Merge pull request #21365 from izeye

* pr/21365:
  Fix JarFileTests.getInputStreamWhenClosed()

Closes gh-21365

spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/jar/JarFileTests.java

@@ -193,8 +193,9 @@ class JarFileTests {
 
 	@Test
 	void getInputStreamWhenClosed() throws Exception {
+		ZipEntry entry = this.jarFile.getEntry("1.dat");
 		this.jarFile.close();
-		assertThatZipFileClosedIsThrownBy(() -> this.jarFile.getInputStream(this.jarFile.getEntry("1.dat")));
+		assertThatZipFileClosedIsThrownBy(() -> this.jarFile.getInputStream(entry));
 	}
 
 	@Test