Java spock - how to test catch() block that doesnt throw exception back

How to test the below java catch block where in catch() doesnt throw exception back.

class ErrorTransImpl {
  private static final Logger logger = Logger.getLogger(ErrorTransImpl.class);

  public int errorCatcher(ErrorTrans transError){
    int ct = 0;
    if (transError != null){
      String query = "INSERT INTO tab_1 (rw1,rw2,rw3,rw4,rw5) VALUES (?,?,?,?,?)";
      try {
        ct =  jdbcTemplate.update(query, new Object[] {transError.col1(),transError.col2(), transError.col3(),transError.col4(),transError.col5()});
      }catch (DataAccessException ex) {
        logger.error(ex);
      }
    }
    return ct;
  }
}

I tried testing as below, but: 1>Unable to get into catch block. 2> Unable to test catch() even if inside as it doesnt throw exception back.

def 'throw DataAccess Exception upon incorrect update'() {
  given:
  def log = Mock(Logger)
  def originalLogger = ErrorTransImpl.logger
  ErrorTransImpl.logger = log
  ErrorTransImpl errTransImpl = Spy() {
    jdbcTemplate >> {
      throw new DataAccessException() {
        @Override
        String getMessage() {
          return super.getMessage()
        }
      }
    }
  }

  when:
  errTransImpl.errorCatcher(new ErrorTrans())

  then:
  //            thrown DataAccessException
  //Not sure what to assert or test here ??
}    

Can anyone help on how i test this?