Remove redundant hash from path of unpacked nested library

Closes gh-4124

Author: wilkinsona

spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/archive/JarFileArchive.java

@@ -114,12 +114,11 @@ protected Archive getNestedArchive(Entry entry) throws IOException {
 	}
 
 	private Archive getUnpackedNestedArchive(JarEntryData data) throws IOException {
-		AsciiBytes hash = data.getComment().substring(UNPACK_MARKER.length());
 		String name = data.getName().toString();
 		if (name.lastIndexOf("/") != -1) {
 			name = name.substring(name.lastIndexOf("/") + 1);
 		}
-		File file = new File(getTempUnpackFolder(), hash.toString() + "-" + name);
+		File file = new File(getTempUnpackFolder(), name);
 		if (!file.exists() || file.length() != data.getSize()) {
 			unpack(data, file);
 		}

spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/archive/JarFileArchiveTests.java

@@ -97,7 +97,7 @@ public void getNestedUnpackedArchive() throws Exception {
 		Entry entry = getEntriesMap(this.archive).get("nested.jar");
 		Archive nested = this.archive.getNestedArchive(entry);
 		assertThat(nested.getUrl().toString(), startsWith("file:"));
-		assertThat(nested.getUrl().toString(), endsWith(".jar"));
+		assertThat(nested.getUrl().toString(), endsWith("/nested.jar"));
 	}
 
 	@Test