DATACMNS-1304 - PropertyPath now supports properties with all uppercase endings.

Backport of the changes applied to Lovelace and Kay.

Original pull request: #289.

src/main/java/org/springframework/data/mapping/PropertyPath.java

@@ -15,6 +15,7 @@
  */
 package org.springframework.data.mapping;
 
+import java.beans.Introspector;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Iterator;
@@ -72,7 +73,7 @@ public class PropertyPath implements Iterable<PropertyPath> {
 		Assert.notNull(owningType, "Owning type must not be null!");
 		Assert.notNull(base, "Perviously found properties must not be null!");
 
-		String propertyName = name.matches(ALL_UPPERCASE) ? name : StringUtils.uncapitalize(name);
+		String propertyName = Introspector.decapitalize(name);
 		TypeInformation<?> propertyType = owningType.getProperty(propertyName);
 
 		if (propertyType == null) {
@@ -356,7 +357,7 @@ public class PropertyPath implements Iterable<PropertyPath> {
 			exception = e;
 		}
 
-		Pattern pattern = Pattern.compile("\\p{Lu}+\\p{Ll}*$");
+		Pattern pattern = Pattern.compile("\\p{Lu}\\p{Ll}*$");
 		Matcher matcher = pattern.matcher(source);
 
 		if (matcher.find() && matcher.start() != 0) {

src/test/java/org/springframework/data/mapping/PropertyPathUnitTests.java

@@ -364,6 +364,21 @@ public class PropertyPathUnitTests {
 		PropertyPath.from(path, Left.class);
 	}
 
+	@Test // DATACMNS-1304
+	public void resolvesPropertyPathWithSingleUppercaseLetterPropertyEnding() {
+		assertThat(from("categoryB", Product.class).toDotPath(), is("categoryB"));
+	}
+
+	@Test // DATACMNS-1304
+	public void resolvesPropertyPathWithUppercaseLettersPropertyEnding() {
+		assertThat(from("categoryABId", Product.class).toDotPath(), is("categoryAB.id"));
+	}
+
+	@Test // DATACMNS-1304
+	public void detectsNestedSingleCharacterProperty() {
+		assertThat(from("category_B", Product.class).toDotPath(), is("category.b"));
+	}
+
 	private class Foo {
 
 		String userName;
@@ -407,4 +422,18 @@ public class PropertyPathUnitTests {
 	private class Right {
 		Left bar;
 	}
+
+	// DATACMNS-1304
+	private class Product {
+		Category category;
+		Category categoryB;
+		Category categoryAB;
+	}
+
+	private class Category {
+		B b;
+		String id;
+	}
+
+	private class B {}
 }