# Java SDK Data Import

You can import the data from your Java applications, using Treasure Data’s Java SDK.

## Prerequisites

- Basic knowledge of Java.
- Basic knowledge of Maven2.
- Basic knowledge of Treasure Data.
- Java 6 or higher (for local testing).


## Install td-logger-java Library

Add the following lines to your `pom.xml`. Replace `myVersion` with your version. The logger library’s version information can be found in [CHANGES.txt](https://github.com/treasure-data/td-logger-java/blob/master/CHANGES.txt).


```
<dependencies>
  ...
  <dependency>
    <groupId>com.treasuredata</groupId>
    <artifactId>td-logger</artifactId>
    <version>myVersion</version>
  </dependency>
  ...
</dependencies>
```

If you need an all-in-one jar file, we provide one at https://repo1.maven.org/maven2/com/treasuredata/.

## Modify Your App

The td-logger-java library comes with a built-in library for recording in-app events. Insert the following code to record events from your app. Further details regarding the event logger API can be found in the GitHub repository [td-logger-java](https://github.com/treasure-data/td-logger-java).

`YOUR_API_KEY` should be your actual apikey string. You can retrieve your API key from the TD Console.


```
import com.treasure_data.logger.TreasureDataLogger;
public class Main {
  private static TreasureDataLogger LOG;
  static {
    try {
      Properties props = System.getProperties();
      props.load(Main.class.getClassLoader().getResourceAsStream("treasure-data.properties"));
      LOG = TreasureDataLogger.getLogger("production");
    } catch (IOException e) {
      // do something
    }
  }
  public void doApp() {
    Map<String, Object> data = new HashMap<String, Object>();
    data.put("from", "userA");
    data.put("to", "userB");
    LOG.log("follow", data);
  }
}
```

Your event-logging code should be placed near its corresponding event-generating code.

When using the `td-logger-java` library, the posted records are buffered in the memory locally at first, and the data is uploaded every 5 minutes. Because a dedicated thread uploads the data into the cloud, it doesn’t affect your application’s response time.

The local buffer also has a size limit. If the local data exceeds this limit, the records will be uploaded immediately.

## Confirming Data Import

The data gets uploaded every 5 minutes. You can confirm the data import from TD Console or CLI.

**From TD Console**

To confirm that your data has been uploaded successfully, check your dataset from the TD Console.

**From CLI**

Issue the `td tables` command if you have the [TD Toolbelt](https://docs.treasuredata.com/display/PD/Installing+and+Updating+TD+Toolbelt+and+Treasure+Agent) CLI.


```
$ td tables
+------------+------------+------+-----------+
| Database   | Table      | Type | Count     |
+------------+------------+------+-----------+
| production | follow     | log  | 1         |
+------------+------------+------+-----------+
```