Switch to JSpecify annotations

This commit updates the whole Spring Framework codebase to use JSpecify
annotations instead of Spring null-safety annotations with JSR 305
semantics.

JSpecify provides signficant enhancements such as properly defined
specifications, a canonical dependency with no split-package issue,
better tooling, better Kotlin integration and the capability to specify
generic type, array and varargs element null-safety. Generic type
null-safety is not defined by this commit yet and will be specified
later.

A key difference is that Spring null-safety annotations, following
JSR 305 semantics, apply to fields, parameters and return values,
while JSpecify annotations apply to type usages. That's why this
commit moves nullability annotations closer to the type for fields
and return values.

See gh-28797

spring-beans/src/testFixtures/java/org/springframework/beans/testfixture/beans/NestedTestBean.java

@@ -16,7 +16,7 @@
 
 package org.springframework.beans.testfixture.beans;
 
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
  * Simple nested test bean used for testing bean factories, AOP framework etc.

spring-beans/src/testFixtures/java/org/springframework/beans/testfixture/beans/Pet.java

@@ -18,7 +18,7 @@ package org.springframework.beans.testfixture.beans;
 
 import java.util.Objects;
 
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
  * @author Rob Harrop

spring-beans/src/testFixtures/java/org/springframework/beans/testfixture/beans/SerializablePerson.java

@@ -18,7 +18,8 @@ package org.springframework.beans.testfixture.beans;
 
 import java.io.Serializable;
 
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.util.ObjectUtils;
 
 /**

spring-beans/src/testFixtures/java/org/springframework/beans/testfixture/beans/TestBean.java

@@ -27,10 +27,11 @@ import java.util.Map;
 import java.util.Properties;
 import java.util.Set;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.beans.factory.BeanFactory;
 import org.springframework.beans.factory.BeanFactoryAware;
 import org.springframework.beans.factory.BeanNameAware;
-import org.springframework.lang.Nullable;
 import org.springframework.util.ObjectUtils;
 
 /**

spring-beans/src/testFixtures/java/org/springframework/beans/testfixture/beans/factory/aot/DeferredTypeBuilder.java

@@ -18,8 +18,9 @@ package org.springframework.beans.testfixture.beans.factory.aot;
 
 import java.util.function.Consumer;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.javapoet.TypeSpec;
-import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
@@ -31,8 +32,7 @@ import org.springframework.util.Assert;
  */
 public class DeferredTypeBuilder implements Consumer<TypeSpec.Builder> {
 
-	@Nullable
-	private Consumer<TypeSpec.Builder> type;
+	private @Nullable Consumer<TypeSpec.Builder> type;
 
 	@Override
 	public void accept(TypeSpec.Builder type) {

spring-beans/src/testFixtures/java/org/springframework/beans/testfixture/beans/factory/aot/GenericFactoryBean.java

@@ -16,9 +16,10 @@
 
 package org.springframework.beans.testfixture.beans.factory.aot;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.beans.BeanUtils;
 import org.springframework.beans.factory.FactoryBean;
-import org.springframework.lang.Nullable;
 
 /**
  * A public {@link FactoryBean} with a generic type.
@@ -33,15 +34,13 @@ public class GenericFactoryBean<T> implements FactoryBean<T> {
 		this.beanType = beanType;
 	}
 
-	@Nullable
 	@Override
-	public T getObject() throws Exception {
+	public @Nullable T getObject() throws Exception {
 		return BeanUtils.instantiateClass(this.beanType);
 	}
 
-	@Nullable
 	@Override
-	public Class<?> getObjectType() {
+	public @Nullable Class<?> getObjectType() {
 		return this.beanType;
 	}
 }

spring-beans/src/testFixtures/java/org/springframework/beans/testfixture/beans/factory/aot/package-info.java

@@ -1,9 +1,7 @@
 /**
  * Test fixtures for bean factories AOT support.
  */
-@NonNullApi
-@NonNullFields
+@NullMarked
 package org.springframework.beans.testfixture.beans.factory.aot;
 
-import org.springframework.lang.NonNullApi;
-import org.springframework.lang.NonNullFields;
+import org.jspecify.annotations.NullMarked;