Question

我想使用java程序连接到服务器上的hive数据库。下面是java的代码：

import java.sql.SQLException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.DriverManager;


public class HiveQueryJava {

   private static String driverName = "org.apache.hadoop.hive.jdbc.HiveDriver";

   public static void main(String[] args) throws SQLException {

      // Register driver and create driver instance
      Class.forName(driverName);


      // get connection
      Connection con = DriverManager.getConnection("jdbc:hive -hiveconf mapred.job.queue.name=queuename://ip:port/dbname", "uname", "");

      // create statement
      Statement stmt = con.createStatement();

      // execute statement
      Resultset res = stmt.executeQuery("SELECT pincode FROM pincode_city_map LIMIT 5;");

      System.out.println("Result:");

      while (res.next()) {
         System.out.println(res.getString(1));
      }
      con.close();
   }
}

我为4个NoClassFoundExceptions添加了3个jar文件。 jar文件是：

hive-service-0.11.0.jar
libthrift-0.8.0.jar
hive-jdbc-0.10.0.jar
hive-metastore-0.10.0

现在获得新的NoClassFoundException，如下所示：

Exception in thread "main" java.lang.NoClassDefFoundError: com/facebook/fb303/FacebookService$Iface
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at org.apache.hadoop.hive.jdbc.HiveDriver.connect(HiveDriver.java:104)
        at java.sql.DriverManager.getConnection(DriverManager.java:664)
        at java.sql.DriverManager.getConnection(DriverManager.java:247)
        at HiveQueryJava.main(HiveQueryJava.java:21)
Caused by: java.lang.ClassNotFoundException: com.facebook.fb303.FacebookService$Iface
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 40 more

每次出现此异常时，我都要搜索此类并下载jar文件。是否有任何主jar文件包含所有用于连接到hive数据库的jar？

最后我想通过java程序连接到hive。任何人都可以提供不同的代码或建议其他方式来解决这个问题吗？

Answer 1

CLASSPATH中缺少libfb * - * .jar。请确保CLASSPATH中包含的必要罐子的版本正确且没有任何重复。

以下页面可能有所帮助，

http://docs.aws.amazon.com/ElasticMapReduce/latest/DeveloperGuide/HiveJDBCDriver.html https://cwiki.apache.org/confluence/display/Hive/HiveServer2+Clients#HiveServer2Clients-JDBCClientSampleCode

Answer 2

如果您正在使用hortonworks，他们已经捆绑了所有的罐子......您可以使用以下两个罐子连接： - http://repo.hortonworks.com/content/repositories/releases/org/apache/hadoop/hadoop-common/2.7.1.2.3.2.0-2950/hadoop-common-2.7.1.2.3.2.0-2950.jar http://repo.hortonworks.com/content/repositories/releases/org/apache/hive/hive-jdbc/1.2.1.2.3.2.0-2950/hive-jdbc-1.2.1.2.3.2.0-2950-standalone.jar

此外，您只能连接配置单元服务器2，因此您的连接字符串应该如下所示，使用hive2而不是配置单元。

 Connection con = DriverManager.getConnection("jdbc:hive2://hadoopip:10000/database","username", "password");

错误通过java程序连接到hive数据库

2 个答案: