DatabaseMetaData is a JDBC interface used to obtain information about the database, JDBC driver, tables, columns, and supported database features. It is obtained from a Connection object using the getMetaData() method. Using DatabaseMetaData, a Java program can dynamically inspect database information without directly querying system tables. This is useful for database administration, debugging, database migration […]
Log configuration controls how logs look (format), where they go (console, files), and how much is shown (levels). Spring Boot offers two ways: simple application.properties settings, or a full Logback file named logback-spring.xml. The XML file gives complete control over appenders, rolling rules, filters, and different settings per profile (dev or prod). It is used
File logging writes application log messages to a file on disk instead of only showing them in the console. Console output disappears when the app restarts or the terminal closes, but a log file persists and can be searched later. In Spring Boot you enable it with logging.file.name or logging.file.path in application.properties. A rolling policy
Log levels classify each log message by its importance, so you can tell a routine event from a serious failure. Spring Boot (Logback) supports TRACE, DEBUG, INFO, WARN, and ERROR, from least to most severe. Choosing the right level keeps production logs clean (only INFO and above) while still allowing detailed DEBUG output when troubleshooting.
File logging writes application log messages to a file on disk instead of only showing them in the console. Console output disappears when the app restarts or the terminal closes, but a log file persists and can be searched later. In Spring Boot you enable it with logging.file.name or logging.file.path in application.properties. A rolling policy
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DatabaseMetaData is a JDBC interface used to obtain information about the database, JDBC driver, tables, columns, and supported database features. It is obtained from a Connection object using the getMetaData() method. Using DatabaseMetaData, a Java program can dynamically inspect database information without directly querying system tables. This is useful for database administration, debugging, database migration
An email attachment is a file (report, PDF, image, document) sent along with the email message. In Spring Boot you create a multipart MimeMessage with MimeMessageHelper and add files using addAttachment(). The file can come from disk, from a database, or be generated in memory as a ByteArrayResource. It is used for reports, invoices, certificates,
An HTML email is a message whose body uses HTML tags and inline CSS, so it can show headings, tables, colors, and branding instead of plain text. In Spring Boot you build it with MimeMessage and MimeMessageHelper from the same JavaMailSender used in 12.1. Passing true as the HTML flag tells the mail client to
SMTP (Simple Mail Transfer Protocol) is the standard protocol applications use to send email through a mail server. Spring Boot connects to an SMTP server using the spring-boot-starter-mail dependency and spring.mail.* properties. It auto-creates a JavaMailSender bean, so you can send emails without writing any connection code. It is used for registration confirmations, password resets,
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DatabaseMetaData is a JDBC interface used to obtain information about the database, JDBC driver, tables, columns, and supported database features. It is obtained from a Connection object using the getMetaData() method. Using DatabaseMetaData, a Java program can dynamically inspect database information without directly querying system tables. This is useful for database administration, debugging, database migration
