GH-439 Fixed main class discovery

The regression was caused by filtering main classes that are @SpringVootApplication only, essentially excluding @SpringBootConfiguration

Resolves #439

spring-cloud-function-context/src/test/java/org/springframework/cloud/function/utils/FunctionClassUtilsTests.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2020-2020 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.utils;
+
+import java.net.URL;
+import java.net.URLClassLoader;
+
+import org.junit.Ignore;
+import org.junit.jupiter.api.Test;
+
+public class FunctionClassUtilsTests {
+
+	@Test
+	@Ignore
+	public void test() throws Exception {
+//		String fileName = "/Users/olegz/dev/workspaces/spring/spring-cloud-function/spring-cloud-function-samples/function-sample-aws/target/function-sample-aws-2.0.0.RELEASE-aws.jar";
+		String fileName = "/Users/olegz/Downloads/my.spring.functions/my.spring.functions.aws/target/tmp/my.spring.functions.aws-0.0.1-SNAPSHOT.jar";
+
+		URLClassLoader cl = new URLClassLoader(new URL[] {new URL("file:" + fileName)});
+		FunctionClassUtils.getStartClass(cl);
+	}
+
+}

spring-cloud-function-context/src/test/java/org/springframework/cloud/function/utils/JsonMapperTests.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.cloud.function.util;
+package org.springframework.cloud.function.utils;
 
 import java.util.Arrays;
 import java.util.List;