How to truncate PostgreSQL tables from JDBC

I have a PostgreSQL database. I want to truncate some tables using JDBC What do I do?

This is what I've tried, but there's no work... Not even reporting any errors:

Use callablestatement

try (Connection connection = getConnection();
     CallableStatement statement = connection.prepareCall("TRUNCATE " + tableName)) {
  return statement.execute();
}

Use statement

try (Connection connection = getConnection();
     Statement statement  = connection.createStatement()) {
  return statement.execute("TRUNCATE " + tableName);
}

Use Preparedstatement

try (Connection connection = getConnection();
     PreparedStatement statement = connection.prepareStatement("TRUNCATE " + tableName)) {
  return statement.execute();
}

Solution

After truncation, I need to submit:

try (Connection connection = getConnection();
     Statement statement = connection.createStatement()) {
  int result = statement.executeUpdate("TRUNCATE " + tableName);
  connection.commit();
  return result;
}

Start with the documentation: