Java send to EventHub (不能正常关闭)

import com.microsoft.azure.eventhubs.*;

public class EventHubSender {
    private static final String connectionString = "YOUR_EVENTHUB_CONNECTION_STRING";
    private static final String eventHubName = "YOUR_EVENTHUB_NAME";

    public static void main(String[] args) throws Exception {
        ConnectionStringBuilder connStrBuilder = new ConnectionStringBuilder()
                .setConnectionString(connectionString)
                .setEventHubName(eventHubName);

        EventHubClient eventHubClient = EventHubClient.createFromConnectionStringSync(connStrBuilder.toString());

        try {
            String message = "Hello, EventHub!";
            EventData eventData = EventData.create(message.getBytes("UTF-8"));

            eventHubClient.sendSync(eventData);
            System.out.println("Message sent successfully.");
        } finally {
            eventHubClient.closeSync();
        }
    }
}

try {
    // 发送数据
} catch (Exception e) {
    // 处理异常
} finally {
    eventHubClient.closeSync();
}

ConnectionOptions connectionOptions = new ConnectionOptions();
connectionOptions.setOperationTimeout(Duration.ofSeconds(30));
EventHubClient eventHubClient = EventHubClient.createFromConnectionStringSync(connStrBuilder.toString(), connectionOptions);