spring-projects/spring-ai · warning

Due to failure in establishing JDBC connection or parsing me

Error message

Due to failure in establishing JDBC connection or parsing metadata, the JDBC database vendor could not be determined

What it means

JdbcChatMemoryRepositoryDialect.from(dataSource) extracts the database product name from JDBC metadata to pick a dialect. If establishing a connection or reading metadata fails, it logs this warning and falls through; with a null/empty product name the repository defaults to the Postgres dialect. The resulting dialect may emit SQL that fails on your actual database.

Source

Thrown at memory-repositories/spring-ai-model-chat-memory-repository-jdbc/src/main/java/org/springframework/ai/chat/memory/repository/jdbc/JdbcChatMemoryRepositoryDialect.java:72

	}

	/**
	 * Returns the SQL to delete all messages for a conversation.
	 */
	default String getDeleteMessagesSql() {
		return "DELETE FROM SPRING_AI_CHAT_MEMORY WHERE conversation_id = ?";
	}

	/**
	 * Detects the dialect from the DataSource.
	 */
	static JdbcChatMemoryRepositoryDialect from(DataSource dataSource) {
		String productName = null;
		try {
			productName = JdbcUtils.extractDatabaseMetaData(dataSource, DatabaseMetaData::getDatabaseProductName);
		}
		catch (Exception e) {
			logger.warn("Due to failure in establishing JDBC connection or parsing metadata, the JDBC database vendor "
					+ "could not be determined", e);
		}
		if (productName == null || productName.trim().isEmpty()) {
			logger.warn("Database product name is null or empty, defaulting to Postgres dialect.");
			return new PostgresChatMemoryRepositoryDialect();
		}
		return switch (productName) {
			case "PostgreSQL" -> new PostgresChatMemoryRepositoryDialect();
			case "MySQL", "MariaDB" -> new MysqlChatMemoryRepositoryDialect();
			case "Microsoft SQL Server" -> new SqlServerChatMemoryRepositoryDialect();
			case "HSQL Database Engine" -> new HsqldbChatMemoryRepositoryDialect();
			case "SQLite" -> new SqliteChatMemoryRepositoryDialect();
			case "H2" -> new H2ChatMemoryRepositoryDialect();
			case "Oracle" -> new OracleChatMemoryRepositoryDialect();
			default -> // Add more as needed
				new PostgresChatMemoryRepositoryDialect();
		};
	}

View on GitHub (pinned to 98a7beda4f)

Solutions

1. Fix the underlying connection problem — check the full stack trace attached to this warning (URL, host, port, credentials, driver on classpath)
2. Verify the database is up and reachable before app startup; consider fail-fast health checks
3. Set the dialect explicitly (JdbcChatMemoryRepository.builder().dialect(...)) so a metadata failure doesn't force the Postgres default
4. Confirm the JDBC driver version supports DatabaseMetaData.getDatabaseProductName() for your database

Example fix

// before: relies on auto-detection, silently defaults to Postgres on failure
JdbcChatMemoryRepository.builder().dataSource(dataSource).build();

// after: explicit dialect survives metadata failures
JdbcChatMemoryRepository.builder()
    .dataSource(dataSource)
    .dialect(new MysqlChatMemoryRepositoryDialect())
    .build();

try (Connection c = dataSource.getConnection()) {
    String name = c.getMetaData().getDatabaseProductName();
    if (name == null || name.isBlank()) { throw new IllegalStateException("DB metadata unavailable; set dialect explicitly"); }
}

try {
    JdbcChatMemoryRepository.builder().dataSource(ds).build();
} catch (Exception e) {
    logger.warn("Dialect detection failed; verify DB connectivity and driver", e);
    throw e; // fail fast rather than silently defaulting to Postgres
}

When it happens

Trigger: Calling from() (via resolveDialect at repository construction) when the DataSource cannot provide a connection (bad URL, DB down, wrong credentials) or metadata extraction throws (driver limitations, restricted permissions on DatabaseMetaData).

Common situations: Database temporarily unreachable during application startup; wrong JDBC URL or driver in config; DB user lacking metadata permissions; pooled datasource not yet initialized; third-party JDBC drivers that throw in getDatabaseProductName().

Understand the failure class

Background: Database query failed: Internal Server Error 500s wrapping SQL, Prisma, and connection failures — what to check first — this error's family across 16 libraries.

Related errors

• Database product name is null or empty, defaulting to Postgr
• Explicitly set dialect + explicitDialect.getClass().getSimpl
• DataSource must be set (either via dataSource() or jdbcTempl
• Failed to delete documents by filter
• JdbcChatMemoryRepository does not support tool call messages

AI-assisted analysis of spring-projects/spring-ai@98a7beda4f (2026-09-11). Data as JSON: /api/errors/96a0f1d8786ebb74. Report an issue: GitHub.