Add nullability annotations to module/spring-boot-cache

See gh-46587

module/spring-boot-cache/src/main/java/org/springframework/boot/cache/actuate/endpoint/CachesEndpoint.java

@@ -22,6 +22,8 @@ import java.util.Map;
 import java.util.Objects;
 import java.util.function.Predicate;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.boot.actuate.endpoint.OperationResponseBody;
 import org.springframework.boot.actuate.endpoint.annotation.DeleteOperation;
 import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
@@ -30,6 +32,7 @@ import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
 import org.springframework.boot.actuate.endpoint.annotation.Selector;
 import org.springframework.cache.Cache;
 import org.springframework.cache.CacheManager;
+import org.springframework.util.Assert;
 
 /**
  * {@link Endpoint @Endpoint} to expose available {@link Cache caches}.
@@ -79,7 +82,8 @@ public class CachesEndpoint {
 	 * {@code cacheManager} was provided to identify a unique candidate
 	 */
 	@ReadOperation
-	public CacheEntryDescriptor cache(@Selector String cache, @OptionalParameter String cacheManager) {
+	public @Nullable CacheEntryDescriptor cache(@Selector String cache,
+			@OptionalParameter @Nullable String cacheManager) {
 		return extractUniqueCacheEntry(cache, getCacheEntries((name) -> name.equals(cache), isNameMatch(cacheManager)));
 	}
 
@@ -101,7 +105,7 @@ public class CachesEndpoint {
 	 * {@code cacheManager} was provided to identify a unique candidate
 	 */
 	@DeleteOperation
-	public boolean clearCache(@Selector String cache, @OptionalParameter String cacheManager) {
+	public boolean clearCache(@Selector String cache, @OptionalParameter @Nullable String cacheManager) {
 		CacheEntryDescriptor entry = extractUniqueCacheEntry(cache,
 				getCacheEntries((name) -> name.equals(cache), isNameMatch(cacheManager)));
 		return (entry != null && clearCache(entry));
@@ -118,6 +122,7 @@ public class CachesEndpoint {
 
 	private List<CacheEntryDescriptor> getCacheEntries(String cacheManagerName, Predicate<String> cacheNamePredicate) {
 		CacheManager cacheManager = this.cacheManagers.get(cacheManagerName);
+		Assert.state(cacheManager != null, "'cacheManager' must not be null");
 		return cacheManager.getCacheNames()
 			.stream()
 			.filter(cacheNamePredicate)
@@ -127,7 +132,7 @@ public class CachesEndpoint {
 			.toList();
 	}
 
-	private CacheEntryDescriptor extractUniqueCacheEntry(String cache, List<CacheEntryDescriptor> entries) {
+	private @Nullable CacheEntryDescriptor extractUniqueCacheEntry(String cache, List<CacheEntryDescriptor> entries) {
 		if (entries.size() > 1) {
 			throw new NonUniqueCacheException(cache,
 					entries.stream().map(CacheEntryDescriptor::getCacheManager).distinct().toList());
@@ -137,8 +142,10 @@ public class CachesEndpoint {
 
 	private boolean clearCache(CacheEntryDescriptor entry) {
 		String cacheName = entry.getName();
-		String cacheManager = entry.getCacheManager();
-		Cache cache = this.cacheManagers.get(cacheManager).getCache(cacheName);
+		String cacheManagerName = entry.getCacheManager();
+		CacheManager cacheManager = this.cacheManagers.get(cacheManagerName);
+		Assert.state(cacheManager != null, "'cacheManager' must not be null");
+		Cache cache = cacheManager.getCache(cacheName);
 		if (cache != null) {
 			cache.clear();
 			return true;
@@ -146,7 +153,7 @@ public class CachesEndpoint {
 		return false;
 	}
 
-	private Predicate<String> isNameMatch(String name) {
+	private Predicate<String> isNameMatch(@Nullable String name) {
 		return (name != null) ? ((requested) -> requested.equals(name)) : matchAll();
 	}
 

module/spring-boot-cache/src/main/java/org/springframework/boot/cache/actuate/endpoint/package-info.java

@@ -17,4 +17,7 @@
 /**
  * Actuator endpoint for caches.
  */
+@NullMarked
 package org.springframework.boot.cache.actuate.endpoint;
+
+import org.jspecify.annotations.NullMarked;

module/spring-boot-cache/src/main/java/org/springframework/boot/cache/autoconfigure/CacheManagerCustomizers.java

@@ -20,6 +20,8 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.boot.util.LambdaSafe;
 import org.springframework.cache.CacheManager;
 
@@ -34,7 +36,7 @@ public class CacheManagerCustomizers {
 
 	private final List<CacheManagerCustomizer<?>> customizers;
 
-	public CacheManagerCustomizers(List<? extends CacheManagerCustomizer<?>> customizers) {
+	public CacheManagerCustomizers(@Nullable List<? extends CacheManagerCustomizer<?>> customizers) {
 		this.customizers = (customizers != null) ? new ArrayList<>(customizers) : Collections.emptyList();
 	}
 

module/spring-boot-cache/src/main/java/org/springframework/boot/cache/autoconfigure/CacheProperties.java

@@ -20,6 +20,8 @@ import java.time.Duration;
 import java.util.ArrayList;
 import java.util.List;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.boot.autoconfigure.cache.CacheType;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.core.io.Resource;
@@ -39,7 +41,7 @@ public class CacheProperties {
 	/**
 	 * Cache type. By default, auto-detected according to the environment.
 	 */
-	private CacheType type;
+	private @Nullable CacheType type;
 
 	/**
 	 * List of cache names to create if supported by the underlying cache manager.
@@ -57,11 +59,11 @@ public class CacheProperties {
 
 	private final Redis redis = new Redis();
 
-	public CacheType getType() {
+	public @Nullable CacheType getType() {
 		return this.type;
 	}
 
-	public void setType(CacheType mode) {
+	public void setType(@Nullable CacheType mode) {
 		this.type = mode;
 	}
 
@@ -100,7 +102,7 @@ public class CacheProperties {
 	 * @throws IllegalArgumentException if the config attribute is set to an unknown
 	 * location
 	 */
-	public Resource resolveConfigLocation(Resource config) {
+	public @Nullable Resource resolveConfigLocation(@Nullable Resource config) {
 		if (config != null) {
 			Assert.isTrue(config.exists(),
 					() -> "'config' resource [%s] must exist".formatted(config.getDescription()));
@@ -118,13 +120,13 @@ public class CacheProperties {
 		 * The spec to use to create caches. See CaffeineSpec for more details on the spec
 		 * format.
 		 */
-		private String spec;
+		private @Nullable String spec;
 
-		public String getSpec() {
+		public @Nullable String getSpec() {
 			return this.spec;
 		}
 
-		public void setSpec(String spec) {
+		public void setSpec(@Nullable String spec) {
 			this.spec = spec;
 		}
 
@@ -139,13 +141,13 @@ public class CacheProperties {
 		 * Entry expiration. By default the entries never expire. Note that this value is
 		 * ultimately converted to seconds.
 		 */
-		private Duration expiration;
+		private @Nullable Duration expiration;
 
-		public Duration getExpiration() {
+		public @Nullable Duration getExpiration() {
 			return this.expiration;
 		}
 
-		public void setExpiration(Duration expiration) {
+		public void setExpiration(@Nullable Duration expiration) {
 			this.expiration = expiration;
 		}
 
@@ -159,13 +161,13 @@ public class CacheProperties {
 		/**
 		 * The location of the configuration file to use to initialize Infinispan.
 		 */
-		private Resource config;
+		private @Nullable Resource config;
 
-		public Resource getConfig() {
+		public @Nullable Resource getConfig() {
 			return this.config;
 		}
 
-		public void setConfig(Resource config) {
+		public void setConfig(@Nullable Resource config) {
 			this.config = config;
 		}
 
@@ -180,28 +182,28 @@ public class CacheProperties {
 		 * The location of the configuration file to use to initialize the cache manager.
 		 * The configuration file is dependent of the underlying cache implementation.
 		 */
-		private Resource config;
+		private @Nullable Resource config;
 
 		/**
 		 * Fully qualified name of the CachingProvider implementation to use to retrieve
 		 * the JSR-107 compliant cache manager. Needed only if more than one JSR-107
 		 * implementation is available on the classpath.
 		 */
-		private String provider;
+		private @Nullable String provider;
 
-		public String getProvider() {
+		public @Nullable String getProvider() {
 			return this.provider;
 		}
 
-		public void setProvider(String provider) {
+		public void setProvider(@Nullable String provider) {
 			this.provider = provider;
 		}
 
-		public Resource getConfig() {
+		public @Nullable Resource getConfig() {
 			return this.config;
 		}
 
-		public void setConfig(Resource config) {
+		public void setConfig(@Nullable Resource config) {
 			this.config = config;
 		}
 
@@ -215,7 +217,7 @@ public class CacheProperties {
 		/**
 		 * Entry expiration. By default the entries never expire.
 		 */
-		private Duration timeToLive;
+		private @Nullable Duration timeToLive;
 
 		/**
 		 * Allow caching null values.
@@ -225,7 +227,7 @@ public class CacheProperties {
 		/**
 		 * Key prefix.
 		 */
-		private String keyPrefix;
+		private @Nullable String keyPrefix;
 
 		/**
 		 * Whether to use the key prefix when writing to Redis.
@@ -237,11 +239,11 @@ public class CacheProperties {
 		 */
 		private boolean enableStatistics;
 
-		public Duration getTimeToLive() {
+		public @Nullable Duration getTimeToLive() {
 			return this.timeToLive;
 		}
 
-		public void setTimeToLive(Duration timeToLive) {
+		public void setTimeToLive(@Nullable Duration timeToLive) {
 			this.timeToLive = timeToLive;
 		}
 
@@ -253,11 +255,11 @@ public class CacheProperties {
 			this.cacheNullValues = cacheNullValues;
 		}
 
-		public String getKeyPrefix() {
+		public @Nullable String getKeyPrefix() {
 			return this.keyPrefix;
 		}
 
-		public void setKeyPrefix(String keyPrefix) {
+		public void setKeyPrefix(@Nullable String keyPrefix) {
 			this.keyPrefix = keyPrefix;
 		}
 

module/spring-boot-cache/src/main/java/org/springframework/boot/cache/autoconfigure/CaffeineCacheConfiguration.java

@@ -21,6 +21,7 @@ import java.util.List;
 import com.github.benmanes.caffeine.cache.CacheLoader;
 import com.github.benmanes.caffeine.cache.Caffeine;
 import com.github.benmanes.caffeine.cache.CaffeineSpec;
+import org.jspecify.annotations.Nullable;
 
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
@@ -65,8 +66,8 @@ class CaffeineCacheConfiguration {
 		return cacheManager;
 	}
 
-	private void setCacheBuilder(CacheProperties cacheProperties, CaffeineSpec caffeineSpec,
-			Caffeine<Object, Object> caffeine, CaffeineCacheManager cacheManager) {
+	private void setCacheBuilder(CacheProperties cacheProperties, @Nullable CaffeineSpec caffeineSpec,
+			@Nullable Caffeine<Object, Object> caffeine, CaffeineCacheManager cacheManager) {
 		String specification = cacheProperties.getCaffeine().getSpec();
 		if (StringUtils.hasText(specification)) {
 			cacheManager.setCacheSpecification(specification);

module/spring-boot-cache/src/main/java/org/springframework/boot/cache/autoconfigure/HazelcastJCacheCustomizationConfiguration.java

@@ -21,6 +21,7 @@ import java.net.URI;
 import java.util.Properties;
 
 import com.hazelcast.core.HazelcastInstance;
+import org.jspecify.annotations.Nullable;
 
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
@@ -45,11 +46,11 @@ class HazelcastJCacheCustomizationConfiguration {
 
 	static class HazelcastPropertiesCustomizer implements JCachePropertiesCustomizer {
 
-		private final HazelcastInstance hazelcastInstance;
+		private final @Nullable HazelcastInstance hazelcastInstance;
 
 		private final CacheProperties cacheProperties;
 
-		HazelcastPropertiesCustomizer(HazelcastInstance hazelcastInstance, CacheProperties cacheProperties) {
+		HazelcastPropertiesCustomizer(@Nullable HazelcastInstance hazelcastInstance, CacheProperties cacheProperties) {
 			this.hazelcastInstance = hazelcastInstance;
 			this.cacheProperties = cacheProperties;
 		}

module/spring-boot-cache/src/main/java/org/springframework/boot/cache/autoconfigure/InfinispanCacheConfiguration.java

@@ -24,6 +24,7 @@ import org.infinispan.configuration.cache.ConfigurationBuilder;
 import org.infinispan.manager.DefaultCacheManager;
 import org.infinispan.manager.EmbeddedCacheManager;
 import org.infinispan.spring.embedded.provider.SpringEmbeddedCacheManager;
+import org.jspecify.annotations.Nullable;
 
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
@@ -80,7 +81,7 @@ public class InfinispanCacheConfiguration {
 	}
 
 	private org.infinispan.configuration.cache.Configuration getDefaultCacheConfiguration(
-			ConfigurationBuilder defaultConfigurationBuilder) {
+			@Nullable ConfigurationBuilder defaultConfigurationBuilder) {
 		if (defaultConfigurationBuilder != null) {
 			return defaultConfigurationBuilder.build();
 		}

module/spring-boot-cache/src/main/java/org/springframework/boot/cache/autoconfigure/JCacheCacheConfiguration.java

@@ -26,6 +26,8 @@ import javax.cache.Caching;
 import javax.cache.configuration.MutableConfiguration;
 import javax.cache.spi.CachingProvider;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.beans.factory.BeanClassLoaderAware;
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.condition.AnyNestedCondition;
@@ -61,6 +63,7 @@ import org.springframework.util.StringUtils;
 @Import(HazelcastJCacheCustomizationConfiguration.class)
 class JCacheCacheConfiguration implements BeanClassLoaderAware {
 
+	@SuppressWarnings("NullAway.Init")
 	private ClassLoader beanClassLoader;
 
 	@Override
@@ -103,7 +106,7 @@ class JCacheCacheConfiguration implements BeanClassLoaderAware {
 		return cachingProvider.getCacheManager(null, this.beanClassLoader, properties);
 	}
 
-	private CachingProvider getCachingProvider(String cachingProviderFqn) {
+	private CachingProvider getCachingProvider(@Nullable String cachingProviderFqn) {
 		if (StringUtils.hasText(cachingProviderFqn)) {
 			return Caching.getCachingProvider(cachingProviderFqn);
 		}

module/spring-boot-cache/src/main/java/org/springframework/boot/cache/autoconfigure/RedisCacheConfiguration.java

@@ -19,6 +19,8 @@ package org.springframework.boot.cache.autoconfigure;
 import java.util.LinkedHashSet;
 import java.util.List;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
@@ -73,12 +75,12 @@ class RedisCacheConfiguration {
 	private org.springframework.data.redis.cache.RedisCacheConfiguration determineConfiguration(
 			CacheProperties cacheProperties,
 			ObjectProvider<org.springframework.data.redis.cache.RedisCacheConfiguration> redisCacheConfiguration,
-			ClassLoader classLoader) {
+			@Nullable ClassLoader classLoader) {
 		return redisCacheConfiguration.getIfAvailable(() -> createConfiguration(cacheProperties, classLoader));
 	}
 
 	private org.springframework.data.redis.cache.RedisCacheConfiguration createConfiguration(
-			CacheProperties cacheProperties, ClassLoader classLoader) {
+			CacheProperties cacheProperties, @Nullable ClassLoader classLoader) {
 		Redis redisProperties = cacheProperties.getRedis();
 		org.springframework.data.redis.cache.RedisCacheConfiguration config = org.springframework.data.redis.cache.RedisCacheConfiguration
 			.defaultCacheConfig();

module/spring-boot-cache/src/main/java/org/springframework/boot/cache/autoconfigure/endpoint/package-info.java

@@ -17,4 +17,7 @@
 /**
  * Auto-configuration for the cache abstraction endpoints.
  */
+@NullMarked
 package org.springframework.boot.cache.autoconfigure.endpoint;
+
+import org.jspecify.annotations.NullMarked;

module/spring-boot-cache/src/main/java/org/springframework/boot/cache/autoconfigure/metrics/CacheMetricsRegistrarConfiguration.java

@@ -31,6 +31,7 @@ import org.springframework.cache.Cache;
 import org.springframework.cache.CacheManager;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.util.Assert;
 import org.springframework.util.StringUtils;
 
 /**
@@ -69,8 +70,11 @@ class CacheMetricsRegistrarConfiguration {
 	}
 
 	private void bindCacheManagerToRegistry(String beanName, CacheManager cacheManager) {
-		cacheManager.getCacheNames()
-			.forEach((cacheName) -> bindCacheToRegistry(beanName, cacheManager.getCache(cacheName)));
+		cacheManager.getCacheNames().forEach((cacheName) -> {
+			Cache cache = cacheManager.getCache(cacheName);
+			Assert.state(cache != null, () -> "'cache' must not be null. 'cacheName' is '%s'".formatted(cacheName));
+			bindCacheToRegistry(beanName, cache);
+		});
 	}
 
 	private void bindCacheToRegistry(String beanName, Cache cache) {

module/spring-boot-cache/src/main/java/org/springframework/boot/cache/autoconfigure/metrics/package-info.java

@@ -17,4 +17,7 @@
 /**
  * Auto-configuration for the cache abstraction metrics.
  */
+@NullMarked
 package org.springframework.boot.cache.autoconfigure.metrics;
+
+import org.jspecify.annotations.NullMarked;

module/spring-boot-cache/src/main/java/org/springframework/boot/cache/autoconfigure/package-info.java

@@ -17,4 +17,7 @@
 /**
  * Auto-configuration for the cache abstraction.
  */
+@NullMarked
 package org.springframework.boot.cache.autoconfigure;
+
+import org.jspecify.annotations.NullMarked;

module/spring-boot-cache/src/main/java/org/springframework/boot/cache/metrics/CacheMeterBinderProvider.java

@@ -18,6 +18,7 @@ package org.springframework.boot.cache.metrics;
 
 import io.micrometer.core.instrument.Tag;
 import io.micrometer.core.instrument.binder.MeterBinder;
+import org.jspecify.annotations.Nullable;
 
 import org.springframework.cache.Cache;
 
@@ -38,6 +39,6 @@ public interface CacheMeterBinderProvider<C extends Cache> {
 	 * @param tags tags to apply to all recorded metrics
 	 * @return a {@link MeterBinder} handling the specified {@link Cache} or {@code null}
 	 */
-	MeterBinder getMeterBinder(C cache, Iterable<Tag> tags);
+	@Nullable MeterBinder getMeterBinder(C cache, Iterable<Tag> tags);
 
 }

module/spring-boot-cache/src/main/java/org/springframework/boot/cache/metrics/CacheMetricsRegistrar.java

@@ -23,6 +23,7 @@ import io.micrometer.core.instrument.MeterRegistry;
 import io.micrometer.core.instrument.Tag;
 import io.micrometer.core.instrument.Tags;
 import io.micrometer.core.instrument.binder.MeterBinder;
+import org.jspecify.annotations.Nullable;
 
 import org.springframework.boot.util.LambdaSafe;
 import org.springframework.cache.Cache;
@@ -68,8 +69,9 @@ public class CacheMetricsRegistrar {
 		return false;
 	}
 
-	@SuppressWarnings({ "unchecked" })
-	private MeterBinder getMeterBinder(Cache cache, Tags tags) {
+	// Lambda isn't detected with the correct nullability
+	@SuppressWarnings({ "unchecked", "NullAway" })
+	private @Nullable MeterBinder getMeterBinder(Cache cache, Tags tags) {
 		Tags cacheTags = tags.and(getAdditionalTags(cache));
 		return LambdaSafe.callbacks(CacheMeterBinderProvider.class, this.binderProviders, cache)
 			.withLogger(CacheMetricsRegistrar.class)

module/spring-boot-cache/src/main/java/org/springframework/boot/cache/metrics/HazelcastCacheMeterBinderProvider.java

@@ -23,6 +23,7 @@ import com.hazelcast.spring.cache.HazelcastCache;
 import io.micrometer.core.instrument.Tag;
 import io.micrometer.core.instrument.binder.MeterBinder;
 import io.micrometer.core.instrument.binder.cache.HazelcastCacheMetrics;
+import org.jspecify.annotations.Nullable;
 
 import org.springframework.aot.hint.ExecutableMode;
 import org.springframework.aot.hint.RuntimeHints;
@@ -55,6 +56,7 @@ public class HazelcastCacheMeterBinderProvider implements CacheMeterBinderProvid
 	private MeterBinder createHazelcast4CacheMetrics(HazelcastCache cache, Iterable<Tag> tags) {
 		try {
 			Method nativeCacheAccessor = ReflectionUtils.findMethod(HazelcastCache.class, "getNativeCache");
+			Assert.state(nativeCacheAccessor != null, "'nativeCacheAccessor' must not be null");
 			Object nativeCache = ReflectionUtils.invokeMethod(nativeCacheAccessor, cache);
 			return HazelcastCacheMetrics.class.getConstructor(Object.class, Iterable.class)
 				.newInstance(nativeCache, tags);
@@ -67,7 +69,7 @@ public class HazelcastCacheMeterBinderProvider implements CacheMeterBinderProvid
 	static class HazelcastCacheMeterBinderProviderRuntimeHints implements RuntimeHintsRegistrar {
 
 		@Override
-		public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
+		public void registerHints(RuntimeHints hints, @Nullable ClassLoader classLoader) {
 			try {
 				Method getNativeCacheMethod = ReflectionUtils.findMethod(HazelcastCache.class, "getNativeCache");
 				Assert.state(getNativeCacheMethod != null, "Unable to find 'getNativeCache' method");

module/spring-boot-cache/src/main/java/org/springframework/boot/cache/metrics/RedisCacheMetrics.java

@@ -23,6 +23,7 @@ import io.micrometer.core.instrument.MeterRegistry;
 import io.micrometer.core.instrument.Tag;
 import io.micrometer.core.instrument.TimeGauge;
 import io.micrometer.core.instrument.binder.cache.CacheMeterBinder;
+import org.jspecify.annotations.Nullable;
 
 import org.springframework.data.redis.cache.RedisCache;
 
@@ -42,7 +43,7 @@ public class RedisCacheMetrics extends CacheMeterBinder<RedisCache> {
 	}
 
 	@Override
-	protected Long size() {
+	protected @Nullable Long size() {
 		return null;
 	}
 
@@ -57,7 +58,7 @@ public class RedisCacheMetrics extends CacheMeterBinder<RedisCache> {
 	}
 
 	@Override
-	protected Long evictionCount() {
+	protected @Nullable Long evictionCount() {
 		return null;
 	}
 

module/spring-boot-cache/src/main/java/org/springframework/boot/cache/metrics/package-info.java

@@ -17,4 +17,7 @@
 /**
  * Metrics for caches.
  */
+@NullMarked
 package org.springframework.boot.cache.metrics;
+
+import org.jspecify.annotations.NullMarked;