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

rev 16865 : 8176709: JarFileSystem::isMultiReleaseJar is incorrect
Reviewed-by: mchung

*** 26,39 ****
--- 26,41 ----
  package jdk.nio.zipfs;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.lang.Runtime.Version;
+ import java.nio.file.NoSuchFileException;
  import java.nio.file.Path;
  import java.util.Arrays;
  import java.util.HashMap;
  import java.util.Map;
+ import java.util.Objects;
  import java.util.TreeMap;
  import java.util.function.Consumer;
  import java.util.function.Function;
  import java.util.jar.Attributes;
  import java.util.jar.Manifest;
*** 84,99 ****
              lookup = createVersionedLinks(version < 0 ? 0 : version);
              setReadOnly();
          }
      }
  
!     private boolean isMultiReleaseJar() {
          try (InputStream is = newInputStream(getBytes("/META-INF/MANIFEST.MF"))) {
!             return (new Manifest(is)).getMainAttributes()
!                     .containsKey(new Attributes.Name("Multi-Release"));
!             // fixme change line above after JarFile integration to contain Attributes.Name.MULTI_RELEASE
!         } catch (IOException x) {
              return false;
          }
      }
  
      /**
--- 86,101 ----
              lookup = createVersionedLinks(version < 0 ? 0 : version);
              setReadOnly();
          }
      }
  
!     private boolean isMultiReleaseJar() throws IOException {
          try (InputStream is = newInputStream(getBytes("/META-INF/MANIFEST.MF"))) {
!             String multiRelease = new Manifest(is).getMainAttributes()
!                     .getValue(Attributes.Name.MULTI_RELEASE);
!             return "true".equalsIgnoreCase(multiRelease);
!         } catch (NoSuchFileException x) {
              return false;
          }
      }
  
      /**