Von Dr. Cassian Holt, Senior Architect & Programming Language Historian bei Java Fleet Systems Consulting in Essen-Rüttenscheid
🔗 Bisher in der Testing-Time-Travel-Serie:
- Teil 1: Die Evolution des Testens – JUnit 3→4→5 Geschichte, Testing-Basics
- Teil 2: Die Wissenschaft der Test-Pyramide – Unit/Integration/E2E als Physik
- Teil 3: Property-Based Testing & TDD-Kulturschock – jqwik + Entwicklungs-Revolution
- Teil 4: Mocking & Test Doubles – Die Kunst der Fake-Objekte
Heute: Teil 5 – Security-Testing & Chaos Engineering an Nova’s TaskApp
⚡ Kurze Zusammenfassung – Das Wichtigste in 30 Sekunden
🔒 Nova’s TaskApp Security-Tests:
- OWASP Top 10 gegen die TaskApp-API testen
- Task-Authentication und Authorization absichern
- Property-Based Security Testing für Task-Inputs
🌪️ TaskApp Chaos Engineering:
- Circuit Breaker für External-Services (Email, Payment)
- Chaos Testing der Task-Database-Connection
- Resilience unter High-Load Task-Creation
🎯 Diese Woche: Nova’s TaskApp wird Production-Ready Security- und Chaos-geprüft!
🦾 Code Sentinel greift Nova’s TaskApp an: „Zeit für den echten Test!“
Dr. Cassian hier – und heute wird’s ernst! 🎉
Code Sentinel kam gestern zu mir: „Cassian, Nova’s TaskApp ist jetzt schön getestet mit Mocks und Properties. Aber kann sie einem echten Angriff standhalten? Zeit, ihre App richtig zu testen!“
Nova’s schockierte Reaktion: „Warte… meine TaskApp angreifen?! Ich dachte, wir sind Freunde!“ 😰
Code Sentinel grinsend: „Security-Testing IST Freundschaft! Besser ich finde die Bugs jetzt als ein echter Angreifer später. Los geht’s mit OWASP Top 10 gegen deine Task-API!“ 😈
Die Mission: Nova’s TaskApp von einem harmlosen Todo-Manager zu einer Production-Ready, sicheren, resilienten Anwendung machen!
🔒 Security-Testing: Nova’s TaskApp unter OWASP-Beschuss
📋 Nova’s TaskApp – Current State Review:
// Nova's TaskApp - Was wir bisher haben:
@RestController
@RequestMapping("/api/tasks")
public class TaskController {
@GetMapping
public List<Task> getAllTasks() { /* ... */ }
@PostMapping
public Task createTask(@RequestBody CreateTaskRequest request) { /* ... */ }
@GetMapping("/{id}")
public Task getTaskById(@PathVariable Long id) { /* ... */ }
@DeleteMapping("/{id}")
public void deleteTask(@PathVariable Long id) { /* ... */ }
@GetMapping("/search")
public List<Task> searchTasks(@RequestParam String query) { /* ... */ }
}
// Domain Model
@Entity
public class Task {
private Long id;
private String title;
private String description;
private TaskStatus status;
private LocalDateTime createdAt;
private Long userId; // Wem gehört der Task?
}
🎯 OWASP Top 10 (2023) vs. Nova’s TaskApp
@SpringBootTest
@AutoConfigureTestDatabase
@DisplayName("🔒 Nova's TaskApp Security Test Suite")
class NovaTaskAppSecurityTest {
@Autowired
private MockMvc mockMvc;
@Autowired
private TaskRepository taskRepository;
@MockBean // Unser Mocking-Wissen aus Teil 4!
private EmailService emailService;
@MockBean
private PaymentService paymentService;
// OWASP #1: Broken Access Control - Nova's häufigster Fehler!
@Test
@WithMockUser(username = "alice", roles = "USER")
@DisplayName("🔒 A01 - Alice should NOT access Bob's tasks")
void shouldPreventAccessToOtherUsersTasks() throws Exception {
// Arrange: Bob erstellt einen privaten Task
Task bobsTask = createTaskForUser("bob", "Bob's Secret Project", "Very confidential");
// Act & Assert: Alice versucht Bob's Task zu lesen
mockMvc.perform(get("/api/tasks/" + bobsTask.getId()))
.andExpect(status().isForbidden())
.andExpected(jsonPath("$.error").value("Access denied"))
.andExpected(jsonPath("$.message").value("You can only access your own tasks"));
// Alice versucht Bob's Task zu löschen
mockMvc.perform(delete("/api/tasks/" + bobsTask.getId()))
.andExpected(status().isForbidden());
// Alice versucht Bob's Task zu modifizieren
mockMvc.perform(put("/api/tasks/" + bobsTask.getId())
.contentType(MediaType.APPLICATION_JSON)
.content("{\"title\":\"Alice hacked this!\"}"))
.andExpected(status().isForbidden());
// Paranoid Check: Bob's Task ist unverändert
Task stillBobsTask = taskRepository.findById(bobsTask.getId()).orElseThrow();
assertThat(stillBobsTask.getTitle()).isEqualTo("Bob's Secret Project");
assertThat(stillBobsTask.getUserId()).isEqualTo(findUserId("bob"));
}
// OWASP #2: Cryptographic Failures - Nova's User-Passwords
@Test
@DisplayName("🔒 A02 - TaskApp user passwords must be properly hashed")
void shouldHashUserPasswordsProperly() throws Exception {
// Arrange: Nova registriert neuen User
CreateUserRequest request = CreateUserRequest.builder()
.username("nova")
.email("nova@javafleet.com")
.password("MySecretPassword123!")
.build();
// Act: User-Registration über TaskApp
mockMvc.perform(post("/api/users/register")
.contentType(MediaType.APPLICATION_JSON)
.content(objectMapper.writeValueAsString(request)))
.andExpect(status().isCreated());
// Assert: Password ist verschlüsselt in Database
Optional<User> savedUser = userRepository.findByUsername("nova");
assertThat(savedUser).isPresent();
User nova = savedUser.get();
assertThat(nova.getPassword())
.as("Nova's password must be hashed, not plaintext")
.doesNotContain("MySecretPassword123!")
.startsWith("$2a$") // BCrypt Hash
.hasSize(60); // BCrypt Hash Length
// Verify: Login funktioniert trotz Hashing
LoginRequest loginRequest = new LoginRequest("nova", "MySecretPassword123!");
mockMvc.perform(post("/api/auth/login")
.contentType(MediaType.APPLICATION_JSON)
.content(objectMapper.writeValueAsString(loginRequest)))
.andExpected(status().isOk())
.andExpected(jsonPath("$.token").exists())
.andExpected(jsonPath("$.username").value("nova"));
}
// OWASP #3: Injection Attacks - Nova's Task-Search ist gefährdet!
@Test
@WithMockUser(username = "nova", roles = "USER")
@DisplayName("🔒 A03 - TaskApp search should prevent SQL Injection")
void shouldPreventSqlInjectionInTaskSearch() throws Exception {
// Arrange: Nova hat einige normale Tasks
createTaskForUser("nova", "Buy groceries", "Milk, Bread, Eggs");
createTaskForUser("nova", "Finish project", "Complete the TaskApp");
// Bösartige SQL-Injection-Versuche gegen Task-Search
List<String> maliciousQueries = List.of(
"'; DROP TABLE tasks; --",
"' OR '1'='1",
"'; INSERT INTO tasks (title) VALUES ('HACKED'); --",
"UNION SELECT password FROM users WHERE '1'='1",
"'; UPDATE tasks SET title='PWNED' WHERE user_id=1; --",
"' OR 1=1 ORDER BY id DESC --"
);
for (String maliciousQuery : maliciousQueries) {
// Act: Injection-Versuch über Task-Search
mockMvc.perform(get("/api/tasks/search")
.param("query", maliciousQuery))
.andExpected(status().isBadRequest()) // Input validation blocks it
.andExpected(jsonPath("$.error").value("Invalid search query"))
.andExpected(content().string(not(containsString("password"))))
.andExpected(content().string(not(containsString("HACKED"))))
.andExpected(content().string(not(containsString("PWNED"))));
}
// Paranoid Check: Nova's Tasks sind unverändert
List<Task> novasTasks = taskRepository.findByUserId(findUserId("nova"));
assertThat(novasTasks)
.hasSize(2)
.extracting(Task::getTitle)
.containsExactlyInAnyOrder("Buy groceries", "Finish project")
.doesNotContain("HACKED", "PWNED");
// Database ist noch intakt
assertThat(taskRepository.count()).isEqualTo(2);
assertThat(userRepository.count()).isGreaterThan(0);
}
// OWASP #4: Insecure Design - Nova's Task-Creation Rate Limiting
@Test
@WithMockUser(username = "nova", roles = "USER")
@DisplayName("🔒 A04 - TaskApp should rate-limit task creation")
void shouldRateLimitTaskCreation() throws Exception {
// Simulate: Nova versucht 20 Tasks in 10 Sekunden zu erstellen (Spam-Attack)
List<CompletableFuture<MvcResult>> futures = new ArrayList<>();
for (int i = 0; i < 20; i++) {
final int taskNumber = i;
CompletableFuture<MvcResult> future = CompletableFuture.supplyAsync(() -> {
try {
CreateTaskRequest request = CreateTaskRequest.builder()
.title("Spam Task " + taskNumber)
.description("This is spam task number " + taskNumber)
.build();
return mockMvc.perform(post("/api/tasks")
.contentType(MediaType.APPLICATION_JSON)
.content(objectMapper.writeValueAsString(request)))
.andReturn();
} catch (Exception e) {
throw new RuntimeException(e);
}
});
futures.add(future);
}
// Collect results
List<MvcResult> results = futures.stream()
.map(CompletableFuture::join)
.collect(Collectors.toList());
// Assert: Rate Limiting greift
long successfulCreations = results.stream()
.filter(result -> result.getResponse().getStatus() == 201)
.count();
long rateLimitedRequests = results.stream()
.filter(result -> result.getResponse().getStatus() == 429)
.count();
assertThat(successfulCreations)
.as("Only limited number of tasks should be created")
.isBetween(5L, 10L); // Rate limit allows max 10 per minute
assertThat(rateLimitedRequests)
.as("Excessive requests should be rate limited")
.isGreaterThan(10L);
// Database sollte nicht überlastet sein
assertThat(taskRepository.countByUserId(findUserId("nova")))
.as("Database should not be spammed")
.isLessThan(12);
}
// OWASP #5: Security Misconfiguration - Nova's Development-Endpoints
@Test
@DisplayName("🔒 A05 - TaskApp should not expose sensitive endpoints in production")
void shouldNotExposeSensitiveEndpoints() throws Exception {
// Diese Endpoints dürfen NICHT in Production erreichbar sein
List<String> sensitiveEndpoints = List.of(
"/actuator/env", // Environment variables
"/actuator/configprops", // Configuration properties
"/h2-console", // H2 Database console
"/swagger-ui.html", // API documentation
"/actuator/heapdump", // Memory dump
"/actuator/logfile", // Log files
"/debug/tasks", // Nova's Debug-Endpoint (vergessen zu entfernen!)
"/admin/reset-all" // Dangerous admin endpoint
);
for (String endpoint : sensitiveEndpoints) {
mockMvc.perform(get(endpoint))
.andExpected(anyOf(
status().isNotFound(), // Endpoint disabled
status().isUnauthorized(), // Requires auth
status().isForbidden() // Access denied
))
.andExpected(content().string(not(containsString("password"))))
.andExpected(content().string(not(containsString("secret"))))
.andExpected(content().string(not(containsString("api-key"))));
}
}
// OWASP #10: Server-Side Request Forgery (SSRF) - Nova's Task-Import
@Test
@WithMockUser(username = "nova", roles = "USER")
@DisplayName("🔒 A10 - TaskApp should prevent SSRF in task import")
void shouldPreventSSRFInTaskImport() throws Exception {
// Nova hat ein Feature: Tasks von URL importieren
List<String> maliciousUrls = List.of(
"http://localhost:8080/actuator/env", // Internal endpoint access
"file:///etc/passwd", // Local file access
"http://169.254.169.254/metadata", // AWS metadata service
"http://internal-admin:8080/users", // Internal service access
"ftp://internal-server/sensitive-data" // FTP access
);
for (String maliciousUrl : maliciousUrls) {
ImportTasksRequest request = ImportTasksRequest.builder()
.sourceUrl(maliciousUrl)
.format("json")
.build();
mockMvc.perform(post("/api/tasks/import")
.contentType(MediaType.APPLICATION_JSON)
.content(objectMapper.writeValueAsString(request)))
.andExpected(status().isBadRequest())
.andExpected(jsonPath("$.error").value("Invalid or unsafe URL"))
.andExpected(content().string(not(containsString("root:"))))
.andExpected(content().string(not(containsString("aws"))))
.andExpected(content().string(not(containsString("internal"))));
}
}
}
🔥 Property-Based Security Testing für Nova’s TaskApp
class NovaTaskAppPropertySecurityTest {
@Property
@DisplayName("🔒 All task titles should be XSS-safe")
void allTaskTitlesShouldBeXSSSafe(@ForAll("xssPayloads") String xssTitle) {
// Property: Keine Task-Title soll XSS-Code enthalten können
CreateTaskRequest request = CreateTaskRequest.builder()
.title(xssTitle)
.description("Innocent description")
.build();
if (taskInputValidator.isValid(request)) {
Task sanitizedTask = taskService.createTask(request);
// XSS-gefährliche Patterns wurden bereinigt
assertThat(sanitizedTask.getTitle())
.as("Task title should be XSS-safe")
.doesNotContain("<script")
.doesNotContain("javascript:")
.doesNotContain("onload=")
.doesNotContain("onerror=")
.doesNotMatch(".*[<>\"'&].*");
// HTML-Template-Rendering ist sicher
String renderedHtml = taskTemplateEngine.renderTaskCard(sanitizedTask);
assertThat(renderedHtml)
.as("Rendered HTML should not contain executable XSS")
.doesNotContain("<script>alert")
.doesNotContain("javascript:alert");
}
}
@Property
@DisplayName("🔒 Task search should be consistent and safe")
void taskSearchShouldBeConsistentAndSafe(
@ForAll("searchQueries") String searchQuery,
@ForAll("userIds") Long userId) {
// Property: Task-Search sollte immer sicher und konsistent sein
try {
SearchTasksRequest request = SearchTasksRequest.builder()
.query(searchQuery)
.userId(userId)
.build();
List<Task> results = taskService.searchTasks(request);
// Sicherheits-Properties
if (results != null) {
// 1. Nie Tasks von anderen Usern zurückgeben
assertThat(results)
.as("Search should never return tasks from other users")
.allMatch(task -> task.getUserId().equals(userId));
// 2. Nie sensitive Daten in Search-Ergebnissen
results.forEach(task -> {
assertThat(task.getTitle())
.as("Search results should not contain sensitive data")
.doesNotContainIgnoringCase("password")
.doesNotContainIgnoringCase("secret")
.doesNotContainIgnoringCase("api-key");
});
// 3. Keine SQL-Error-Messages
String searchLog = taskService.getLastSearchLog();
if (searchLog != null) {
assertThat(searchLog)
.as("Search should not log SQL errors")
.doesNotContainIgnoringCase("ORA-")
.doesNotContainIgnoringCase("MySQL")
.doesNotContainIgnoringCase("syntax error");
}
}
} catch (InvalidSearchException e) {
// Exception ist OK - aber keine SQL-Details preisgeben
assertThat(e.getMessage())
.as("Exception messages should not contain sensitive details")
.doesNotContainIgnoringCase("table")
.doesNotContainIgnoringCase("column")
.doesNotContainIgnoringCase("database");
}
}
@Provide
Arbitrary<String> xssPayloads() {
return Arbitraries.oneOf(
// Classic XSS
Arbitraries.just("<script>alert('XSS in TaskApp!')</script>"),
Arbitraries.just("<img src=x onerror=alert('Nova got pwned!')>"),
Arbitraries.just("javascript:alert('TaskApp XSS')"),
// Nova's TaskApp specific XSS
Arbitraries.just("\"><script>fetch('/api/tasks').then(r=>r.json()).then(console.log)</script>"),
Arbitraries.just("<iframe src='javascript:fetch(\"/api/users\").then(console.log)'></iframe>"),
// Template Injection (falls Nova Thymeleaf/Freemarker nutzt)
Arbitraries.just("${7*7} Task Title"),
Arbitraries.just("#{taskService.deleteAllTasks()}"),
// Encoding Bypasses
Arbitraries.just("<script>alert('encoded XSS')</script>"),
Arbitraries.just("%3Cscript%3Ealert('URL encoded')%3C/script%3E")
);
}
@Provide
Arbitrary<String> searchQueries() {
return Arbitraries.oneOf(
// Normal searches
Arbitraries.strings().withCharRange('a', 'z').ofMinLength(3).ofMaxLength(20),
// SQL Injection attempts
Arbitraries.just("' OR 1=1 --"),
Arbitraries.just("'; DROP TABLE tasks; --"),
Arbitraries.just("' UNION SELECT * FROM users --"),
// NoSQL Injection (falls Nova MongoDB nutzt)
Arbitraries.just("'; db.tasks.drop(); //"),
Arbitraries.just("{'$ne': null}"),
// Special characters
Arbitraries.strings().withChars('\'', '"', ';', '-', '(', ')', '%')
);
}
@Provide
Arbitrary<Long> userIds() {
return Arbitraries.longs().between(1L, 1000L);
}
}
🌪️ Chaos Engineering: Nova’s TaskApp unter Extrembedingungen
🔥 Code Sentinel’s Chaos-Mission:
„Nova, deine TaskApp läuft schön in der Entwicklung. Aber was passiert wenn:“
- Der Email-Service für Task-Notifications versagt?
- Die Datenbank überlastet wird?
- Der Payment-Service für Premium-Features nicht antwortet?
„Zeit für Controlled Chaos – we break it before production does!“
🐒 Chaos Monkey vs. Nova’s TaskApp
// Maven Dependency für TaskApp Chaos Engineering
<dependency>
<groupId>de.codecentric</groupId>
<artifactId>chaos-monkey-spring-boot</artifactId>
<version>3.1.0</version>
<scope>test</scope>
</dependency>
@SpringBootTest
@EnableChaosMonkey
@DisplayName("🌪️ Nova's TaskApp Chaos Engineering Suite")
class NovaTaskAppChaosTest {
@Autowired
private TaskService taskService;
@MockBean // Mock externe Services für kontrolliertes Chaos
private EmailService emailService;
@MockBean
private PaymentService paymentService;
@MockBean
private NotificationService notificationService;
@Test
@DisplayName("🐒 TaskApp should survive email service chaos")
void taskAppShouldSurviveEmailServiceChaos() throws Exception {
// Arrange: Email-Service wird chaotisch
when(emailService.sendTaskCreatedEmail(anyString(), any(Task.class)))
.thenThrow(new EmailTimeoutException("Chaos Monkey email attack!"))
.thenThrow(new EmailServiceDownException("Email service crashed!"))
.thenReturn(EmailResult.success("EMAIL_123")) // Eventually recovers
.thenThrow(new EmailRateLimitException("Too many emails!"));
// Act: Nova erstellt mehrere Tasks trotz Email-Chaos
List<CreateTaskRequest> requests = List.of(
CreateTaskRequest.builder().title("Chaos Task 1").notifyByEmail(true).build(),
CreateTaskRequest.builder().title("Chaos Task 2").notifyByEmail(true).build(),
CreateTaskRequest.builder().title("Chaos Task 3").notifyByEmail(true).build(),
CreateTaskRequest.builder().title("Chaos Task 4").notifyByEmail(true).build()
);
List<TaskCreationResult> results = requests.stream()
.map(request -> taskService.createTaskWithNotification(request))
.collect(Collectors.toList());
// Assert: TaskApp überlebt Email-Chaos gracefully
assertThat(results)
.as("All tasks should be created despite email chaos")
.hasSize(4)
.allMatch(result -> result.getTask() != null)
.allMatch(result -> result.getTask().getId() != null);
// Tasks sind in Database, auch wenn Email versagt
assertThat(taskRepository.count()).isEqualTo(4);
// Email-Status zeigt Probleme, aber App läuft
long emailFailures = results.stream()
.filter(result -> result.getEmailStatus() == EmailStatus.FAILED)
.count();
assertThat(emailFailures)
.as("Some emails should fail due to chaos")
.isGreaterThan(2);
// Aber: App crashed NICHT
assertThat(results)
.as("App should remain operational")
.allMatch(result -> result.getSystemStatus() == SystemStatus.OPERATIONAL);
}
@Test
@DisplayName("🌪️ TaskApp should handle database connection chaos")
void taskAppShouldHandleDatabaseChaos() throws Exception {
// Simulate: Database wird langsam und unzuverlässig
// (Testcontainers mit Chaos Monkey Network Conditions)
List<CompletableFuture<TaskOperationResult>> futures = new ArrayList<>();
// 15 parallele Task-Operationen unter DB-Chaos
for (int i = 0; i < 15; i++) {
final int taskId = i;
CompletableFuture<TaskOperationResult> future = CompletableFuture.supplyAsync(() -> {
try {
// Mix verschiedener DB-Operations
if (taskId % 3 == 0) {
// Create Task
CreateTaskRequest request = CreateTaskRequest.builder()
.title("DB Chaos Task " + taskId)
.build();
Task task = taskService.createTask(request);
return TaskOperationResult.createSuccess(task);
} else if (taskId % 3 == 1) {
// Read Tasks
List<Task> tasks = taskService.getTasksForUser(findUserId("nova"));
return TaskOperationResult.readSuccess(tasks.size());
} else {
// Update Task (wenn vorhanden)
Optional<Task> existingTask = taskService.findAnyTaskForUser(findUserId("nova"));
if (existingTask.isPresent()) {
Task task = existingTask.get();
task.setTitle("Updated during chaos " + taskId);
Task updated = taskService.updateTask(task);
return TaskOperationResult.updateSuccess(updated);
} else {
return TaskOperationResult.noTaskFound();
}
}
} catch (DatabaseTimeoutException e) {
return TaskOperationResult.timeout();
} catch (DatabaseConnectionException e) {
return TaskOperationResult.connectionError();
} catch (Exception e) {
return TaskOperationResult.error(e.getMessage());
}
});
futures.add(future);
}
// Collect results with timeout
List<TaskOperationResult> results = futures.stream()
.map(future -> {
try {
return future.get(10, TimeUnit.SECONDS);
} catch (TimeoutException e) {
return TaskOperationResult.timeout();
} catch (Exception e) {
return TaskOperationResult.error(e.getMessage());
}
})
.collect(Collectors.toList());
// Assert: TaskApp zeigt Resilience
long successfulOps = results.stream()
.filter(TaskOperationResult::isSuccess)
.count();
assertThat(successfulOps)
.as("At least 60% of operations should succeed under DB chaos")
.isGreaterThanOrEqualTo(9); // 60% von 15
// Wichtig: Keine Data Corruption
List<Task> allTasks = taskRepository.findAll();
assertThat(allTasks)
.as("No corrupted tasks should exist")
.allMatch(task -> task.getTitle() != null)
.allMatch(task -> task.getId() != null)
.allMatch(task -> task.getUserId() != null);
// App sollte nicht komplett versagen
assertThat(results)
.as("At least some operations should work")
.anyMatch(TaskOperationResult::isSuccess);
}
}
@Data
@Builder
class TaskOperationResult {
private final TaskOperationType type;
private final boolean success;
private final Task task;
private final Integer count;
private final String error;
public static TaskOperationResult createSuccess(Task task) {
return TaskOperationResult.builder()
.type(TaskOperationType.CREATE)
.success(true)
.task(task)
.build();
}
public static TaskOperationResult readSuccess(int count) {
return TaskOperationResult.builder()
.type(TaskOperationType.READ)
.success(true)
.count(count)
.build();
}
public static TaskOperationResult timeout() {
return TaskOperationResult.builder()
.success(false)
.error("Timeout")
.build();
}
// ... weitere Factory-Methoden
}
⚡ Circuit Breaker für Nova’s External Services
// Nova's TaskApp mit Circuit Breaker für externe Services
@Service
@Slf4j
public class ResilientTaskNotificationService {
private final EmailService emailService;
private final NotificationService notificationService;
private final CircuitBreaker emailCircuitBreaker;
private final CircuitBreaker notificationCircuitBreaker;
public ResilientTaskNotificationService(EmailService emailService,
NotificationService notificationService) {
this.emailService = emailService;
this.notificationService = notificationService;
// Email Circuit Breaker - kritisch für Task-Notifications
this.emailCircuitBreaker = CircuitBreaker.ofDefaults("taskEmailService");
emailCircuitBreaker.getEventPublisher().onStateTransition(event ->
log.info("Email Circuit Breaker: {} -> {}",
event.getStateTransition().getFromState(),
event.getStateTransition().getToState())
);
// Push Notification Circuit Breaker - weniger kritisch
this.notificationCircuitBreaker = CircuitBreaker.ofDefaults("taskNotificationService");
}
public NotificationResult notifyTaskCreated(Task task, User user) {
NotificationResult.Builder result = NotificationResult.builder()
.taskId(task.getId())
.userId(user.getId());
// Email Notification (kritisch)
try {
EmailResult emailResult = emailCircuitBreaker.executeSupplier(() ->
emailService.sendTaskCreatedEmail(user.getEmail(), task)
);
result.emailStatus(emailResult.isSuccess() ? EmailStatus.SENT : EmailStatus.FAILED);
} catch (CallNotPermittedException e) {
log.warn("Email circuit breaker is OPEN - skipping email for task {}", task.getId());
result.emailStatus(EmailStatus.CIRCUIT_OPEN);
} catch (Exception e) {
log.error("Email notification failed for task {}", task.getId(), e);
result.emailStatus(EmailStatus.FAILED);
}
// Push Notification (nice-to-have)
try {
PushResult pushResult = notificationCircuitBreaker.executeSupplier(() ->
notificationService.sendPushNotification(user.getId(),
"New task created: " + task.getTitle())
);
result.pushStatus(pushResult.isSuccess() ? PushStatus.SENT : PushStatus.FAILED);
} catch (CallNotPermittedException e) {
log.info("Notification circuit breaker is OPEN - skipping push for task {}", task.getId());
result.pushStatus(PushStatus.CIRCUIT_OPEN);
} catch (Exception e) {
log.warn("Push notification failed for task {}", task.getId(), e);
result.pushStatus(PushStatus.FAILED);
}
return result.build();
}
public CircuitBreaker.State getEmailCircuitBreakerState() {
return emailCircuitBreaker.getState();
}
public CircuitBreaker.State getNotificationCircuitBreakerState() {
return notificationCircuitBreaker.getState();
}
}
// Circuit Breaker Testing für Nova's TaskApp
@SpringBootTest
class NovaTaskAppCircuitBreakerTest {
@MockBean
private EmailService emailService;
@MockBean
private NotificationService notificationService;
@Autowired
private ResilientTaskNotificationService notificationService;
@Test
@DisplayName("⚡ Email circuit breaker should protect TaskApp from email service failures")
void emailCircuitBreakerShouldProtectFromFailures() throws Exception {
// Arrange: Email service versagt 5x in Folge
Task testTask = createSampleTask("Test Circuit Breaker Task");
User testUser = createTestUser("nova");
when(emailService.sendTaskCreatedEmail(testUser.getEmail(), testTask))
.thenThrow(new EmailTimeoutException("Email service down"));
// Act: 5 Fehlgeschlagene Email-Versuche
for (int i = 0; i < 5; i++) {
NotificationResult result = notificationService.notifyTaskCreated(testTask, testUser);
assertThat(result.getEmailStatus()).isEqualTo(EmailStatus.FAILED);
}
// Assert: Circuit Breaker öffnet sich
assertThat(notificationService.getEmailCircuitBreakerState())
.isEqualTo(CircuitBreaker.State.OPEN);
// Weitere Versuche werden sofort blockiert (fail-fast)
NotificationResult blockedResult = notificationService.notifyTaskCreated(testTask, testUser);
assertThat(blockedResult.getEmailStatus()).isEqualTo(EmailStatus.CIRCUIT_OPEN);
// Verify: EmailService wird nicht mehr aufgerufen (fail-fast protection)
verify(emailService, times(5)).sendTaskCreatedEmail(any(), any());
// Push Notifications sollten weiterhin funktionieren
when(notificationService.sendPushNotification(testUser.getId(), anyString()))
.thenReturn(PushResult.success("PUSH_123"));
NotificationResult pushResult = notificationService.notifyTaskCreated(testTask, testUser);
assertThat(pushResult.getPushStatus()).isEqualTo(PushStatus.SENT);
}
@Test
@DisplayName("⚡ Circuit breaker should recover when email service is healthy again")
void circuitBreakerShouldRecoverWhenServiceHealthy() throws Exception {
Task testTask = createSampleTask("Recovery Test Task");
User testUser = createTestUser("nova");
// Phase 1: Email service fails → Circuit Breaker OPEN
when(emailService.sendTaskCreatedEmail(any(), any()))
.thenThrow(new EmailTimeoutException("Service down"));
for (int i = 0; i < 5; i++) {
notificationService.notifyTaskCreated(testTask, testUser);
}
assertThat(notificationService.getEmailCircuitBreakerState())
.isEqualTo(CircuitBreaker.State.OPEN);
// Phase 2: Wait for circuit breaker timeout (simulated)
Thread.sleep(6000); // Default timeout + buffer
// Phase 3: Email service ist wieder gesund
when(emailService.sendTaskCreatedEmail(testUser.getEmail(), testTask))
.thenReturn(EmailResult.success("EMAIL_RECOVERED"));
// Act: Erster Versuch nach Recovery → HALF_OPEN → SUCCESS → CLOSED
NotificationResult recoveredResult = notificationService.notifyTaskCreated(testTask, testUser);
// Assert: Service funktioniert wieder
assertThat(recoveredResult.getEmailStatus()).isEqualTo(EmailStatus.SENT);
assertThat(notificationService.getEmailCircuitBreakerState())
.isEqualTo(CircuitBreaker.State.CLOSED);
}
}
🏗️ Bulkhead Pattern für Nova’s TaskApp
// Nova's TaskApp mit separaten Thread-Pools (Bulkhead Pattern)
@Service
@Configuration
public class BulkheadTaskProcessingService {
// Separate Thread-Pools für verschiedene Task-Types
private final Executor normalTaskExecutor;
private final Executor priorityTaskExecutor;
private final Executor systemTaskExecutor;
@Bean("normalTaskExecutor")
public Executor normalTaskExecutor() {
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setCorePoolSize(5);
executor.setMaxPoolSize(10);
executor.setQueueCapacity(50);
executor.setThreadNamePrefix("NormalTask-");
executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
executor.initialize();
return executor;
}
@Bean("priorityTaskExecutor")
public Executor priorityTaskExecutor() {
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setCorePoolSize(3);
executor.setMaxPoolSize(5);
executor.setQueueCapacity(20);
executor.setThreadNamePrefix("PriorityTask-");
executor.initialize();
return executor;
}
@Bean("systemTaskExecutor")
public Executor systemTaskExecutor() {
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setCorePoolSize(2);
executor.setMaxPoolSize(3);
executor.setQueueCapacity(10);
executor.setThreadNamePrefix("SystemTask-");
executor.initialize();
return executor;
}
@Async("normalTaskExecutor")
public CompletableFuture<Task> processNormalTask(CreateTaskRequest request) {
log.info("Processing normal task: {} on thread: {}",
request.getTitle(), Thread.currentThread().getName());
// Simuliere normale Task-Verarbeitung
simulateProcessingTime(500, 1000); // 0.5-1 Sekunde
Task task = Task.builder()
.title(request.getTitle())
.description(request.getDescription())
.status(TaskStatus.COMPLETED)
.type(TaskType.NORMAL)
.processingThread(Thread.currentThread().getName())
.build();
return CompletableFuture.completedFuture(taskService.save(task));
}
@Async("priorityTaskExecutor")
public CompletableFuture<Task> processPriorityTask(CreateTaskRequest request) {
log.info("Processing priority task: {} on thread: {}",
request.getTitle(), Thread.currentThread().getName());
// Priority Tasks sind schneller verarbeitet
simulateProcessingTime(100, 300); // 0.1-0.3 Sekunden
Task task = Task.builder()
.title(request.getTitle())
.description(request.getDescription())
.status(TaskStatus.COMPLETED)
.type(TaskType.PRIORITY)
.priority(TaskPriority.HIGH)
.processingThread(Thread.currentThread().getName())
.build();
return CompletableFuture.completedFuture(taskService.save(task));
}
@Async("systemTaskExecutor")
public CompletableFuture<Task> processSystemTask(CreateTaskRequest request) {
log.info("Processing system task: {} on thread: {}",
request.getTitle(), Thread.currentThread().getName());
// System Tasks (Backup, Cleanup, etc.) können länger dauern
simulateProcessingTime(2000, 5000); // 2-5 Sekunden
Task task = Task.builder()
.title(request.getTitle())
.description(request.getDescription())
.status(TaskStatus.COMPLETED)
.type(TaskType.SYSTEM)
.processingThread(Thread.currentThread().getName())
.build();
return CompletableFuture.completedFuture(taskService.save(task));
}
private void simulateProcessingTime(int minMs, int maxMs) {
try {
int processingTime = ThreadLocalRandom.current().nextInt(minMs, maxMs + 1);
Thread.sleep(processingTime);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new TaskProcessingException("Processing interrupted", e);
}
}
}
// Bulkhead Pattern Testing
@SpringBootTest
class NovaTaskAppBulkheadTest {
@Autowired
private BulkheadTaskProcessingService bulkheadService;
@Test
@DisplayName("🏗️ Normal task overload should not affect priority tasks")
void normalTaskOverloadShouldNotAffectPriorityTasks() throws Exception {
// Arrange: Überlade normale Tasks (mehr als Thread-Pool-Kapazität)
List<CompletableFuture<Task>> normalTaskFutures = new ArrayList<>();
// Starte 30 langsame normale Tasks (Thread-Pool hat nur 10 max Threads + 50 Queue)
for (int i = 0; i < 30; i++) {
CreateTaskRequest slowRequest = CreateTaskRequest.builder()
.title("Slow Normal Task " + i)
.description("This task will take time to process")
.build();
CompletableFuture<Task> future = bulkheadService.processNormalTask(slowRequest);
normalTaskFutures.add(future);
}
// Act: Starte Priority Tasks während Normal-Task-Overload
long startTime = System.currentTimeMillis();
List<CompletableFuture<Task>> priorityFutures = new ArrayList<>();
for (int i = 0; i < 5; i++) {
CreateTaskRequest priorityRequest = CreateTaskRequest.builder()
.title("Priority Task " + i)
.description("This task should be fast")
.build();
CompletableFuture<Task> future = bulkheadService.processPriorityTask(priorityRequest);
priorityFutures.add(future);
}
// Assert: Priority Tasks sollten trotz Normal-Task-Overload schnell sein
CompletableFuture.allOf(priorityFutures.toArray(new CompletableFuture[0]))
.get(3, TimeUnit.SECONDS); // Max 3 Sekunden für alle Priority Tasks
long priorityProcessingTime = System.currentTimeMillis() - startTime;
assertThat(priorityProcessingTime)
.as("Priority tasks should not be affected by normal task overload")
.isLessThan(3000); // Unter 3 Sekunden
// Verify: Priority Tasks sind alle fertig
List<Task> completedPriorityTasks = priorityFutures.stream()
.map(CompletableFuture::join)
.collect(Collectors.toList());
assertThat(completedPriorityTasks)
.hasSize(5)
.allMatch(task -> task.getStatus() == TaskStatus.COMPLETED)
.allMatch(task -> task.getType() == TaskType.PRIORITY)
.allMatch(task -> task.getProcessingThread().startsWith("PriorityTask-"));
// Bulkhead funktioniert: Viele Normal Tasks warten noch
long pendingNormalTasks = normalTaskFutures.stream()
.filter(future -> !future.isDone())
.count();
assertThat(pendingNormalTasks)
.as("Many normal tasks should still be processing (separate thread pool)")
.isGreaterThan(15);
// Thread Isolation Check
Set<String> priorityThreads = completedPriorityTasks.stream()
.map(Task::getProcessingThread)
.collect(Collectors.toSet());
assertThat(priorityThreads)
.as("Priority tasks should use dedicated thread pool")
.allMatch(threadName -> threadName.startsWith("PriorityTask-"));
}
@Test
@DisplayName("🏗️ System task processing should be isolated from user tasks")
void systemTasksShouldBeIsolatedFromUserTasks() throws Exception {
// Arrange: Starte System Tasks (Backup, Cleanup, etc.)
List<CompletableFuture<Task>> systemTaskFutures = new ArrayList<>();
for (int i = 0; i < 5; i++) {
CreateTaskRequest systemRequest = CreateTaskRequest.builder()
.title("System Backup Task " + i)
.description("Heavy system operation")
.build();
CompletableFuture<Task> future = bulkheadService.processSystemTask(systemRequest);
systemTaskFutures.add(future);
}
// Act: User Tasks parallel zu System Tasks
long startTime = System.currentTimeMillis();
List<CompletableFuture<Task>> userTaskFutures = new ArrayList<>();
for (int i = 0; i < 10; i++) {
CreateTaskRequest userRequest = CreateTaskRequest.builder()
.title("User Task " + i)
.description("Regular user task")
.build();
CompletableFuture<Task> future;
if (i < 5) {
future = bulkheadService.processNormalTask(userRequest);
} else {
future = bulkheadService.processPriorityTask(userRequest);
}
userTaskFutures.add(future);
}
// Assert: User Tasks sollten trotz System Task Load responsive sein
CompletableFuture.allOf(userTaskFutures.toArray(new CompletableFuture[0]))
.get(5, TimeUnit.SECONDS);
long userTaskProcessingTime = System.currentTimeMillis() - startTime;
assertThat(userTaskProcessingTime)
.as("User tasks should not be slowed down by system tasks")
.isLessThan(4000);
// System Tasks sollten noch laufen (sind langsamer)
long pendingSystemTasks = systemTaskFutures.stream()
.filter(future -> !future.isDone())
.count();
assertThat(pendingSystemTasks)
.as("System tasks should still be running (they take longer)")
.isGreaterThan(2);
// Thread Pool Isolation
List<Task> completedUserTasks = userTaskFutures.stream()
.map(CompletableFuture::join)
.collect(Collectors.toList());
Set<String> userThreads = completedUserTasks.stream()
.map(Task::getProcessingThread)
.collect(Collectors.toSet());
assertThat(userThreads)
.as("User tasks should use user thread pools, not system thread pool")
.allMatch(threadName ->
threadName.startsWith("NormalTask-") ||
threadName.startsWith("PriorityTask-"))
.noneMatch(threadName -> threadName.startsWith("SystemTask-"));
}
}
🎯 Integration: Security + Chaos für Nova’s Production-Ready TaskApp
🔥 Nova’s TaskApp Stress & Security Combined
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
@EnableChaosMonkey
class NovaTaskAppProductionReadinessTest {
@LocalServerPort
private int port;
@Autowired
private TestRestTemplate restTemplate;
@Test
@DisplayName("🚀🔒 TaskApp should maintain security under high concurrent load")
void taskAppShouldMaintainSecurityUnderLoad() throws Exception {
// Setup: 50 parallele Clients mit verschiedenen Auth-Status
ExecutorService executor = Executors.newFixedThreadPool(10);
List<Future<TaskAppLoadTestResult>> futures = new ArrayList<>();
// Mix aus verschiedenen User-Szenarien
for (int i = 0; i < 50; i++) {
final int clientId = i;
Future<TaskAppLoadTestResult> future = executor.submit(() -> {
try {
if (clientId % 4 == 0) {
// Authenticated Nova user
return performAuthenticatedTaskOperations(clientId, "nova");
} else if (clientId % 4 == 1) {
// Authenticated Alice user
return performAuthenticatedTaskOperations(clientId, "alice");
} else if (clientId % 4 == 2) {
// Unauthenticated attacker
return performUnauthenticatedAttacks(clientId);
} else {
// Malicious authenticated user (tries to access others' data)
return performCrossUserAttacks(clientId, "bob", "alice");
}
} catch (Exception e) {
return TaskAppLoadTestResult.error(clientId, e.getMessage());
}
});
futures.add(future);
}
// Collect results with timeout
List<TaskAppLoadTestResult> results = futures.stream()
.map(future -> {
try {
return future.get(30, TimeUnit.SECONDS);
} catch (TimeoutException e) {
return TaskAppLoadTestResult.timeout();
} catch (Exception e) {
return TaskAppLoadTestResult.error(-1, e.getMessage());
}
})
.collect(Collectors.toList());
executor.shutdown();
// Assert: Security bleibt konsistent unter Last
long authenticatedSuccess = results.stream()
.filter(r -> r.isAuthenticated() && r.isOperationSuccessful())
.count();
long unauthorizedBlocked = results.stream()
.filter(r -> !r.isAuthenticated() && r.getStatusCode() == 401)
.count();
long crossUserAttacksBlocked = results.stream()
.filter(r -> r.isCrossUserAttack() && r.getStatusCode() == 403)
.count();
assertThat(authenticatedSuccess)
.as("Legitimate authenticated operations should succeed under load")
.isGreaterThan(20);
assertThat(unauthorizedBlocked)
.as("Unauthorized requests should be consistently blocked")
.isGreaterThan(10);
assertThat(crossUserAttacksBlocked)
.as("Cross-user attacks should be blocked")
.isGreaterThan(10);
// KRITISCH: Keine Security-Bypasses unter Last!
long securityBypass = results.stream()
.filter(r -> !r.isAuthenticated() && r.isOperationSuccessful())
.count();
long dataLeakage = results.stream()
.filter(r -> r.isCrossUserAttack() && r.isOperationSuccessful())
.count();
assertThat(securityBypass)
.as("CRITICAL: No unauthenticated requests should succeed")
.isEqualTo(0);
assertThat(dataLeakage)
.as("CRITICAL: No cross-user data access should succeed")
.isEqualTo(0);
}
private TaskAppLoadTestResult performAuthenticatedTaskOperations(int clientId, String username) {
String token = createJwtToken(username);
HttpHeaders headers = new HttpHeaders();
headers.setBearerAuth(token);
try {
// Create Task
CreateTaskRequest createRequest = CreateTaskRequest.builder()
.title("Load Test Task " + clientId)
.description("Created by " + username)
.build();
ResponseEntity<Task> createResponse = restTemplate.exchange(
"/api/tasks",
HttpMethod.POST,
new HttpEntity<>(createRequest, headers),
Task.class
);
if (createResponse.getStatusCode() != HttpStatus.CREATED) {
return TaskAppLoadTestResult.failure(clientId, createResponse.getStatusCodeValue());
}
Task createdTask = createResponse.getBody();
// Read own tasks
ResponseEntity<List> readResponse = restTemplate.exchange(
"/api/tasks",
HttpMethod.GET,
new HttpEntity<>(headers),
List.class
);
if (readResponse.getStatusCode() != HttpStatus.OK) {
return TaskAppLoadTestResult.failure(clientId, readResponse.getStatusCodeValue());
}
return TaskAppLoadTestResult.builder()
.clientId(clientId)
.username(username)
.authenticated(true)
.operationSuccessful(true)
.statusCode(200)
.createdTaskId(createdTask.getId())
.build();
} catch (Exception e) {
return TaskAppLoadTestResult.error(clientId, e.getMessage());
}
}
private TaskAppLoadTestResult performUnauthenticatedAttacks(int clientId) {
try {
// Versuche Tasks ohne Auth zu lesen
ResponseEntity<String> response = restTemplate.getForEntity("/api/tasks", String.class);
return TaskAppLoadTestResult.builder()
.clientId(clientId)
.authenticated(false)
.operationSuccessful(response.getStatusCode().is2xxSuccessful())
.statusCode(response.getStatusCodeValue())
.build();
} catch (Exception e) {
return TaskAppLoadTestResult.error(clientId, e.getMessage());
}
}
private TaskAppLoadTestResult performCrossUserAttacks(int clientId, String attacker, String victim) {
String attackerToken = createJwtToken(attacker);
HttpHeaders headers = new HttpHeaders();
headers.setBearerAuth(attackerToken);
try {
// Erstelle Task für Victim (über Admin-Call oder DB-direktzugriff)
Task victimTask = createTaskForUserDirectly(victim, "Victim's Secret Task");
// Versuche als Attacker auf Victim's Task zuzugreifen
ResponseEntity<String> response = restTemplate.exchange(
"/api/tasks/" + victimTask.getId(),
HttpMethod.GET,
new HttpEntity<>(headers),
String.class
);
return TaskAppLoadTestResult.builder()
.clientId(clientId)
.username(attacker)
.authenticated(true)
.crossUserAttack(true)
.operationSuccessful(response.getStatusCode().is2xxSuccessful())
.statusCode(response.getStatusCodeValue())
.targetTask(victimTask.getId())
.build();
} catch (Exception e) {
return TaskAppLoadTestResult.error(clientId, e.getMessage());
}
}
}
@Data
@Builder
class TaskAppLoadTestResult {
private final int clientId;
private final String username;
private final boolean authenticated;
private final boolean crossUserAttack;
private final boolean operationSuccessful;
private final int statusCode;
private final Long createdTaskId;
private final Long targetTask;
private final String error;
public static TaskAppLoadTestResult error(int clientId, String error) {
return TaskAppLoadTestResult.builder()
.clientId(clientId)
.operationSuccessful(false)
.error(error)
.build();
}
public static TaskAppLoadTestResult timeout() {
return TaskAppLoadTestResult.builder()
.operationSuccessful(false)
.error("Timeout")
.build();
}
public static TaskAppLoadTestResult failure(int clientId, int statusCode) {
return TaskAppLoadTestResult.builder()
.clientId(clientId)
.operationSuccessful(false)
.statusCode(statusCode)
.build();
}
}
💡 Action Items für Nova’s Production-Ready TaskApp
🎯 Level 1: TaskApp Security Basics (diese Woche)
- OWASP Top 5 für Nova’s Task-API implementieren
- @WithMockUser Tests für Task-Access-Control schreiben
- Input Validation für alle Task-Create/Update-Endpoints
- XSS Protection für Task-Title und Description
🎯 Level 2: TaskApp Resilience (nächste Woche)
- Circuit Breaker für EmailService und PaymentService
- Rate Limiting für Task-Creation einführen
- Bulkhead Pattern für verschiedene Task-Types
- Property-Based Security Tests für Task-Search
🎯 Level 3: TaskApp Chaos Engineering (nächster Monat)
- Database Chaos Testing für Task-Repository
- Load Testing mit Security-Focus
- Cross-User Attack Simulation automatisieren
- Performance unter Chaos messen und optimieren
🎯 Level 4: Production-Ready TaskApp (Quartalsziel)
Challenge: „Nova’s Unhackable TaskApp“
- Vollständige OWASP Top 10 Coverage für alle Task-Endpoints
- Automated Security + Chaos Testing in CI/CD Pipeline
- Circuit Breaker für alle External Services
- Load-Testing mit 1000+ concurrent Users ohne Security-Bypasses
🎉 Fazit: Nova’s TaskApp ist jetzt Production-Ready! 🚀
Was wir heute erreicht haben:
🔒 Nova’s TaskApp Security-Transformation
- OWASP Top 10 speziell gegen die Task-API implementiert
- Property-Based Security Testing für alle Task-Inputs
- Authentication/Authorization für Task-Access-Control
- Cross-User Attack Prevention in allen Task-Operationen
🌪️ Nova’s TaskApp Chaos Engineering
- Circuit Breaker für EmailService und PaymentService
- Bulkhead Pattern für verschiedene Task-Processing-Types
- Database Resilience unter extremer Last
- Load Testing mit Security-Focus
🚀 Nova’s TaskApp Production-Readiness
- Security + Performance unter realistischer Last
- Graceful Degradation bei External Service Failures
- No Security-Bypasses unter High-Concurrency
- Real-world Attack Simulation
Nova’s Reaktion nach den Tests:
„Wow… meine kleine TaskApp kann jetzt echten Angriffen standhalten! Und wenn der Email-Service down ist, werden Tasks trotzdem erstellt. Das fühlt sich an wie echte Software!“ 🤩
Code Sentinel stolz: „Nova, deine TaskApp ist jetzt nicht nur funktional korrekt – sie ist Security-hardened und Chaos-resistant. Das ist der Unterschied zwischen Hobby-Projekt und Enterprise-Software!“
Für alle TaskApp-Entwickler da draußen:
Security und Resilience sind kein Afterthought! Nova’s TaskApp zeigt: Auch ein einfacher Task-Manager kann Production-Ready Security und Chaos Engineering haben. Start simple, but think Production from day one!
Für alle Team-Leads:
Nova’s TaskApp-Transformation zeigt den ROI von Security + Chaos Testing: Lieber 2 Tage in Tests investieren als 2 Wochen Incident Response nach einem Security-Breach oder Service-Ausfall.
📝 Kurze Zusammenfassung
🔒 Nova’s TaskApp Security-Testing:
- OWASP Top 10 speziell für Task-API implementiert
- Property-Based Security Testing für Task-Inputs mit jqwik
- Spring Security Testing für Task-Access-Control
- Cross-User Attack Prevention and Testing
🌪️ Nova’s TaskApp Chaos Engineering:
- Circuit Breaker für External Services (Email, Payment)
- Bulkhead Pattern für Task-Processing-Types
- Database Chaos Testing unter extremer Last
- Load Testing mit kombiniertem Security-Focus
🎯 Nächste Woche: Legacy-Code & Charakterisierungstests – Elyndra zeigt Code-Archäologie an Nova’s TaskApp-Evolution!
❓ FAQ – Nova’s TaskApp Security & Chaos Testing
Frage 1: Warum so viel Security-Testing für eine „einfache“ TaskApp?
Antwort: Jede App, die User-Daten speichert, ist ein Angriffsziel! Nova’s TaskApp hat User-Accounts, Task-Data, Email-Integration – das ist bereits ein vollwertiges Attack-Surface. Better safe than sorry!
Frage 2: Sind Circuit Breaker nicht Overkill für EmailService?
Antwort: Nein! Email-Services sind notorisch unzuverlässig (Rate Limits, Timeouts, Downtimes). Circuit Breaker verhindert, dass Email-Probleme Nova’s ganze TaskApp lahmlegen. Task-Creation muss funktionieren, auch ohne Email!
Frage 3: Property-Based Security Testing findet mehr Bugs als normale Tests?
Antwort: Absolut! Normale Tests prüfen nur bekannte Attack-Vectors. Property-Based Tests mit jqwik generieren hunderte unerwartete Inputs. Nova’s TaskApp hätte ohne Property-Tests nie die Template-Injection-Vulnerability in Task-Titles gefunden!
Frage 4: Wie oft soll ich Chaos Engineering laufen lassen?
Antwort: Für Nova’s TaskApp: Chaos Tests in CI/CD Pipeline (täglich), Full Chaos Engineering wöchentlich in Staging. Nie in Production ohne Team-Zustimmung und Monitoring-Setup!
Frage 5: Bulkhead Pattern für eine TaskApp – ist das nicht übertrieben?
Antwort: Kommt drauf an! Wenn Nova’s TaskApp nur 10 Users hat: Overkill. Aber wenn sie 1000+ concurrent Task-Creations hat: Lebensrettend! System-Tasks (DB-Cleanup) sollten nie User-Tasks blockieren. Skalierung beginnt in der Architektur!
Dr. Cassian Holt verwandelt Nova’s einfache TaskApp in eine Production-Ready, Security-gehärtete, Chaos-resistente Enterprise-Anwendung. Code Sentinel’s jahrelange Security-Expertise endlich in praktischer Anwendung!
Tags: #TaskAppSecurity #NovaTaskApp #OWASP #ChaosEngineering #SpringSecurity #PropertyBasedTesting #CircuitBreaker #BulkheadPattern #ProductionReady
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