diff --git a/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/jar/JarURLConnection.java b/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/jar/JarURLConnection.java
index d0ee8e2b29..2a70231623 100644
--- a/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/jar/JarURLConnection.java
+++ b/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/jar/JarURLConnection.java
@@ -82,7 +82,7 @@ class JarURLConnection extends java.net.JarURLConnection {
 
 	private final JarFile jarFile;
 
-	private final Permission permission;
+	private Permission permission;
 
 	private URL jarFileUrl;
 
@@ -103,8 +103,6 @@ class JarURLConnection extends java.net.JarURLConnection {
 		}
 		this.jarFile = jarFile;
 		this.jarEntryName = getJarEntryName(spec);
-		this.permission = new FilePermission(jarFile.getRootJarFile().getFile().getPath(),
-				READ_ACTION);
 	}
 
 	private String getNormalizedFileUrl(URL url) {
@@ -243,6 +241,10 @@ class JarURLConnection extends java.net.JarURLConnection {
 
 	@Override
 	public Permission getPermission() throws IOException {
+		if (this.permission == null) {
+			this.permission = new FilePermission(
+					this.jarFile.getRootJarFile().getFile().getPath(), READ_ACTION);
+		}
 		return this.permission;
 	}