Java Error when running mongodb program

[Zhongli Wu]

Hi All,

I've written the basic MongoDB driver program using Java. 

I use driver 2.13.0 to compile the code on Ubuntu 14.04: 

javac App.java -classpath mongo-java-driver-2.13.0.jar

import com.mongodb.BasicDBObject;
import com.mongodb.BulkWriteOperation;
import com.mongodb.BulkWriteResult;
import com.mongodb.Cursor;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;
import com.mongodb.ParallelScanOptions;
import com.mongodb.MongoException;
import com.mongodb.ServerAddress;


import java.util.List;
import java.util.Set;


public class App
{
    public static void main(String[] args)
    {
 System.out.println("----- Program Start -----");
 try {
 MongoClient mongoClient = new MongoClient("localhost" , 27017);
 DB db = mongoClient.getDB("demo");
 System.out.println("Connect to database successfully.");
 
 DBCollection coll = db.getCollection("test");
 BasicDBObject doc = new BasicDBObject();
 for(int i = 0; i < 10; i++) {
 doc.append("A" + Integer.toString(i), 12.56);
 }
 
 System.out.println(doc);
 } catch (Exception e) {
 System.err.println(e.getClass().getName() + ": ");
 e.getMessage();
 }
    }
}

It compiles all well with no error but when I run the program error happens:

----- Program Start -----
Exception in thread "main" java.lang.NoClassDefFoundError: com/mongodb/MongoClient
 at App.main(App.java:23)
Caused by: java.lang.ClassNotFoundException: com.mongodb.MongoClient
 at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
 at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
 ... 1 more

This will also happens when I build the program using Maven.

I've tried Oracle Java 1.6 and 1.7 to compile the code. But the same error happened.

Could anyone please help? Thanks!

[Jeff Yemin]

You say you compiled like this:

   javac App.java -classpath mongo-java-driver-2.13.0.jar

How did you try to run it?

Regards,

Jeff

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