More tests for auto detect of start class

spring-cloud-function-deployer/src/main/java/org/springframework/cloud/function/deployer/FunctionCreatorConfiguration.java

@@ -47,6 +47,7 @@ import org.springframework.beans.factory.config.BeanPostProcessor;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.loader.JarLauncher;
 import org.springframework.boot.loader.archive.Archive;
+import org.springframework.boot.loader.archive.ExplodedArchive;
 import org.springframework.boot.loader.archive.JarFileArchive;
 import org.springframework.cloud.deployer.resource.support.DelegatingResourceLoader;
 import org.springframework.cloud.function.context.FunctionRegistration;
@@ -160,7 +161,7 @@ class FunctionCreatorConfiguration {
 
 	private class ComputeLauncher extends JarLauncher {
 
-		public ComputeLauncher(JarFileArchive archive) {
+		public ComputeLauncher(Archive archive) {
 			super(archive);
 		}
 
@@ -168,7 +169,8 @@ class FunctionCreatorConfiguration {
 		public String getMainClass() throws Exception {
 			try {
 				return super.getMainClass();
-			} catch (Exception e) {
+			}
+			catch (Exception e) {
 				return null;
 			}
 		}
@@ -252,9 +254,11 @@ class FunctionCreatorConfiguration {
 				try {
 					File file = new File(url.toURI());
 					if (file.exists()) {
-						JarFileArchive archive = new JarFileArchive(file);
+						Archive archive = file.getName().endsWith(".jar")
+								? new JarFileArchive(file)
+								: new ExplodedArchive(file);
 						String main = new ComputeLauncher(archive).getMainClass();
-						if (main !=null) {
+						if (main != null) {
 							return main;
 						}
 					}
@@ -282,8 +286,13 @@ class FunctionCreatorConfiguration {
 				return Collections.singletonList(url);
 			}
 			try {
-				JarFileArchive archive = new JarFileArchive(new File(url.toURI()));
+				File file = new File(url.toURI());
-				return Arrays.asList(new ComputeLauncher(archive).getClassLoaderUrls());
+				if (file.exists()) {
+					JarFileArchive archive = new JarFileArchive(file);
+					return Arrays
+							.asList(new ComputeLauncher(archive).getClassLoaderUrls());
+				}
+				return Collections.singletonList(url);
 			}
 			catch (Exception e) {
 				throw new IllegalStateException("Cannot create class loader for " + url,

spring-cloud-function-deployer/src/test/java/org/springframework/cloud/function/deployer/FunctionCreatorConfigurationTests.java

@@ -59,6 +59,21 @@ public abstract class FunctionCreatorConfigurationTests {
 		}
 	}
 
+	@EnableAutoConfiguration
+	@TestPropertySource(properties = {
+			"function.location=app:classpath,file:target/test-classes,file:target/test-classes/app",
+			"function.bean=myDoubler" })
+	public static class SingleFunctionWithAutoMainTests
+			extends FunctionCreatorConfigurationTests {
+
+		@Test
+		public void testDouble() {
+			Function<Flux<Integer>, Flux<Integer>> function = catalog
+					.lookup(Function.class, "function0");
+			assertThat(function.apply(Flux.just(2)).blockFirst()).isEqualTo(4);
+		}
+	}
+
 	@EnableAutoConfiguration
 	@TestPropertySource(properties = { "function.location=app:classpath",
 			"function.bean=org.springframework.cloud.function.test.SpringDoubler" })

spring-cloud-function-deployer/src/test/resources/app/META-INF/MANIFEST.MF

@@ -0,0 +1,14 @@
+Manifest-Version: 1.0
+Implementation-Title: function-file-sample
+Implementation-Version: 1.0.0.M1
+Archiver-Version: Plexus Archiver
+Built-By: dsyer
+Implementation-Vendor-Id: com.example
+Spring-Boot-Version: 1.5.12.RELEASE
+Implementation-Vendor: Pivotal Software, Inc.
+Main-Class: org.springframework.boot.loader.JarLauncher
+Start-Class: org.springframework.cloud.function.test.FunctionApp
+Created-By: Apache Maven 3.5.0
+Build-Jdk: 1.8.0_131
+Implementation-URL: http://projects.spring.io/spring-boot/function-sam
+ ple/