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

@@ -80,10 +80,15 @@
     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