"cannot find symbol" error while compiling the RMI

I am trying to implement a simple RMI.
I have the following :
1. HelloInterface which has the SayHello method defined.
2. HelloImpl which has the implementation of Say Hello
3. Server code
4. Client code
the HelloInterface compiles properly.
but when i say javac HelloImpl
package rmisample;
import java.rmi.*;
import java.rmi.server.UnicastRemoteObject;
import java.rmi.RemoteException;
public class HelloImpl extends UnicastRemoteObject implements HelloInterface{ --> this is where i get the error
/** Creates a new instance of HelloImpl */
public HelloImpl()throws RemoteException {
super();
public String SayHello(String s) throws RemoteException
return "hello" +s;
I get the following error:
C:\Myjava\RMISample\src\rmisample>javac HelloImpl.java
HelloImpl.java:18: cannot find symbol
symbol: class HelloInterface
public class HelloImpl extends UnicastRemoteObject implements HelloInterface{
All 4 files are in the same directory.
Am not sure what is going wrong and am new to this.
Edited by: topcatin on Sep 14, 2007 6:52 AM

The problem is probably that the compiler can't find the file with that class definition.
Try changing your javac call so that is starts off
javac -classpath .
The dot is important!
If it works, then go read up on classpaths.

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      System.out.println(" I'm thinking of a number between 0 and 9....");
      while(true)
        p1.guess();
        p2.guess();
        p3.guess();
        guessp1 = p1.number;
        System.out.println("Player one guessed " + guessp1);
        guessp2 = p2.number;
        System.out.println("Player two guessed " + guessp2);
        guessp3 = p3.number;
        System.out.println("Player three guessed " + guessp3);
        if (guessp1 == targetNumber)
          p1isRight = true;
        if (guessp2 == targetNumber)
          p2isRight = true;
        if (guessp3 == targetNumber)
          p3isRight = true;
        if ( p1isRight || p2isRight || p3isRight)
          System.out.println("We have a winner ! ");
          System.out.println("Player one got it right? " + p1isRight);
          System.out.println("Player two got it right? " + p2isRight);
          System.out.println("Player three got it right? " + p3isRight);
          System.out.println("Game is over ! ");
          break; //game is over so break out of loop
        else
          //we must keep going because no one guessed the number !
          System.out.println(" Players will have to try again ! ");
        } // end of if/else
      } // end of loop
    } // end of startGame() method
    } //end of class
    public class Player
      int number = 0;   // the guess is stored here
      public void guess()
        System.out.println(" I'm guessing " + number);
    ---------------------------------------------------------------  

    Thank you . You were right . I didn't set up the classes correctly.
    I corrected a few other errors and the program runs ok !
    Below is the corrected code and the output
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      public static void main(String[] args)
       GuessGame game = new GuessGame();
       game.startGame();
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    I'm thinking of a number between 0 and 3....
    I'm guessing 1
    I'm guessing 3
    I'm guessing 0
    Player one guessed 1
    Player two guessed 3
    Player three guessed 0
    We have a winner !
    Player one got it right? true
    Player two got it right? false
    Player three got it right? false
    Game is over !
    public class Player
      int number = 0;   // the guess is stored here
      public void guess()
        number = (int)(Math.random() * 4);
        System.out.println(" I'm guessing " + number);
    public class GuessGame
      public void startGame()
        int x = 0;
      Player p1 = new Player();
      Player p2 = new Player();
      Player p3 = new Player();
      int guessp1 = 0;
      int guessp2 = 0;
      int guessp3 = 0;
      boolean p1isRight = false;
      boolean p2isRight = false;
      boolean p3isRight = false;
      int targetNumber = (int) (Math.random() * 4);
      System.out.println("\n I'm thinking of a number between 0 and 3....\n");
      while(x <5)
        p1.guess();
        p2.guess();
        p3.guess();
        guessp1 = p1.number;
        System.out.println("\nPlayer one guessed " + guessp1);
        guessp2 = p2.number;
        System.out.println("Player two guessed " + guessp2);
        guessp3 = p3.number;
        System.out.println("Player three guessed " + guessp3);
        if (guessp1 == targetNumber)
          p1isRight = true;
        if (guessp2 == targetNumber)
          p2isRight = true;
        if (guessp3 == targetNumber)
          p3isRight = true;
        if ( p1isRight || p2isRight || p3isRight)
          System.out.println("\nWe have a winner ! ");
          System.out.println("Player one got it right? " + p1isRight);
          System.out.println("Player two got it right? " + p2isRight);
          System.out.println("Player three got it right? " + p3isRight);
          System.out.println("Game is over ! ");
          break; //game is over so break out of loop
        else
          //we must keep going because no one guessed the number !
          System.out.println(" Players will have to try again ! ");
        } // end of if/else
        x = x + 1;
      } // end of loop
    } // end of startGame() method
    } //end of class 

  • Need help with class info and cannot find symbol error.

    I having problems with a cannot find symbol error. I cant seem to figure it out.
    I have about 12 of them in a program I am trying to do. I was wondering if anyone could help me out?
    Here is some code I am working on:
    // This will test the invoice class application.
    // This program involves a hardware store's invoice.
    //import java.util.*;
    public class InvoiceTest
         public static void main( String args[] )
         Invoice invoice1 = new Invoice( "1234", "Hammer", 2, 14.95 );
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         System.out.println("Original invoice information" );
         System.out.println("Part number: ", invoice1.getPartNumber() );
         System.out.println("Description: ", invoice1.getPartDescription() );
         System.out.println("Quantity: ", invoice1.getQuantity() );
         System.out.println("Price: ", invoice1.getPricePerItem() );
         System.out.println("Invoice amount: ", invoice1.getInvoiceAmount() );
    // change invoice1's data
         invoice1.setPartNumber( "001234" );
         invoice1.setPartDescription( "Yellow Hammer" );
         invoice1.setQuantity( 3 );
         invoice1.setPricePerItem( 19.49 );
    // display invoice1 with new data
         System.out.println("Updated invoice information" );
         System.out.println("Part number: ", invoice1.getPartNumber() );
         System.out.println("Description: ", invoice1.getPartDescription() );
         System.out.println("Quantity: ", invoice1.getQuantity() );
         System.out.println("Price: ", invoice1.getPricePerItem() );
         System.out.println("Invoice amount: ", invoice1.getInvoiceAmount() );
    and that uses this class file:
    public class Invoice
    private String partNumber;
    private String partDescription;
    private int quantityPurchased;
    private double pricePerItem;
         public Invoice( String ID, String desc, int purchased, double price )
              partNumber = ID;
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         if ( purchased >= 0 )
         quantityPurchased = purchased;
         if ( price > 0 )
         pricePerItem = price;
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         return quantityPurchased * pricePerItem;
    public void setPartNumber( String newNumber )
         partNumber = newNumber;
         System.out.println(partDescription+" has changed to part "+newNumber);
    public String getPartNumber()
         return partNumber;
    public void setDescription( String newDescription )
         System.out.printf("%s now refers to %s, not %s.\n",
    partNumber, newDescription, partDescription);
         partDescription = newDescription;
    public String getDescription()
         return partDescription;
    public void setPricePerItem( double newPrice )
         if ( newPrice > 0 )
    pricePerItem = newPrice;
    public double getPricePerItem()
    return pricePerItem;
    Any tips for helping me out?

    System.out.println("Part number:
    "+invoice1.getPartNumber;
    The + sign will concatenate invoice1.getPartNumber()
    after "Part number: " forming only one String.I added the plus sign and it gives me more errors:
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    InvoiceTest.java:16: operator + cannot be applied to java.lang.String
            System.out.println("Part number: ",   + invoice1.getPartNumber() );
                                                  ^
    InvoiceTest.java:17: cannot find symbol
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            System.out.println("Description: ", + invoice1.getPartDescription() );
                                                          ^
    InvoiceTest.java:17: cannot find symbol
    symbol  : method println(java.lang.String,int)
    location: class java.io.PrintStream
            System.out.println("Description: ", + invoice1.getPartDescription() );
                      ^
    InvoiceTest.java:18: cannot find symbol
    symbol  : method getQuantity()
    location: class Invoice
            System.out.println("Quantity: ", + invoice1.getQuantity() );
                                                       ^
    InvoiceTest.java:18: cannot find symbol
    symbol  : method println(java.lang.String,int)
    location: class java.io.PrintStream
            System.out.println("Quantity: ", + invoice1.getQuantity() );
                      ^
    InvoiceTest.java:19: cannot find symbol
    symbol  : method println(java.lang.String,double)
    location: class java.io.PrintStream
            System.out.println("Price: ", + invoice1.getPricePerItem() );
                      ^
    InvoiceTest.java:20: cannot find symbol
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    location: class java.io.PrintStream
            System.out.println("Invoice amount: ", + invoice1.getInvoiceAmount() );
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    InvoiceTest.java:24: cannot find symbol
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    location: class Invoice
            invoice1.setPartDescription( "Yellow Hammer" );
                    ^
    InvoiceTest.java:25: cannot find symbol
    symbol  : method setQuantity(int)
    location: class Invoice
            invoice1.setQuantity( 3 );
                    ^
    InvoiceTest.java:30: operator + cannot be applied to java.lang.String
            System.out.println("Part number: ", + invoice1.getPartNumber() );
                                                ^
    InvoiceTest.java:31: cannot find symbol
    symbol  : method getPartDescription()
    location: class Invoice
            System.out.println("Description: ", + invoice1.getPartDescription() );
                                                          ^
    InvoiceTest.java:31: cannot find symbol
    symbol  : method println(java.lang.String,int)
    location: class java.io.PrintStream
            System.out.println("Description: ", + invoice1.getPartDescription() );
                      ^
    InvoiceTest.java:32: cannot find symbol
    symbol  : method getQuantity()
    location: class Invoice
            System.out.println("Quantity: ", + invoice1.getQuantity() );
                                                       ^
    InvoiceTest.java:32: cannot find symbol
    symbol  : method println(java.lang.String,int)
    location: class java.io.PrintStream
            System.out.println("Quantity: ", + invoice1.getQuantity() );
                      ^
    InvoiceTest.java:33: cannot find symbol
    symbol  : method println(java.lang.String,double)
    location: class java.io.PrintStream
            System.out.println("Price: ", + invoice1.getPricePerItem() );
                      ^
    InvoiceTest.java:34: cannot find symbol
    symbol  : method println(java.lang.String,double)
    location: class java.io.PrintStream
            System.out.println("Invoice amount: ", + invoice1.getInvoiceAmount() );
                      ^
    16 errors

  • Cannot find symbol error. don't know why

    Hello, I'm trying to write a button bean in the shape of a triangle but netbeans keeps throwing up a cannot find symbol error at my g.fillPolygon line. I've declared the number of sides and x and y coords.
    Any ideas as to why this is happening would be greatly appreciated.
    Here's the code:
    package trianglebutton;
    import java.util.*;
    import java.awt.event.*;
    import java.awt.*;
    import javax.swing.*;
    import java.io.*;
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    private Color buttonColour;
    private Color textColour;
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    private int sides = 3;
    private int size = 30;
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    private int centerY = 100;
         public TriangleButtonBean()
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              setPreferredSize(new Dimension(50,50));
              setBorder(null);
              buttonColour = Color.red;
              textColour = Color.black;
              caption = "";
         public TriangleButtonBean(String acaption)
              super();
              setPreferredSize(new Dimension(50,50));
              setBorder(null);
              caption = acaption;
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    String astring;
              super.paintComponent(g);
    g.setColor(buttonColour);
              int centerX = graphicPolygon.getCenterX(); //Invoking getCenterX method
              int centerY = graphicPolygon.getCenterY(); //Invoking getCenterY method
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              //int Ycoordinates [] = graphicPolygon.getPolygonYCoordinates(sides,size);
    g.drawPolygon(centerX,centerY, sides); //Draw polygon using xcoord,ycoord and number of sides
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                   astring = caption.substring(0,1);
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              buttonColour = acolour;
              repaint();
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              return buttonColour;
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              textColour = acolour;
              repaint();
         public Color getTextColour()
              return textColour;
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              caption = acaption;
              repaint();
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    // public void setCenterX(int xcoords)
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    // public void setCenterY(int ycoords)
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    TriangleButtonBean agui = new TriangleButtonBean();
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    Please READ, STUDY, and UNDERSTAND the error messages, they are telling you exactly what the problem is:
    . . .\TriangleButtonBean.java:56: cannot find symbol
    symbol  : method drawPolygon(int,int,int)
    location: class java.awt.Graphics
    g.drawPolygon(centerX,centerY, sides); //Draw polygon using xcoord,ycoord and number of sides
    ^
    . . .\TriangleButtonBean.java:57: cannot find symbol
    symbol  : method fillPolygon(int,int,int)
    location: class java.awt.Graphics
    g.fillPolygon(centerX,centerY, sides); //Fill poly
    ^
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    Process javac exited with code 1In both cases the messages ar telling you that the methods
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  • Please help with cannot find symbol error. Been struggling all day :(

    Hi all. :)
    Writing a game for my phone with KToolbar and have been getting a cannot find symbol error for every variable and method I try to use across Classes. I've looked all over and though it seems a common problem I always either don't understand or can't get working the various solutions. Example of my errors:
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              ^
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    Here's my code, it's long enough to be a tiresome read so I've tried to skip what I know isn't relevant.
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            //a whole bunch more skipped here, but I'm fairly certain it's not anything that'll help find a solution
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                   youSayWhat=0;
                           //again with the skipping, more code not related
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    //whole bunch of code
    //other methods skipped
    class HelloCanvas extends Canvas {
         public void keyPressed (int key) {
              youSayWhat=key;
              repaint ();
    //skippage
    }The stuff I skipped is mainly either more of the same sorta thing or maths/writing to screen stuff.
    Thanks alot to anyone who helps. I'm really struggling with this. :(
    Dan.

    But I have been reading them :(
    My next-door neighbour unfortunately is an 80-something married man, but I will go have a looksie about static and instances.
    I thought the point of public variables was that other classes could use them, is this wrong?
    Also does this mean that to use the variables from my BTK class in the HelloCanvas class I need to first instantiate BTK? I don't understand how that works as the code starts running from the BTK class in the first place :S I guess more reading will help with this.
    Thanks very much for replying. :)
    Edit:
    OK I have read up on it but I don't think I found anything I hadn't read before. I tried to make a new class which I could instantiate to hold all the variables and methods I wanted everything to be able to access, but that went disastrously. Am I right in understanding that there are no global variables in Java? :s
    Edited by: Dan69 on Apr 17, 2010 1:15 PM

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