diff --git a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/jar/JarFile.java b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/jar/JarFile.java
index 65450ce395..65727df35d 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/jar/JarFile.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/jar/JarFile.java
@@ -26,8 +26,11 @@ import java.net.URL;
 import java.net.URLStreamHandler;
 import java.net.URLStreamHandlerFactory;
 import java.security.Permission;
+import java.util.ArrayList;
+import java.util.Collections;
 import java.util.Enumeration;
 import java.util.Iterator;
+import java.util.List;
 import java.util.Spliterator;
 import java.util.Spliterators;
 import java.util.function.Supplier;
@@ -93,6 +96,8 @@ public class JarFile extends AbstractJarFile implements Iterable<java.util.jar.J
 
 	private volatile JarFileWrapper wrapper;
 
+	private final List<JarFile> nestedJars = Collections.synchronizedList(new ArrayList<>());
+
 	/**
 	 * Create a new {@link JarFile} backed by the specified file.
 	 * @param file the root jar file
@@ -335,8 +340,10 @@ public class JarFile extends AbstractJarFile implements Iterable<java.util.jar.J
 							+ "mechanism used to create your executable jar file");
 		}
 		RandomAccessData entryData = this.entries.getEntryData(entry.getName());
-		return new JarFile(this.rootFile, this.pathFromRoot + "!/" + entry.getName(), entryData,
+		JarFile nestedJar = new JarFile(this.rootFile, this.pathFromRoot + "!/" + entry.getName(), entryData,
 				JarFileType.NESTED_JAR);
+		this.nestedJars.add(nestedJar);
+		return nestedJar;
 	}
 
 	@Override
@@ -361,6 +368,12 @@ public class JarFile extends AbstractJarFile implements Iterable<java.util.jar.J
 			if (this.type == JarFileType.DIRECT) {
 				this.rootFile.close();
 			}
+			if (this.wrapper != null) {
+				this.wrapper.close();
+			}
+			for (JarFile nestedJar : this.nestedJars) {
+				nestedJar.close();
+			}
 			this.closed = true;
 		}
 	}