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WalkthroughAdds JDBC repository interfaces and implementations, a DataSource abstraction with a DriverManager-backed implementation, refactors Main to use these components with environment-configured DB access and interactive login/menu operations, and adds the Maven dependency org.slf4j:slf4j-nop:2.0.17. Changes
Sequence DiagramsequenceDiagram
participant User
participant Main
participant AccountRepo as AccountRepository
participant MoonRepo as MoonMissionRepository
participant DS as DataSource
participant DB as Database
User->>Main: start app
Main->>DS: init SimpleDriverManagerDataSource (env vars)
Main->>DB: test connection
Main->>User: prompt username/password
User->>Main: submit credentials
Main->>AccountRepo: findByNameAndPassword(username, password)
AccountRepo->>DS: getConnection()
DS->>DB: open connection
AccountRepo->>DB: SELECT user_id WHERE username=? AND password=?
DB-->>AccountRepo: result
AccountRepo-->>Main: auth result
alt authenticated
Main->>User: show menu
User->>Main: choose action
alt list missions
Main->>MoonRepo: findAllSpacecraftNames()
MoonRepo->>DS: getConnection()
DS->>DB: open connection
MoonRepo->>DB: SELECT spacecraft FROM moon_mission
DB-->>MoonRepo: rows
MoonRepo-->>Main: names
Main->>User: display
else get mission by id
Main->>DS: getConnection()
Main->>MoonRepo: findMissionById(id, connection)
MoonRepo->>DB: SELECT * FROM moon_mission WHERE mission_id=?
DB-->>MoonRepo: row (ResultSet)
MoonRepo-->>Main: result
Main->>User: display
else account create/update/delete
Main->>AccountRepo: create/updatePassword/delete(...)
AccountRepo->>DS: getConnection()
DS->>DB: open connection
AccountRepo->>DB: INSERT/UPDATE/DELETE
DB-->>AccountRepo: update count
AccountRepo-->>Main: result
Main->>User: confirm
end
else authentication failed
Main->>User: show failure
end
Estimated code review effort🎯 4 (Complex) | ⏱️ ~60 minutes
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Pre-merge checks and finishing touches❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
✨ Finishing touches
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Actionable comments posted: 5
🧹 Nitpick comments (4)
pom.xml (1)
49-58: Consider adding<scope>test</scope>to test-only dependencies.The
testcontainers:mysqldependency (lines 49-53) andslf4j-nop(lines 54-58) appear to be used only during development/testing viaDevDatabaseInitializer. Without a<scope>test</scope>, these will be bundled in the production artifact.<dependency> <groupId>org.testcontainers</groupId> <artifactId>mysql</artifactId> <version>1.21.3</version> + <scope>test</scope> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-nop</artifactId> <version>2.0.17</version> + <scope>test</scope> </dependency>src/main/java/com/example/MoonMissionRepository.java (1)
8-11: ReturningResultSetfrom repository breaks the abstraction.
findMissionByIdreturns aResultSetand requires the caller to pass aConnection, leaking JDBC internals. This creates lifecycle management issues—theResultSetis tied to thePreparedStatementwhich isn't closed in the implementation (seeJdbcMoonMissionRepository).Consider returning a domain object (e.g.,
Optional<MoonMission>) and managing the connection internally:// Example domain object public record MoonMission(long missionId, String spacecraft, LocalDate launchDate, String outcome) {} // Revised interface method Optional<MoonMission> findMissionById(long missionId) throws SQLException;src/main/java/com/example/JdbcAccountRepository.java (2)
31-43: Handle sensitive PII and consider returning generated keys from insertsTwo points about
create:
ssnandpassword(or password hash) are very sensitive fields. If these are real values, consider:
- Storing only password hashes, never raw passwords.
- Encrypting or otherwise protecting SSNs at rest, and minimizing where they are read in the codebase.
- The method returns only
executeUpdate()(rows affected). If callers need the newuser_id, it might be more ergonomic to request generated keys (prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)+getGeneratedKeys()) or use aRETURNINGclause if your DB supports it.If you don’t need the ID or this is just for a lab exercise, the current implementation is functionally fine.
46-66: Optional: reduce duplication and make update/delete semantics explicit
updatePasswordanddeleteare straightforward and correct, but you might consider:
- Checking the returned
intand documenting the expected value (e.g. “returns 1 if a row was updated/deleted, 0 if no such user exists”) so callers know how to handle “user not found”.- Extracting a small private helper for simple
UPDATE/DELETEstatements to avoid repeating the same try-with-resources pattern if you add more similar methods later.Not required, but would improve clarity and reduce future duplication.
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📒 Files selected for processing (8)
pom.xml(1 hunks)src/main/java/com/example/AccountRepository.java(1 hunks)src/main/java/com/example/DataSource.java(1 hunks)src/main/java/com/example/JdbcAccountRepository.java(1 hunks)src/main/java/com/example/JdbcMoonMissionRepository.java(1 hunks)src/main/java/com/example/Main.java(2 hunks)src/main/java/com/example/MoonMissionRepository.java(1 hunks)src/main/java/com/example/SimpleDriverManagerDataSource.java(1 hunks)
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src/main/java/com/example/Main.java (1)
src/main/java/com/example/DevDatabaseInitializer.java (1)
DevDatabaseInitializer(6-24)
🔇 Additional comments (8)
src/main/java/com/example/DataSource.java (1)
6-8: LGTM - Simple DataSource abstraction.The interface cleanly abstracts connection provisioning. For broader compatibility (e.g., connection pooling libraries), consider extending or replacing with
javax.sql.DataSource, but this custom interface works well for the current scope.src/main/java/com/example/AccountRepository.java (1)
5-10: LGTM - Clean repository interface.The interface follows standard repository conventions. Minor consideration:
findByNameAndPasswordreturningbooleanlimits flexibility—returningOptional<Account>would allow retrieving user details upon successful authentication.src/main/java/com/example/SimpleDriverManagerDataSource.java (1)
7-23: LGTM - Simple DataSource implementation.The implementation correctly delegates to
DriverManager. Creating a new connection per call is fine for low-traffic scenarios. For production workloads, consider a connection pool (e.g., HikariCP) to avoid connection overhead.src/main/java/com/example/JdbcMoonMissionRepository.java (2)
19-31: LGTM - Proper resource management.Good use of try-with-resources for
Connection,Statement, andResultSet.
42-55: LGTM - Proper resource management.Good use of nested try-with-resources for connection, statement, and result set.
src/main/java/com/example/Main.java (2)
23-59: LGTM - Repository initialization and connection test.Good separation of concerns with configuration resolution and repository pattern setup. The connection test (lines 45-47) validates database connectivity before proceeding.
87-129: LGTM - Menu loop with proper exception handling.Good handling of
InputMismatchExceptionwith scanner reset (line 124) andSQLExceptionlogging. The switch-based menu is clear and maintainable.src/main/java/com/example/JdbcAccountRepository.java (1)
8-14: Good use of constructor injection and DataSource abstractionUsing a
final DataSourcewith constructor injection keeps the repository easy to test and swap implementations, and centralizes connection configuration nicely. Nothing to change here.
| @Override | ||
| public boolean findByNameAndPassword(String username, String password) throws SQLException { | ||
| String sql = "SELECT user_id FROM account WHERE name = ? AND password = ?"; | ||
| // Använder try-with-resources för att säkerställa att Connection stängs | ||
| try (Connection connection = dataSource.getConnection(); | ||
| PreparedStatement stmt = connection.prepareStatement(sql)) { | ||
| stmt.setString(1, username); | ||
| stmt.setString(2, password); | ||
| try (ResultSet rs = stmt.executeQuery()) { | ||
| return rs.next(); | ||
| } | ||
| } | ||
| } |
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Store and compare password hashes, not plaintext values; enforce unique constraint on name column
-
Password hashing: The codebase stores and compares passwords as plaintext (no bcrypt, argon2, or similar in dependencies). Passwords are inserted directly in
create()and compared directly infindByNameAndPassword(). This is a critical security vulnerability. Before any password reaches the repository, hash and salt it (e.g., using Spring Security'sBCryptPasswordEncoderor similar), and store only the hash. UpdatefindByNameAndPassword()to accept a hashed password or implement a separate verification method that hashes the input before comparison. At minimum, rename thepasswordparameter and column topasswordHashto signal that hashed values are expected. -
Name column uniqueness: The schema (
init.sql) definesnameasVARCHAR(255)with noUNIQUEconstraint. Multiple users can have identical names, and login would succeed for any matching account without indication of duplicates. Add aUNIQUEconstraint to thenamecolumn at the database level:ALTER TABLE account ADD UNIQUE (name);
| @Override | ||
| public ResultSet findMissionById(long missionId, Connection connection) throws SQLException { | ||
| String sql = "SELECT * FROM moon_mission WHERE mission_id = ?"; | ||
| PreparedStatement stmt = connection.prepareStatement(sql); | ||
| stmt.setLong(1, missionId); | ||
| return stmt.executeQuery(); | ||
| } |
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Resource leak: PreparedStatement is never closed.
The PreparedStatement created on line 37 is not managed by try-with-resources. When the caller closes the ResultSet, the statement remains open, leading to resource exhaustion over time.
This is another reason to avoid returning ResultSet. Refactor to return a domain object:
- @Override
- public ResultSet findMissionById(long missionId, Connection connection) throws SQLException {
- String sql = "SELECT * FROM moon_mission WHERE mission_id = ?";
- PreparedStatement stmt = connection.prepareStatement(sql);
- stmt.setLong(1, missionId);
- return stmt.executeQuery();
- }
+ @Override
+ public Optional<MoonMission> findMissionById(long missionId) throws SQLException {
+ String sql = "SELECT * FROM moon_mission WHERE mission_id = ?";
+ try (Connection connection = dataSource.getConnection();
+ PreparedStatement stmt = connection.prepareStatement(sql)) {
+ stmt.setLong(1, missionId);
+ try (ResultSet rs = stmt.executeQuery()) {
+ if (rs.next()) {
+ return Optional.of(new MoonMission(
+ rs.getLong("mission_id"),
+ rs.getString("spacecraft"),
+ rs.getDate("launch_date").toLocalDate(),
+ rs.getString("outcome")
+ ));
+ }
+ return Optional.empty();
+ }
+ }
+ }Committable suggestion skipped: line range outside the PR's diff.
🤖 Prompt for AI Agents
In src/main/java/com/example/JdbcMoonMissionRepository.java around lines 34 to
40, the PreparedStatement created for the query is never closed and the method
returns a ResultSet (causing the statement to remain open); change the method to
not return ResultSet but instead use try-with-resources to open the
PreparedStatement and ResultSet, map the single-row result to a MoonMission
domain object (or Optional<MoonMission>) and return that, ensuring both
ResultSet and PreparedStatement are closed automatically; update method
signature and callers accordingly (or if you cannot change callers, document and
close the statement before returning by wrapping ResultSet consumption inside
the method and returning a materialized object).
| private boolean login() throws SQLException { | ||
| System.out.print("Username: "); | ||
| String username = scanner.nextLine(); | ||
| System.out.print("Password: "); | ||
| String password = scanner.nextLine(); | ||
|
|
||
| // Använder AccountRepository | ||
| return accountRepository.findByNameAndPassword(username, password); | ||
| } |
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Implement password hashing for all password operations.
Passwords are stored and compared in plaintext across all methods in JdbcAccountRepository. The findByNameAndPassword() method compares passwords directly in the SQL query (WHERE password = ?), and both create() and updatePassword() methods store passwords without hashing. This violates security best practices and exposes user credentials. Implement proper password hashing using bcrypt (or similar) before storing and when authenticating users.
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Actionable comments posted: 0
♻️ Duplicate comments (5)
src/main/java/com/example/Main.java (5)
63-71: Plaintext password handling remains unaddressed.The password security concern flagged in the previous review is still present - passwords are stored and compared in plaintext.
181-189:InputMismatchExceptionhandling still missing.As noted in the previous review,
scanner.nextInt()on line 183 can throwInputMismatchExceptionfor non-numeric input. While the exception will propagate tomainMenu()which handles it, adding local handling would provide a more specific error message.
221-235:InputMismatchExceptionhandling still missing.
scanner.nextLong()on line 223 lacks the same try-catch handling that was added togetMoonMissionById.
237-251:InputMismatchExceptionhandling still missing.
scanner.nextLong()on line 240 lacks the same try-catch handling that was added togetMoonMissionById.
158-164: Missingscanner.nextLine()in catch block leaves invalid input in buffer.When
InputMismatchExceptionis thrown,nextLong()does not consume the invalid token. Returning without clearing the buffer causes the nextscanner.nextInt()call inmainMenu()to immediately fail with the same invalid input.}catch (InputMismatchException e){ + scanner.nextLine(); // Clear invalid input from buffer System.out.println("Please enter a number"); return; }
🧹 Nitpick comments (1)
src/main/java/com/example/Main.java (1)
166-177: ReturningResultSetfrom repository method is an anti-pattern.
ResultSetis tied toStatementandConnectionlifecycle. When theConnectioncloses (via try-with-resources), behavior depends on how the repository manages theStatement. This leaks JDBC implementation details and complicates resource management.Consider returning a domain object or
Optional<MoonMission>from the repository instead:// In repository: Optional<MoonMission> findMissionById(long missionId); // In Main: moonMissionRepository.findMissionById(missionId).ifPresentOrElse( mission -> { System.out.println("Spacecraft: " + mission.getSpacecraft()); // ... }, () -> System.out.println("Mission not found.") );
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src/main/java/com/example/Main.java(2 hunks)
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src/main/java/com/example/Main.java (1)
src/main/java/com/example/DevDatabaseInitializer.java (1)
DevDatabaseInitializer(6-24)
🔇 Additional comments (3)
src/main/java/com/example/Main.java (3)
23-59: Good implementation of configuration and initialization flow.The configuration resolution with fallback from system properties to environment variables, null validation, and connection test before proceeding is well-structured. The repository pattern initialization cleanly separates concerns.
87-129: Well-structured menu loop with proper error handling.The centralized
InputMismatchExceptionandSQLExceptionhandling in the main menu loop ensures graceful recovery from both input errors and database failures.
202-208: Empty username validation implemented correctly.The check for empty username addresses the edge case where both names could be empty, with a clear user message.
|
Note Docstrings generation - SUCCESS |
Docstrings generation was requested by @johanbriger. * #3 (comment) The following files were modified: * `src/main/java/com/example/AccountRepository.java` * `src/main/java/com/example/DataSource.java` * `src/main/java/com/example/JdbcAccountRepository.java` * `src/main/java/com/example/JdbcMoonMissionRepository.java` * `src/main/java/com/example/Main.java` * `src/main/java/com/example/MoonMissionRepository.java` * `src/main/java/com/example/SimpleDriverManagerDataSource.java`
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