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