src/java.desktop/share/classes/sun/java2d/marlin/CollinearSimplifier.java

*** 144,154 ****
          }
      }
  
      private static float getSlope(float x1, float y1, float x2, float y2) {
          float dy = y2 - y1;
!         if (dy == 0f) {
              return (x2 > x1) ? Float.POSITIVE_INFINITY
                     : Float.NEGATIVE_INFINITY;
          }
          return (x2 - x1) / dy;
      }
--- 144,154 ----
          }
      }
  
      private static float getSlope(float x1, float y1, float x2, float y2) {
          float dy = y2 - y1;
!         if (dy == 0.0f) {
              return (x2 > x1) ? Float.POSITIVE_INFINITY
                     : Float.NEGATIVE_INFINITY;
          }
          return (x2 - x1) / dy;
      }