DoubleConverter implements PropertyConverter<Double> { @Override public int hashCode(){ return getClass().hashCode(); }  @Override Double convert(String value, ConversionContext ctx); @Override boolean equals(Object o); @Override int hashCode();  }
@Test public void testHashCode() { DoubleConverter instance = new DoubleConverter(); assertThat(instance.hashCode()).isEqualTo(DoubleConverter.class.hashCode()); }