Polish

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/docker/transport/DockerConnectionException.java

@@ -17,6 +17,7 @@
 package org.springframework.boot.buildpack.platform.docker.transport;
 
 import org.springframework.util.Assert;
+import org.springframework.util.StringUtils;
 
 /**
  * Exception thrown when connection to the Docker daemon fails.
@@ -33,11 +34,11 @@ public class DockerConnectionException extends RuntimeException {
 	}
 
 	private static String buildMessage(String host, Exception cause) {
-		Assert.notNull(host, "host must not be null");
-		Assert.notNull(cause, "cause must not be null");
+		Assert.notNull(host, "Host must not be null");
+		Assert.notNull(cause, "Cause must not be null");
 		StringBuilder message = new StringBuilder("Connection to the Docker daemon at '" + host + "' failed");
 		String causeMessage = getCauseMessage(cause);
-		if (causeMessage != null && !causeMessage.isEmpty()) {
+		if (StringUtils.hasText(causeMessage)) {
 			message.append(" with error \"").append(causeMessage).append("\"");
 		}
 		message.append("; ensure the Docker daemon is running and accessible");
@@ -48,7 +49,6 @@ public class DockerConnectionException extends RuntimeException {
 		if (cause.getCause() != null && cause.getCause().getClass().getName().equals(JNA_EXCEPTION_CLASS_NAME)) {
 			return cause.getCause().getMessage();
 		}
-
 		return cause.getMessage();
 	}
 

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/test/java/org/springframework/boot/buildpack/platform/docker/transport/DockerConnectionExceptionTests.java

@@ -35,13 +35,13 @@ class DockerConnectionExceptionTests {
 	@Test
 	void createWhenHostIsNullThrowsException() {
 		assertThatIllegalArgumentException().isThrownBy(() -> new DockerConnectionException(null, null))
-				.withMessage("host must not be null");
+				.withMessage("Host must not be null");
 	}
 
 	@Test
 	void createWhenCauseIsNullThrowsException() {
 		assertThatIllegalArgumentException().isThrownBy(() -> new DockerConnectionException(HOST, null))
-				.withMessage("cause must not be null");
+				.withMessage("Cause must not be null");
 	}
 
 	@Test

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

@@ -100,7 +100,7 @@ The builder can be specified on the command line as well, as shown in this examp
 
 [indent=0]
 ----
-$ gradle bootBuildImage --builder=mine/java-cnb-builder
+	$ gradle bootBuildImage --builder=mine/java-cnb-builder
 ----
 
 
@@ -164,5 +164,5 @@ The image name can be specified on the command line as well, as shown in this ex
 
 [indent=0]
 ----
-$ gradle bootBuildImage --imageName=example.com/library/my-app:v1
+	$ gradle bootBuildImage --imageName=example.com/library/my-app:v1
 ----