Enable AOT repositories by default

pom.xml

@@ -5,7 +5,7 @@
 
 	<groupId>org.springframework.data</groupId>
 	<artifactId>spring-data-commons</artifactId>
-	<version>4.0.0-SNAPSHOT</version>
+	<version>4.0.x-GH-3322-SNAPSHOT</version>
 
 	<name>Spring Data Core</name>
 	<description>Core Spring concepts underpinning every Spring Data module.</description>

src/main/java/org/springframework/data/aot/AotContext.java

@@ -18,12 +18,12 @@
 import java.lang.annotation.Annotation;
 import java.util.Collection;
 import java.util.List;
+import java.util.Locale;
 import java.util.Optional;
 import java.util.Set;
 import java.util.function.Consumer;
 
 import org.jspecify.annotations.Nullable;
-
 import org.springframework.beans.factory.BeanFactory;
 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
 import org.springframework.beans.factory.config.BeanDefinition;
@@ -35,6 +35,7 @@
 import org.springframework.core.env.StandardEnvironment;
 import org.springframework.data.util.TypeScanner;
 import org.springframework.util.Assert;
+import org.springframework.util.StringUtils;
 
 /**
  * The context in which the AOT processing happens. Grants access to the {@link ConfigurableListableBeanFactory
@@ -84,6 +85,37 @@ static AotContext from(BeanFactory beanFactory, Environment environment) {
 		return new DefaultAotContext(beanFactory, environment);
 	}
 
+	/**
+	 * Checks if repository code generation is enabled for a given module by checking environment variables for general
+	 * enablement ({@link #GENERATED_REPOSITORIES_ENABLED}) and store specific ones following the pattern
+	 * {@literal spring.aot.repositories.<module-name>.enabled}.
+	 * <p>
+	 * {@link #GENERATED_REPOSITORIES_ENABLED} acts as a kill switch, if disabled, store specific flags have no effect.
+	 * <p>
+	 * Missing properties are interpreted as {@literal true}.
+	 *
+	 * @param moduleName The name of the module. Can be {@literal null} or {@literal empty}, in which case it will only
+	 *          check the general {@link #GENERATED_REPOSITORIES_ENABLED} flag.
+	 * @return indicator if repository code generation is enabled.
+	 * @since 5.0
+	 */
+	default boolean isGeneratedRepositoriesEnabled(@Nullable String moduleName) {
+
+		Environment environment = getEnvironment();
+		Boolean codeGenerationEnabled = environment.getProperty(GENERATED_REPOSITORIES_ENABLED, Boolean.class, true);
+		if (!codeGenerationEnabled) {
+			return false;
+		}
+
+		if (!StringUtils.hasText(moduleName)) {
+			return true;
+		}
+
+		String modulePropertyName = GENERATED_REPOSITORIES_ENABLED.replace("enabled",
+				"%s.enabled".formatted(moduleName.toLowerCase(Locale.US)));
+		return environment.getProperty(modulePropertyName, Boolean.class, true);
+	}
+
 	/**
 	 * Returns a reference to the {@link ConfigurableListableBeanFactory} backing this {@link AotContext}.
 	 *

src/test/java/org/springframework/data/aot/AotContextUnitTests.java

@@ -0,0 +1,91 @@
+/*
+ * Copyright 2025 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.aot;
+
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+import org.mockito.Mockito;
+import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
+import org.springframework.core.env.Environment;
+import org.springframework.mock.env.MockEnvironment;
+import org.springframework.util.StringUtils;
+
+/**
+ * Tests for {@link AotContext}.
+ *
+ * @author Christoph Strobl
+ */
+class AotContextUnitTests {
+
+	@ParameterizedTest // GH-3322
+	@CsvSource({ //
+			"'spring.aot.repositories.enabled', '', '', '', true", //
+			"'spring.aot.repositories.enabled', 'true', '', '', true", //
+			"'spring.aot.repositories.enabled', 'false', '', '', false", //
+			"'spring.aot.repositories.enabled', '', 'commons', 'true', true", //
+			"'spring.aot.repositories.enabled', 'true', 'commons', 'true', true", //
+			"'spring.aot.repositories.enabled', '', 'commons', 'false', false", //
+			"'spring.aot.repositories.enabled', 'false', 'commons', 'true', false" //
+	})
+	void considersEnvironmentSettingsForGeneratedRepositories(String generalFlag, String generalValue, String storeName,
+			String storeValue, boolean enabled) {
+
+		MockAotContext ctx = new MockAotContext();
+		if (StringUtils.hasText(generalFlag) && StringUtils.hasText(generalValue)) {
+			ctx.withProperty(generalFlag, generalValue);
+		}
+		if (StringUtils.hasText(storeName) && StringUtils.hasText(storeValue)) {
+			ctx.withProperty("spring.aot.repositories.%s.enabled".formatted(storeName), storeValue);
+		}
+
+		Assertions.assertThat(ctx.isGeneratedRepositoriesEnabled(storeName)).isEqualTo(enabled);
+	}
+
+	class MockAotContext implements AotContext {
+
+		private final MockEnvironment environment;
+
+		public MockAotContext() {
+			this.environment = new MockEnvironment();
+		}
+
+		MockAotContext withProperty(String key, String value) {
+			environment.setProperty(key, value);
+			return this;
+		}
+
+		@Override
+		public ConfigurableListableBeanFactory getBeanFactory() {
+			return Mockito.mock(ConfigurableListableBeanFactory.class);
+		}
+
+		@Override
+		public TypeIntrospector introspectType(String typeName) {
+			return Mockito.mock(TypeIntrospector.class);
+		}
+
+		@Override
+		public IntrospectedBeanDefinition introspectBeanDefinition(String beanName) {
+			return Mockito.mock(IntrospectedBeanDefinition.class);
+		}
+
+		@Override
+		public Environment getEnvironment() {
+			return environment;
+		}
+	}
+}