Validate database connections explicitly

Always implement explicit database connection validation strategies to ensure robust application behavior during startup and runtime. This includes:

1. Configure validation queries with appropriate timeouts:

   quarkus.datasource.jdbc.validation-query-timeout=3
   quarkus.datasource.jdbc.validation-query=SELECT 1
   quarkus.datasource.jdbc.validate-on-borrow=true
   

2. Control database connectivity during startup:

   # Avoid unnecessary database connections during startup
   quarkus.hibernate-orm.database.start-offline=true
   

3. Implement connection validation in critical paths: ```java @Inject AgroalDataSource dataSource;

public void validateConnection() throws SQLException { try (Connection conn = dataSource.getConnection()) { // Execute validation query try (Statement stmt = conn.createStatement()) { stmt.setQueryTimeout(3); stmt.execute(“SELECT 1”); } } } ```

This approach:

• Prevents application failures due to database connectivity issues
• Reduces unnecessary database connections during startup
• Enables proper error handling and recovery
• Improves application reliability in distributed environments

Consider implementing these validations in health checks and critical service initialization points.