Do not set launcher CL as parent

spring-cloud-stream-module-launcher/src/main/java/org/springframework/boot/loader/ModuleJarLauncher.java

@@ -16,7 +16,12 @@
 
 package org.springframework.boot.loader;
 
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.util.Collections;
+import java.util.LinkedHashSet;
 import java.util.List;
+import java.util.Set;
 
 import org.springframework.boot.loader.archive.Archive;
 import org.springframework.boot.loader.util.AsciiBytes;
@@ -31,8 +36,12 @@ public class ModuleJarLauncher extends ExecutableArchiveLauncher {
 
 	private static final AsciiBytes LIB = new AsciiBytes("lib/");
 
+	private final InputArgumentsJavaAgentDetector javaAgentDetector;
+
+
 	public ModuleJarLauncher(Archive archive) {
 		super(archive);
+		this.javaAgentDetector = new InputArgumentsJavaAgentDetector();
 	}
 
 	@Override
@@ -45,8 +54,51 @@ public class ModuleJarLauncher extends ExecutableArchiveLauncher {
 		archives.add(0, getArchive());
 	}
 
+
 	@Override
 	public void launch(String[] args) {
 		super.launch(args);
 	}
+
+	@Override
+	protected ClassLoader createClassLoader(URL[] urls) throws Exception {
+		Set<URL> copy = new LinkedHashSet<URL>(urls.length);
+		ClassLoader loader = getDefaultClassLoader();
+		if (loader instanceof URLClassLoader) {
+			for (URL url : ((URLClassLoader) loader).getURLs()) {
+				if (addDefaultClassloaderUrl(urls, url)) {
+					copy.add(url);
+				}
+			}
+		}
+		Collections.addAll(copy, urls);
+		return new LaunchedURLClassLoader(copy.toArray(new URL[copy.size()]), null);
+	}
+
+
+	private boolean addDefaultClassloaderUrl(URL[] urls, URL url) {
+		String jarUrl = "jar:" + url + "!/";
+		for (URL nestedUrl : urls) {
+			if (nestedUrl.equals(url) || nestedUrl.toString().equals(jarUrl)) {
+				return false;
+			}
+		}
+		return !this.javaAgentDetector.isJavaAgentJar(url);
+	}
+
+	private static ClassLoader getDefaultClassLoader() {
+		ClassLoader classloader = null;
+		try {
+			classloader = Thread.currentThread().getContextClassLoader();
+		}
+		catch (Throwable ex) {
+			// Cannot access thread context ClassLoader - falling back to system class
+			// loader...
+		}
+		if (classloader == null) {
+			// No thread context class loader -> use class loader of this class.
+			classloader = ExecutableArchiveLauncher.class.getClassLoader();
+		}
+		return classloader;
+	}
 }