Step-by-step guides for the most common Windsurf problems, written by real developers.
CORS configuration is too permissive after Cascade set it to allow all origins ('*'). This is a security vulnerability that allows any website to make requests to your API, potentially accessing user data through browser-based attacks like CSRF.
Cascade likely used wildcard to 'fix' CORS issues without understanding security implications.
API has duplicate endpoints with the same path and method after Cascade generated new controller methods. This causes routing conflicts where requests hit the wrong handler, or Spring Boot fails to start due to ambiguous endpoint definitions.
Cascade generated endpoints without checking for existing implementations.
API clients break because Cascade changed the response format of endpoints. Clients expect certain JSON fields that are no longer present, or field names changed. This breaks mobile apps, frontend, and third-party integrations.
Cascade likely simplified or reorganized response objects without considering backward compatibility.
Security middleware is not executing after Cascade refactored the filter chain configuration. CORS is broken, authentication is bypassed, or request logging is missing. This is a critical security issue where unauthenticated requests are being accepted.
Cascade likely modified WebSecurityConfig or filter registration without understanding the importance of middleware order.
Webhook signature validation is broken after Cascade refactored the verification code. This is a critical security issue - spoofed webhooks from attackers are being accepted as legitimate. Stripe or other webhook payloads are not being verified before processing.
Cascade likely removed or modified the signature verification logic during refactoring.
API rate limiting is disabled after Cascade removed rate limiting configuration. This exposes endpoints to abuse attacks. Users can make unlimited requests, potentially causing DoS or rapid data exfiltration.
Cascade likely removed @RateLimiting or rate limiting bean configuration thinking it was unnecessary.
Encryption keys are hardcoded in application code after Cascade generated encryption/decryption logic. This is a critical security vulnerability - anyone with access to the codebase can decrypt encrypted data, defeating the purpose of encryption.
Keys must be immediately moved to environment variables or key management service.
Critical file upload vulnerability after Cascade removed file validation. Users can upload arbitrary files including executables or malicious scripts. Files are stored in web-accessible directory and can be executed on the server.
This is a critical security issue requiring immediate attention.
Expert payout functionality is broken after Cascade refactored Stripe Connect integration. The OAuth flow fails, experts cannot complete Stripe account linking, and payouts cannot be processed. This directly impacts expert earnings and platform trust.
Cascade likely modified the OAuth callback handling or token storage without understanding Stripe's requirements.
Expert cannot create GitHub forks for fix requests after Cascade modified the GitHub OAuth integration. The fork operation fails with 'permission denied' even though the user authenticated. This breaks the core expert workflow.
Cascade likely removed required OAuth scopes or modified API call authorization.
Email notifications are not being sent after Cascade modified the email queue processing. Emails remain stuck in the queue indefinitely, and users don't receive important notifications like fix approvals or payment confirmations.
Cascade likely broke the async email worker or message consumer.
Critical SQL injection vulnerability exists in Cascade-generated code. User input is directly concatenated into SQL queries without parameterization, allowing attackers to execute arbitrary SQL and steal data.
This is a critical security issue that must be fixed immediately.
After Cascade refactored your authentication flow, users get caught in infinite redirects between login and home page. The session is created but the redirect logic continuously checks for authentication and loops back.
This typically happens when Cascade modified session validation, redirect filters, or authentication success handlers without properly understanding the existing flow.
API requests with JWT tokens are being rejected with signature validation errors or token validation failures, even though tokens appear valid. Cascade likely modified JWT signing key management or validation logic during refactoring.
This breaks API authentication and causes 401/403 responses for previously working endpoints.
Sessions are no longer persisting in Redis after Cascade refactored session configuration. Users are logged out when the application restarts, and distributed session management across multiple instances fails.
Cascade likely modified spring-session-redis configuration or removed crucial Redis repository setup during code reorganization.
Windsurf's Cascade assistant generated OAuth token handling code that accidentally hardcoded or logged sensitive tokens in plaintext. This creates a critical security vulnerability where authentication tokens are visible in version control history or logs.
You notice tokens in git history, environment files, or console output that Cascade created during refactoring.
Application crashes because JPA expects columns that don't exist in database, or database has columns that entity model doesn't know about. Cascade generated entity changes without creating corresponding database migrations.
This typically manifests as 'column not found' errors or unexpected NULL values in queries.
Database performance degraded after Cascade refactored data access code. Logs show hundreds of individual SELECT queries being executed instead of efficient batch loading. A single parent query triggers N queries for children.
Cascade likely generated loops that fetch entities individually instead of using batch loading or join strategies.
Deserialization fails for objects saved in Redis cache or session store after Cascade modified entity fields. Old serialized objects cannot be deserialized with new class definition. This breaks session persistence and cached data retrieval.
Cascade likely added/removed fields without considering serialization compatibility.
Data consistency issues appear after Cascade modified transaction isolation level. Race conditions occur where two concurrent operations see inconsistent data. Dirty reads allow transactions to see uncommitted changes from other transactions.
Cascade likely changed isolation level to improve performance without understanding the consequences.
Hibernate throws LazyInitializationException when accessing related entities that Cascade marked as lazy-loaded. The session closes before the related data is fetched, causing 'no Session' errors at runtime.
Cascade refactored entity relationships without considering transaction boundaries or fetch strategy.
Database migrations generated by Cascade conflict with existing migrations, causing the migration engine to fail during startup. The application won't boot because Flyway/Liquibase can't determine the correct migration order.
Cascade may have generated new migrations without checking existing schema version files.
Spring Boot application fails to start because environment variables are not being loaded after Cascade modified configuration. Application properties are null even though environment variables are set, causing NullPointerException at startup.
Cascade likely changed property placeholder syntax or removed @ConfigurationProperties annotations.
Custom annotations Cascade generated are not being recognized at runtime. Annotations are present in code but the reflection/annotation processing doesn't find them. This breaks aspect-oriented features, validation, or custom framework logic that depends on annotations.
Cascade likely used incorrect annotation configuration or retention policy.
Spring application fails to start with 'circular dependency' error after Cascade added new beans. Bean A depends on Bean B which depends on Bean A, creating an unsolvable dependency graph. The application cannot instantiate beans in any order.
Cascade likely generated beans without understanding dependency injection order.
Application fails to start with 'resource not found' error after Cascade generated code that references files that don't exist. This might be templates, configuration files, or other classpath resources.
Cascade generated code assuming files exist but didn't verify they're actually present.
Application crashes frequently with NullPointerException cascades after Cascade generated code that doesn't properly handle null values. Methods receive null parameters but don't check before dereferencing. One NullPointerException in deep call stack causes application failure.
Cascade likely generated code without defensive null handling.
Scheduled tasks are not running after Cascade modified scheduling configuration. Maintenance jobs, auto-approval tasks, and cleanup jobs don't execute, causing data accumulation and operational issues.
Cascade likely removed @EnableScheduling or modified @Scheduled methods.
Gradle build fails with 'cannot find symbol' errors or 'unresolved dependency' when Cascade generated code that uses libraries not in your classpath. The generated code imports classes that don't exist in your project.
Cascade suggests library usage without automatically updating build configuration.
Docker build takes excessive time or fails with OOM errors after Cascade modified the Dockerfile. The multi-stage build was restructured inefficiently, causing large intermediate layers or missing cache optimization.
Container builds now fail in CI/CD pipelines due to timeout or resource constraints.
GitHub Actions workflow or Jenkins pipeline fails after Cascade modified CI/CD configuration. Build steps are skipped, wrong versions deployed, or secrets are not accessible.
The pipeline structure was changed without understanding dependencies between stages.
Your Windsurf-generated app fails to send emails through Nodemailer with TLS handshake errors. Email functionality that worked in development breaks when deployed, or stops working suddenly after the email provider updates their security settings.
TLS (Transport Layer Security) handshake failures mean your app cannot establish a secure connection to the SMTP server. This blocks all email sending — password resets, notifications, verification emails, and any other transactional emails your app depends on.
The error may be intermittent, working sometimes and failing others, or it may fail consistently after a deployment or SMTP provider change. Common scenarios include moving from development to production, switching email providers, or the provider deprecating old TLS versions.
Your Windsurf-generated app tries to send emails in bulk — newsletters, notifications, invitations — and hits rate limits from the email provider. Some emails send while others silently fail, bounce, or get queued indefinitely. Your SMTP provider may temporarily block your account.
Cascade often generates email sending code that loops through recipients and fires off emails as fast as possible, without any throttling, queuing, or error handling for rate limits. This works fine when sending a few emails in development but fails catastrophically when sending to hundreds or thousands of recipients.
The consequences are serious: users don't receive important notifications, your email domain reputation drops, and your account may be suspended by the email provider.
Emails sent from your Windsurf-generated app arrive without their attachments, with empty attachments, or with corrupted files that can't be opened. The email itself sends successfully, but the attached file is missing or broken.
This commonly happens with invoice PDFs, receipt exports, user-uploaded files, and generated reports that your app needs to send via email. Cascade may have configured the attachment incorrectly, pointing to a file that doesn't exist in production, using wrong encoding, or hitting size limits.
The issue is hard to debug because the email send operation typically succeeds without errors — the problem only becomes apparent when the recipient opens the email and finds the attachment missing or corrupted.
Running npm install in your Windsurf-generated project fails with ERESOLVE peer dependency conflict errors. Cascade added packages that require incompatible versions of shared dependencies, and npm cannot resolve a valid dependency tree.
This is one of the most frustrating issues in Node.js projects because it blocks all progress — you can't install any packages until the conflict is resolved. The error messages are dense and confusing, listing multiple packages and version ranges that seem impossible to untangle.
The problem typically appears after Cascade adds a new package, when upgrading an existing package, or when combining packages that Cascade recommended in different sessions without checking compatibility.
Your Windsurf-generated Dockerfile builds fail or the container crashes at runtime because system-level dependencies are missing. Node.js native modules like sharp, canvas, bcrypt, or puppeteer require system packages (libvips, libc, chromium) that aren't installed in the Docker image.
Cascade generates a Dockerfile that works for pure JavaScript apps but doesn't account for native dependencies. The build may fail during npm install when compiling native modules, or worse, it may build successfully but crash at runtime when the native module is first loaded.
This is especially common when deploying to production for the first time after developing locally, where system dependencies were already present on the development machine.
Fixed-position elements in your Windsurf-generated app — sticky headers, bottom navigation bars, floating action buttons, modals — behave erratically in iOS Safari. They jump when scrolling, disappear behind the keyboard when typing, or drift out of position when the address bar shows or hides.
iOS Safari handles position: fixed differently from desktop browsers and even Android Chrome. The viewport dynamically resizes as the address bar and toolbar show/hide during scrolling, and the virtual keyboard pushes fixed elements around instead of overlaying them. This affects millions of iPhone users.
You might see a bottom navigation bar floating in the middle of the screen, a fixed header that bounces during scroll, a modal that's half-hidden behind the keyboard, or a chat input fixed to the bottom that jumps above the keyboard and back.
Text in your Windsurf-generated app is tiny and unreadable on mobile devices. Users have to pinch-zoom to read content, form labels are barely visible, and the overall experience feels like viewing a desktop site on a phone. iOS Safari may also auto-zoom on input fields, causing disorienting layout shifts.
This is a common problem with AI-generated apps that were designed primarily for desktop viewing. Cascade generates layouts that look great on a large screen but doesn't always scale typography for smaller devices. Even when the layout is responsive, font sizes may remain at desktop values.
Poor text readability on mobile is both a usability problem and an accessibility issue. Google's mobile-friendly test penalizes pages with text smaller than 16px, which can hurt your search rankings.
Your Windsurf-generated app has flexbox layouts that look perfect on desktop but cause horizontal overflow and broken layouts on mobile. Content extends beyond the viewport, text doesn't wrap, and users have to scroll horizontally to see the full page.
Flexbox is the most common layout system in modern web apps, and Cascade generates it extensively. However, the default flex behavior has several gotchas that cause mobile overflow — especially with text content, images, and nested flex containers. The layout may work on standard phone widths but break on smaller devices or when content is longer than expected.
Symptoms include a horizontal scrollbar on the page, cards or panels extending off-screen, text truncated or overlapping other elements, and input fields wider than the screen.
Memory usage continuously increases after Cascade generated new code. Application eventually runs out of memory and crashes. Heap analysis shows objects are not being garbage collected even after they're no longer needed.
Cascade likely created resource holders or listeners that are never cleaned up.
Application becomes unresponsive after Cascade generated a complex regex pattern for validation. Regex matching against certain inputs takes seconds or minutes, consuming 100% CPU. This is a Regular Expression Denial of Service (ReDoS) vulnerability.
Cascade likely generated a regex with catastrophic backtracking.
WebSocket connections are dropping frequently after Cascade refactored real-time communication code. Users see 'connection lost' messages, and real-time updates stop arriving. The application falls back to polling, negatively impacting performance.
Cascade likely modified connection handling or heartbeat logic without proper testing.
CPU usage spikes to 100% after Cascade added new code, causing application to become unresponsive. Server cannot handle normal traffic load, and response times are terrible. Profiling shows certain methods consuming excessive CPU.
Cascade likely generated algorithms with high computational complexity or inefficient loops.
Frontend bundle size increased dramatically after Cascade added new JavaScript dependencies. Page load time increased significantly, negatively impacting user experience and SEO metrics.
Cascade suggested useful libraries without considering bundle size impact or suggesting tree-shaking options.
Database queries are extremely slow after Cascade generated new data access code. The application page load takes 30+ seconds where it used to take 2 seconds. Query execution plans show full table scans or missing indexes.
Cascade likely generated queries without considering query optimization or database structure.
Users see stale cached data after Cascade refactored cache management. Data is updated in database but cached version isn't invalidated, so users continue seeing old information until cache expires naturally (after hours or days).
Cascade likely removed @CacheEvict annotations or cache clearing logic.
Socket.io room-based messaging in your Windsurf-generated app doesn't work correctly. Messages meant for a specific room are either broadcast to all connected users, not delivered to anyone, or only reach some members of the room. Chat rooms, game lobbies, or collaborative editing features are broken.
Cascade generates Socket.io code that works in single-server development but breaks in production due to room management issues, adapter configuration problems, or incorrect emit targeting. Rooms appear to work initially but fail when multiple users join or when the server scales.
You might see messages appearing in the wrong chat room, notifications going to all users instead of specific groups, or real-time updates that only work for the first user who joined a room.
The user presence system in your Windsurf-generated app shows incorrect online/offline status. Users who closed the app hours ago still appear as online, users who are actively using the app show as offline, or presence status flickers between online and offline rapidly.
Presence tracking is crucial for chat apps, collaborative tools, and social features. When it's unreliable, users send messages to people who aren't there, miss that collaborators are available, or lose trust in the application's real-time features.
The issue often manifests differently across browsers and devices — a user may appear online in their own browser but offline to everyone else, or vice versa. Mobile users are particularly affected because their connections are frequently interrupted.
Your Windsurf-generated app uses database change streams or real-time subscriptions to push updates to the frontend, but events are not firing. Inserts, updates, and deletes in the database don't trigger the real-time listeners, so the UI stays stale and users have to manually refresh to see new data.
This is critical for features like live feeds, collaborative editing, real-time dashboards, and chat applications. Cascade sets up the subscription code, and it may work intermittently or only for certain operations, making the bug difficult to reproduce and diagnose.
The issue may appear as a dashboard that only updates on page refresh, a chat where new messages don't appear until you reload, or a collaborative document that doesn't reflect other users' changes in real time.
Windsurf's Cascade assistant hardcoded API keys, database credentials, JWT secrets, or other sensitive values directly into your source code, and those files were committed to your Git repository. Even if you delete the secrets now, they remain in your Git history and may already be compromised.
This is one of the most common and dangerous security issues with AI-generated code. Cascade focuses on making things work, so when it needs an API key or connection string, it may place the value directly in the code rather than referencing environment variables.
GitHub, GitLab, and other platforms actively scan for leaked credentials, and automated bots scrape public repos for secrets within minutes of them being pushed. If your repo is public, assume any committed secrets have been compromised.
Windsurf's Cascade assistant generated JavaScript or TypeScript code that uses eval(), new Function(), or setTimeout/setInterval with string arguments to dynamically execute code. These patterns create severe code injection vulnerabilities that allow attackers to run arbitrary code in your application.
This typically happens when Cascade generates code to parse user input, build dynamic queries, process configuration files, or create flexible template systems. The generated code works correctly but introduces a critical attack surface.
You might discover this during a security audit, when a linter flags eval usage, or when a code review catches the pattern. If deployed to production, any user-controlled input reaching these eval calls could be exploited.
Windsurf's Cascade generated API routes and server endpoints that process requests without verifying the user is authenticated or authorized. Anyone who knows the URL can access, modify, or delete data without logging in.
This happens frequently when Cascade creates new CRUD endpoints, admin routes, or data export functionality. The generated handlers focus on the business logic but skip the authentication and authorization layer entirely. Your app may have a login page, but the API behind it is wide open.
You might discover this when testing your API directly with curl or Postman and realizing it returns data without any authentication header, or when a user accesses another user's data by changing an ID in the URL.
Images, documents, and file download links in your Windsurf-generated app break after a short time. Users see broken images, get access denied errors when clicking download links, or see files that loaded fine moments ago now showing 403 Forbidden errors.
This happens because your app uses signed URLs to serve files from private cloud storage (Supabase Storage, S3, or GCS), and the URLs expire too quickly. Cascade may have set a very short expiration time, or the URLs are being generated once and cached while the expiration passes.
The issue is especially frustrating for users because everything appears to work initially, then breaks silently. Pages that worked fine a few minutes ago suddenly show broken images everywhere.
Files uploaded to blob storage through your Windsurf-generated app become corrupted when downloaded. PDFs are unreadable, images show garbled data, ZIP files fail to extract, and documents open as random characters. The upload appears to succeed, but the stored file is damaged.
This is a particularly insidious bug because uploads appear successful — no errors are thrown, the file shows up in storage, and the file size may even look correct. But when a user downloads and opens the file, it's broken.
The corruption typically affects binary files (images, PDFs, ZIPs) while text files may work fine, which is a strong clue that the issue is related to encoding or stream handling.
File uploads in your Windsurf-generated app crash with multer errors. The server either runs out of memory processing large files, throws LIMIT_UNEXPECTED_FILE errors, or crashes silently when handling multipart form data.
Multer is the most common file upload middleware for Node.js/Express apps, and Cascade frequently generates upload endpoints using it. However, the generated configuration often has missing error handling, incorrect field names, or no memory limits, causing production crashes.
The issue typically appears when users upload files larger than expected, when multiple files are uploaded simultaneously, or when the form field name doesn't match the multer configuration.
Tests in your Windsurf-generated project are making real HTTP requests to external APIs instead of using mocks. This causes tests to be slow, flaky, expensive (burning API credits), and destructive (creating real data in third-party services). Password reset emails get sent to real users during tests, real charges appear on payment processors, and tests fail when external APIs are down.
Cascade generates test files that set up the test scenario but doesn't intercept outbound HTTP requests. The test code calls your app's functions, which in turn call real Stripe, SendGrid, OpenAI, or other APIs. In development this may go unnoticed because the API keys are for test/sandbox environments, but it still makes tests slow and unreliable.
The problem becomes critical when tests run in CI/CD pipelines where they execute on every push, rapidly consuming API quotas and creating garbage data in external services.
Tests in your Windsurf-generated project fail intermittently because the database retains data from previous test runs. Tests that pass individually fail when run together, test order matters, and adding a new test breaks existing ones. The test suite is unreliable and developers lose confidence in the results.
Cascade generates tests that create database records but doesn't clean them up afterward. Test A inserts a user, Test B expects an empty users table, and Test B fails because Test A's user is still there. The problem gets worse as more tests are added, creating an increasingly tangled web of data dependencies.
The failures are often non-deterministic — they depend on which tests run first, whether a previous test run completed fully, and sometimes even on timing. This makes them extremely hard to debug.
Jest mocking doesn't work in your Windsurf-generated project that uses ES modules (ESM). jest.mock() calls are silently ignored, mocked modules still return real implementations, or you get errors about import statements not being mockable. Tests that should use mocked dependencies are hitting real APIs or databases.
This is one of the most common testing frustrations in modern JavaScript projects. Jest was designed for CommonJS (require), and its mocking system doesn't work the same way with ESM imports. Cascade generates test files with jest.mock() patterns that only work in CommonJS, leading to tests that appear to set up mocks correctly but actually use the real modules.
You might notice this when tests make real HTTP requests, modify your actual database, or fail with authentication errors — all signs that mocking isn't working and real dependencies are being used.
HTML pages fail to render after Cascade modified Thymeleaf templates. Error pages show template processing exceptions instead of actual content. The application shows 'Thymeleaf template not found' or 'variable not available in context' errors.
Cascade likely broke variable references or modified template structure incorrectly.
Modal dialogs show stale data or don't reflect state changes after Cascade refactored component logic. When you open a modal after editing, it shows old information. State updates in the main component don't propagate to the modal.
Cascade likely broke prop passing, event emission, or state management between components.
Form validation is completely broken after Cascade refactored form submission code. Invalid data is being accepted, required fields show no validation errors, and server receives malformed data.
Cascade likely removed validation logic thinking it was redundant or simplified the submission handler.
Website layout is not responsive after Cascade refactored CSS. Mobile views are broken, grid layouts collapse incorrectly, or media queries are not working. The responsive design that worked before is now non-functional.
Cascade likely removed or modified media queries, flexbox properties, or CSS variables during refactoring.
Payment form is not functional after Cascade refactored the UI. Form fields don't submit properly, Stripe Elements are not initializing, or the form displays errors. Users cannot complete payments.
Cascade likely modified Stripe JavaScript integration or form submission handlers without testing the complete flow.
String comparisons fail for users in certain locales after Cascade generated comparison code. Case-insensitive comparisons don't work correctly in non-English locales, or locale-specific characters are not handled properly. Users report login failures or data lookup issues.
Cascade used simple .toLowerCase() without considering locale-specific case conversion rules.
Cross-site scripting (XSS) vulnerability introduced in Cascade-generated templates. User input is rendered without HTML escaping, allowing attackers to inject malicious JavaScript that runs in other users' browsers.
This is a critical security issue requiring immediate fix.
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