DATAMONGO-1092 - Ensure compatibility with MongoDB 2.8.0.rc0 and java driver 2.13.0-rc0.

We updated GroupByResults to allow working with changed data types returned for count and keys and fixed assertion on error message for duplicate keys.
Using java-driver 2.12.x when connecting to an 2.8.0.rc-0 instance is likely to cause trouble with authentication. This is the intended behavior.

2.8.0-rc0 throws error when removing elements from a collection that does not yet exist, which is different to what 2.6.x does.

The java-driver 2.13.0-rc0 works perfectly fine with a 2.6.x Server instance.
We deprecated Index.Duplicates#DROP since it has been removed in MongoDB 2.8

Original pull request: #246.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/index/Index.java

@@ -35,7 +35,17 @@ import com.mongodb.DBObject;
 public class Index implements IndexDefinition {
 
 	public enum Duplicates {
-		RETAIN, DROP
+		RETAIN, //
+
+		/**
+		 * Dropping Duplicates was removed in MongoDB Server 2.8.0-rc0.
+		 * <p>
+		 * See https://jira.mongodb.org/browse/SERVER-14710
+		 * 
+		 * @deprecated since 1.7.
+		 */
+		@Deprecated//
+		DROP
 	}
 
 	private final Map<String, Direction> fieldSpec = new LinkedHashMap<String, Direction>();

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/mapreduce/GroupByResults.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011 the original author or authors.
+ * Copyright 2011 - 2014 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -26,7 +26,8 @@ import com.mongodb.DBObject;
  * Collects the results of executing a group operation.
  * 
  * @author Mark Pollack
- * @param <T> The class in which the results are mapped onto, accessible via an interator.
+ * @author Christoph Strobl
+ * @param <T> The class in which the results are mapped onto, accessible via an {@link Iterator}.
  */
 public class GroupByResults<T> implements Iterable<T> {
 
@@ -38,6 +39,7 @@ public class GroupByResults<T> implements Iterable<T> {
 	private String serverUsed;
 
 	public GroupByResults(List<T> mappedResults, DBObject rawResults) {
+
 		Assert.notNull(mappedResults);
 		Assert.notNull(rawResults);
 		this.mappedResults = mappedResults;
@@ -68,21 +70,24 @@ public class GroupByResults<T> implements Iterable<T> {
 	}
 
 	private void parseCount() {
+
 		Object object = rawResults.get("count");
-		if (object instanceof Double) {
-			count = (Double) object;
+		if (object instanceof Number) {
+			count = ((Number) object).doubleValue();
 		}
 
 	}
 
 	private void parseKeys() {
+
 		Object object = rawResults.get("keys");
-		if (object instanceof Integer) {
-			keys = (Integer) object;
+		if (object instanceof Number) {
+			keys = ((Number) object).intValue();
 		}
 	}
 
 	private void parseServerUsed() {
+
 		// "serverUsed" : "127.0.0.1:27017"
 		Object object = rawResults.get("serverUsed");
 		if (object instanceof String) {

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/MongoTemplateTests.java

@@ -105,6 +105,8 @@ public class MongoTemplateTests {
 
 	private static final org.springframework.data.util.Version TWO_DOT_FOUR = org.springframework.data.util.Version
 			.parse("2.4");
+	private static final org.springframework.data.util.Version TWO_DOT_EIGHT = org.springframework.data.util.Version
+			.parse("2.8");
 
 	@Autowired MongoTemplate template;
 	@Autowired MongoDbFactory factory;
@@ -115,7 +117,6 @@ public class MongoTemplateTests {
 	@Rule public ExpectedException thrown = ExpectedException.none();
 
 	@Autowired
-	@SuppressWarnings("unchecked")
 	public void setMongo(Mongo mongo) throws Exception {
 
 		CustomConversions conversions = new CustomConversions(Arrays.asList(DateToDateTimeConverter.INSTANCE,
@@ -235,7 +236,7 @@ public class MongoTemplateTests {
 			template.insert(person);
 			fail("Expected DataIntegrityViolationException!");
 		} catch (DataIntegrityViolationException e) {
-			assertThat(e.getMessage(), containsString("E11000 duplicate key error index: database.person.$_id_  dup key:"));
+			assertThat(e.getMessage(), containsString("E11000 duplicate key error index: database.person.$_id_"));
 		}
 	}
 
@@ -289,8 +290,7 @@ public class MongoTemplateTests {
 			template.save(person);
 			fail("Expected DataIntegrityViolationException!");
 		} catch (DataIntegrityViolationException e) {
-			assertThat(e.getMessage(),
-					containsString("E11000 duplicate key error index: database.person.$firstName_-1  dup key:"));
+			assertThat(e.getMessage(), containsString("E11000 duplicate key error index: database.person.$firstName_-1"));
 		}
 	}
 
@@ -318,6 +318,7 @@ public class MongoTemplateTests {
 	}
 
 	@Test
+	@SuppressWarnings("deprecation")
 	public void testEnsureIndex() throws Exception {
 
 		Person p1 = new Person("Oliver");
@@ -339,19 +340,29 @@ public class MongoTemplateTests {
 			if ("age_-1".equals(ix.get("name"))) {
 				indexKey = ix.get("key").toString();
 				unique = (Boolean) ix.get("unique");
-				dropDupes = (Boolean) ix.get("dropDups");
+				if (mongoVersion.isLessThan(TWO_DOT_EIGHT)) {
+					dropDupes = (Boolean) ix.get("dropDups");
+					assertThat(dropDupes, is(true));
+				} else {
+					assertThat(ix.get("dropDups"), is(nullValue()));
+				}
 			}
 		}
 		assertThat(indexKey, is("{ \"age\" : -1}"));
 		assertThat(unique, is(true));
-		assertThat(dropDupes, is(true));
 
 		List<IndexInfo> indexInfoList = template.indexOps(Person.class).getIndexInfo();
 
 		assertThat(indexInfoList.size(), is(2));
 		IndexInfo ii = indexInfoList.get(1);
 		assertThat(ii.isUnique(), is(true));
-		assertThat(ii.isDropDuplicates(), is(true));
+
+		if (mongoVersion.isLessThan(TWO_DOT_EIGHT)) {
+			assertThat(ii.isDropDuplicates(), is(true));
+		} else {
+			assertThat(ii.isDropDuplicates(), is(false));
+		}
+
 		assertThat(ii.isSparse(), is(false));
 
 		List<IndexField> indexFields = ii.getIndexFields();
@@ -677,8 +688,8 @@ public class MongoTemplateTests {
 		Query q = new Query(Criteria.where("text").regex("^Hello.*"));
 		Message found1 = template.findAndRemove(q, Message.class);
 		Message found2 = template.findAndRemove(q, Message.class);
-		// Message notFound = template.findAndRemove(q, Message.class);
-		DBObject notFound = template.getCollection("").findAndRemove(q.getQueryObject());
+
+		Message notFound = template.findAndRemove(q, Message.class);
 		assertThat(found1, notNullValue());
 		assertThat(found2, notNullValue());
 		assertThat(notFound, nullValue());

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/mapreduce/GroupByTests.java

@@ -49,6 +49,7 @@ import com.mongodb.Mongo;
  * 
  * @author Mark Pollack
  * @author Oliver Gierke
+ * @author Christoph Strobl
  */
 @RunWith(SpringJUnit4ClassRunner.class)
 @ContextConfiguration("classpath:infrastructure.xml")
@@ -60,7 +61,6 @@ public class GroupByTests {
 	MongoTemplate mongoTemplate;
 
 	@Autowired
-	@SuppressWarnings("unchecked")
 	public void setMongo(Mongo mongo) throws Exception {
 
 		MongoMappingContext mappingContext = new MongoMappingContext();
@@ -116,7 +116,7 @@ public class GroupByTests {
 	}
 
 	@Test
-	public void SimpleGroup() {
+	public void simpleGroupFunction() {
 
 		createGroupByData();
 		GroupByResults<XObject> results = mongoTemplate.group(
@@ -128,7 +128,7 @@ public class GroupByTests {
 	}
 
 	@Test
-	public void SimpleGroupWithKeyFunction() {
+	public void simpleGroupWithKeyFunction() {
 
 		createGroupByData();
 		GroupByResults<XObject> results = mongoTemplate.group(
@@ -140,7 +140,7 @@ public class GroupByTests {
 	}
 
 	@Test
-	public void SimpleGroupWithFunctionsAsResources() {
+	public void simpleGroupWithFunctionsAsResources() {
 
 		createGroupByData();
 		GroupByResults<XObject> results = mongoTemplate.group(
@@ -152,7 +152,7 @@ public class GroupByTests {
 	}
 
 	@Test
-	public void SimpleGroupWithQueryAndFunctionsAsResources() {
+	public void simpleGroupWithQueryAndFunctionsAsResources() {
 
 		createGroupByData();
 		GroupByResults<XObject> results = mongoTemplate.group(