Fix Build Errors

Systematically resolve compilation/build errors.

Process

1. Run build - Capture full error output
2. Parse errors - Extract and categorize all errors
3. Prioritize - Fix root causes first (dependency → syntax → type)
4. Fix iteratively - One error at a time, rebuild after each
5. Verify - Confirm clean build

Build Commands

# Java/Maven
mvn compile 2>&1 | head -100

# Java/Gradle
./gradlew build 2>&1 | head -100

# TypeScript
npx tsc --noEmit 2>&1

# Node.js
npm run build 2>&1

# Full check
npm run build && npm run lint && npm run test

Error Categories (Fix Order)

1. Dependency Errors

• Missing dependencies
• Version conflicts
• Circular dependencies

2. Import/Module Errors

• Missing imports
• Wrong import paths
• Module not found

3. Syntax Errors

• Typos
• Missing brackets/semicolons
• Invalid syntax

4. Type Errors

• Type mismatches
• Missing type annotations
• Incompatible types

5. Logic Errors

• Undefined variables
• Wrong method signatures
• Missing return statements

Resolution Patterns

Java

// Missing import → Add import
import com.example.ClassName;

// Type mismatch → Fix type or cast
String value = object.toString();

// Null safety → Add null check
if (object != null) { ... }

TypeScript

// Missing type → Add type annotation
function process(data: DataType): ResultType { }

// Undefined check → Optional chaining
const value = obj?.property ?? defaultValue;

// Type assertion (last resort)
const typed = value as ExpectedType;

Common Build Commands

# Java/Maven
mvn compile

# Java/Gradle
./gradlew build

# Node.js/TypeScript
npm run build
pnpm run build

# Check types only
npx tsc --noEmit

Error Resolution Order

1. Missing imports - Add required dependencies
2. Type errors - Fix type mismatches
3. Syntax errors - Fix code syntax
4. Dependency issues - Update package versions

Output Format

Build Output

[paste build errors here]

Errors Found: X

#	File	Error	Fix Applied
1	...	...	...

Verification

[final build output - should be clean]

Rules

• Always run build first to get current errors
• Fix one error at a time
• Rebuild after each fix to catch cascading issues
• Never suppress errors with @ts-ignore or similar
• If stuck, explain the error and ask for guidance

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Run build command and show me the errors.