Spring AI with Vertex 101

Follow this guide from spring and create a sample application. I have also added spring-boot-starter-web and spring-ai-starter-model-vertex-ai-gemini etc. as the dependency. Then, download the project and open it in your favorite IDE. I have chosen gradle instead of maven. The dependency block in the build.gradle will look like something below.

	implementation 'org.springframework.boot:spring-boot-starter-web'
	implementation("org.springframework.ai:spring-ai-starter-model-vertex-ai-gemini:1.0.0")

Then create a sample controller that uses a VertexAiGeminiChatModel. You can use a sample from here or here.

spring.ai.vertex.ai.gemini.project-id=<fill-your-project-id>
spring.ai.vertex.ai.gemini.location=<your-location>
spring.ai.vertex.ai.gemini.chat.options.model=gemini-2.0-flash
spring.ai.vertex.ai.gemini.chat.options.temperature=0.5

Then as mentioned here, create a project in the google cloud and follow the below steps.

In the Google Cloud console, create or select a Google Cloud project.
Ensure that Billing is enabled for your project. Generative AI models usually require a billed account. At the time of writing, Google is providing a 300$ free credit to use it.
In the console, enable the Vertex AI API.

Get the project id and your nearest google cloud location from the Google Cloud console and fill it in your application.properties.

We should also configure our system to login to Google cloud as we need to login to use the Vertex API. Please follow the below steps for that.

In your terminal, install the gcloud CLI, which is essential for managing resources and setting up authentication for local development where you run your application. Set up your application default credentials by running the following commands:
```
# initialize gcloud 
gcloud init
# set the Project ID you have configured
gcloud config set project <PROJECT_ID>
# authenticate with your user account
gcloud auth application-default login <GMAIL ID>
```
Now run the application using IDE or by running ./gradlew bootRun.

Type the following URL in the browser and it should output something like {“generation”:”Good morning! How can I help you today?\n”} http://localhost:8080/ai/generate?message=goodmorning

Voila. You are ready to go.

Here you can find a similar project that use Vaadin with Vertex API.

NTV

Spring AI with Vertex 101