Merge branch '4.0.x'

Closes gh-48651

buildpack/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/io/InspectedContent.java

@@ -141,7 +141,7 @@ public class InspectedContent implements Content {
 
 		private @Nullable File tempFile;
 
-		private final byte[] singleByteBuffer = new byte[0];
+		private final byte[] singleByteBuffer = new byte[1];
 
 		private InspectingOutputStream(Inspector[] inspectors) {
 			this.inspectors = inspectors;

buildpack/spring-boot-buildpack-platform/src/test/java/org/springframework/boot/buildpack/platform/io/InspectedContentTests.java

@@ -93,6 +93,17 @@ class InspectedContentTests {
 					0xa3, 0xbf, 0x4f, 0x1b, 0x2b, 0x0b, 0x82, 0x2c, 0xd1, 0x5d, 0x6c, 0x15, 0xb0, 0xf0, 0x0a, 0x08);
 	}
 
+	@Test
+	void ofWritingSingleBytesShouldWork() throws Exception {
+		InspectedContent content = InspectedContent.of((outputStream) -> {
+			outputStream.write('A');
+			outputStream.write('B');
+			outputStream.write('C');
+		});
+		assertThat(content.size()).isEqualTo(3);
+		assertThat(readBytes(content)).containsExactly('A', 'B', 'C');
+	}
+
 	private byte[] readBytes(InspectedContent content) throws IOException {
 		ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
 		content.writeTo(outputStream);