Remove use of @Nullable from copy of SortedProperties

Rationale: @Nullable is not visible in the spring-context-indexer
project.

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

@@ -30,8 +30,6 @@ import java.util.Properties;
 import java.util.Set;
 import java.util.TreeSet;
 
-import org.springframework.lang.Nullable;
-
 /**
  * Specialization of {@link Properties} that sorts properties alphanumerically
  * based on their keys.
@@ -87,7 +85,7 @@ class SortedProperties extends Properties {
 
 
 	@Override
-	public void store(OutputStream out, @Nullable String comments) throws IOException {
+	public void store(OutputStream out, String comments) throws IOException {
 		ByteArrayOutputStream baos = new ByteArrayOutputStream();
 		super.store(baos, (this.omitComments ? null : comments));
 		String contents = new String(baos.toByteArray(), StandardCharsets.ISO_8859_1);
@@ -99,7 +97,7 @@ class SortedProperties extends Properties {
 	}
 
 	@Override
-	public void store(Writer writer, @Nullable String comments) throws IOException {
+	public void store(Writer writer, String comments) throws IOException {
 		StringWriter stringWriter = new StringWriter();
 		super.store(stringWriter, (this.omitComments ? null : comments));
 		String contents = stringWriter.toString();
@@ -111,12 +109,12 @@ class SortedProperties extends Properties {
 	}
 
 	@Override
-	public void storeToXML(OutputStream out, @Nullable String comments) throws IOException {
+	public void storeToXML(OutputStream out, String comments) throws IOException {
 		super.storeToXML(out, (this.omitComments ? null : comments));
 	}
 
 	@Override
-	public void storeToXML(OutputStream out, @Nullable String comments, String encoding) throws IOException {
+	public void storeToXML(OutputStream out, String comments, String encoding) throws IOException {
 		super.storeToXML(out, (this.omitComments ? null : comments), encoding);
 	}