a JAR file and run it from the command line (it should work just as well with Java 17 or newer):
+Spring Petclinic is a [Spring Boot](https://spring.io/guides/gs/spring-boot) application built using [Maven](https://spring.io/guides/gs/maven/) or [Gradle](https://spring.io/guides/gs/gradle/).
+Java 24 or later is required for the build, but the application can run with Java 17 or newer:
 
 ```bash
 git clone https://github.com/spring-projects/spring-petclinic.git
@@ -97,7 +98,7 @@ There is a `petclinic.css` in `src/main/resources/static/resources/css`. It was
 
 The following items should be installed in your system:
 
-- Java 17 or newer (full JDK, not a JRE)
+- Java 24 or newer (full JDK, not a JRE)
 - [Git command line tool](https://help.github.com/articles/set-up-git)
 - Your preferred IDE
   - Eclipse with the m2e plugin. Note: when m2e is available, there is an m2 icon in `Help -> About` dialog. If m2e is

build.gradle

@@ -1,7 +1,7 @@
 plugins {
   id 'java'
   id 'checkstyle'
-  id 'org.springframework.boot' version '3.5.0'
+  id 'org.springframework.boot' version '4.0.0-M3'
   id 'io.spring.dependency-management' version '1.1.7'
   id 'org.graalvm.buildtools.native' version '0.11.1'
   id 'org.cyclonedx.bom' version '3.0.0'
@@ -30,8 +30,8 @@ ext.springJavaformatCheckstyleVersion = "0.0.47"
 ext.webjarsLocatorLiteVersion = "1.1.1"
 ext.webjarsFontawesomeVersion = "4.7.0"
 ext.webjarsBootstrapVersion = "5.3.8"
-ext.errorProneVersion = "2.41.0"
-ext.nullAwayVersion = "0.12.9"
+ext.errorProneVersion = "2.42.0"
+ext.nullAwayVersion = "0.12.10"
 
 dependencies {
   implementation 'org.springframework.boot:spring-boot-starter-cache'

pom.xml

@@ -5,7 +5,7 @@
   <parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
-    <version>4.0.0-M2</version>
+    <version>4.0.0-M3</version>
     <relativePath></relativePath>
   </parent>
 
@@ -31,15 +31,14 @@
     <webjars-font-awesome.version>4.7.0</webjars-font-awesome.version>
 
     <checkstyle.version>11.1.0</checkstyle.version>
+    <error-prone.version>2.42.0</error-prone.version>
     <jacoco.version>0.8.13</jacoco.version>
     <libsass.version>0.3.4</libsass.version>
     <lifecycle-mapping>1.0.0</lifecycle-mapping>
     <maven-checkstyle.version>3.6.0</maven-checkstyle.version>
     <nohttp-checkstyle.version>0.0.11</nohttp-checkstyle.version>
+    <nullaway.version>0.12.10</nullaway.version>
     <spring-format.version>0.0.47</spring-format.version>
-
-    <error-prone.version>2.41.0</error-prone.version>
-    <nullaway.version>0.12.9</nullaway.version>
   </properties>
 
   <dependencies>
@@ -72,7 +71,8 @@
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-test</artifactId>
       <scope>test</scope>
-    </dependency>    <dependency>
+    </dependency>
+    <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-restclient</artifactId>
       <scope>test</scope>