✈️ Travel Agent Assistant

An AI-powered travel planning assistant built with Java, Spring Boot. It orchestrates a sequential multi-agent workflow to search for flights, recommend hotels, and construct a complete day-by-day itinerary.

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🛠️ Google Cloud Platform (GCP) Setup

To use the underlying Gemini model (via Vertex AI), you need to set up a GCP project, configure your local authentication, and enable the Agent Platform API.

1. Create a GCP Project

You can create a new GCP project using either the Google Cloud Console

1. Visit the Google Cloud Console.
2. Click the project dropdown in the top navigation bar and select New Project.
3. Enter your project name/ID and click Create.

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2. Connect with gcloud CLI

Once your project is created, configure your local environment to connect to it.

1. Set your active project:

   gcloud config set project YOUR_PROJECT_ID

2. Authenticate Application Default Credentials (ADC): This enables Vertex AI clients running on your local machine to authenticate automatically.

   gcloud auth application-default login

3. Set the billing/quota project: This prevents API quota errors by linking calls to your billing account project.

   gcloud auth application-default set-quota-project YOUR_PROJECT_ID

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3. Enable the Agent Platform API (Vertex AI)

The SDK utilizes the Gemini model through the Vertex AI APIs (aiplatform.googleapis.com).

1. Navigate directly to the Vertex AI API Overview (replace YOUR_PROJECT_ID in the URL).
2. Click the Enable button.

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🚀 Building and Running Locally

Once GCP is set up, follow these steps to build and run the application.

Prerequisites

• Java 17 or higher
• Docker (optional)

Build the Application

Compile the source code and package it into an executable JAR:

./gradlew build -x test

Run the Server

Start the application with standard local configurations:

./gradlew bootRun

The server will start, by default listening on port 8080.

Test the Agent

Open your web browser and navigate to:

http://localhost:8080

This opens the built-in interactive web UI where you can chat with the travel agent.