Mongodb connection issue with java

i am having mongoDB connections issue in java , this is my connection class

    public MongoDbUtil() {
    try {
       System.out.println("1");
    String host = "127.0.0.1"  ; 
    String dbName = "m_prod" ; 
    int port =27017 ; 
       System.out.println("2");
    Mongo m = new Mongo();
       System.out.println("3");
    ds = new Morphia().createDatastore(m,dbName);
       System.out.println("4");
    ds.ensureIndexes(); 
       System.out.println("5");
    ds.ensureCaps();
       System.out.println("1");
    } catch(Exception e) {
       System.out.println("catch");            
    }finally{
       System.out.println("finally");
       System.out.println(ds==null);
    } }

only 1 and 2 is printing, after that 'finally' is printing also 'ds' is null, there is no any exception happen ('catch' is not printing)

Mongo server is up and running and i can access from command prompt (Linux) , the Other interesting thing is, its working fine when i call this method by unit test function, but for all other cases above issue happen , what can be the reason ?

Thanks