fix compiled consumer sample

spring-cloud-function-context/src/main/java/org/springframework/cloud/function/context/ContextFunctionCatalogAutoConfiguration.java

@@ -424,7 +424,7 @@ public class ContextFunctionCatalogAutoConfiguration {
 				}
 				else {
 					// TODO: compiled functions (only work as String -> String)
-					if (paramType.isWrapper()) {
+					if (paramType.isWrapper() && !Consumer.class.isAssignableFrom(definition.getBeanClass())) {
 						return Flux.class;
 					}
 					return String.class;

spring-cloud-function-samples/spring-cloud-function-sample-compiler/src/test/java/com/example/SampleCompiledConsumerTests.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2017 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
+ *
+ *      http://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 com.example;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.boot.context.embedded.LocalServerPort;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Mark Fisher
+ */
+@RunWith(SpringRunner.class)
+@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT,
+		properties = {
+				"spring.cloud.function.compile.test.lambda=com.example.SampleCompiledConsumerTests.Reference::set",
+				"spring.cloud.function.compile.test.type=consumer"
+		})
+public class SampleCompiledConsumerTests {
+
+	@LocalServerPort
+	private int port;
+
+	@Test
+	public void print() {
+		assertThat(new TestRestTemplate().postForObject(
+				"http://localhost:" + port + "/test", "it works",
+				String.class)).isEqualTo("it works");
+		assertEquals("it works", Reference.instance);
+	}
+
+	public static class Reference {
+
+		private static Object instance;
+
+		public static void set(Object o) {
+			instance = o;
+		}
+	}
+}

spring-cloud-function-samples/spring-cloud-function-sample-compiler/src/test/java/com/example/SampleCompiledFunctionTests.java

@@ -33,7 +33,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 @RunWith(SpringRunner.class)
 @SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT,
 		properties = "spring.cloud.function.compile.test.lambda=f->f.map(s->s+\"!!!\")")
-public class SampleApplicationTests {
+public class SampleCompiledFunctionTests {
 
 	@LocalServerPort
 	private int port;