ProcessBuilder and RunTime.exec not running my in code

Question

I'm coding one application for my mongodb server in java, and I need to:

1 - Start my Mongo DB server (in terminal it is: "mongod")

2 - Access the Mongo and drop one collection (executing in terminal: "mongo", "use my_db" and "db.user_coll.drop()")

3 - Import the new collection (in terminal: "mongoimport --db my_db--collection user_coll --file user_coll"

I can make all this in terminal, but when i tried to run from Java, using ProcessBuilder or getRunTime.exec(), don't work :(

This is my code:

String DBPath ="";

if(args.length<=3) {
 System.out.println("Localizando collection em " + System.getProperty("user.home") + "/Desktop/");
 DBPath = System.getProperty("user.home") + "/Desktop/";
}
else { 
 String LastChar = 
 Character.toString(args[3].charAt(args[3].length()-1));
 if (LastChar == "/") {
  System.out.println("Localizando collection em " + args[3]);
  DBPath = args[3];
 }
 else{
  System.out.println("Localizando collection em " + args[3] + "/");
  DBPath = args[3]+ "/";
 }
}

File f = new File(DBPath + "user_coll");
if(f.isFile()) {
 System.out.println("Collection localizada, iniciando servidor MongoDB e derrubando a collection atual...");
 ProcessBuilder proc = new ProcessBuilder(new String[] {"/bin/bash", "-c", "mongod"});
 proc.start().waitFor();
 String echo = "cd "+ System.getProperty("user.dir")+ " && mongo < mongodbscript.js";
 Process proc2 = new ProcessBuilder(new String[] {"bash","-c", echo}).start();
 System.out.println("Importando nova collection...");
 Process proc3 = new ProcessBuilder(new String[] {"bash", "-c", "cd " + DBPath + " && mongoimport --db my_db --collection user_coll --file user_coll"}).start();
 System.out.println("Collection importada...");
}
else {
 System.out.println("Nova collection não localizada, iniciando servidor MongoDB com a collection existente");
 Process proc = new ProcessBuilder(new String[] {"bash", "-c", "mongod"}).start();
}

Answer 1

I have been working with this problem in MacOS and I found a workaround.

I add the complete path of the mongoimport command to the exec command:

Runtime r  = Runtime.getRuntime();

Process p = r.exec(path + command);

where path = "/Users/'myname'/Documents/mongoInstallation/bin" and comand = "mongoimport"