Update CNB buildpack Java version env variable

Prior to this commit, the build tool plugins set the environment
variable BP_JAVA_VERSION when invoking the CNB builder to set the
version of the JDK/JRE that the builder should use in the created
image.

With CNB API 0.3, the convention changed the name of this environment
variable to BP_JVM_VERSION. This commit updates the build tool
plugins to match the newer convention.

See gh-21273

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/docs/asciidoc/packaging-oci-image.adoc

@@ -102,7 +102,7 @@ This configuration will use a builder image with the name `mine/java-cnb-builder
 ==== Builder Configuration
 If the builder exposes configuration options, those can be set using the `environment` property.
 
-The following example assumes that the default builder defines a `BP_JAVA_VERSION` property (typically used to customize the JDK version the image should use):
+The following example assumes that the default builder defines a `BP_JVM_VERSION` property (typically used to customize the JDK version the image should use):
 
 [source,groovy,indent=0,subs="verbatim,attributes",role="primary"]
 .Groovy

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/docs/gradle/packaging/boot-build-image-env.gradle

@@ -9,6 +9,6 @@ bootJar {
 
 // tag::env[]
 bootBuildImage {
-	environment = ["BP_JAVA_VERSION" : "13.0.1"]
+	environment = ["BP_JVM_VERSION" : "13.0.1"]
 }
 // end::env[]

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/docs/gradle/packaging/boot-build-image-env.gradle.kts

@@ -11,6 +11,6 @@ tasks.getByName<BootJar>("bootJar") {
 
 // tag::env[]
 tasks.getByName<BootBuildImage>("bootBuildImage") {
-	environment = ["BP_JAVA_VERSION" : "13.0.1"]
+	environment = ["BP_JVM_VERSION" : "13.0.1"]
 }
 // end::env[]

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/tasks/bundling/BootBuildImage.java

@@ -51,7 +51,7 @@ import org.springframework.util.StringUtils;
  */
 public class BootBuildImage extends DefaultTask {
 
-	private static final String OPENJDK_BUILDPACK_JAVA_VERSION_KEY = "BP_JAVA_VERSION";
+	private static final String BUILDPACK_JVM_VERSION_KEY = "BP_JVM_VERSION";
 
 	private RegularFileProperty jar;
 
@@ -246,8 +246,8 @@ public class BootBuildImage extends DefaultTask {
 		if (this.environment != null && !this.environment.isEmpty()) {
 			request = request.withEnv(this.environment);
 		}
-		if (this.targetJavaVersion.isPresent() && !request.getEnv().containsKey(OPENJDK_BUILDPACK_JAVA_VERSION_KEY)) {
-			request = request.withEnv(OPENJDK_BUILDPACK_JAVA_VERSION_KEY, translateTargetJavaVersion());
+		if (this.targetJavaVersion.isPresent() && !request.getEnv().containsKey(BUILDPACK_JVM_VERSION_KEY)) {
+			request = request.withEnv(BUILDPACK_JVM_VERSION_KEY, translateTargetJavaVersion());
 		}
 		return request;
 	}

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/tasks/bundling/BootBuildImageTests.java

@@ -131,15 +131,15 @@ class BootBuildImageTests {
 
 	@Test
 	void whenJavaVersionIsSetInEnvironmentItIsIncludedInTheRequest() {
-		this.buildImage.environment("BP_JAVA_VERSION", "from-env");
+		this.buildImage.environment("BP_JVM_VERSION", "from-env");
 		this.buildImage.getTargetJavaVersion().set(JavaVersion.VERSION_1_8);
-		assertThat(this.buildImage.createRequest().getEnv()).containsEntry("BP_JAVA_VERSION", "from-env").hasSize(1);
+		assertThat(this.buildImage.createRequest().getEnv()).containsEntry("BP_JVM_VERSION", "from-env").hasSize(1);
 	}
 
 	@Test
 	void whenTargetCompatibilityIsSetThenJavaVersionIsIncludedInTheRequest() {
 		this.buildImage.getTargetJavaVersion().set(JavaVersion.VERSION_1_8);
-		assertThat(this.buildImage.createRequest().getEnv()).containsEntry("BP_JAVA_VERSION", "8.*").hasSize(1);
+		assertThat(this.buildImage.createRequest().getEnv()).containsEntry("BP_JVM_VERSION", "8.*").hasSize(1);
 	}
 
 	@Test
@@ -147,7 +147,7 @@ class BootBuildImageTests {
 		this.buildImage.environment("ALPHA", "a");
 		this.buildImage.getTargetJavaVersion().set(JavaVersion.VERSION_11);
 		assertThat(this.buildImage.createRequest().getEnv()).containsEntry("ALPHA", "a")
-				.containsEntry("BP_JAVA_VERSION", "11.*").hasSize(2);
+				.containsEntry("BP_JVM_VERSION", "11.*").hasSize(2);
 	}
 
 	@Test

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/tasks/bundling/BootBuildImageIntegrationTests-failsWithBuilderError.gradle

@@ -7,5 +7,5 @@ sourceCompatibility = '1.8'
 targetCompatibility = '1.8'
 
  bootBuildImage {
-	 environment = ["BP_JAVA_VERSION" : "13.9.9"]
+	 environment = ["BP_JVM_VERSION" : "13.9.9"]
  }

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/docs/asciidoc/packaging-oci-image.adoc

@@ -146,7 +146,7 @@ The builder can be specified on the command line as well, as shown in this examp
 ==== Builder Configuration
 If the builder exposes configuration options using environment variables, those can be set using the `env` attributes.
 
-The following example assumes that the default builder defines a `BP_JAVA_VERSION` property (typically used to customize the JDK version the image should use):
+The following example assumes that the default builder defines a `BP_JVM_VERSION` property (typically used to customize the JDK version the image should use):
 
 [source,xml,indent=0,subs="verbatim,attributes"]
 ----
@@ -160,7 +160,7 @@ The following example assumes that the default builder defines a `BP_JAVA_VERSIO
 					<configuration>
 						<image>
 							<env>
-								<BP_JAVA_VERSION>13.0.1</BP_JAVA_VERSION>
+								<BP_JVM_VERSION>13.0.1</BP_JVM_VERSION>
 							</env>
 						</image>
 					</configuration>

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/intTest/projects/build-image-builder-error/pom.xml

@@ -24,7 +24,7 @@
 						<configuration>
 							<image>
 								<env>
-									<BP_JAVA_VERSION>13.9.9</BP_JAVA_VERSION>
+									<BP_JVM_VERSION>13.9.9</BP_JVM_VERSION>
 								</env>
 							</image>
 						</configuration>

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/BuildImageMojo.java

@@ -63,7 +63,7 @@ import org.springframework.util.StringUtils;
 @Execute(phase = LifecyclePhase.PACKAGE)
 public class BuildImageMojo extends AbstractPackagerMojo {
 
-	private static final String OPENJDK_BUILDPACK_JAVA_VERSION_KEY = "BP_JAVA_VERSION";
+	private static final String BUILDPACK_JVM_VERSION_KEY = "BP_JVM_VERSION";
 
 	/**
 	 * Directory containing the JAR.
@@ -175,11 +175,11 @@ public class BuildImageMojo extends AbstractPackagerMojo {
 	}
 
 	private BuildRequest customizeEnvironment(BuildRequest request) {
-		if (!request.getEnv().containsKey(OPENJDK_BUILDPACK_JAVA_VERSION_KEY)) {
+		if (!request.getEnv().containsKey(BUILDPACK_JVM_VERSION_KEY)) {
 			JavaCompilerPluginConfiguration compilerConfiguration = new JavaCompilerPluginConfiguration(this.project);
 			String targetJavaVersion = compilerConfiguration.getTargetMajorVersion();
 			if (StringUtils.hasText(targetJavaVersion)) {
-				return request.withEnv(OPENJDK_BUILDPACK_JAVA_VERSION_KEY, targetJavaVersion + ".*");
+				return request.withEnv(BUILDPACK_JVM_VERSION_KEY, targetJavaVersion + ".*");
 			}
 		}
 		return request;