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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import com.mongodb.*;
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
 
		// maven dep  required:
		/*
		<dependency>
        	<groupId>org.mongodb</groupId>
        	<artifactId>mongo-java-driver</artifactId>
        	<version>2.11.3</version>
        </dependency>
 
		*/
 
		String MONGO_URI = "mongodb://cyril:cccc1111@ds053978.mongolab.com:53978/jfx";
		MongoClient m = new MongoClient(new MongoClientURI(MONGO_URI));
		DBCollection coll = m.getDB("jfx").getCollection("tests.foo");
 
		//invoking dynamically 
		// http://a...content-available-to-author-only...b.org/java/current/com/mongodb/DBCollection.html#find(com.mongodb.DBObject)
 
		//works
		Object obj = coll.getClass().getMethod("find").invoke(coll, new Object[]{});
        System.out.println(obj);
 
		//fails with java.lang.IllegalArgumentException: wrong number of arguments
		Object obj2 = coll.getClass().getMethod("find").invoke(coll, new Object[]{(DBObject) new BasicDBObject("a", 2)});
        System.out.println(obj2);
 
	}
}

Main.java:6: error: package com.mongodb does not exist
import com.mongodb.*;
^
Main.java:16: error: cannot find symbol
		MongoClient m = new MongoClient(new MongoClientURI(MONGO_URI));
		^
  symbol:   class MongoClient
  location: class Ideone
Main.java:16: error: cannot find symbol
		MongoClient m = new MongoClient(new MongoClientURI(MONGO_URI));
		                    ^
  symbol:   class MongoClient
  location: class Ideone
Main.java:16: error: cannot find symbol
		MongoClient m = new MongoClient(new MongoClientURI(MONGO_URI));
		                                    ^
  symbol:   class MongoClientURI
  location: class Ideone
Main.java:17: error: cannot find symbol
		DBCollection coll = m.getDB("jfx").getCollection("tests.foo");
		^
  symbol:   class DBCollection
  location: class Ideone
Main.java:27: error: variable obj is already defined in method main(String[])
		Object obj = coll.getClass().getMethod("find").invoke(coll, new Object[]{(DBObject) new BasicDBObject("a", 2)});
		       ^
Main.java:27: error: cannot find symbol
		Object obj = coll.getClass().getMethod("find").invoke(coll, new Object[]{(DBObject) new BasicDBObject("a", 2)});
		                                                                          ^
  symbol:   class DBObject
  location: class Ideone
Main.java:27: error: cannot find symbol
		Object obj = coll.getClass().getMethod("find").invoke(coll, new Object[]{(DBObject) new BasicDBObject("a", 2)});
		                                                                                        ^
  symbol:   class BasicDBObject
  location: class Ideone
8 errors

Standard output is empty