GH-648 Fix Kotlin functions bootstrap

Resolves #648

spring-cloud-function-kotlin/src/test/java/org/springframework/cloud/function/kotlin/ContextFunctionCatalogAutoConfigurationKotlinTests.java

@@ -76,6 +76,13 @@ public class ContextFunctionCatalogAutoConfigurationKotlinTests {
 		assertThat(functionType.getRawType().getTypeName()).isEqualTo(Supplier.class.getName());
 		assertThat(functionType.getActualTypeArguments().length).isEqualTo(1);
 		assertThat(functionType.getActualTypeArguments()[0].getTypeName()).isEqualTo(String.class.getName());
+
+		function = this.context.getBean("kotlinPojoFunction");
+		functionType = (ParameterizedType) FunctionTypeUtils.discoverFunctionType(function, "kotlinPojoFunction", this.context);
+		assertThat(functionType.getRawType().getTypeName()).isEqualTo(Function.class.getName());
+		assertThat(functionType.getActualTypeArguments().length).isEqualTo(2);
+		assertThat(functionType.getActualTypeArguments()[0].getTypeName()).isEqualTo(Person.class.getName());
+		assertThat(functionType.getActualTypeArguments()[1].getTypeName()).isEqualTo(String.class.getName());
 	}
 
 	@Test

spring-cloud-function-kotlin/src/test/kotlin/org/springframework/cloud/function/kotlin/KotlinLambdasConfiguration.kt

@@ -27,24 +27,29 @@ import java.util.function.Function
  */
 @EnableAutoConfiguration
 @Configuration
-open class KotlinLambdasConfiguration {
+class KotlinLambdasConfiguration {
 	@Bean
-	open fun kotlinFunction(): (String) -> String {
+	fun kotlinFunction(): (String) -> String {
 		return { it.toUpperCase() }
 	}
+	
+	@Bean
+	fun kotlinPojoFunction(): (Person) -> String {
+		return { it.name.toString()}
+	}
 
 	@Bean
-	open fun kotlinConsumer(): (String) -> Unit {
+	fun kotlinConsumer(): (String) -> Unit {
 		return { println(it) }
 	}
 
 	@Bean
-	open fun kotlinSupplier(): () -> String {
+	fun kotlinSupplier(): () -> String {
 		return { "Hello" }
 	}
 
 	@Bean
-	open fun javaFunction(): Function<String, String> {
+	fun javaFunction(): Function<String, String> {
 		return Function { x -> x }
 	}
 }

spring-cloud-function-kotlin/src/test/kotlin/org/springframework/cloud/function/kotlin/Person.kt

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2012-2021 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.function.kotlin
+
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+import java.util.function.Function
+
+/**
+ * @author Oleg Zhurakousky
+ *
+ */
+class Person {
+	
+	var name:String? = null;
+	
+	
+}