Classpath for a simple class

I'm in directory A, which contains resources I need for imports, compiling
a/b/rpt.java
I do javac b/rpt.java
How do I execute it?
cd b
java rpt
gives a NoClassDefFoundException
Doing
javac -d . b/*.java
java rpt
gives the same exception
The class has no package statement.
How do I execute this class? I know that trying to cross directory boundaries is a problem, but what's the solution?

Assumming you got a clean compile from dir 'a', using:
javac b/rpt.java
... Then from 'a', again:
java b.rpt
If this does not work, you will need a classpath.

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[email protected] (Orly) writes:
Hi,
I have a very simple question:
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http://www.sun.com/developers/support.

Ideas For a Simple Program?

I need some ideas for a simple program for a project in class. Can anyone help me?

Import Classes
import java.io.*;
public class tictactoe
Define Variables
public static InputStreamReader ISR = new InputStreamReader(System.in);
public static BufferedReader BFR = new BufferedReader(ISR);
public static String BOX[][] = new String[3][3]; //Integer Arry for tictactoe box
public static String PName; //Moving Player's Name
public static String P1Name; //Player 1 Name
public static String P2Name; //Player 2 Name
public static String InputPLY; //X or O
public static String InputStr; //Player's Input
public static boolean BreakLoop; //Set this to true in PlayGame() to exit
public static void main(String args[]) throws IOException
InputPLY = "O";
BreakLoop = false;
ClearBOXCache();
PrintCredits();
System.out.println("");
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P1Name = BFR.readLine();
System.out.println("PLEASE ENTER PLAYER 2 NAME");
P2Name = BFR.readLine();
System.out.println("");
System.out.print("\nWelcome ");
System.out.print(P1Name);
System.out.print(" and ");
System.out.println(P2Name);
System.out.println("");
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System.out.println(P2Name + " = O");
PlayGame();
PrintCredits();
BFR.readLine();
System.exit(0);
public static void DrawGrid()
This function is to draw the tictactoe grid.
System.out.println("");
System.out.println("\t/-----------------------------\\");
System.out.println("\t|-------- TIC TAC TOE --------|");
System.out.println("\t|-----------------------------|");
System.out.println("\t| | | |");
System.out.println("\t| " + BOX[0][0] + " | " + BOX[0][1] + " | " + BOX[0][2] + " |");
System.out.println("\t| | | |");
System.out.println("\t|-----------------------------|");
System.out.println("\t| | | |");
System.out.println("\t| " + BOX[1][0] + " | " + BOX[1][1] + " | " + BOX[1][2] + " |");
System.out.println("\t| | | |");
System.out.println("\t|-----------------------------|");
System.out.println("\t| | | |");
System.out.println("\t| " + BOX[2][0] + " | " + BOX[2][1] + " | " + BOX[2][2] + " |");
System.out.println("\t| | | |");
System.out.println("\t\\-----------------------------/");
public static void PrintCredits()
This function is to print credits. Intended for startup and ending
System.out.println("");
System.out.println("");
System.out.println("\t-------------------------------");
System.out.println("\t--------- TIC TAC TOE ---------");
System.out.println("\t-------------------------------");
System.out.println("");
System.out.println("\t-------------------------------");
System.out.println("\t---- MADE BY WILLIAM CHAN! ----");
System.out.println("\t-------------------------------");
public static void ClearBOXCache()
This function is to clear the BOX's cache.
It is intended for restarting a game
BOX[0][0] = " ";
BOX[0][1] = " ";
BOX[0][2] = " ";
BOX[1][0] = " ";
BOX[1][1] = " ";
BOX[1][2] = " ";
BOX[2][0] = " ";
BOX[2][1] = " ";
BOX[2][2] = " ";
public static void CheckWin(String PLYW) throws IOException
This function is to check if a player wins
for (int X = 0; X < 3; X++)
if (BOX[X][0].equals(PLYW) && BOX[X][1].equals(PLYW) && BOX[X][2].equals(PLYW))
PrintWin(PLYW);
for (int Y = 0; Y < 3; Y++)
if (BOX[0][Y].equals(PLYW) && BOX[1][Y].equals(PLYW) && BOX[2][Y].equals(PLYW))
PrintWin(PLYW);
if (BOX[0][0].equals(PLYW) && BOX[1][1].equals(PLYW) && BOX[2][2].equals(PLYW))
PrintWin(PLYW);
else if (BOX[0][2].equals(PLYW) && BOX[1][1].equals(PLYW) && BOX[2][0].equals(PLYW))
PrintWin(PLYW);
else if (!BOX[0][0].equals(" ") && !BOX[0][1].equals(" ") && !BOX[0][2].equals(" ") && !BOX[1][0].equals(" ") && !BOX[1][1].equals(" ") && !BOX[1][2].equals(" ") && !BOX[2][0].equals(" ") && !BOX[2][1].equals(" ") && !BOX[2][2].equals(" "))
ClearBOXCache();
System.out.println("Tie Game!");
BFR.readLine();
System.out.println("Game has restarted");
public static void PrintWin(String PrintWinner) throws IOException
This function is to print which player won
if (PrintWinner.equals("X"))
System.out.println(P1Name + " wins!");
System.out.println(P2Name + " loses!");
else if (PrintWinner.equals("O"))
System.out.println(P2Name + " wins!");
System.out.println(P1Name + " loses!");
BFR.readLine();
ClearBOXCache();
System.out.println("Game has restarted!");
public static void PrintInstruction(String PLYINSTR)
This function is to give instruction to the player
if (PLYINSTR.equals("X"))
PName = (P1Name);
else if (PLYINSTR.equals("O"))
PName = (P2Name);
System.out.println("");
System.out.println(PName + ":");
System.out.println("PLEASE MAKE YOUR MOVE");
System.out.println("");
System.out.println("TL = TOP LEFT BOX, TM = TOP MIDDLE BOX, TR = TOP RIGHT BOX");
System.out.println("ML = MIDDLE LEFT BOX, MM = MIDDLE MIDDLE BOX, MR = MIDDLE RIGHT BOX");
System.out.println("BL = BOTTOM LEFT BOX, BM = BOTTOM MIDDLE BOX, BR = BOTTOM RIGHT BOX");
public static void PlayGame() throws IOException
This function is the main game function.
It calls other game functions.
Define Variables
while(true)
if (InputPLY.equals("O"))
InputPLY = "X";
else if (InputPLY.equals("X"))
InputPLY = "O";
while(true)
PrintInstruction(InputPLY);
InputStr = BFR.readLine(); //Player's move
Check player's move
if (InputStr.equals("TL"))
if (BOX[0][0].equals(" "))
BOX[0][0] = InputPLY;
break;
else if (InputStr.equals("TM"))
if (BOX[0][1].equals(" "))
BOX[0][1] = InputPLY;
break;
else if (InputStr.equals("TR"))
if (BOX[0][2].equals(" "))
BOX[0][2] = InputPLY;
break;
else if (InputStr.equals("ML"))
if (BOX[1][0].equals(" "))
BOX[1][0] = InputPLY;
break;
else if (InputStr.equals("MM"))
if (BOX[1][1].equals(" "))
BOX[1][1] = InputPLY;
break;
else if (InputStr.equals("MR"))
if (BOX[1][2].equals(" "))
BOX[1][2] = InputPLY;
break;
else if (InputStr.equals("BL"))
if (BOX[2][0].equals(" "))
BOX[2][0] = InputPLY;
break;
else if (InputStr.equals("BM"))
if (BOX[2][1].equals(" "))
BOX[2][1] = InputPLY;
break;
else if (InputStr.equals("BR"))
if (BOX[2][2].equals(" "))
BOX[2][2] = InputPLY;
break;
else if (InputStr.equals("RESTART"))
ClearBOXCache();
System.out.println("");
System.out.println("GAME RESTARTED!");
System.out.println("");
break;
else if (InputStr.equals("QUIT"))
BreakLoop = true;
break;
if (BreakLoop == true)
break;
DrawGrid();
CheckWin(InputPLY);
}

Can I set classpath for OAS 10g?

Hi, 
 
I have OAS on my workstation. Here are the details. 
Server : Oracle Application Server 10g Release 3 
Version : 10.1.3.1.0 SOA4 
Build : 061008.0900.00025 
Platform : Windows XP - SP2 
 
I want to set an explicit classpath for complete OAS 10g as such and not to an individual oc4j application. Will I be able to do it? 
I saw the System Properties after my server started. 
It has a name-value pair as "java.class.path oc4j.jar". 
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I appended my properties folder after all the jar files present in that tag. 
But its not loading any of my properties files. 
 
Can someone please help me out. 
 
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iam using weblogic server 10 and bea jrockit 1.5.0.12.
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Hello Julius,
yes sure, we can move this post to the NW admin forum. I have already posted similar thread on sun forums. I was hoping that someone from SAP SDN already tackled this problem and if not someone specialized in J2EE Engine could troubleshoot me from the class problem I'm getting. I don't know if it's specific from the agent or if this ClassNotFound is a general SAP J2EE Engine error relating to a library not correclty defined.
Kind regards,
Tanguy Mezzano

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This should be easy... but I've spent two days on nothing but this error.... I am absolutely at my wit's end.
Basically, I've got a "character" container linked to a MovieClip in the library that is supposed to act as a container for various body parts; head, shirt, pants, etc. For simplicity, I've just got Character class and Head class, both in a "char" package, both classes are named the same as their respective files (Character.as and Head.as, both in an actual file called "char"). Character class is supposed to create an instance of Head, but I always get this 1046 error. The problem is that I've got other body parts with nearly identical classes that ARENT throwing a 1046 error and are working just fine. I went and made a new project to see if I was still having the problem with just character calling 1 simple body part. I do.
In the symbol properties, it's Exported for Actionscript & Export in Frame 1... the class is "char.Head" and "char.Character" respectively. I have tried everything I can find or think of, I've done dozens of Google searches and sifted through dozens of forums. I can't find anything and I've been working on this problem for 24 straight working hours now. I'm completely exasperated......
package char {
import flash.display.MovieClip;
import flash.display.Stage;
import flash.display.Sprite;
import flash.events.Event;
import flash.geom.ColorTransform;
import fl.motion.Color;
import char.Head;
public class Character extends MovieClip {
// 1046: Type was not found or was not a compile-time constant: Head
private var _head:Head;
// reference to get the stage later
private var stageRef:Stage;
public function Character(stageRef:Stage=null) {
trace("NEW CHARACTER");
//1180 Call to a possibly undefined method Head;
_head=new Head();
And here's the contents of Head.as
package char {
import flash.display.MovieClip;
import flash.events.Event;
import flash.display.Stage;
import flash.geom.ColorTransform;
public class Head extends MovieClip {
private var skin_type:uint;
public function Head() {
trace ("NEW HEAD");
Now if I declare the head variable and create a new instance of it in my document class, no problem whatsoever. If I do it in my Character class, it just doesn't stop giving me this error!!! Somebody please help me.
1046: Type was not found or was not a compile-time constant: Head
1180 Call to a possibly undefined method Head;

There is a blank movieclip named Character in the library, yup.
Also in my main handler for my document class calls "mainCharacter = new Character(); "
Here's a chunk of the code from the document class. For the record, it calls "head" as just a test and that works fine. Just doesn't work in "Character"
import char.Character;
import char.Head;
public class MainHandler extends MovieClip {
private static var _instance:MainHandler;
public static function get instance():MainHandler { return _instance; }
public var mainCharacter:Character;
public var head_:Head;
public function MainHandler() {
_instance = this;
mainCharacter = new Character();
head_=new Head();

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Hi Erich,
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I've seen something like this before on a windows machine where the PATH environment variable had some additional values which contained spaces.
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%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem
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What is wrong with my simple class program?

Ok, I'm writing a simple class called 'Frog', which will keep track of the position enter by a user. The program will ask for the initial position for the frog. It will then ask for how many steps it want the frog to jump. Then it will output the new position of it. But for some reason, it doesn't work. It always output 0 for some reason.
import java.io.*;
import java.util.*;
- frog program class.
frog will start on a position.
user will be prompt to ask how many jump to forward.
public class beta
 public static void main(String args[]) throws IOException
 class Frog
 int newPos;
 int Position () //return postion of the frog
 return newPos;
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 newPos+=stepsForward;
 return newPos;
 int PrevPos(int newPos)
 return newPos-1;
 int NextPos(int newPos)
 return newPos+1;
 boolean isMagicSquare(int newPos)
 if(newPos == 5) return true;
 else return false;
 BufferedReader key = new BufferedReader(new InputStreamReader(System.in));
 Frog joe = new Frog();
 int pos = 0, stepsFoward = 0;
 //input 1-9
 do
 System.out.println("Enter a position for the frog: ");
 pos = Integer.parseInt(key.readLine()); //reads in an integer
 }while(pos < 1 || pos > 9);
 joe.PositionStart(pos); //initialize the position for the frog
 System.out.println("Pos: " + joe.Position()); //position
 System.out.println("How many steps to jump: ");
 stepsFoward = Integer.parseInt(key.readLine());
 joe.Jump(stepsFoward,joe.Position());
 System.out.println("New Position: " + joe.Position());
}

You have method argument parameters with the same name as a member variable; as in:
void PositionStart (int newPos) {
 newPos = newPos;
}You need to identify to the compiler which variable is which, class member variables in cases like this should be qualified with the this keyword; as in:
void PositionStart (int newPos) {
 this.newPos = newPos;
}Dave

How do I resolve a ClassNotFoundException for a custom class

I am new to Java and am having frustrating problems. I am creating a Desktop application and want the application to have the capability to read from the file system.
I created a custom class to hold mapping data and stored the object to file using ObjectOutputStream writeObject. I read it back into the program to make sure it worked. All was well and fine. I am trying to mimic the C capability to read and write entire data structures at a time. I ensured that the class (and all classes that it relied on) were serializable.
Now back to the Desktop app. I am trying to read the object into that same custom class in my program. The program compiles fine. I have set my classpath up in Netbeans 6.1 to look to the other apps classes, have imported the classes. Again no problem.
I also set my classpath (in the run section) to look at the jar file in the other section that contains my class. I have tried setting this runtime classpath many ways. I will get a ClassNotFoundException: MyClass at URLClassLoader ... on and on.
I really am trying to do something simple here by just reading in a structure (class in Java). I was told previously that it is a classpath problem. How can I resolve this? I don't think that I should have to write a binary or text file that contains all of the various parameters (easier to do in one hop using
MyClass c = (MyClass) in.readObject();
Help is appreciated. Jay A

jaya wrote:
I am new to Java and am having frustrating problems. I am creating a Desktop application and want the application to have the capability to read from the file system.Very good.
I created a custom class to hold mapping data and stored the object to file using ObjectOutputStream writeObject. I read it back into the program to make sure it worked. All was well and fine. I am trying to mimic the C capability to read and write entire data structures at a time. I ensured that the class (and all classes that it relied on) were serializable.I'm not sure why you think Object streams are the way to go here. Why aren't a text representation and a toString call good enough? Sounds like you just want a simple persistence mechanism without a relational database. Writing a Map of <key, value> pairs using a PrintWriter would seem enough to me and parsing each pair on a line to read it back in would seem sufficient to me.
Now back to the Desktop app. I am trying to read the object into that same custom class in my program. Why? What are you trying to do? Why can't your Desktop app instantiate an instance of the custom class and be done with it?
The program compiles fine. I have set my classpath up in Netbeans 6.1 to look to the other apps classes, have imported the classes. Again no problem.So does your NetBeans classpath include your custom class?
I also set my classpath (in the run section) to look at the jar file in the other section that contains my class. Why do you have to package the other class in a JAR? Why can't that package just be part of your current project? Or are they separate projects, and you want to treat the first one like a 3rd party JAR?
I have tried setting this runtime classpath many ways. I will get a ClassNotFoundException: MyClass at URLClassLoader ... on and on.You aren't setting CLASSPATH correctly. You don't need a URL class loader. You're making this far too complicated. It's a much easier thing than this.
I really am trying to do something simple here by just reading in a structure (class in Java). I was told previously that it is a classpath problem. How can I resolve this? I don't think that I should have to write a binary or text file that contains all of the various parameters (easier to do in one hop using
MyClass c = (MyClass) in.readObject();This is not the way to do it.
CNF exception means one thing: a .class that you need to load isn't in the CLASSPATH. That advice you got is correct. You need to figure out how to make it so.
Your description is confusing.
I think your mistake is assuming that serialization is the best way to persist that mapping data. Without knowing more about the details, I think adding two method to the "custom class" that encapsulated the mapping data should be sufficient. Create a static read() method that takes a java.io.Reader and returns a populated instance of your class. Create a static write() method that accepts a java.io.Writer and an instance of your class and returns void. Have them read and write plain text. Then either make that source code part of your NetBeans project or package it into a JAR and put that in your CLASSPATH. Either way, if you don't do it properly you'll get that CNF exception. Keep plugging until you get it right.
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Classpath for a simple class

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