Problems to connect MongoDB from JAVA

I am working in Text Mining with articles from Medline. I have indexed all Medline2011 with MongoDB (http://www.mongodb.org/), now I can get one article with its PubMedID. I want join it with UIMA (http://uima.apache.org/), and I have created the DescriptorReader to get the article String from MongoDB (using MondoDB Driver for JAVA). I have this code (a quick example) and works:

public static void main(String[] args) throws UnknownHostException, MongoException {
    Mongo m = new Mongo("localhost", 27017);
    DB db = m.getDB(DB_NAME);
    DBCollection coll = db.getCollection(COLLECTION_NAME);

    BasicDBObject query = new BasicDBObject();      
    String pmid = "6889938";       
    query.put("_id", pmid);

    DBObject myDoc = coll.findOne(query);

    System.out.println(myDoc);  
}

But, when I try write the same code in a project with UIMA I have the next error:

When I use:

    private String getAbstractXMLFromMongoDB(String pmid) throws UnknownHostException, MongoException{      
        Mongo m = new Mongo(); // <-----ERROR
        ...
        return "something"

The error in console is:

ThreadGroup.uncaughtException()-Got Error
    java.lang.NoClassDefFoundError: com/mongodb/Mongo
...

And if I use try/catch:

    private String getAbstractXMLFromMongoDB(String pmid){      
    try {
        Mongo m = new Mongo(); // <-----ERROR
        ...
    } catch (UnknownHostException e) {
        e.printStackTrace();
    } catch (MongoException e) {
        e.printStackTrace();
    }
    return "something"

The error in console is:

Exception in thread "Thread-5" java.lang.NoClassDefFoundError: com/mongodb/MongoException
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
...

I have tried (in the Example code) access to MongoDB with 100 threads at once and works... I do not know and do not undertands what is happening...

Any suggestions?

thx.开发者_开发技巧

Provide the mongo libs to your classpath and the error should be gone.

Your try/catch approach would work, if you remove the MongoException (this one isn't known by your classpath, jars missing) and replace it with a generic Exception

If you are developing in eclipse just add the mongo jars to your buildpath. I don't know UIMA but that shouldn't matter