Fix build on Java 16.

Make sure to use an initialized MappingContext.

Closes: #3749
Original pull request: #3752.

Author: christophstrobl

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

@@ -24,6 +24,7 @@
 import org.springframework.data.mapping.MappingException;
 import org.springframework.data.mongodb.core.mapping.MongoMappingContext;
 import org.springframework.data.mongodb.core.mapping.TimeSeries;
+import org.springframework.data.mongodb.test.util.MongoTestMappingContext;
 
 /**
  * Unit tests for {@link EntityOperations}.
@@ -32,7 +33,7 @@
  */
 class EntityOperationsUnitTests {
 
-	EntityOperations operations = new EntityOperations(new MongoMappingContext());
+	EntityOperations operations = new EntityOperations(MongoTestMappingContext.newTestContext());
 
 	@Test // GH-3731
 	void shouldReportInvalidTimeField() {

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

@@ -138,7 +138,7 @@ public class MongoTemplateTests {
 
 		cfg.configureMappingContext(it -> {
 			it.autocreateIndex(false);
-			it.intitalEntitySet(AuditablePerson.class);
+			it.initialEntitySet(AuditablePerson.class);
 
 		});
 

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/test/util/MappingContextConfigurer.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2021 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.mongodb.test.util;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+import org.springframework.lang.Nullable;
+
+/**
+ * Utility to configure {@link org.springframework.data.mongodb.core.mapping.MongoMappingContext} properties.
+ *
+ * @author Christoph Strobl
+ */
+public class MappingContextConfigurer {
+
+	private @Nullable Set<Class<?>> intitalEntitySet;
+	boolean autocreateIndex = false;
+
+	public void autocreateIndex(boolean autocreateIndex) {
+		this.autocreateIndex = autocreateIndex;
+	}
+
+	public void initialEntitySet(Set<Class<?>> initialEntitySet) {
+		this.intitalEntitySet = initialEntitySet;
+	}
+
+	public void initialEntitySet(Class<?>... initialEntitySet) {
+		this.intitalEntitySet = new HashSet<>(Arrays.asList(initialEntitySet));
+	}
+
+	Set<Class<?>> initialEntitySet() {
+		return intitalEntitySet != null ? intitalEntitySet : Collections.emptySet();
+	}
+}

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/test/util/MongoConverterConfigurer.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2021 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.mongodb.test.util;
+
+import java.util.Arrays;
+
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.data.convert.CustomConversions;
+import org.springframework.data.mongodb.core.convert.MongoCustomConversions;
+
+/**
+ * Utility to configure {@link MongoCustomConversions}.
+ *
+ * @author Christoph Strobl
+ */
+public class MongoConverterConfigurer {
+
+	CustomConversions customConversions;
+
+	public void customConversions(CustomConversions customConversions) {
+		this.customConversions = customConversions;
+	}
+
+	public void customConverters(Converter<?, ?>... converters) {
+		customConversions(new MongoCustomConversions(Arrays.asList(converters)));
+	}
+}

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/test/util/MongoTestMappingContext.java

@@ -0,0 +1,78 @@
+/*
+ * Copyright 2021 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.mongodb.test.util;
+
+import java.util.Collections;
+import java.util.function.Consumer;
+
+import org.springframework.data.mongodb.core.convert.MongoCustomConversions;
+import org.springframework.data.mongodb.core.mapping.MongoMappingContext;
+
+/**
+ * @author Christoph Strobl
+ */
+public class MongoTestMappingContext extends MongoMappingContext {
+
+	private MappingContextConfigurer contextConfigurer;
+	private MongoConverterConfigurer converterConfigurer;
+
+	public static MongoTestMappingContext newTestContext() {
+		return new MongoTestMappingContext(conig -> {}).init();
+	}
+
+	public MongoTestMappingContext(MappingContextConfigurer contextConfig) {
+
+		this.contextConfigurer = contextConfig;
+		this.converterConfigurer = new MongoConverterConfigurer();
+	}
+
+	public MongoTestMappingContext(Consumer<MappingContextConfigurer> contextConfig) {
+
+		this(new MappingContextConfigurer());
+		contextConfig.accept(contextConfigurer);
+	}
+
+	public MongoTestMappingContext customConversions(MongoConverterConfigurer converterConfig) {
+
+		this.converterConfigurer = converterConfig;
+		return this;
+	}
+
+	public MongoTestMappingContext customConversions(Consumer<MongoConverterConfigurer> converterConfig) {
+
+		converterConfig.accept(converterConfigurer);
+		return this;
+	}
+
+	public MongoTestMappingContext init() {
+
+		setInitialEntitySet(contextConfigurer.initialEntitySet());
+		setAutoIndexCreation(contextConfigurer.autocreateIndex);
+		if (converterConfigurer.customConversions != null) {
+			setSimpleTypeHolder(converterConfigurer.customConversions.getSimpleTypeHolder());
+		} else {
+			setSimpleTypeHolder(new MongoCustomConversions(Collections.emptyList()).getSimpleTypeHolder());
+		}
+
+		super.afterPropertiesSet();
+		return this;
+	}
+
+	@Override
+	public void afterPropertiesSet() {
+		init();
+	}
+}

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/test/util/MongoTestTemplate.java

@@ -50,7 +50,7 @@ public MongoTestTemplate(MongoClient client, String database, Class<?>... initia
 			cfg.configureMappingContext(it -> {
 
 				it.autocreateIndex(false);
-				it.intitalEntitySet(initialEntities);
+				it.initialEntitySet(initialEntities);
 			});
 		});
 	}

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/test/util/MongoTestTemplateConfiguration.java

@@ -16,20 +16,15 @@
 package org.springframework.data.mongodb.test.util;
 
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collections;
-import java.util.HashSet;
 import java.util.List;
-import java.util.Set;
 import java.util.function.Consumer;
 import java.util.function.Function;
 
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.ApplicationListener;
 import org.springframework.context.ConfigurableApplicationContext;
-import org.springframework.core.convert.converter.Converter;
 import org.springframework.data.auditing.IsNewAwareAuditingHandler;
-import org.springframework.data.convert.CustomConversions;
 import org.springframework.data.mapping.context.MappingContext;
 import org.springframework.data.mongodb.MongoDatabaseFactory;
 import org.springframework.data.mongodb.ReactiveMongoDatabaseFactory;
@@ -115,16 +110,7 @@ ApplicationContext getApplicationContext() {
 	MongoMappingContext mappingContext() {
 
 		if (mappingContext == null) {
-
-			mappingContext = new MongoMappingContext();
-			mappingContext.setInitialEntitySet(mappingContextConfigurer.initialEntitySet());
-			mappingContext.setAutoIndexCreation(mappingContextConfigurer.autocreateIndex);
-			if(mongoConverterConfigurer.customConversions != null) {
-				mappingContext.setSimpleTypeHolder(mongoConverterConfigurer.customConversions.getSimpleTypeHolder());
-			} else {
-				mappingContext.setSimpleTypeHolder(new MongoCustomConversions(Collections.emptyList()).getSimpleTypeHolder());
-			}
-			mappingContext.afterPropertiesSet();
+			mappingContext = new MongoTestMappingContext(mappingContextConfigurer).customConversions(mongoConverterConfigurer).init();
 		}
 
 		return mappingContext;
@@ -222,41 +208,6 @@ public void defaultDb(String defaultDatabase) {
 		}
 	}
 
-	public static class MongoConverterConfigurer {
-
-		CustomConversions customConversions;
-
-		public void customConversions(CustomConversions customConversions) {
-			this.customConversions = customConversions;
-		}
-
-		public void customConverters(Converter<?, ?>... converters) {
-			customConversions(new MongoCustomConversions(Arrays.asList(converters)));
-		}
-	}
-
-	public static class MappingContextConfigurer {
-
-		Set<Class<?>> intitalEntitySet;
-		boolean autocreateIndex = false;
-
-		public void autocreateIndex(boolean autocreateIndex) {
-			this.autocreateIndex = autocreateIndex;
-		}
-
-		public void intitalEntitySet(Set<Class<?>> intitalEntitySet) {
-			this.intitalEntitySet = intitalEntitySet;
-		}
-
-		public void intitalEntitySet(Class<?>... initialEntitySet) {
-			this.intitalEntitySet = new HashSet<>(Arrays.asList(initialEntitySet));
-		}
-
-		Set<Class<?>> initialEntitySet() {
-			return intitalEntitySet != null ? intitalEntitySet : Collections.emptySet();
-		}
-	}
-
 	public static class AuditingConfigurer {
 
 		Function<MappingContext, IsNewAwareAuditingHandler> auditingHandlerFunction;

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/test/util/ReactiveMongoTestTemplate.java

@@ -56,7 +56,7 @@ public ReactiveMongoTestTemplate(MongoClient client, String database, Class<?>..
 			cfg.configureMappingContext(it -> {
 
 				it.autocreateIndex(false);
-				it.intitalEntitySet(initialEntities);
+				it.initialEntitySet(initialEntities);
 			});
 		});
 	}