Log Analyzer Microservice

This is a simple Spring Boot microservice that provides a REST endpoint to analyze raw log strings and return an AI-generated summary of the key issues.

Features

• REST Endpoint: A single POST /analyze-log endpoint.
• JSON Payload: Accepts and returns JSON.
• AI-Powered Analysis: Simulates an AI analysis of log data (currently mocked).
• Error Handling: Provides meaningful error messages for invalid requests.
• Unit Tested: Includes unit tests for the service and controller layers.

Prerequisites

• Java 8 or later
• Apache Maven

How to Build and Run

1. Clone the repository:

   git clone <repository-url>
   cd log-analyzer

2. Build the project using Maven:

   mvn clean install

3. Run the application:

   mvn spring-boot:run

   The application will start on port 8080.

Example Usage

You can use a tool like curl to interact with the API.

Example 1: NullPointerException

Request:

curl -X POST http://localhost:8080/analyze-log \
-H "Content-Type: application/json" \
-d '{
  "logContent": "2025-06-10 14:32:01.123 ERROR [main] com.example.app.Processor - Unexpected error occurred\njava.lang.NullPointerException: Cannot invoke \"String.length()\" because \"s\" is null\n\tat com.example.app.Processor.process(Processor.java:42)"
}'

Response:

{
  "mainError": "java.lang.NullPointerException",
  "probableCause": "A variable was accessed before it was assigned an object.",
  "suggestedFix": "Ensure all objects are initialized before use. Check the stack trace for the exact line number."
}

Example 2: SQL Exception

Request:

curl -X POST http://localhost:8080/analyze-log \
-H "Content-Type: application/json" \
-d '{
  "logContent": "2025-06-10 15:01:05.567 ERROR [task-executor-1] o.h.e.j.s.SqlExceptionHelper - Connection refused\njava.sql.SQLException: Connection refused\n\tat com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129)"
}'

Response:

{
  "mainError": "java.sql.SQLException: Connection refused",
  "probableCause": "The database server is either not running or is blocking the connection.",
  "suggestedFix": "Verify that the database is running and accessible. Check firewall rules and database connection strings."
}

Example 3: Invalid Request (Blank Log Content)

Request:

curl -X POST http://localhost:8080/analyze-log \
-H "Content-Type: application/json" \
-d '{
  "logContent": ""
}'

Response (HTTP 400 Bad Request):

{
  "error": "Log content cannot be blank."
}