Add support for Kotlin BeanPostProcessor beans

This commit adds support for Kotlin BeanPostProcessor beans which should
be defined in a companion object and annotated with `@JvmStatic`.

Closes gh-32946

spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassParser.java

@@ -360,6 +360,9 @@ class ConfigurationClassParser {
 		// Process individual @Bean methods
 		Set<MethodMetadata> beanMethods = retrieveBeanMethodMetadata(sourceClass);
 		for (MethodMetadata methodMetadata : beanMethods) {
+			if (methodMetadata.isAnnotated("kotlin.jvm.JvmStatic") && !methodMetadata.isStatic()) {
+				continue;
+			}
 			configClass.addBeanMethod(new BeanMethod(methodMetadata, configClass));
 		}
 

spring-context/src/test/kotlin/org/springframework/context/annotation/ConfigurationClassKotlinTests.kt

@@ -19,8 +19,10 @@ package org.springframework.context.annotation
 import org.assertj.core.api.Assertions.assertThat
 import org.assertj.core.api.Assertions.assertThatExceptionOfType
 import org.junit.jupiter.api.Test
+import org.springframework.beans.factory.config.BeanPostProcessor
 import org.springframework.beans.factory.getBean
 import org.springframework.beans.factory.parsing.BeanDefinitionParsingException
+import org.springframework.beans.factory.support.DefaultListableBeanFactory
 
 /**
  * Integration tests for Kotlin configuration classes.
@@ -43,6 +45,16 @@ class ConfigurationClassKotlinTests {
 		assertThat(context.getBean<Bar>().foo).isEqualTo(foo)
 	}
 
+	@Test
+	fun `Configuration with @JvmStatic registers a single bean`() {
+		val beanFactory = DefaultListableBeanFactory().apply {
+			isAllowBeanDefinitionOverriding = false
+		}
+		val context = AnnotationConfigApplicationContext(beanFactory)
+		context.register(ProcessorConfiguration::class.java)
+		context.refresh()
+	}
+
 
 	@Configuration
 	class FinalConfigurationWithProxy {
@@ -64,6 +76,19 @@ class ConfigurationClassKotlinTests {
 		fun bar(foo: Foo) = Bar(foo)
 	}
 
+	@Configuration
+	open class ProcessorConfiguration {
+
+		companion object {
+
+			@Bean
+			@JvmStatic
+			fun processor(): BeanPostProcessor {
+				return object: BeanPostProcessor{}
+			}
+		}
+	}
+
 	class Foo
 
 	class Bar(val foo: Foo)