What is the lifecycle of a servlet?

August 08, 2025

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In Java JDBC, SQL-related errors are represented by the SQLException class. Handling them properly ensures smooth execution and better debugging.

1. Using try-catch block

Wrap database code in a try block and catch SQLException to handle errors:

java
try {
    Connection con = DriverManager.getConnection(url, user, pass);
    Statement stmt = con.createStatement();
    ResultSet rs = stmt.executeQuery("SELECT * FROM users");
} catch (SQLException e) {
    System.out.println("Error: " + e.getMessage());
}

2. Get detailed error info

SQLException provides:

getMessage() → Error description
getSQLState() → SQL state code
getErrorCode() → Database-specific code

3. Handling multiple exceptions

Use multiple catch blocks if mixing SQLException with other exceptions:

java
catch (SQLException e) { ... }
catch (Exception e) { ... }

4. Finally block for cleanup

Always close Connection, Statement, and ResultSet in finally to avoid resource leaks:

java
finally {
    if (rs != null) rs.close();
    if (stmt != null) stmt.close();
    if (con != null) con.close();
}

5. Best Practices

Log the error for debugging.
Show user-friendly messages instead of raw SQL errors.
Use try-with-resources to auto-close connections.

In short, handle SQLException with proper logging, cleanup, and safe error messages to make applications robust.

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