src/java.base/share/classes/jdk/internal/jrtfs/JrtFileStore.java

*** 80,89 ****
--- 80,94 ----
      public long getTotalSpace() throws IOException {
          throw new UnsupportedOperationException("getTotalSpace");
      }
  
      @Override
+     public int getBlockSize() throws IOException {
+         throw new UnsupportedOperationException("getBlockSize");
+     }
+ 
+     @Override
      public long getUsableSpace() throws IOException {
          throw new UnsupportedOperationException("getUsableSpace");
      }
  
      @Override