// Check if connection is alive if (!conn.isValid(5)) // timeout 5 seconds conn = dataSource.getConnection(); // reconnect
// Store array Integer[] intArray = 1, 2, 3; Array array = conn.createArrayOf("integer", intArray); pstmt.setArray(1, array);
The server room felt a little less tense. The crisis was over. The bridge between the Java heap and the relational data store had been rebuilt, not with code, but with the simple act of updating a single, critical dependency. postgres jdbc driver
✅ (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
Thread.sleep(1000);
CopyManager copyManager = ((PGConnection) conn).getCopyAPI(); String sql = "COPY users (name, email) FROM STDIN"; CopyIn copyIn = copyManager.copyIn(sql);
"It’s the handshake," Elias said, gaining confidence. "The database expects GSSAPI encryption by default now. This old driver is trying to do a plain-text handshake, getting rejected, retrying with SSL but failing the cert validation because the cipher suites are outdated. It’s causing a race condition in the pool." // Check if connection is alive if (
public class PostgresDao private final HikariDataSource dataSource; public PostgresDao() HikariConfig config = new HikariConfig(); config.setJdbcUrl("jdbc:postgresql://localhost:5432/mydb"); config.setUsername(System.getenv("DB_USER")); config.setPassword(System.getenv("DB_PASS")); config.setMaximumPoolSize(10); config.addDataSourceProperty("cachePrepStmts", "true"); config.addDataSourceProperty("prepStmtCacheSize", "250"); config.addDataSourceProperty("prepStmtCacheSqlLimit", "2048"); this.dataSource = new HikariDataSource(config);