Use Locale.ROOT when lower-casing camel-case parts in ParsingUtils

src/main/java/org/springframework/data/util/ParsingUtils.java

@@ -18,6 +18,7 @@
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.Locale;
 import java.util.regex.Pattern;
 
 import org.springframework.util.Assert;
@@ -27,6 +28,7 @@
  * Utility methods for {@link String} parsing.
  *
  * @author Oliver Gierke
+ * @author Sharang Gupta
  * @since 1.5
  */
 public abstract class ParsingUtils {
@@ -84,7 +86,9 @@ private static List<String> split(String source, boolean toLower) {
 		List<String> result = new ArrayList<>(parts.length);
 
 		for (String part : parts) {
-			result.add(toLower ? part.toLowerCase() : part);
+			// Locale.ROOT: the parts become identifiers (table, column and field names) and must not follow the default
+			// locale, under which e.g. "Item" would become "ıtem" (dotless i) for tr-TR.
+			result.add(toLower ? part.toLowerCase(Locale.ROOT) : part);
 		}
 
 		return Collections.unmodifiableList(result);

src/test/java/org/springframework/data/util/ParsingUtilsUnitTests.java

@@ -17,12 +17,15 @@
 
 import static org.assertj.core.api.Assertions.*;
 
+import java.util.Locale;
+
 import org.junit.jupiter.api.Test;
 
 /**
  * Unit tests for {@link ParsingUtils}.
  *
  * @author Oliver Gierke
+ * @author Sharang Gupta
  */
 public class ParsingUtilsUnitTests {
 
@@ -50,4 +53,18 @@ public void splitsCamelCaseWithAllSortsOfCharacters() {
 	public void reconcatenatesCamelCaseString() {
 		assertThat(ParsingUtils.reconcatenateCamelCase("myCamelCase", "-")).isEqualTo("my-camel-case");
 	}
+
+	@Test
+	public void lowercasesPartsRegardlessOfDefaultLocale() {
+
+		var defaultLocale = Locale.getDefault();
+		Locale.setDefault(Locale.forLanguageTag("tr-TR"));
+
+		try {
+			assertThat(ParsingUtils.reconcatenateCamelCase("InvoiceItem", "_")).isEqualTo("invoice_item");
+			assertThat(ParsingUtils.splitCamelCaseToLower("invoiceId")).containsExactly("invoice", "id");
+		} finally {
+			Locale.setDefault(defaultLocale);
+		}
+	}
 }