Specify generic type nullness in spring-beans

See gh-34140

spring-beans/src/main/java/org/springframework/beans/BeanUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -196,7 +196,7 @@ public abstract class BeanUtils {
 					return ctor.newInstance();
 				}
 				Class<?>[] parameterTypes = ctor.getParameterTypes();
-				Object[] argsWithDefaultValues = new Object[args.length];
+				@Nullable Object[] argsWithDefaultValues = new Object[args.length];
 				for (int i = 0 ; i < args.length; i++) {
 					if (args[i] == null) {
 						Class<?> parameterType = parameterTypes[i];
@@ -654,9 +654,10 @@ public abstract class BeanUtils {
 	 * @see ConstructorProperties
 	 * @see DefaultParameterNameDiscoverer
 	 */
-	public static String[] getParameterNames(Constructor<?> ctor) {
+	@SuppressWarnings("NullAway") // Dataflow analysis limitation
+	public static @Nullable String[] getParameterNames(Constructor<?> ctor) {
 		ConstructorProperties cp = ctor.getAnnotation(ConstructorProperties.class);
-		String[] paramNames = (cp != null ? cp.value() : parameterNameDiscoverer.getParameterNames(ctor));
+		@Nullable String[] paramNames = (cp != null ? cp.value() : parameterNameDiscoverer.getParameterNames(ctor));
 		Assert.state(paramNames != null, () -> "Cannot resolve parameter names for constructor " + ctor);
 		Assert.state(paramNames.length == ctor.getParameterCount(),
 				() -> "Invalid number of parameter names: " + paramNames.length + " for constructor " + ctor);

spring-beans/src/main/java/org/springframework/beans/factory/annotation/AutowiredAnnotationBeanPostProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -812,7 +812,7 @@ public class AutowiredAnnotationBeanPostProcessor implements SmartInstantiationA
 				return;
 			}
 			Method method = (Method) this.member;
-			Object[] arguments;
+			@Nullable Object[] arguments;
 			if (this.cached) {
 				try {
 					arguments = resolveCachedArguments(beanName, this.cachedMethodArguments);
@@ -838,20 +838,20 @@ public class AutowiredAnnotationBeanPostProcessor implements SmartInstantiationA
 			}
 		}
 
-		private Object @Nullable [] resolveCachedArguments(@Nullable String beanName, Object @Nullable [] cachedMethodArguments) {
+		private @Nullable Object @Nullable [] resolveCachedArguments(@Nullable String beanName, Object @Nullable [] cachedMethodArguments) {
 			if (cachedMethodArguments == null) {
 				return null;
 			}
-			Object[] arguments = new Object[cachedMethodArguments.length];
+			@Nullable Object[] arguments = new Object[cachedMethodArguments.length];
 			for (int i = 0; i < arguments.length; i++) {
 				arguments[i] = resolveCachedArgument(beanName, cachedMethodArguments[i]);
 			}
 			return arguments;
 		}
 
-		private Object @Nullable [] resolveMethodArguments(Method method, Object bean, @Nullable String beanName) {
+		private @Nullable Object @Nullable [] resolveMethodArguments(Method method, Object bean, @Nullable String beanName) {
 			int argumentCount = method.getParameterCount();
-			Object[] arguments = new Object[argumentCount];
+			@Nullable Object[] arguments = new Object[argumentCount];
 			DependencyDescriptor[] descriptors = new DependencyDescriptor[argumentCount];
 			Set<String> autowiredBeanNames = CollectionUtils.newLinkedHashSet(argumentCount);
 			Assert.state(beanFactory != null, "No BeanFactory available");

spring-beans/src/main/java/org/springframework/beans/factory/annotation/QualifierAnnotationAutowireCandidateResolver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -291,7 +291,7 @@ public class QualifierAnnotationAutowireCandidateResolver extends GenericTypeAwa
 			}
 		}
 
-		Map<String, Object> attributes = AnnotationUtils.getAnnotationAttributes(annotation);
+		Map<String, @Nullable Object> attributes = AnnotationUtils.getAnnotationAttributes(annotation);
 		if (attributes.isEmpty() && qualifier == null) {
 			// If no attributes, the qualifier must be present
 			return false;

spring-beans/src/main/java/org/springframework/beans/factory/aot/AutowiredArguments.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -74,7 +74,7 @@ public interface AutowiredArguments {
 	 * Return the arguments as an object array.
 	 * @return the arguments as an object array
 	 */
-	Object[] toArray();
+	@Nullable Object[] toArray();
 
 	/**
 	 * Factory method to create a new {@link AutowiredArguments} instance from
@@ -82,7 +82,7 @@ public interface AutowiredArguments {
 	 * @param arguments the arguments
 	 * @return a new {@link AutowiredArguments} instance
 	 */
-	static AutowiredArguments of(Object[] arguments) {
+	static AutowiredArguments of(@Nullable Object[] arguments) {
 		Assert.notNull(arguments, "'arguments' must not be null");
 		return () -> arguments;
 	}

spring-beans/src/main/java/org/springframework/beans/factory/aot/AutowiredMethodArgumentsResolver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -162,7 +162,7 @@ public final class AutowiredMethodArgumentsResolver extends AutowiredElementReso
 		Assert.isInstanceOf(AutowireCapableBeanFactory.class, beanFactory);
 		AutowireCapableBeanFactory autowireCapableBeanFactory = (AutowireCapableBeanFactory) beanFactory;
 		int argumentCount = method.getParameterCount();
-		Object[] arguments = new Object[argumentCount];
+		@Nullable Object[] arguments = new Object[argumentCount];
 		Set<String> autowiredBeanNames = CollectionUtils.newLinkedHashSet(argumentCount);
 		TypeConverter typeConverter = beanFactory.getTypeConverter();
 		for (int i = 0; i < argumentCount; i++) {

spring-beans/src/main/java/org/springframework/beans/factory/aot/BeanDefinitionPropertiesCodeGenerator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -111,7 +111,7 @@ class BeanDefinitionPropertiesCodeGenerator {
 		this.valueCodeGenerator = ValueCodeGenerator.with(allDelegates).scoped(generatedMethods);
 	}
 
-
+	@SuppressWarnings("NullAway") // https://github.com/uber/NullAway/issues/1128
 	CodeBlock generateCode(RootBeanDefinition beanDefinition) {
 		CodeBlock.Builder code = CodeBlock.builder();
 		addStatementForValue(code, beanDefinition, BeanDefinition::getScope,
@@ -344,7 +344,7 @@ class BeanDefinitionPropertiesCodeGenerator {
 	}
 
 	private <B extends BeanDefinition, T> void addStatementForValue(
-			CodeBlock.Builder code, BeanDefinition beanDefinition, Function<B, T> getter, String format) {
+			CodeBlock.Builder code, BeanDefinition beanDefinition, Function<B, @Nullable T> getter, String format) {
 
 		addStatementForValue(code, beanDefinition, getter,
 				(defaultValue, actualValue) -> !Objects.equals(defaultValue, actualValue), format);
@@ -352,14 +352,14 @@ class BeanDefinitionPropertiesCodeGenerator {
 
 	private <B extends BeanDefinition, T> void addStatementForValue(
 			CodeBlock.Builder code, BeanDefinition beanDefinition,
-			Function<B, T> getter, BiPredicate<T, T> filter, String format) {
+			Function<B, @Nullable T> getter, BiPredicate<T, T> filter, String format) {
 
 		addStatementForValue(code, beanDefinition, getter, filter, format, actualValue -> actualValue);
 	}
 
-	@SuppressWarnings("unchecked")
+	@SuppressWarnings({"unchecked", "NullAway"})
 	private <B extends BeanDefinition, T> void addStatementForValue(
-			CodeBlock.Builder code, BeanDefinition beanDefinition, Function<B, T> getter,
+			CodeBlock.Builder code, BeanDefinition beanDefinition, Function<B, @Nullable T> getter,
 			BiPredicate<T, T> filter, String format, Function<T, Object> formatter) {
 
 		T defaultValue = getter.apply((B) DEFAULT_BEAN_DEFINITION);

spring-beans/src/main/java/org/springframework/beans/factory/aot/BeanInstanceSupplier.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -200,7 +200,7 @@ public final class BeanInstanceSupplier<T> extends AutowiredElementResolver impl
 		}
 		else {
 			Executable executable = this.lookup.get(registeredBean);
-			Object[] arguments = resolveArguments(registeredBean, executable).toArray();
+			@Nullable Object[] arguments = resolveArguments(registeredBean, executable).toArray();
 			return invokeBeanSupplier(executable, () -> (T) instantiate(registeredBean, executable, arguments));
 		}
 	}
@@ -242,7 +242,7 @@ public final class BeanInstanceSupplier<T> extends AutowiredElementResolver impl
 
 	private AutowiredArguments resolveArguments(RegisteredBean registeredBean, Executable executable) {
 		int parameterCount = executable.getParameterCount();
-		Object[] resolved = new Object[parameterCount];
+		@Nullable Object[] resolved = new Object[parameterCount];
 		Assert.isTrue(this.shortcutBeanNames == null || this.shortcutBeanNames.length == resolved.length,
 				() -> "'shortcuts' must contain " + resolved.length + " elements");
 
@@ -341,7 +341,7 @@ public final class BeanInstanceSupplier<T> extends AutowiredElementResolver impl
 		}
 	}
 
-	private Object instantiate(RegisteredBean registeredBean, Executable executable, Object[] args) {
+	private Object instantiate(RegisteredBean registeredBean, Executable executable, @Nullable Object[] args) {
 		if (executable instanceof Constructor<?> constructor) {
 			return BeanUtils.instantiateClass(constructor, args);
 		}

spring-beans/src/main/java/org/springframework/beans/factory/config/BeanDefinitionVisitor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -220,7 +220,7 @@ public class BeanDefinitionVisitor {
 		return value;
 	}
 
-	protected void visitArray(Object[] arrayVal) {
+	protected void visitArray(@Nullable Object[] arrayVal) {
 		for (int i = 0; i < arrayVal.length; i++) {
 			Object elem = arrayVal[i];
 			Object newVal = resolveValue(elem);

spring-beans/src/main/java/org/springframework/beans/factory/config/ServiceLocatorFactoryBean.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -311,7 +311,7 @@ public class ServiceLocatorFactoryBean implements FactoryBean<Object>, BeanFacto
 	 */
 	protected Exception createServiceLocatorException(Constructor<Exception> exceptionConstructor, BeansException cause) {
 		Class<?>[] paramTypes = exceptionConstructor.getParameterTypes();
-		Object[] args = new Object[paramTypes.length];
+		@Nullable Object[] args = new Object[paramTypes.length];
 		for (int i = 0; i < paramTypes.length; i++) {
 			if (String.class == paramTypes[i]) {
 				args[i] = cause.getMessage();

spring-beans/src/main/java/org/springframework/beans/factory/support/AbstractAutowireCapableBeanFactory.java

@@ -548,7 +548,7 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 	 * @see #instantiateUsingFactoryMethod
 	 * @see #autowireConstructor
 	 */
-	protected Object doCreateBean(String beanName, RootBeanDefinition mbd, Object @Nullable [] args)
+	protected Object doCreateBean(String beanName, RootBeanDefinition mbd, @Nullable Object @Nullable [] args)
 			throws BeanCreationException {
 
 		// Instantiate the bean.
@@ -753,7 +753,7 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 							// Fully resolve parameter names and argument values.
 							ConstructorArgumentValues cav = mbd.getConstructorArgumentValues();
 							Class<?>[] paramTypes = candidate.getParameterTypes();
-							String[] paramNames = null;
+							@Nullable String[] paramNames = null;
 							if (cav.containsNamedArgument()) {
 								ParameterNameDiscoverer pnd = getParameterNameDiscoverer();
 								if (pnd != null) {
@@ -761,7 +761,7 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 								}
 							}
 							Set<ConstructorArgumentValues.ValueHolder> usedValueHolders = CollectionUtils.newHashSet(paramTypes.length);
-							Object[] args = new Object[paramTypes.length];
+							@Nullable Object[] args = new Object[paramTypes.length];
 							for (int i = 0; i < args.length; i++) {
 								ConstructorArgumentValues.ValueHolder valueHolder = cav.getArgumentValue(
 										i, paramTypes[i], (paramNames != null ? paramNames[i] : null), usedValueHolders);

spring-beans/src/main/java/org/springframework/beans/factory/support/AutowireUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -173,7 +173,7 @@ abstract class AutowireUtils {
 	 * @since 3.2.5
 	 */
 	public static Class<?> resolveReturnTypeForFactoryMethod(
-			Method method, Object[] args, @Nullable ClassLoader classLoader) {
+			Method method, @Nullable Object[] args, @Nullable ClassLoader classLoader) {
 
 		Assert.notNull(method, "Method must not be null");
 		Assert.notNull(args, "Argument array must not be null");

spring-beans/src/main/java/org/springframework/beans/factory/support/BeanDefinitionValueResolver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -287,7 +287,7 @@ public class BeanDefinitionValueResolver {
 		}
 		else if (value instanceof String[] values) {
 			boolean actuallyResolved = false;
-			Object[] resolvedValues = new Object[values.length];
+			@Nullable Object[] resolvedValues = new Object[values.length];
 			for (int i = 0; i < values.length; i++) {
 				String originalValue = values[i];
 				Object resolvedValue = doEvaluate(originalValue);

spring-beans/src/main/java/org/springframework/beans/factory/support/ConstructorResolver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -814,7 +814,7 @@ class ConstructorResolver {
 	/**
 	 * Resolve the prepared arguments stored in the given bean definition.
 	 */
-	private Object[] resolvePreparedArguments(String beanName, RootBeanDefinition mbd, BeanWrapper bw,
+	private @Nullable Object[] resolvePreparedArguments(String beanName, RootBeanDefinition mbd, BeanWrapper bw,
 			Executable executable, Object[] argsToResolve) {
 
 		TypeConverter customConverter = this.beanFactory.getCustomTypeConverter();
@@ -823,7 +823,7 @@ class ConstructorResolver {
 				new BeanDefinitionValueResolver(this.beanFactory, beanName, mbd, converter);
 		Class<?>[] paramTypes = executable.getParameterTypes();
 
-		Object[] resolvedArgs = new Object[argsToResolve.length];
+		@Nullable Object[] resolvedArgs = new Object[argsToResolve.length];
 		for (int argIndex = 0; argIndex < argsToResolve.length; argIndex++) {
 			Object argValue = argsToResolve[argIndex];
 			Class<?> paramType = paramTypes[argIndex];

spring-beans/src/main/java/org/springframework/beans/factory/support/DefaultListableBeanFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -357,7 +357,7 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 
 	@SuppressWarnings("unchecked")
 	@Override
-	public <T> T getBean(Class<T> requiredType, Object @Nullable ... args) throws BeansException {
+	public <T> T getBean(Class<T> requiredType, @Nullable Object @Nullable ... args) throws BeansException {
 		Assert.notNull(requiredType, "Required type must not be null");
 		Object resolved = resolveBean(ResolvableType.forRawClass(requiredType), args, false);
 		if (resolved == null) {
@@ -500,7 +500,7 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 		};
 	}
 
-	private <T> @Nullable T resolveBean(ResolvableType requiredType, Object @Nullable [] args, boolean nonUniqueAsNull) {
+	private <T> @Nullable T resolveBean(ResolvableType requiredType, @Nullable Object @Nullable [] args, boolean nonUniqueAsNull) {
 		NamedBeanHolder<T> namedBean = resolveNamedBean(requiredType, args, nonUniqueAsNull);
 		if (namedBean != null) {
 			return namedBean.getBeanInstance();
@@ -1411,7 +1411,7 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 
 	@SuppressWarnings("unchecked")
 	private <T> @Nullable NamedBeanHolder<T> resolveNamedBean(
-			ResolvableType requiredType, Object @Nullable [] args, boolean nonUniqueAsNull) throws BeansException {
+			ResolvableType requiredType, @Nullable Object @Nullable [] args, boolean nonUniqueAsNull) throws BeansException {
 
 		Assert.notNull(requiredType, "Required type must not be null");
 		String[] candidateNames = getBeanNamesForType(requiredType);
@@ -1465,7 +1465,7 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 	}
 
 	private <T> @Nullable NamedBeanHolder<T> resolveNamedBean(
-			String beanName, ResolvableType requiredType, Object @Nullable [] args) throws BeansException {
+			String beanName, ResolvableType requiredType, @Nullable Object @Nullable [] args) throws BeansException {
 
 		Object bean = getBean(beanName, null, args);
 		if (bean instanceof NullBean) {

spring-beans/src/main/java/org/springframework/beans/factory/xml/AbstractBeanDefinitionParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -58,6 +58,7 @@ public abstract class AbstractBeanDefinitionParser implements BeanDefinitionPars
 
 
 	@Override
+	@SuppressWarnings("NullAway") // Dataflow analysis limitation
 	public final @Nullable BeanDefinition parse(Element element, ParserContext parserContext) {
 		AbstractBeanDefinition definition = parseInternal(element, parserContext);
 		if (definition != null && !parserContext.isNested()) {

spring-beans/src/main/java/org/springframework/beans/propertyeditors/StringArrayPropertyEditor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -127,7 +127,7 @@ public class StringArrayPropertyEditor extends PropertyEditorSupport {
 
 	@Override
 	public void setAsText(String text) throws IllegalArgumentException {
-		String[] array = StringUtils.delimitedListToStringArray(text, this.separator, this.charsToDelete);
+		@Nullable String[] array = StringUtils.delimitedListToStringArray(text, this.separator, this.charsToDelete);
 		if (this.emptyArrayAsNull && array.length == 0) {
 			setValue(null);
 		}

spring-beans/src/main/java/org/springframework/beans/support/ArgumentConvertingMethodInvoker.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -130,7 +130,8 @@ public class ArgumentConvertingMethodInvoker extends MethodInvoker {
 	 * @param arguments the argument values to match against method parameters
 	 * @return a matching method, or {@code null} if none
 	 */
-	protected @Nullable Method doFindMatchingMethod(Object[] arguments) {
+	@SuppressWarnings("NullAway") // Dataflow analysis limitation
+	protected @Nullable Method doFindMatchingMethod(@Nullable Object[] arguments) {
 		TypeConverter converter = getTypeConverter();
 		if (converter != null) {
 			String targetMethod = getTargetMethod();
@@ -140,14 +141,14 @@ public class ArgumentConvertingMethodInvoker extends MethodInvoker {
 			Assert.state(targetClass != null, "No target class set");
 			Method[] candidates = ReflectionUtils.getAllDeclaredMethods(targetClass);
 			int minTypeDiffWeight = Integer.MAX_VALUE;
-			Object[] argumentsToUse = null;
+			@Nullable Object[] argumentsToUse = null;
 			for (Method candidate : candidates) {
 				if (candidate.getName().equals(targetMethod)) {
 					// Check if the inspected method has the correct number of parameters.
 					int parameterCount = candidate.getParameterCount();
 					if (parameterCount == argCount) {
 						Class<?>[] paramTypes = candidate.getParameterTypes();
-						Object[] convertedArguments = new Object[argCount];
+						@Nullable Object[] convertedArguments = new Object[argCount];
 						boolean match = true;
 						for (int j = 0; j < argCount && match; j++) {
 							// Verify that the supplied argument is assignable to the method parameter.