# dropAlias()

A MilvusClient interface. This method drops an alias for the specified collection.

```Java
R<RpcStatus> dropAlias(DropAliasParam requestParam);
```

## DropAliasParam

Use the `DropAliasParam.Builder` to construct a `DropAliasParam` object.

```Java
import io.milvus.param.DropAliasParam;
DropAliasParam.Builder builder = DropAliasParam.newBuilder();
```

Methods of `DropAliasParam.Builder`:

| Method                    | Description                                                  | Parameters                  |
| ------------------------- | ------------------------------------------------------------ | --------------------------- |
| `withAlias(String alias)` | Sets the collection alias. The alias cannot be empty or null. | `alias`: The alias to drop. |
| `build()`                 | Constructs a `DropAliasParam` object.                      |   N/A                       |

The `DropAliasParam.Builder.build()` can throw the following exceptions:

- `ParamException`: error if the parameter is invalid.

## Returns

This method catches all the exceptions and returns an `R<RpcStatus>` object.

- If the API fails on the server side, it returns the error code and message from the server.

- If the API fails by RPC exception, it returns `R.Status.Unknow` and the error message of the exception.

- If the API succeeds, it returns `R.Status.Success`.

## Example

```Java
import io.milvus.param.*;

DropAliasParam param = DropAliasParam.newBuilder()
        .withAlias("alias1")
        .build();
R<RpcStatus> response = client.dropAlias(param)
if (response.getStatus() != R.Status.Success.getCode()) {
    System.out.println(response.getMessage());
}
```