public static void main(String args[]) {
    Class.forName("org.apache.hive.jdbc.HiveDriver");
    conn = DriverManager.getConnection("jdbc:hive2://<ip>:10015/default","","");
    System.out.println("Connected!");
}

!connect jdbc:hive2://127.0.0.1:10015

1300 [main] INFO  org.apache.hive.jdbc.HiveConnection  - Could not open client transport with JDBC Uri: jdbc:hive2://192.168.225.128:10015/default
java.sql.SQLException: Could not open client transport with JDBC Uri: jdbc:hive2://192.168.225.128:10015/default: java.net.ConnectException: Connection refused: connect
at org.apache.hive.jdbc.HiveConnection.openTransport(HiveConnection.java:215)
at org.apache.hive.jdbc.HiveConnection.<init>(HiveConnection.java:163)
at org.apache.hive.jdbc.HiveDriver.connect(HiveDriver.java:105)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:247)