Postgres Jdbc Driver 〈2025-2026〉

postgresql-<version>.jar Maven coordinates:

8.1 Common Errors | Error | Solution | |-------|----------| | The connection attempt failed | Check PostgreSQL running, firewall, pg_hba.conf | | No suitable driver found | Add JDBC jar to classpath | | FATAL: no pg_hba.conf entry | Add client IP/method to pg_hba.conf | | PSQLException: This connection has been closed | Reconnect or use connection pool | | PSQLException: Out of memory | Increase JVM heap or reduce result set size | 8.2 Best Practices Checklist ✅ Always use PreparedStatement (prevents SQL injection) ✅ Use try-with-resources for automatic closing ✅ Implement connection pooling (HikariCP) ✅ Set reasonable timeouts (connect, socket, login) ✅ Use fetchSize for large result sets postgres jdbc driver

conn.setAutoCommit(false); try // multiple operations conn.commit(); catch (SQLException e) conn.rollback(); finally conn.setAutoCommit(true); postgresql-<version>

pstmt.setObject(1, UUID.randomUUID()); UUID id = rs.getObject("id", UUID.class); 5.1 HikariCP (Best Performance) <dependency> <groupId>com.zaxxer</groupId> <artifactId>HikariCP</artifactId> <version>5.1.0</version> </dependency> HikariConfig config = new HikariConfig(); config.setJdbcUrl("jdbc:postgresql://localhost/mydb"); config.setUsername("user"); config.setPassword("pass"); config.setMaximumPoolSize(10); config.setMinimumIdle(5); config.setConnectionTimeout(30000); config.setIdleTimeout(600000); config.setPoolName("PostgresPool"); HikariDataSource dataSource = new HikariDataSource(config); try // multiple operations conn.commit()

<dependency> <groupId>org.postgresql</groupId> <artifactId>postgresql</artifactId> <version>42.7.3</version>  </dependency>