在portlet中添加postgres jdbc后，portlet无法启动

<dependency>
    <groupId>org.postgresql</groupId>
    <artifactId>postgresql</artifactId>
    <version>42.x.x</version>
</dependency>

<property name="jdbc.url" value="jdbc:postgresql://localhost:5432/mydatabase"/>
<property name="jdbc.username" value="myuser"/>
<property name="jdbc.password" value="mypassword"/>

GRANT ALL PRIVILEGES ON DATABASE mydatabase TO myuser;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DatabaseConnector {
    private static final String JDBC_URL = "jdbc:postgresql://localhost:5432/mydatabase";
    private static final String JDBC_USERNAME = "myuser";
    private static final String JDBC_PASSWORD = "mypassword";

    public static Connection getConnection() throws SQLException {
        return DriverManager.getConnection(JDBC_URL, JDBC_USERNAME, JDBC_PASSWORD);
    }

    public static void main(String[] args) {
        try (Connection connection = getConnection()) {
            System.out.println("Connected to the database!");
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}