Hide loader classes from Tomcat's ServletContext resource paths

See gh-17538

Author: adavid9

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/tomcat/TomcatServletWebServerFactory.java

@@ -31,6 +31,7 @@
 import java.util.List;
 import java.util.Locale;
 import java.util.Set;
+import java.util.stream.Collectors;
 
 import javax.servlet.ServletContainerInitializer;
 
@@ -88,6 +89,7 @@
  * @author Andy Wilkinson
  * @author Eddú Meléndez
  * @author Christoffer Sawicki
+ * @author Dawid Antecki
  * @since 2.0.0
  * @see #setPort(int)
  * @see #setContextLifecycleListeners(Collection)
@@ -751,7 +753,8 @@ public String[] list(String path) {
 
 		@Override
 		public Set<String> listWebAppPaths(String path) {
-			return this.delegate.listWebAppPaths(path);
+			return this.delegate.listWebAppPaths(path).stream()
+					.filter((p) -> !p.startsWith("org/springframework/boot/loader")).collect(Collectors.toSet());
 		}
 
 		@Override