log4j警告連接到apache Phoenix數據庫

Question

我在一個cloudera集群上安裝了Apache Phoenix。 我正在嘗試連接到數據庫並運行一些簡單的SQL命令。 我的代碼如下。 我在本地創建一個可執行jar文件並在集群上運行它。

我收到以下警告。 有人會知道它們是什么嗎？

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();
}
}
}

Answer 1

在類路徑中添加log4j.xml或log4j.properties並重試，對於獨立Java應用程序，請確保log4j.properties文件位於project / classes目錄下對於Java Web應用程序，請確保log4j.properties文件位於WEB-下面的INF / classes目錄是一個示例

# Root logger option
log4j.rootLogger=DEBUG, stdout, file 
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss}   %-5p %c{1}:%L - %m%n