JDBC driver error: "syntax error at end of input" when no primary key

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

public class TestPgSql {

    /* test table schema:

        CREATE TABLE public.sample

        (

            id integer,

            value character varying(255) COLLATE pg_catalog."default"

        )

        WITH (

            OIDS = FALSE

        )

        TABLESPACE pg_default;

        INSERT INTO public.sample(id, value)

	VALUES (1, 'abcd');

    */    

    public static void main(String args[]) throws Exception {

        Connection conn = DriverManager.getConnection("jdbc:postgresql://localhost/...?user=....&password=....");

        String sql = "SELECT * FROM sample WHERE id = 1;";

        PreparedStatement stmt = conn.prepareStatement(sql, ResultSet.CONCUR_UPDATABLE, ResultSet.TYPE_FORWARD_ONLY);

        ResultSet rs = stmt.executeQuery();

        rs.next();

        rs.updateString("value", "something");

        rs.updateRow();

        rs.close();

    }

}

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