Remove NullAway suppressions where possible

See gh-46926

build-plugin/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/tasks/buildinfo/BuildInfoProperties.java

@@ -142,9 +142,9 @@ public abstract class BuildInfoProperties implements Serializable {
 		return coerceToStringValues(applyExclusions(getAdditional().getOrElse(Collections.emptyMap())));
 	}
 
-	@SuppressWarnings("NullAway") // Doesn't detect lambda with correct nullability
 	private <T> @Nullable T getIfNotExcluded(Property<T> property, String name) {
-		return getIfNotExcluded(property, name, () -> null);
+		Supplier<@Nullable T> supplier = () -> null;
+		return getIfNotExcluded(property, name, supplier);
 	}
 
 	private <T> @Nullable T getIfNotExcluded(Property<T> property, String name, Supplier<@Nullable T> defaultValue) {

build-plugin/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/StartMojo.java

@@ -156,12 +156,12 @@ public class StartMojo extends AbstractRunMojo {
 		}
 	}
 
-	@SuppressWarnings("NullAway") // Lambda isn't detected with the correct nullability
 	private void doWaitForSpringApplication(MBeanServerConnection connection)
 			throws MojoExecutionException, MojoFailureException {
 		final SpringApplicationAdminClient client = new SpringApplicationAdminClient(connection, this.jmxName);
 		try {
-			execute(this.wait, this.maxAttempts, () -> (client.isReady() ? true : null));
+			Callable<@Nullable Boolean> isReady = () -> (client.isReady() ? true : null);
+			execute(this.wait, this.maxAttempts, isReady);
 		}
 		catch (ReflectionException ex) {
 			throw new MojoExecutionException("Unable to retrieve 'ready' attribute", ex.getCause());

core/spring-boot/src/main/java/org/springframework/boot/DefaultBootstrapContext.java

@@ -91,9 +91,9 @@ public class DefaultBootstrapContext implements ConfigurableBootstrapContext {
 	}
 
 	@Override
-	@SuppressWarnings("NullAway") // Doesn't detect lambda with correct nullability
 	public <T> @Nullable T getOrElse(Class<T> type, @Nullable T other) {
-		return getOrElseSupply(type, () -> other);
+		Supplier<@Nullable T> supplier = () -> other;
+		return getOrElseSupply(type, supplier);
 	}
 
 	@Override

core/spring-boot/src/main/java/org/springframework/boot/context/properties/bind/Binder.java

@@ -459,7 +459,6 @@ public class Binder {
 		return null;
 	}
 
-	@SuppressWarnings("NullAway") // Doesn't detect lambda with correct nullability
 	private <T> @Nullable Object bindAggregate(ConfigurationPropertyName name, Bindable<T> target, BindHandler handler,
 			Context context, AggregateBinder<?> aggregateBinder) {
 		AggregateElementBinder elementBinder = (itemName, itemTarget, source) -> {
@@ -467,7 +466,8 @@ public class Binder {
 			Supplier<?> supplier = () -> bind(itemName, itemTarget, handler, context, allowRecursiveBinding, false);
 			return context.withSource(source, supplier);
 		};
-		return context.withIncreasedDepth(() -> aggregateBinder.bind(name, target, elementBinder));
+		Supplier<@Nullable Object> supplier = () -> aggregateBinder.bind(name, target, elementBinder);
+		return context.withIncreasedDepth(supplier);
 	}
 
 	private <T> @Nullable ConfigurationProperty findProperty(ConfigurationPropertyName name, Bindable<T> target,
@@ -492,7 +492,6 @@ public class Binder {
 		return result;
 	}
 
-	@SuppressWarnings("NullAway") // Doesn't detect lambda with correct nullability
 	private @Nullable Object bindDataObject(ConfigurationPropertyName name, Bindable<?> target, BindHandler handler,
 			Context context, boolean allowRecursiveBinding) {
 		if (isUnbindableBean(name, target, context)) {
@@ -505,8 +504,9 @@ public class Binder {
 		}
 		DataObjectPropertyBinder propertyBinder = (propertyName, propertyTarget) -> bind(name.append(propertyName),
 				propertyTarget, handler, context, false, false);
-		return context.withDataObject(type, () -> fromDataObjectBinders(bindMethod,
-				(dataObjectBinder) -> dataObjectBinder.bind(name, target, context, propertyBinder)));
+		Supplier<@Nullable Object> supplier = () -> fromDataObjectBinders(bindMethod,
+				(dataObjectBinder) -> dataObjectBinder.bind(name, target, context, propertyBinder));
+		return context.withDataObject(type, supplier);
 	}
 
 	private @Nullable Object fromDataObjectBinders(@Nullable BindMethod bindMethod,

core/spring-boot/src/main/java/org/springframework/boot/context/properties/source/MutuallyExclusiveConfigurationPropertiesException.java

@@ -101,9 +101,9 @@ public class MutuallyExclusiveConfigurationPropertiesException extends RuntimeEx
 	 * non-null values are defined in a set of entries.
 	 * @param entries a consumer used to populate the entries to check
 	 */
-	@SuppressWarnings("NullAway") // Doesn't detect lambda with correct nullability
 	public static void throwIfMultipleNonNullValuesIn(Consumer<Map<String, @Nullable Object>> entries) {
-		throwIfMultipleMatchingValuesIn(entries, Objects::nonNull);
+		Predicate<@Nullable Object> isNonNull = Objects::nonNull;
+		throwIfMultipleMatchingValuesIn(entries, isNonNull);
 	}
 
 	/**

core/spring-boot/src/main/java/org/springframework/boot/util/LambdaSafe.java

@@ -252,13 +252,12 @@ public final class LambdaSafe {
 		 * Invoke the callback instance where the callback method returns void.
 		 * @param invoker the invoker used to invoke the callback
 		 */
-		// Lambda isn't detected with the correct nullability
-		@SuppressWarnings("NullAway")
 		public void invoke(Consumer<C> invoker) {
-			invoke(this.callbackInstance, () -> {
+			Supplier<@Nullable Void> supplier = () -> {
 				invoker.accept(this.callbackInstance);
 				return null;
-			});
+			};
+			invoke(this.callbackInstance, supplier);
 		}
 
 		/**
@@ -268,10 +267,9 @@ public final class LambdaSafe {
 		 * @return the result of the invocation (may be {@link InvocationResult#noResult}
 		 * if the callback was not invoked)
 		 */
-		// Lambda isn't detected with the correct nullability
-		@SuppressWarnings("NullAway")
 		public <R> InvocationResult<R> invokeAnd(Function<C, @Nullable R> invoker) {
-			return invoke(this.callbackInstance, () -> invoker.apply(this.callbackInstance));
+			Supplier<@Nullable R> supplier = () -> invoker.apply(this.callbackInstance);
+			return invoke(this.callbackInstance, supplier);
 		}
 
 	}
@@ -296,13 +294,14 @@ public final class LambdaSafe {
 		 * Invoke the callback instances where the callback method returns void.
 		 * @param invoker the invoker used to invoke the callback
 		 */
-		// Lambda isn't detected with the correct nullability
-		@SuppressWarnings("NullAway")
 		public void invoke(Consumer<C> invoker) {
-			this.callbackInstances.forEach((callbackInstance) -> invoke(callbackInstance, () -> {
-				invoker.accept(callbackInstance);
-				return null;
-			}));
+			this.callbackInstances.forEach((callbackInstance) -> {
+				Supplier<@Nullable Void> supplier = () -> {
+					invoker.accept(callbackInstance);
+					return null;
+				};
+				invoke(callbackInstance, supplier);
+			});
 		}
 
 		/**
@@ -312,11 +311,11 @@ public final class LambdaSafe {
 		 * @return the results of the invocation (may be an empty stream if no callbacks
 		 * could be called)
 		 */
-		// Lambda isn't detected with the correct nullability
-		@SuppressWarnings("NullAway")
 		public <R> Stream<R> invokeAnd(Function<C, @Nullable R> invoker) {
-			Function<C, InvocationResult<R>> mapper = (callbackInstance) -> invoke(callbackInstance,
-					() -> invoker.apply(callbackInstance));
+			Function<C, InvocationResult<R>> mapper = (callbackInstance) -> {
+				Supplier<@Nullable R> supplier = () -> invoker.apply(callbackInstance);
+				return invoke(callbackInstance, supplier);
+			};
 			return this.callbackInstances.stream()
 				.map(mapper)
 				.filter(InvocationResult::hasResult)

module/spring-boot-http-client/src/main/java/org/springframework/boot/http/client/autoconfigure/ClientHttpRequestFactories.java

@@ -100,7 +100,6 @@ public final class ClientHttpRequestFactories {
 		return getProperty(accessor, Function.identity(), predicate, fallback, fallbackAccessor);
 	}
 
-	@SuppressWarnings("NullAway") // Lambda isn't detected with the correct nullability
 	private <P, T, F> @Nullable T getProperty(Function<AbstractHttpRequestFactoryProperties, @Nullable P> accessor,
 			Function<P, @Nullable T> extractor, Predicate<@Nullable T> predicate, @Nullable F fallback,
 			Function<F, @Nullable T> fallbackAccessor) {

module/spring-boot-jdbc/src/main/java/org/springframework/boot/jdbc/metrics/DataSourcePoolMetrics.java

@@ -81,7 +81,6 @@ public class DataSourcePoolMetrics implements MeterBinder {
 		}
 	}
 
-	@SuppressWarnings("NullAway") // Lambda isn't detected with the correct nullability
 	private <N extends Number> void bindPoolMetadata(MeterRegistry registry, String metricName, String description,
 			Function<DataSourcePoolMetadata, @Nullable N> function) {
 		bindDataSource(registry, metricName, description, this.metadataProvider.getValueFunction(function));

module/spring-boot-micrometer-metrics/src/main/java/org/springframework/boot/micrometer/metrics/autoconfigure/PropertiesMeterFilter.java

@@ -117,21 +117,21 @@ public class PropertiesMeterFilter implements MeterFilter {
 		return (value != null) ? MeterValue.valueOf(value).getValue(meterType) : null;
 	}
 
-	@SuppressWarnings("NullAway") // Lambda isn't detected with the correct nullability
 	private <T> @Nullable T lookup(Map<String, T> values, Id id, @Nullable T defaultValue) {
 		if (values.isEmpty()) {
 			return defaultValue;
 		}
-		return doLookup(values, id, () -> defaultValue);
+		Supplier<@Nullable T> getDefaultValue = () -> defaultValue;
+		return doLookup(values, id, getDefaultValue);
 	}
 
 	@Contract("_, _, !null -> !null")
-	@SuppressWarnings("NullAway") // Lambda isn't detected with the correct nullability
 	private <T> @Nullable T lookupWithFallbackToAll(Map<String, T> values, Id id, @Nullable T defaultValue) {
 		if (values.isEmpty()) {
 			return defaultValue;
 		}
-		return doLookup(values, id, () -> values.getOrDefault("all", defaultValue));
+		Supplier<@Nullable T> getAllOrDefaultValue = () -> values.getOrDefault("all", defaultValue);
+		return doLookup(values, id, getAllOrDefaultValue);
 	}
 
 	private <T> @Nullable T doLookup(Map<String, T> values, Id id, Supplier<@Nullable T> defaultValue) {

module/spring-boot-r2dbc/src/main/java/org/springframework/boot/r2dbc/autoconfigure/R2dbcAutoConfiguration.java

@@ -83,23 +83,19 @@ public final class R2dbcAutoConfiguration {
 			return optionsBuilder.build();
 		}
 
-		// Lambda isn't detected with the correct nullability
-		@SuppressWarnings("NullAway")
 		private void configureDatabase(Builder optionsBuilder, ConnectionFactoryOptions urlOptions) {
-			configureIf(optionsBuilder, urlOptions, ConnectionFactoryOptions.DATABASE,
-					() -> determineDatabaseName(this.properties));
+			Supplier<@Nullable String> getDatabaseName = () -> determineDatabaseName(this.properties);
+			configureIf(optionsBuilder, urlOptions, ConnectionFactoryOptions.DATABASE, getDatabaseName);
 		}
 
-		// Lambda isn't detected with the correct nullability
-		@SuppressWarnings("NullAway")
 		private void configurePassword(Builder optionsBuilder, ConnectionFactoryOptions urlOptions) {
-			configureIf(optionsBuilder, urlOptions, ConnectionFactoryOptions.PASSWORD, this.properties::getPassword);
+			Supplier<@Nullable CharSequence> getPassword = this.properties::getPassword;
+			configureIf(optionsBuilder, urlOptions, ConnectionFactoryOptions.PASSWORD, getPassword);
 		}
 
-		// Lambda isn't detected with the correct nullability
-		@SuppressWarnings("NullAway")
 		private void configureUser(Builder optionsBuilder, ConnectionFactoryOptions urlOptions) {
-			configureIf(optionsBuilder, urlOptions, ConnectionFactoryOptions.USER, this.properties::getUsername);
+			Supplier<@Nullable String> getUsername = this.properties::getUsername;
+			configureIf(optionsBuilder, urlOptions, ConnectionFactoryOptions.USER, getUsername);
 		}
 
 		private <T extends CharSequence> void configureIf(Builder optionsBuilder,