Apply nullability-plugin through ConventionsPlugin

See gh-46587

buildSrc/build.gradle

@@ -64,6 +64,7 @@ dependencies {
 	implementation("org.springframework:spring-core")
 	implementation("org.springframework:spring-web")
 	implementation("org.yaml:snakeyaml:${snakeYamlVersion}")
+	implementation("io.spring.gradle.nullability:nullability-plugin:${nullabilityPluginVersion}")
 
 	testImplementation(platform("org.junit:junit-bom:${junitJupiterVersion}"))
 	testImplementation("org.assertj:assertj-core:${assertjVersion}")

buildSrc/src/main/java/org/springframework/boot/build/JavaConventions.java

@@ -27,6 +27,7 @@ import java.util.stream.Collectors;
 import com.gradle.develocity.agent.gradle.test.DevelocityTestConfiguration;
 import com.gradle.develocity.agent.gradle.test.PredictiveTestSelectionConfiguration;
 import com.gradle.develocity.agent.gradle.test.TestRetryConfiguration;
+import io.spring.gradle.nullability.NullabilityPlugin;
 import io.spring.javaformat.gradle.SpringJavaFormatPlugin;
 import io.spring.javaformat.gradle.tasks.CheckFormat;
 import io.spring.javaformat.gradle.tasks.Format;
@@ -68,8 +69,8 @@ import org.springframework.util.StringUtils;
  * <ul>
  * <li>The project is configured with source and target compatibility of 17
  * <li>{@link SpringJavaFormatPlugin Spring Java Format}, {@link CheckstylePlugin
- * Checkstyle}, {@link TestFailuresPlugin Test Failures}, and {@link ArchitecturePlugin
- * Architecture} plugins are applied
+ * Checkstyle}, {@link TestFailuresPlugin Test Failures}, {@link ArchitecturePlugin
+ * Architecture} and {@link NullabilityPlugin} plugins are applied
  * <li>{@link Test} tasks are configured:
  * <ul>
  * <li>to use JUnit Platform
@@ -140,6 +141,7 @@ class JavaConventions {
 			configureToolchain(project);
 			configureProhibitedDependencyChecks(project);
 			configureFactoriesFilesChecks(project);
+			configureNullability(project);
 		});
 	}
 
@@ -335,4 +337,8 @@ class JavaConventions {
 			});
 	}
 
+	private void configureNullability(Project project) {
+		project.getPlugins().apply(NullabilityPlugin.class);
+	}
+
 }

gradle.properties

@@ -22,5 +22,6 @@ snakeYamlVersion=2.4
 springFrameworkVersion=7.0.0-M7
 springFramework60xVersion=6.0.23
 tomcatVersion=11.0.9
+nullabilityPluginVersion=0.0.2
 
 kotlin.stdlib.default.dependency=false