The following example will not throw a FileAlreadyExistsException:

    @Test
       public void zipFAETest(final Map<String, String> env,
                                final int compression) throws Exception {
        Path zipFile = generatePath(HERE, "test", ".zip");
        Files.deleteIfExists(zipFile);
        Entry e0 = Entry.of("Entry-0", compression, THE_SLAMS);
        zip(zipFile, env, e0);

        // Validate that a FileAlreadyExistsException is thrown
        try (FileSystem zipfs = FileSystems.newFileSystem(zipFile, env)) {
            assertThrows(FileAlreadyExistsException.class, () ->
                    Files.newByteChannel(zipfs.getPath(e0.name), Set.of(CREATE_NEW)));
        }
        Files.deleteIfExists(zipFile);
    }



If you specify Set.of(CREATE_NEW, WRITE) you will get the expected Exception