@Bean
  public HibernateJpaVendorAdapter getHibernateJPAVendorAdapter() {
    return new CustomHibernateJpaVendorAdaptor();
  }

  @NoArgsConstructor
  public static class CustomOracleDialect extends Oracle12cDialect {

    private final OracleChar INSTANCE = new OracleChar();

    @Override
    public void contributeTypes(final TypeContributions typeContributions, final ServiceRegistry serviceRegistry) {
      super.contributeTypes(typeContributions, serviceRegistry);
      typeContributions.contributeSqlTypeDescriptor(INSTANCE);
    }
  }

  public static class OracleChar extends CharTypeDescriptor {

    @Override
    public <X> ValueBinder<X> getBinder(final JavaTypeDescriptor<X> javaTypeDescriptor) {
      return new BasicBinder<>(javaTypeDescriptor, this) {
        @Override
        protected void doBind(PreparedStatement st, X value, int index, WrapperOptions options)
          throws SQLException {
          if (st.isWrapperFor(OraclePreparedStatement.class)) {
            st.unwrap(OraclePreparedStatement.class)
              .setFixedCHAR(index, javaTypeDescriptor.unwrap(value, String.class, options));
          } else {
            st.setString(index, javaTypeDescriptor.unwrap(value, String.class, options));
          }
        }

        @Override
        protected void doBind(CallableStatement st, X value, String name, WrapperOptions options)
          throws SQLException {
          if (st.isWrapperFor(OraclePreparedStatement.class)) {
            st.unwrap(OraclePreparedStatement.class)
              .setFixedCHARAtName(name, javaTypeDescriptor.unwrap(value, String.class, options));
          } else {
            st.setString(name, javaTypeDescriptor.unwrap(value, String.class, options));
          }
        }
      };
    }

    @Override
    public <X> ValueExtractor<X> getExtractor(final JavaTypeDescriptor<X> javaTypeDescriptor) {
      return new BasicExtractor<>(javaTypeDescriptor, this) {
        @Override
        protected X doExtract(ResultSet rs, String name, WrapperOptions options)
          throws SQLException {
          String val = rs.getString(name);
          return javaTypeDescriptor
            .wrap(val == null ? null : val.trim(), options);
        }

        @Override
        protected X doExtract(CallableStatement statement, int index, WrapperOptions options)
          throws SQLException {
          String val = statement.getString(index);
          return javaTypeDescriptor
            .wrap(val == null ? null : val.trim(), options);
        }

        @Override
        protected X doExtract(CallableStatement statement, String name, WrapperOptions options)
          throws SQLException {
          String val = statement.getString(name);
          return javaTypeDescriptor
            .wrap(val == null ? null : val.trim(), options);
        }
      };
    }
  }