src/java.base/share/classes/java/util/jar/JarFile.java

*** 1003,1035 ****
                  // is this a multi-release jar file
                  if (MULTI_RELEASE_ENABLED) {
                      int i = match(MULTIRELEASE_CHARS, b, MULTIRELEASE_LASTOCC,
                              MULTIRELEASE_OPTOSFT);
                      if (i != -1) {
!                         i += MULTIRELEASE_CHARS.length;
!                         if (i < b.length) {
!                             byte c = b[i++];
!                             // Check that the value is followed by a newline
!                             // and does not have a continuation
!                             if (c == '\n' &&
!                                     (i == b.length || b[i] != ' ')) {
!                                 isMultiRelease = true;
!                             } else if (c == '\r') {
!                                 if (i == b.length) {
!                                     isMultiRelease = true;
!                                 } else {
!                                     c = b[i++];
!                                     if (c == '\n') {
!                                         if (i == b.length || b[i] != ' ') {
!                                             isMultiRelease = true;
!                                         }
!                                     } else if (c != ' ') {
!                                         isMultiRelease = true;
!                                     }
!                                 }
!                             }
!                         }
                      }
                  }
              }
              hasCheckedSpecialAttributes = true;
          }
--- 1003,1019 ----
                  // is this a multi-release jar file
                  if (MULTI_RELEASE_ENABLED) {
                      int i = match(MULTIRELEASE_CHARS, b, MULTIRELEASE_LASTOCC,
                              MULTIRELEASE_OPTOSFT);
                      if (i != -1) {
!                         // Read the main attributes of the manifest
!                         byte[] lbuf = new byte[512];
!                         Attributes attr = new Attributes();
!                         attr.read(new Manifest.FastInputStream(
!                             new ByteArrayInputStream(b)), lbuf);
!                         isMultiRelease = Boolean.parseBoolean(
!                             attr.getValue(Attributes.Name.MULTI_RELEASE));
                      }
                  }
              }
              hasCheckedSpecialAttributes = true;
          }