Fail operations when JarFile is closed

Update `JarFile` to track when the instance has been closed and throw
an exception in the same way that `ZipFile` does.

Closes gh-21072

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

@@ -30,17 +30,21 @@ import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.attribute.FileTime;
 import java.time.Instant;
+import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Enumeration;
+import java.util.Iterator;
 import java.util.List;
 import java.util.jar.JarEntry;
 import java.util.jar.JarInputStream;
 import java.util.jar.JarOutputStream;
 import java.util.jar.Manifest;
+import java.util.stream.Stream;
 import java.util.zip.CRC32;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipFile;
 
+import org.assertj.core.api.ThrowableAssert.ThrowingCallable;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -56,6 +60,7 @@ import org.springframework.util.StreamUtils;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
 import static org.assertj.core.api.Assertions.assertThatIOException;
+import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
 
@@ -171,6 +176,12 @@ class JarFileTests {
 		assertThat(entry.getName()).isEqualTo("1.dat");
 	}
 
+	@Test
+	void getJarEntryWhenClosed() throws Exception {
+		this.jarFile.close();
+		assertThatZipFileClosedIsThrownBy(() -> this.jarFile.getJarEntry("1.dat"));
+	}
+
 	@Test
 	void getInputStream() throws Exception {
 		InputStream inputStream = this.jarFile.getInputStream(this.jarFile.getEntry("1.dat"));
@@ -180,23 +191,41 @@ class JarFileTests {
 		assertThat(inputStream.read()).isEqualTo(-1);
 	}
 
+	@Test
+	void getInputStreamWhenClosed() throws Exception {
+		this.jarFile.close();
+		assertThatZipFileClosedIsThrownBy(() -> this.jarFile.getInputStream(this.jarFile.getEntry("1.dat")));
+	}
+
 	@Test
 	void getComment() {
 		assertThat(this.jarFile.getComment()).isEqualTo("outer");
 	}
 
+	@Test
+	void getCommentWhenClosed() throws Exception {
+		this.jarFile.close();
+		assertThatZipFileClosedIsThrownBy(() -> this.jarFile.getComment());
+	}
+
 	@Test
 	void getName() {
 		assertThat(this.jarFile.getName()).isEqualTo(this.rootJarFile.getPath());
 	}
 
 	@Test
-	void getSize() throws Exception {
+	void size() throws Exception {
 		try (ZipFile zip = new ZipFile(this.rootJarFile)) {
 			assertThat(this.jarFile.size()).isEqualTo(zip.size());
 		}
 	}
 
+	@Test
+	void sizeWhenClosed() throws Exception {
+		this.jarFile.close();
+		assertThatZipFileClosedIsThrownBy(() -> this.jarFile.size());
+	}
+
 	@Test
 	void getEntryTime() throws Exception {
 		java.util.jar.JarFile jdkJarFile = new java.util.jar.JarFile(this.rootJarFile);
@@ -603,6 +632,41 @@ class JarFileTests {
 		}
 	}
 
+	@Test
+	void iterator() {
+		Iterator<JarEntry> iterator = this.jarFile.iterator();
+		List<String> names = new ArrayList<String>();
+		while (iterator.hasNext()) {
+			names.add(iterator.next().getName());
+		}
+		assertThat(names).hasSize(12).contains("1.dat");
+	}
+
+	@Test
+	void iteratorWhenClosed() throws IOException {
+		this.jarFile.close();
+		assertThatZipFileClosedIsThrownBy(() -> this.jarFile.iterator());
+	}
+
+	@Test
+	void iteratorWhenClosedLater() throws IOException {
+		Iterator<JarEntry> iterator = this.jarFile.iterator();
+		iterator.next();
+		this.jarFile.close();
+		assertThatZipFileClosedIsThrownBy(() -> iterator.hasNext());
+	}
+
+	@Test
+	void stream() {
+		Stream<String> stream = this.jarFile.stream().map(JarEntry::getName);
+		assertThat(stream).hasSize(12).contains("1.dat");
+
+	}
+
+	private void assertThatZipFileClosedIsThrownBy(ThrowingCallable throwingCallable) {
+		assertThatIllegalStateException().isThrownBy(throwingCallable).withMessage("zip file closed");
+	}
+
 	private int getJavaVersion() {
 		try {
 			Object runtimeVersion = Runtime.class.getMethod("version").invoke(null);