Polish contribution

See gh-22383

spring-context-indexer/src/main/java/org/springframework/context/index/processor/PropertiesMarshaller.java

@@ -28,6 +28,7 @@ import java.util.Set;
  * Marshaller to write {@link CandidateComponentsMetadata} as properties.
  *
  * @author Stephane Nicoll
+ * @author Vedran Pavic
  * @since 5.0
  */
 abstract class PropertiesMarshaller {
@@ -35,7 +36,7 @@ abstract class PropertiesMarshaller {
 	public static void write(CandidateComponentsMetadata metadata, OutputStream out) throws IOException {
 		Properties props = new SortedProperties(true);
 		metadata.getItems().forEach(m -> props.put(m.getType(), String.join(",", m.getStereotypes())));
-		props.store(out, "");
+		props.store(out, null);
 	}
 
 	public static CandidateComponentsMetadata read(InputStream in) throws IOException {

spring-context-indexer/src/main/java/org/springframework/context/index/processor/SortedProperties.java

@@ -93,7 +93,7 @@ class SortedProperties extends Properties {
 		super.store(baos, (this.omitComments ? null : comments));
 		String contents = new String(baos.toByteArray(), StandardCharsets.ISO_8859_1);
 		for (String line : contents.split(EOL)) {
-			if (!this.omitComments || !line.startsWith("#")) {
+			if (!(this.omitComments && line.startsWith("#"))) {
 				out.write((line + EOL).getBytes(StandardCharsets.ISO_8859_1));
 			}
 		}
@@ -105,7 +105,7 @@ class SortedProperties extends Properties {
 		super.store(stringWriter, (this.omitComments ? null : comments));
 		String contents = stringWriter.toString();
 		for (String line : contents.split(EOL)) {
-			if (!this.omitComments || !line.startsWith("#")) {
+			if (!(this.omitComments && line.startsWith("#"))) {
 				writer.write(line + EOL);
 			}
 		}

spring-context-indexer/src/test/java/org/springframework/context/index/processor/PropertiesMarshallerTests.java

@@ -27,7 +27,6 @@ import org.junit.Test;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
-
 /**
  * Tests for {@link PropertiesMarshaller}.
  *