# Connect Quarkus (Reactive) to Neon

<img src="../img/site-assets/neon.com/_next/static/immutable/media/pattern.1pdcsaq6rik_l.png" alt="">

Pre-built prompt for connecting Quarkus applications to Lakebase Postgres using Reactive SQL Client

[Quarkus](https://quarkus.io/) is a Java framework optimized for cloud environments. This guide shows how to connect to Neon from a Quarkus project using a Reactive SQL Client.

To connect to a Lakebase Postgres database from a Quarkus application:

:::::steps
:::step{title="Create a Neon project"}
If you do not have one already, create a Neon project.

1. Navigate to the [Projects](https://console.neon.tech/app/projects) page in the Neon Console.
2. Click **New Project**.
3. Specify your project settings and click **Create Project**.
:::

:::step{title="Create a Quarkus project"}
Create a Quarkus project using the [Quarkus CLI](https://quarkus.io/guides/cli-tooling):

```bash
quarkus create app neon-with-quarkus \
--name neon-with-quarkus \
--package-name com.neon.tech \
--extensions reactive-pg-client,resteasy-reactive
```

You now have a Quarkus project in a folder named `neon-with-quarkus` with the Reactive Postgres client and RESTEasy Reactive extensions installed.
:::

::::step{title="Configure a PostgreSQL data source"}
Create a `.env` file in the root of your Quarkus project directory. Configure a reactive data source using your database connection string and specifying the database kind as shown:

```bash
QUARKUS_DATASOURCE_REACTIVE_URL=postgresql://[user]:[password]@[neon_hostname]/[dbname]?sslmode=require&channel_binding=require
```

:::callout{intent="note"}
You can find the connection details for your database by clicking the **Connect** button in the Console nav. For more information, see [Connect from any application](/guides/postgres-connect-connect-from-any-app).
:::
::::

:::step{title="Use the Reactive PostgreSQL client"}
Create a `PostgresResource.java` file in the same directory as the `GreetingResource.java` that was generated by Quarkus during project creation. Paste the following content into the `PostgresResource.java` file:

```java
package com.neon.tech;

import jakarta.inject.Inject;
import io.smallrye.mutiny.Multi;
import io.vertx.mutiny.sqlclient.Row;
import io.vertx.mutiny.sqlclient.RowSet;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.core.MediaType;

@Path("/postgres")
public class PostgresResource {
    @Inject
    io.vertx.mutiny.pgclient.PgPool client;

    @GET
    @Path("/version")
    @Produces(MediaType.TEXT_PLAIN)
    public Multi<String> getVersion() {
        return client.query("SELECT version()")
                .execute()
                .onItem().transformToMulti(this::extractVersion);
    }

    private Multi<String> extractVersion(RowSet<Row> rowSet) {
        return Multi.createFrom().iterable(rowSet)
                .map(r -> r.getValue(0).toString());
    }
}
```

This code defines a HTTP endpoint that will query the database version and return it as a response to incoming requests.
:::

:::step{title="Run the application"}
Start the application in development mode using the Quarkus CLI from the root of the project directory:

```bash
quarkus dev
```

Visit [localhost:8080/postgres/version](http://localhost:8080/postgres/version) in your web browser. Your Neon database's Postgres version will be returned. For example:

```
PostgreSQL 17.5 (6bc9ef8) on x86_64-pc-linux-gnu, compiled by gcc (Debian 12.2.0-14+deb12u1) 12.2.0, 64-bit
```
:::
:::::

## Next steps

- [Add Object Storage](/guides/object-storage-index): S3-compatible file storage that branches with your database
- [Call an LLM with AI Gateway](/guides/ai-gateway-index): Access foundation models from Anthropic, OpenAI, Google, and more with one credential

## Need help?

Join our [Discord Server](https://neon.com/discord) to ask questions or see what others are doing with Neon. For paid plan support options, see [Support](/guides/postgres-introduction-support).

## Related pages

- [Connect Astro to Postgres on Neon](./neon-docs-guides-astro.md)
- [Connect a Bun application to Neon](./neon-docs-guides-bun.md)
- [Connect an Entity Framework application to Neon](./neon-docs-guides-dotnet-entity-framework.md)
- [Connect an Encore application to Neon](./neon-docs-guides-encore.md)
- [Connect an Express application to Neon](./neon-docs-guides-express.md)
- [Self-Host Medusa with Neon](./neon-docs-guides-medusajs.md)
- [Connect a Micronaut Kotlin application to Lakebase Postgres](./neon-docs-guides-micronaut-kotlin.md)
- [Connect a NestJS application to Neon](./neon-docs-guides-nestjs.md)
- [Connect a Next.js application to Neon](./neon-docs-guides-nextjs.md)
- [Connect a Node.js application to Neon](./neon-docs-guides-node.md)

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