8273935: (zipfs) Files.getFileAttributeView() throws UOE instead of returning null when view not supported

src/jdk.zipfs/share/classes/jdk/nio/zipfs/ZipPath.java

@@ -713,7 +713,7 @@ <V extends FileAttributeView> V getFileAttributeView(Class<V> type) {
             if (type == FileOwnerAttributeView.class)
                 return (V)new ZipPosixFileAttributeView(this,true);
         }
-        throw new UnsupportedOperationException("view <" + type + "> is not supported");
+        return null;
     }
 
     private ZipFileAttributeView getFileAttributeView(String type) {

test/jdk/jdk/nio/zipfs/TestPosix.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, SAP SE. All rights reserved.
+ * Copyright (c) 2019, 2021, SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -68,7 +68,7 @@
 
 /**
  * @test
- * @bug 8213031
+ * @bug 8213031 8273935
  * @modules jdk.zipfs
  *          jdk.jartool
  * @run testng TestPosix
@@ -595,7 +595,7 @@ public void testPosixDefaults() throws IOException {
             assertTrue(throwsUOE(()->Files.setPosixFilePermissions(entry, UW)));
             assertTrue(throwsUOE(()->Files.getOwner(entry)));
             assertTrue(throwsUOE(()->Files.setOwner(entry, DUMMY_USER)));
-            assertTrue(throwsUOE(()->Files.getFileAttributeView(entry, PosixFileAttributeView.class)));
+            assertNull(Files.getFileAttributeView(entry, PosixFileAttributeView.class));
         }
 
         // test with posix = true -> default values

test/jdk/jdk/nio/zipfs/testng/test/PosixAttributeViewTest.java

@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+package test;
+
+import org.testng.annotations.AfterTest;
+import org.testng.annotations.BeforeTest;
+import org.testng.annotations.DataProvider;
+import org.testng.annotations.Test;
+import util.ZipFsBaseTest;
+
+import java.io.IOException;
+import java.nio.file.FileSystem;
+import java.nio.file.FileSystems;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.attribute.PosixFileAttributeView;
+import java.util.Map;
+import java.util.zip.ZipEntry;
+
+/**
+ * @test
+ * @bug 8273935
+ * @summary Validate that Files.getFileAttributeView will not throw an
+ * Exception when the attribute view PosixFileAttributeView is not available
+ */
+public class PosixAttributeViewTest extends ZipFsBaseTest {
+    public static final String ZIP_ENTRY = "Entry-0";
+    private static final Path ZIP_FILE = Path.of("posixTest.zip");
+
+    /**
+     * Create initial Zip File
+     * @throws IOException if an error occurs
+     */
+    @BeforeTest
+    public void setup() throws IOException {
+        Files.deleteIfExists(ZIP_FILE);
+        Entry entry = Entry.of(ZIP_ENTRY, ZipEntry.DEFLATED,
+                "Tennis Anyone");
+        zip(ZIP_FILE, Map.of("create", "true"), entry);
+    }
+
+    /**
+     * Remove Zip File used by Test
+     * @throws IOException if an error occurs
+     */
+    @AfterTest
+    public void cleanup() throws IOException {
+        Files.deleteIfExists(ZIP_FILE);
+    }
+
+    /**
+     * DataProvider used to specify the Map indicating whether Posix
+     * file attributes have been enabled
+     * @return  map of the Zip FS properties to configure
+     */
+    @DataProvider
+    protected Object[][] zipfsMap() {
+        return new Object[][]{
+                {Map.of()},
+                {Map.of("enablePosixFileAttributes", "true")}
+        };
+    }
+
+    /**
+     * Verify that Files.getFileAttributeView will not throw
+     * an Exception when the attribute view
+     * PosixFileAttributeView is not available
+     * @param env map of the Zip FS properties to configure
+     * @throws Exception if an error occurs
+     */
+    @Test(dataProvider = "zipfsMap")
+    public void testPosixAttributeView(Map<String, String> env) throws Exception {
+        try (FileSystem fs = FileSystems.newFileSystem(ZIP_FILE, env)) {
+            Path entry = fs.getPath(ZIP_ENTRY);
+            PosixFileAttributeView view = Files.getFileAttributeView(entry,
+                    PosixFileAttributeView.class);
+            System.out.printf("View returned: %s, Map= %s%n", view,
+                    formatMap(env));
+        }
+    }
+}

test/jdk/jdk/nio/zipfs/testng/util/ZipFsBaseTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2020, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -105,7 +105,7 @@ protected Object[][] compressionMethods() {
      * @param env Map to format
      * @return Formatted string of the Map entries
      */
-    private static String formatMap(Map<String, ?> env) {
+    protected static String formatMap(Map<String, ?> env) {
         return env.entrySet().stream()
                 .map(e -> format("(%s:%s)", e.getKey(), e.getValue()))
                 .collect(joining(", "));