Win a copy of Modern JavaScript for the Impatient this week in the Server-Side JavaScript and NodeJS forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Ron McLeod
  • Paul Clapham
  • Bear Bibeault
  • Junilu Lacar
Sheriffs:
  • Jeanne Boyarsky
  • Tim Cooke
  • Henry Wong
Saloon Keepers:
  • Tim Moores
  • Stephan van Hulst
  • Tim Holloway
  • salvin francis
  • Frits Walraven
Bartenders:
  • Scott Selikoff
  • Piet Souris
  • Carey Brown

Trying to instantiate my middle tier class??see code

 
Ranch Hand
Posts: 116
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Headache I am try to instantiate this class below

this is the first line of codes in my client application it keeps on throwing remote exception yet I am connecting locally any suggestions I can get my application to work with another middle tier but I was extending data I dont want to that>........

//global variable
private DataClient myInstance11;

public client()
{
try
{
myInstance11 = new dataConnectImpl("C:\\scjd\\starting\\client\\db.db");
}
catch(RemoteException e)
{
System.out.println("OH not again");
}
.
.
.
.
//end client class
exception "OH not again" is being thrown all the time ???
//here is my middle tier class to handle local and Remote see below it has all the methods of the DataClient Interface see Below...............................

import java.io.*;
import java.util.*;
import suncertify.db.Data;
import suncertify.db.DataClient;
import java.rmi.*;
import java.rmi.server.UnicastRemoteObject;
public class dataConnectImpl extends UnicastRemoteObject implements DataClient
{
private Data InstanceOne;
public dataConnectImpl(String dbName)throws DatabaseException,RemoteException
{
super();
try
{
System.out.println("Im here before");
InstanceOne = new Data(dbName);
System.out.println("Im here after");
}
catch(Exception ex)
{
System.out.println("Error Creating Instance in DataClientLocal");
}
}
public FieldInfo [] getFieldInfo()throws RemoteException
{
FieldInfo[] info = null;
try
{
info = InstanceOne.getFieldInfo();
}
catch(Exception e)
{
}
return info;
}
.
.
.
.
.
.
.
.
}end class
Thanks in advance Lisa
 
Lisa Foster
Ranch Hand
Posts: 116
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
here my interface for the previous error
package suncertify.db;
import java.io.*;
import java.util.*;
import java.rmi.*;
import java.rmi.Remote;
import suncertify.db.DataInfo;
import suncertify.db.FieldInfo;
public interface DataClient extends Remote
{
public FieldInfo [] getFieldInfo()throws RemoteException;
public DataInfo getRecord(int recNum)throws DatabaseException,RemoteException;
public DataInfo find(String toMatch)throws DatabaseException, RemoteException;
public void add(String [] newData)throws DatabaseException,RemoteException;
public void modify(DataInfo newData)throws DatabaseException, RemoteException;
public void delete(DataInfo toDelete)throws DatabaseException, RemoteException;
public void close() throws RemoteException;
public void lock(int record)throws IOException, RemoteException;
public void unlock(int record)throws RemoteException;
public DataInfo[] criteriaFind(String criteria)throws DatabaseException, RemoteException;
public String[] getComboValues(int fieldNum) throws DatabaseException, RemoteException;
public int getRecordCount() throws RemoteException;
}
 
Ranch Hand
Posts: 334
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Please try:
1) myInstance11 = new dataConnectImpl("C:\scjd\starting\client\db.db");
2) All data methods in the interface regarding data class should throw DatabaseException.
Hope to help.
Ruilin
 
Lisa Foster
Ranch Hand
Posts: 116
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I tryed it no luck
Thanks AnyWay
Lisa
 
Ranch Hand
Posts: 477
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Lisa: I was trying to send you an e-mail but you haven�t got one in your profile because this isn�t so important for being in a post.
I am seing a lot of posts from you with java code, I recomend you to use the code tag "[code]" (see the UBB help at the left of you window when you are editing a message) it will be more readable.
Thanks
 
Ranch Hand
Posts: 40
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I, too, got stuck with rmi. I tried to fix the code based on some textbooks. However, the information may have been dated--there are changes in the latest jdks with respect to rmi.
I then decided to focus on the latest rmi tutorial from sun. After getting that to work, next I plan to make the appropriate changes in the assignment code.
Also, the posted code does not follow the coding standards. Class names should start with a upper case character and instances should start with a lower case character.

------------------
--glenn
 
ruilin yang
Ranch Hand
Posts: 334
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Lisa,
Please check the file permission setting in your policy file.
I got everything work now.
In the code you should use:
1) myInstance11 = new dataConnectImpl("C:\scjd\starting\client\db.db");
In the policy file you should use "C:\\scjd\\starting\\client\\db.db";
Please try.
Ruilin
 
girl power ... turns out to be about a hundred watts. But they seriuosly don't like being connected to the grid. Tiny ad:
Building a Better World in your Backyard by Paul Wheaton and Shawn Klassen-Koop
https://coderanch.com/wiki/718759/books/Building-World-Backyard-Paul-Wheaton
    Bookmark Topic Watch Topic
  • New Topic