# Java

The Java SDK talks to `antd` over REST by default and also exposes async and gRPC clients.

## Install

```kotlin
dependencies {
    implementation("com.autonomi:antd-java:0.1.0")
}
```

## Connect to the daemon

```java
import com.autonomi.antd.AntdClient;

try (var client = new AntdClient()) {
    var health = client.health();
    System.out.println(health.network());
}
```

The SDK also provides `AsyncAntdClient` and `GrpcAntdClient`.

## Store and retrieve data

```java
import com.autonomi.antd.AntdClient;

public class QuickStart {
    public static void main(String[] args) throws Exception {
        try (var client = new AntdClient()) {
            var result = client.dataPutPublic("Hello, Autonomi!".getBytes());
            System.out.println(result.address());

            byte[] data = client.dataGetPublic(result.address());
            System.out.println(new String(data));
        }
    }
}
```

## Type mappings

| Autonomi type  | Java type                               |
| -------------- | --------------------------------------- |
| `HealthStatus` | `com.autonomi.antd.models.HealthStatus` |
| `PutResult`    | `com.autonomi.antd.models.PutResult`    |
| Raw data       | `byte[]`                                |

## Error handling

```java
try {
    byte[] data = client.dataGetPublic("bad-address");
} catch (com.autonomi.antd.NotFoundException e) {
    System.out.println("Data not found");
} catch (com.autonomi.antd.PaymentException e) {
    System.out.println("Insufficient funds");
} catch (com.autonomi.antd.AntdException e) {
    System.out.println(e.getMessage());
}
```

## Full API reference

For all available daemon endpoints, see the [REST API](/developers/sdk/install/reference/rest-api.md).


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