Fix same toString representation for different page instances. Closes spring-projects#2066

Author: manousos

src/main/java/org/springframework/data/domain/PageImpl.java

@@ -26,6 +26,7 @@
  * @param <T> the type of which the page consists.
  * @author Oliver Gierke
  * @author Mark Paluch
+ * @author Manousos Mathioudakis
  */
 public class PageImpl<T> extends Chunk<T> implements Page<T> {
 
@@ -120,7 +121,8 @@ public String toString() {
 			contentType = content.get(0).getClass().getName();
 		}
 
-		return String.format("Page %s of %d containing %s instances", getNumber() + 1, getTotalPages(), contentType);
+		return String.format("Page %s of %d containing %s instances @%s",
+				getNumber() + 1, getTotalPages(), contentType, Integer.toHexString(hashCode()));
 	}
 
 	/*

src/test/java/org/springframework/data/domain/PageImplUnitTests.java

@@ -29,6 +29,7 @@
  *
  * @author Oliver Gierke
  * @author Mark Paluch
+ * @author Manousos Mathioudakis
  */
 class PageImplUnitTests {
 
@@ -191,7 +192,16 @@ void toStringShouldNotInspectNullInstances() {
 
 		Page<Integer> page = new PageImpl<>(Collections.singletonList(null));
 
-		assertThat(page).hasToString("Page 1 of 1 containing UNKNOWN instances");
+		assertThat(page).hasToString(String.format("Page 1 of 1 containing UNKNOWN instances @%s", Integer.toHexString(page.hashCode())));
 	}
 
+	@Test //issue 2066
+	void toStringShouldNotBeEqualsForDifferentPages() {
+		Page<String> page1 = new PageImpl<>(Arrays.asList("item1", "item2"), PageRequest.of(0, 5), 10);
+		Page<String> page2 = new PageImpl<>(Arrays.asList("item1", "item3"), PageRequest.of(0, 5), 10);
+
+		assertThat(page1.toString()).isNotEqualTo(page2.toString());
+	}
+
+
 }