Add missing hints for Querydsl integration.

This commit adds missing reflection configuration for Querydsl integration. We now also make sure to call the queryMixing getter instead of reading the field via reflection.

Closes #4244
Original pull request: #4245

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/aot/MongoRuntimeHints.java

@@ -31,6 +31,8 @@ import org.springframework.data.mongodb.core.mapping.event.ReactiveAfterConvertC
 import org.springframework.data.mongodb.core.mapping.event.ReactiveAfterSaveCallback;
 import org.springframework.data.mongodb.core.mapping.event.ReactiveBeforeConvertCallback;
 import org.springframework.data.mongodb.core.mapping.event.ReactiveBeforeSaveCallback;
+import org.springframework.data.mongodb.repository.support.QuerydslMongoPredicateExecutor;
+import org.springframework.data.mongodb.repository.support.ReactiveQuerydslMongoPredicateExecutor;
 import org.springframework.lang.Nullable;
 import org.springframework.util.ClassUtils;
 
@@ -62,13 +64,15 @@ class MongoRuntimeHints implements RuntimeHintsRegistrar {
 							TypeReference.of(ReactiveAfterSaveCallback.class)),
 							builder -> builder.withMembers(MemberCategory.INVOKE_DECLARED_CONSTRUCTORS,
 									MemberCategory.INVOKE_PUBLIC_METHODS));
-
 		}
+
+		registerQuerydslHints(hints, classLoader);
 	}
 
 	private static void registerTransactionProxyHints(RuntimeHints hints, @Nullable ClassLoader classLoader) {
 
-		if (MongoAotPredicates.isSyncClientPresent(classLoader) && ClassUtils.isPresent("org.springframework.aop.SpringProxy", classLoader)) {
+		if (MongoAotPredicates.isSyncClientPresent(classLoader)
+				&& ClassUtils.isPresent("org.springframework.aop.SpringProxy", classLoader)) {
 
 			hints.proxies().registerJdkProxy(TypeReference.of("com.mongodb.client.MongoDatabase"),
 					TypeReference.of("org.springframework.aop.SpringProxy"),
@@ -78,4 +82,28 @@ class MongoRuntimeHints implements RuntimeHintsRegistrar {
 					TypeReference.of("org.springframework.core.DecoratingProxy"));
 		}
 	}
+
+	/**
+	 * Register hints for Querydsl integration.
+	 *
+	 * @param hints must not be {@literal null}.
+	 * @param classLoader can be {@literal null}.
+	 * @since 4.0.1
+	 */
+	private static void registerQuerydslHints(RuntimeHints hints, @Nullable ClassLoader classLoader) {
+
+		if (ClassUtils.isPresent("com.querydsl.core.types.Predicate", classLoader)) {
+
+			if (isReactorPresent()) {
+				hints.reflection().registerType(ReactiveQuerydslMongoPredicateExecutor.class,
+						MemberCategory.INVOKE_PUBLIC_METHODS, MemberCategory.INVOKE_DECLARED_CONSTRUCTORS);
+
+			}
+
+			if (MongoAotPredicates.isSyncClientPresent(classLoader)) {
+				hints.reflection().registerType(QuerydslMongoPredicateExecutor.class, MemberCategory.INVOKE_PUBLIC_METHODS,
+						MemberCategory.INVOKE_DECLARED_CONSTRUCTORS);
+			}
+		}
+	}
 }

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/repository/support/SpringDataMongodbQuerySupport.java

@@ -22,8 +22,6 @@ import org.bson.codecs.DocumentCodec;
 import org.bson.json.JsonMode;
 import org.bson.json.JsonWriterSettings;
 
-import org.springframework.beans.DirectFieldAccessor;
-
 import com.mongodb.MongoClientSettings;
 import com.querydsl.core.support.QueryMixin;
 import com.querydsl.core.types.OrderSpecifier;
@@ -49,11 +47,10 @@ abstract class SpringDataMongodbQuerySupport<Q extends SpringDataMongodbQuerySup
 
 	@SuppressWarnings("unchecked")
 	SpringDataMongodbQuerySupport(MongodbDocumentSerializer serializer) {
+
 		super(serializer);
 		this.serializer = serializer;
-
-		DirectFieldAccessor fieldAccessor = new DirectFieldAccessor(this);
-		this.superQueryMixin = (QueryMixin<Q>) fieldAccessor.getPropertyValue("queryMixin");
+		this.superQueryMixin = super.getQueryMixin();
 	}
 
 	/**

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/aot/MongoRuntimeHintsUnitTests.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright 2022 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.aot;
+
+import static org.assertj.core.api.Assertions.*;
+
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.predicate.RuntimeHintsPredicates;
+import org.springframework.data.mongodb.classloading.HidingClassLoader;
+import org.springframework.data.mongodb.repository.support.QuerydslMongoPredicateExecutor;
+import org.springframework.data.mongodb.repository.support.ReactiveQuerydslMongoPredicateExecutor;
+
+import com.mongodb.client.MongoClient;
+
+/**
+ * @author Christoph Strobl
+ */
+class MongoRuntimeHintsUnitTests {
+
+	@Test // GH-4244
+	void doesNotRegisterTypesForQuerydslIntegrationWhenQuerydslNotPresent() {
+
+		RuntimeHints runtimeHints = new RuntimeHints();
+		new MongoRuntimeHints().registerHints(runtimeHints, new HidingClassLoader("com.querydsl"));
+
+		assertThat(runtimeHints)
+				.matches(RuntimeHintsPredicates.reflection().onType(QuerydslMongoPredicateExecutor.class).negate()
+						.and(RuntimeHintsPredicates.reflection().onType(ReactiveQuerydslMongoPredicateExecutor.class).negate()));
+
+	}
+
+	@Test // GH-4244
+	void registersTypesForQuerydslIntegration() {
+
+		RuntimeHints runtimeHints = new RuntimeHints();
+		new MongoRuntimeHints().registerHints(runtimeHints, null);
+
+		assertThat(runtimeHints).matches(RuntimeHintsPredicates.reflection().onType(QuerydslMongoPredicateExecutor.class)
+				.and(RuntimeHintsPredicates.reflection().onType(ReactiveQuerydslMongoPredicateExecutor.class)));
+	}
+
+	@Test // GH-4244
+	void onlyRegistersReactiveTypesForQuerydslIntegrationWhenNoSyncClientPresent() {
+
+		RuntimeHints runtimeHints = new RuntimeHints();
+		new MongoRuntimeHints().registerHints(runtimeHints, HidingClassLoader.hide(MongoClient.class));
+
+		assertThat(runtimeHints).matches(RuntimeHintsPredicates.reflection().onType(QuerydslMongoPredicateExecutor.class)
+				.negate().and(RuntimeHintsPredicates.reflection().onType(ReactiveQuerydslMongoPredicateExecutor.class)));
+	}
+
+	@Test // GH-4244
+	@Disabled("TODO: ReactiveWrappers does not support ClassLoader")
+	void doesNotRegistersReactiveTypesForQuerydslIntegrationWhenReactorNotPresent() {
+
+		RuntimeHints runtimeHints = new RuntimeHints();
+		new MongoRuntimeHints().registerHints(runtimeHints, new HidingClassLoader("reactor.core"));
+
+		assertThat(runtimeHints).matches(RuntimeHintsPredicates.reflection().onType(QuerydslMongoPredicateExecutor.class)
+				.and(RuntimeHintsPredicates.reflection().onType(ReactiveQuerydslMongoPredicateExecutor.class).negate()));
+	}
+}

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/classloading/HidingClassLoader.java

@@ -0,0 +1,105 @@
+/*
+ * Copyright 2022 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.classloading;
+
+import java.net.URLClassLoader;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.stream.Collectors;
+
+import org.springframework.instrument.classloading.ShadowingClassLoader;
+import org.springframework.util.Assert;
+
+/**
+ * is intended for testing code that depends on the presence/absence of certain classes. Classes can be:
+ * <ul>
+ * <li>shadowed: reloaded by this classloader no matter if they are loaded already by the SystemClassLoader</li>
+ * <li>hidden: not loaded by this classloader no matter if they are loaded already by the SystemClassLoader. Trying to
+ * load these classes results in a {@link ClassNotFoundException}</li>
+ * <li>all other classes get loaded by the SystemClassLoader</li>
+ * </ul>
+ *
+ * @author Jens Schauder
+ * @author Oliver Gierke
+ * @author Christoph Strobl
+ */
+public class HidingClassLoader extends ShadowingClassLoader {
+
+	private final Collection<String> hidden;
+
+	public HidingClassLoader(String... hidden) {
+		this(Arrays.asList(hidden));
+	}
+
+	public HidingClassLoader(Collection<String> hidden) {
+
+		super(URLClassLoader.getSystemClassLoader(), false);
+
+		this.hidden = hidden;
+	}
+
+	/**
+	 * Creates a new {@link HidingClassLoader} with the packages of the given classes hidden.
+	 *
+	 * @param packages must not be {@literal null}.
+	 * @return
+	 */
+	public static HidingClassLoader hide(Class<?>... packages) {
+
+		Assert.notNull(packages, "Packages must not be null");
+
+		return new HidingClassLoader(Arrays.stream(packages)//
+				.map(it -> it.getPackage().getName())//
+				.collect(Collectors.toList()));
+	}
+
+	public static HidingClassLoader hideTypes(Class<?>... types) {
+
+		Assert.notNull(types, "Types must not be null!");
+
+		return new HidingClassLoader(Arrays.stream(types)//
+				.map(it -> it.getName())//
+				.collect(Collectors.toList()));
+	}
+
+	@Override
+	public Class<?> loadClass(String name) throws ClassNotFoundException {
+
+		Class<?> loaded = super.loadClass(name);
+		checkIfHidden(loaded);
+		return loaded;
+	}
+
+	@Override
+	protected boolean isEligibleForShadowing(String className) {
+		return isExcluded(className);
+	}
+
+	@Override
+	protected Class<?> findClass(String name) throws ClassNotFoundException {
+
+		Class<?> loaded = super.findClass(name);
+		checkIfHidden(loaded);
+		return loaded;
+	}
+
+	private void checkIfHidden(Class<?> type) throws ClassNotFoundException {
+
+		if (hidden.stream().anyMatch(it -> type.getName().startsWith(it))) {
+			throw new ClassNotFoundException();
+		}
+	}
+}