use java to dump mysql database

I am using Ubuntu. I want to use java application to dump the MySQL database.

Below are my code:

String userName = "root";
String userPassword = "root";
String oldDatabaseName = "testing";

String executeCommand = "";
executeCommand = "mysqldump -u "+userName+" -p"+userPassword+" --no-data "       
+OldDatabaseName+" > testingbackup.sql"; 

Process runtimeProcess = Runtime.getRuntime().exec(executeCmd);
int processComplete = runtimeProcess.waitFor();

if(processComplete == 0){
    System.out.println("Backup successful.");
}else{
    System.out.println("Backup failed.");
}

But, when I run the above program, I always get the "Backup failed" message.
Am I writing the wrong code? And what library/file I need to include in my java application?
Any help please.

Copyright License：
Author:「KKL Michael」,Reproduced under the CC 4.0 BY-SA copyright license with link to original source & disclaimer.
Link to：https://stackoverflow.com/questions/30623495/use-java-to-dump-mysql-database