src/jdk.net/share/classes/jdk/net/ExtendedSocketOptions.java

*** 204,214 ****
                  if (fd == null || !fd.valid())
                      throw new SocketException("socket closed");
  
                  if (option == SO_FLOW_SLA) {
                      assert flowSupported;
!                     SocketFlow flow = checkValueType(value, option.type());
                      setFlowOption(fd, flow);
                  } else if (option == TCP_QUICKACK) {
                      setQuickAckOption(fd, (boolean) value);
                  } else if (option == TCP_KEEPCOUNT) {
                      setTcpkeepAliveProbes(fd, (Integer) value);
--- 204,214 ----
                  if (fd == null || !fd.valid())
                      throw new SocketException("socket closed");
  
                  if (option == SO_FLOW_SLA) {
                      assert flowSupported;
!                     SocketFlow flow = checkValueType(value, SocketFlow.class);
                      setFlowOption(fd, flow);
                  } else if (option == TCP_QUICKACK) {
                      setQuickAckOption(fd, (boolean) value);
                  } else if (option == TCP_KEEPCOUNT) {
                      setTcpkeepAliveProbes(fd, (Integer) value);
*** 252,267 ****
              }
          });
      }
  
      @SuppressWarnings("unchecked")
!     private static <T> T checkValueType(Object value, Class<?> type) {
          if (!type.isAssignableFrom(value.getClass())) {
              String s = "Found: " + value.getClass() + ", Expected: " + type;
              throw new IllegalArgumentException(s);
          }
!         return (T) value;
      }
  
      private static final JavaIOFileDescriptorAccess fdAccess =
              SharedSecrets.getJavaIOFileDescriptorAccess();
  
--- 252,267 ----
              }
          });
      }
  
      @SuppressWarnings("unchecked")
!     private static <T, U extends T> U checkValueType(Object value, Class<T> type) {
          if (!type.isAssignableFrom(value.getClass())) {
              String s = "Found: " + value.getClass() + ", Expected: " + type;
              throw new IllegalArgumentException(s);
          }
!         return (U) value;
      }
  
      private static final JavaIOFileDescriptorAccess fdAccess =
              SharedSecrets.getJavaIOFileDescriptorAccess();