Error importing classes
I was in the process of altering the environment variables so that i could successfully use some classes under JDOM, but i actually managed to accidently delete a value in the path variable but forgot what it was and because of this my Visual studio and Java development environments were affected.
I was not able to compile any java program, but i have set the path for it and it now compiles.
Here comes the catch:
I have a java class that uses another class in the same directory, and as we know we are not required to import the class. But when i compile it says symbol not found when i create an instance.
It worked before i fiddled with the paths, is there any way i can sort this out?
I was in the process of altering the environment
variables so that i could successfully use some
classes under JDOM, but i actually managed to
accidently delete a value in the path variable but
forgot what it was and because of this my Visual
studio and Java development environments were
affected.Strange. Because IDEs usually don't give a damn about environment variables.
I was not able to compile any java program, but i
have set the path for it and it now compiles.
Here comes the catch:
I have a java class that uses another class in the
same directory, and as we know we are not required to
import the class. But when i compile it says symbol
not found when i create an instance.How do you compile?
It worked before i fiddled with the paths, is there
any way i can sort this out?Not before you tell us what you did.
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"Rahul Srivastava" <[email protected]> wrote:
>
Hi,
We are generating java classes for the COM dll using JCOM com2java compiler.
We are getting a compilation error for import class not found when compiling
the
generated Proxy java source code. It can't find the com.bea.jcom.Dispatch
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Any help on the compilation error..I tried changing the extends for Dispatch
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but the other errors are still there.
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yzme yzme
Message was edited by:
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Hi,
I have two swing applications that run perfectly well when compiled and run. But then I am trying to include these two programs as two tabbed panes in a third program.
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Thanks in advance.OK here is the code. This is a example code from the book Java2 from scratch
First file
PortfoilioTotalsPanel.java
// Import the packages used by this class
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
// PortfolioTotalsPanel Class
public class PortfolioTotalsPanel extends JPanel
// Define the dark green color
public final static Color darkGreen = new Color( 0, 150, 40 );
// Create our labels
JLabel lblDollarChange = new JLabel( "Dollar Change:", JLabel.CENTER );
JLabel lblPercentChange = new JLabel( "Percent Change:", JLabel.CENTER );
// Constructor
public PortfolioTotalsPanel()
// Set the layout manager
setLayout( new GridLayout( 2, 1 ) );
// Add the labels to the JPanel
add( lblDollarChange );
add( lblPercentChange );
// setDollarChange( fDollarChange )
// Set the Dollar Change label to the dollar amount in fDollarChange
public void setDollarChange( Float fDollarChange )
// Set color based off of value
if( fDollarChange.floatValue() > 0 )
// Green for positive
lblDollarChange.setForeground( darkGreen );
else if( fDollarChange.floatValue() < 0 )
// Red for negative
lblDollarChange.setForeground( Color.red );
else
// Black for no change
lblDollarChange.setForeground( Color.black );
// Set the label text
lblDollarChange.setText( "Dollar Change: $" + fDollarChange.toString() );
// setPercentChange( fPercentChange )
// Set the Percent Change label to the percent in fDollarChange
public void setPercentChange( Float fPercentChange )
// Set color based off of value
if( fPercentChange.floatValue() > 0 )
// Green for positive
lblPercentChange.setForeground( darkGreen );
else if( fPercentChange.floatValue() < 0 )
// Red for negative
lblPercentChange.setForeground( Color.red );
else
// Black for no change
lblPercentChange.setForeground( Color.black );
// Set the label text
lblPercentChange.setText( "Percent Change: " + fPercentChange.toString() + "%" );
// Main application entry point into this class
public static void main( String[] args )
// Create a JFrame object
JFrame frame = new JFrame( "Portfolio Totals" );
// Create an PortfolioTotalsPanel Object
PortfolioTotalsPanel app = new PortfolioTotalsPanel();
// Set the values of the labels
app.setDollarChange( new Float( "-150.50" ) );
app.setPercentChange( new Float( "15" ) );
// Add our PortfolioTotalsPanel Object to the JFrame
frame.getContentPane().add( app, BorderLayout.CENTER );
// Resize our JFrame
frame.setSize( 600, 100 );
// Make our JFrame visible
frame.setVisible( true );
// Create a window listener to close our application when we
// close our application
frame.addWindowListener
new WindowAdapter()
public void windowClosing( WindowEvent e )
System.exit( 0 );
Second Program
// ===========================================================================
// File: StockTablePanel.java
// Description: Sample file for Java 2 From Scratch
// ===========================================================================
// Import the libraries this application will use
import javax.swing.JTable;
import javax.swing.table.*;
import javax.swing.JScrollPane;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import java.awt.*;
import java.awt.event.*;
// Main application class: StockTablePanel
public class StockTablePanel extends JPanel
// Create a new Stock Table Model object
StockTableModel stockTableModel = new StockTableModel();
// Create a new JTable and associate it with the StockTableModel
JTable stockTable = new JTable( stockTableModel );
// Constructor
public StockTablePanel()
// Set the size of the table
stockTable.setPreferredScrollableViewportSize( new Dimension(620, 350) );
// Set the column widths for the table
TableColumn column = null;
for (int i = 0; i < 5; i++)
column = stockTable.getColumnModel().getColumn( i );
column.setPreferredWidth( stockTableModel.getColumnWidth( i ) );
// Create a scroll pane and add the stock table to it
JScrollPane scrollPane = new JScrollPane( stockTable );
// Add the scroll pane to our panel
add( scrollPane, BorderLayout.CENTER );
// float getDollarChange()
// Computes the total dollar change for the current portfolio
public float getDollarChange()
// Create a variable to hold the total change for all stocks
float fTotal = 0;
// Loop through all rows in the table
for( int i=0; i<stockTable.getRowCount(); i++ )
// Retrieve the dollar change for this stock
Float f = ( Float )stockTable.getValueAt( i, 10 );
// Add that value to our total
fTotal = fTotal + f.floatValue();
// Return the total value
return fTotal;
// float getPercentChange()
// Computes the total percentage change for the current portfolio
public float getPercentChange()
// Create a couple variables to hold the total the user spent
// on the stocks and the current value of those stocks
float fMoneySpent = 0;
float fMoneyWorth = 0;
// Loop through all rows in the table
for( int i=0; i<stockTable.getRowCount(); i++ )
// Extract some pertinent information for the computations
Float fLastSale = ( Float )stockTable.getValueAt( i, 2 );
Float fNumberOfShares = ( Float )stockTable.getValueAt( i, 6 );
Float fPricePaidPerShare = ( Float )stockTable.getValueAt( i, 7 );
// Add the amount of money the user spent on this stock
// to the total spent
fMoneySpent += fNumberOfShares.floatValue() * fPricePaidPerShare.floatValue();
// Add the value of this stock to the total value of the
// stock
fMoneyWorth += fNumberOfShares.floatValue() * fLastSale.floatValue();
// Compute the percentage change:
// TotalValue/TotalSpent * 100% - 100%
float fPercentChange = ( (fMoneyWorth / fMoneySpent) * 100 ) - 100;
// Return the percentage change
return fPercentChange;
// Main entry point into the StockTableApplication class
public static void main( String[] args )
// Create a frame to hold us and set its title
JFrame frame = new JFrame( "StockTablePanel Application" );
// Create an instance of our stock table panel
StockTablePanel stockTablePanel = new StockTablePanel();
// Add our tab panel to the frame
frame.getContentPane().add( stockTablePanel, BorderLayout.CENTER );
// Resize the frame
frame.setSize(640, 480);
// Make the windows visible
frame.setVisible( true );
// Set up a window listener to close the application window as soon as
// the application window closes
frame.addWindowListener
new WindowAdapter()
public void windowClosing( WindowEvent e )
System.exit( 0 );
// Table Model Class - holds all of our row and column information
class StockTableModel extends AbstractTableModel
// Create the columns for the table
final String[] strArrayColumnNames =
"Sym",
"Company Name",
"Last",
"Hi",
"Lo",
"Vol",
"#Shares",
"$Shares",
"Total",
"%Change",
"$Change"
// Create the rows for the table - hard coded for now!!
final Object[][] obArrayData =
// Row One
"SAMS", // Symbol
"Sams Publishing", // Company Name
new Float( 10 ), // Last Sale
new Float( 12 ), // High
new Float( 8 ), // Low
new Double( 2000000 ), // Volume
new Float( 100 ), // Number of Shares Owned
new Float( 7.5 ), // Purchase price per share
new Float( 1000 ), // Total Holdings
new Float( 33 ), // Percent change (increase!)
new Float( 250 ) // Dollar change
// Row Two
"Good", // Symbol
"Good Company", // Company Name
new Float( 50 ), // Last Sale
new Float( 52 ), // High
new Float( 45 ), // Low
new Double( 4000000 ), // Volume
new Float( 100 ), // Number of Shares Owned
new Float( 30 ), // Purchase price per share
new Float( 5000 ), // Total Holdings
new Float( 33 ), // Percent change (increase!)
new Float( 250 ) // Dollar change
// Row Three
"BAD", // Symbol
"Bad Company", // Company Name
new Float( 20 ), // Last Sale
new Float( 22 ), // High
new Float( 18 ), // Low
new Double( 2000000 ), // Volume
new Float( 500 ), // Number of Shares Owned
new Float( 50 ), // Purchase price per share
new Float( 10000 ), // Total Holdings
new Float( -60 ), // Percent change (increase!)
new Float( -25000 ) // Dollar change
// Return the number of columns in the table
public int getColumnCount()
return strArrayColumnNames.length;
// Return the number of rows in the table
public int getRowCount()
return obArrayData.length;
// Get the column name from the strArrayColumnNames array for the "col"-th
// item
public String getColumnName( int col )
return strArrayColumnNames[col];
// Return the value, in the form of an Object, from the obArrayData object
// array at position (row, col)
public Object getValueAt( int row, int col )
// We will compute columns 8, 9, and 10, so if the column number is
// below eight, we can just return it without computing or retrieving
// anything.
if( col < 8 )
return obArrayData[row][col];
// Retrive the necessary values from the object array to compute all
// of the remaining columns
Float fLastSale = ( Float )obArrayData[row][2];
Float fNumberOfShares = ( Float )obArrayData[row][6];
Float fPurchasePrice = ( Float )obArrayData[row][7];
switch( col )
// Total Holdings = Last Sale(2) * Number of Shares Owned(6)
case 8:
// Build a new Float object with the product of the two
Float fTotal = new Float
// Note, these have to be converted to type "float" to
// perform the multiplication
fLastSale.floatValue() * fNumberOfShares.floatValue()
// Return the result
return( fTotal );
// Percent change =
// (Last Sale Price (2) / Purchase Price (7)) * 100% - 100 %
case 9:
Float fPercentChange = new Float
((fLastSale.floatValue() / fPurchasePrice.floatValue ()) * 100) - 100
return fPercentChange;
// Dollar Change =
// LastSale*NumberOfShares - PurchasePrice * NumberOfShares
case 10:
Float fDollarChange = new Float
( fLastSale.floatValue() * fNumberOfShares.floatValue() )
( fPurchasePrice.floatValue() * fNumberOfShares.floatValue() )
return fDollarChange;
// We have included every case so far, but in case we add another
// column and forget about it, let's just return its value
default:
return obArrayData[row][col];
// Return the class type, in the form of a Class, for the c-th column in
// the first (0-th indexed) element of the obArrayData object array
public Class getColumnClass( int c )
return getValueAt(0, c).getClass();
// Return true if the "col"-th column of the table is editable, false
// otherwise. The following columns are editable:
// Cell Description
// 0 Symbol
// 6 Number of Shares Owned
// 7 Purchase Price per Share
public boolean isCellEditable(int row, int col)
// Check the column number
if( col == 0 || col == 6 || col == 7 )
return true;
else
return false;
// Set the value of the (row, col) element of the obArrayData to value
public void setValueAt(Object value, int row, int col)
// Symbol
if( col == 0 )
// We need a string value - we can convert any
// value to a string, so just assign it
obArrayData[row][col] = value;
// Number of Shares owned
else if( col == 6 )
// We need a number - either float or int
obArrayData[row][col] = new Float( getNumberString( value.toString() ) );
// Purchase Price per share
else if( col == 7 )
// We need a float
obArrayData[row][col] = new Float( getNumberString( value.toString() ) );
// Cell is not editable
else
return;
// Notify our parent of the change
fireTableCellUpdated(row, col);
// String getNumberString( String str )
// Read through str and return a new string with the numbers and decimal
// points contained in str
public String getNumberString( String str )
// Get str as a character array
char[] strSource = str.toCharArray();
// Create a buffer to copy the results into
char[] strNumbers = new char[strSource.length];
int nNumbersIndex = 0;
// Boolean to ensure we only have one decimal value
// in our number
boolean bFoundDecimal = false;
// Loop through all values of str
for( int i=0; i<strSource.length; i++ )
// Check for a digit or decimal point
if( Character.isDigit( strSource[i] ) )
strNumbers[nNumbersIndex++] = strSource;
else if( strSource[i] == '.' && !bFoundDecimal )
// Append the character to the String
strNumbers[nNumbersIndex++] = strSource[i];
// Note that we found the decimal value
bFoundDecimal = true;
// Build a new string to return to our caller
String strReturn = new String( strNumbers, 0, nNumbersIndex );
// Return our string
return strReturn;
// Return the column width of the column at index nCol
public int getColumnWidth( int nCol )
switch( nCol )
case 0:
case 2:
case 3:
case 4:
case 6:
case 7:
case 9:
return 50;
case 1:
return 125;
default:
return 75;
Third one that imports the previous two programs Classes
// Import the packages used by this class
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
// Import our other components
import StockTablePanel;
import PortfolioTotalsPanel;
// StockTableTabPanel
public class StockTableTabPanel extends JPanel implements TableModelListener
// Create our panels
StockTablePanel stockTablePanel = new StockTablePanel();
PortfolioTotalsPanel portfolioTotalsPanel = new PortfolioTotalsPanel();
// Constructor
public StockTableTabPanel()
// Set our layout
setLayout( new BorderLayout() );
// Initialize the portfolio panel
updatePortfolioTotals();
// Add the child panels to our JPanel
add( stockTablePanel );
add( portfolioTotalsPanel, BorderLayout.SOUTH );
// Add our class as a table model listener for the stock table
// model so that we can update the portfolio totals panel
// whenever the table changes.
stockTablePanel.stockTableModel.addTableModelListener( this );
// TableModelListener: tableChanged
public void tableChanged(TableModelEvent e)
// Make sure it is our table that changed
if( e.getSource() == stockTablePanel.stockTableModel )
// Call our method to update the portfolio totals
updatePortfolioTotals();
// public updatePortfolioTotals
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// in the stockTablePanel
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// Get the values from the stockTablePanel and send them
// to the portfolioTotalsPanel
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portfolioTotalsPanel.setPercentChange( new Float( stockTablePanel.getPercentChange() ) );
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frame.setVisible( true );
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// close our application
frame.addWindowListener
new WindowAdapter()
public void windowClosing( WindowEvent e )
System.exit( 0 ); -
Importing classes, package, Jamlab, JAMA
Hello:
I am using, inside a JSP, a modified version of this code --> http://www.developer.com/java/other/article.php/806711, which uses a package named JAMA and Jamlab(to work with matrix) --> http://www.developer.com/java/other/article.php/762441
It is already recognizing the JAMA package (basic linear algebra package), after I added the Jama.jar file path to the CLASSPATH.
I was trying to import the Jamlab classes and I thought that I could do the same: add to the CLASSPATH the Jamlab.jar path.
The download did not come with a .JAR file, I did it using the JAR command: adding the classes to it. I already checked that the classes are actually inside the .JAR, not in a sub-folder.
The compiler is not recognizing a method which is found inside the Jamlab package:
//Create matrix of the coefficients.
polyCoeffMatrix = new Matrix(JElmat.convertTo2D(polynomialCoefficients));
"JElmat cannot be resolved" is the error message.
The import directive of my JSP page:
<%@page import="java.io.*,java.lang.*, java.util.*, java.awt.*, java.awt.image.*, Jama.*, Jama.util.*, jamlab.*, jamlab.JElmat.*"%>Any help is extremely appreciated!Yes they are in the same folder with 'package graphs;' in the 1st line,
i've tried with and without package.class to no avail
the exact errors i'm getting are
without the package in front
error: File .\CustomLabel.class does not contain type CustomLabel as expected, but type graphs.CustomLabel. Please remove the file or make sure it appears in the correct subdirectory of the class path
with the graphs.CustomLabel i get the following errors
error: Invalid class File formate: .\graphs\CustomLabel.class, wrong version: 46, expected 45
2nd error: Class graphs.CustomLabel not found in import. -
MDL1261: Error importing OBJECT_CATALOG
I am getting an error when importing a change to a process flow from our staging environment to production. The change I made was adding assigns to the process flow. The import only fails on this process flow I am able to import other process flows and maps. Now I am getting this error when I import:
Error occurred importing from file "C:\oracle\OWB103\owb\bin\admin\DAILY_STG_DATA2_PF.mdl".
Error at line 795: MDL1261: Error importing OBJECT_CATALOG THE_SSI_DW.
Detailed Error Message:
2nd class object CMPNameInfo@35f542/id=3536194/type=CMPPhysicalObject/name=null not loaded into cache. Need to load its first class object first. Please contact Oracle Support with the stack trace and details on how to reproduce it.
Anybody have any ideas on how to fix this?Did you do a lot of edits on the flow to get it to the state it is in now? It looks like some information is messed up. If you try making the changes from your base state and then retrying might work around it, but thats a guess.
Cheers
David -
Problem with Player class: Error: (28) class Player not found
Hi,
I had this error while attempting to use the Player object of media package. I am using JDeveloper 3.2
Error: (28) class Player not found in class lyee.Frame5.
My program code has this shape.
import java.awt.event.*;
import java.applet.*;
import java.net.*;
import java.io.*;
import javax.media.*;
public class Frame5 extends JFrame {
FlowLayout flowLayout = new FlowLayout();
JPanel jPanel1 = new JPanel();
Player lecteur;
Could someone help me finding where the error is exactly. The Player object is in javax.media pakcage, right ? Is there any librarary missing ??
Thank you
JaouharIf you haven't done so already, you have to install JMF -- Java Media Framework, which you can download from the Sun website ( http://java.sun.com ). After that, you have to add that library to your project, in your project settings dialog.
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