我在cloudera集群上安装了ApachePhoenix。我正在尝试连接到数据库并运行一些简单的sql命令。我的代码在下面。我正在本地创建一个可执行jar文件，并在集群上运行它。
我收到以下警告。有人知道他们是什么吗。

log4j:WARN No appenders could be found for logger (org.apache.hadoop.conf.Configuration.deprecation).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

package mysqljbdctest;
import java.sql.*
public class PhoenixJDBC {

public static void main(String args[]) {

String connectionURL = "jdbc:phoenix:52.153.31.118:2181,52.153.111.8:2181,52.134.169.130:2181";

try {
    //Register JDBC Driver
    Class.forName("org.apache.phoenix.jdbc.PhoenixDriver").newInstance();

    Connection conn = DriverManager.getConnection("jdbc:phoenix:54.154.34.128","","");

    //Create a Statement class to execute the SQL statement
    Statement stmt = conn.createStatement();

    //Execute the SQL statement and get the results in a Resultset
    ResultSet rs = stmt.executeQuery("select * from STOCK_SYMBOL");

    // Iterate through the ResultSet, displaying two values
    // for each row using the getString method

    while (rs.next())
        System.out.println("Name= " + rs.getString("host"));
}
catch (SQLException e) {
    e.printStackTrace();
}
catch (Exception e) {
    e.printStackTrace();
}
}
}