HELP - - - Longest ERROR MESSAGE

Question

G-to-the-RIZZLE 0 Newbie Poster

17 Years Ago

Could potentially have the longest error message EVER and have no idea how to solve it ....
Exception in thread "AWT-EventQueue-0" java.lang.Error: Unresolved compilation problems:
The import java.sql cannot be resolved
The import javax cannot be resolved
Connection cannot be resolved to a type
Statement cannot be resolved to a type
ResultSet cannot be resolved to a type
Implicit super constructor Object() is undefined. Must explicitly invoke another constructor
String cannot be resolved to a type
Class cannot be resolved
Connection cannot be resolved to a type
DriverManager cannot be resolved
Statement cannot be resolved to a type
Connection cannot be resolved to a type
ResultSet cannot be resolved
ResultSet cannot be resolved
Exception cannot be resolved to a type
JOptionPane cannot be resolved
String cannot be resolved to a type
String cannot be resolved to a type
System cannot be resolved
Statement cannot be resolved to a type
ResultSet cannot be resolved to a type
Statement cannot be resolved to a type
ResultSetMetaData cannot be resolved to a type
ResultSet cannot be resolved to a type
Exception cannot be resolved to a type
JOptionPane cannot be resolved
String cannot be resolved to a type
String cannot be resolved to a type
ResultSet cannot be resolved to a type
ResultSet cannot be resolved to a type
String cannot be resolved to a type
String cannot be resolved to a type
String cannot be resolved to a type
ResultSet cannot be resolved to a type
ResultSet cannot be resolved to a type
System cannot be resolved
ResultSet cannot be resolved to a type
ResultSet cannot be resolved to a type
System cannot be resolved
Exception cannot be resolved to a type
JOptionPane cannot be resolved
String cannot be resolved to a type
String cannot be resolved to a type
System cannot be resolved
Statement cannot be resolved to a type
ResultSet cannot be resolved to a type
Statement cannot be resolved to a type
Exception cannot be resolved to a type
JOptionPane cannot be resolved
ResultSetMetaData cannot be resolved to a type
ResultSet cannot be resolved to a type
System cannot be resolved
String cannot be resolved to a type
String cannot be resolved to a type
System cannot be resolved
Exception cannot be resolved to a type
JOptionPane cannot be resolved
String cannot be resolved to a type
String cannot be resolved to a type
System cannot be resolved
Statement cannot be resolved to a type
ResultSet cannot be resolved to a type
Statement cannot be resolved to a type
Exception cannot be resolved to a type
JOptionPane cannot be resolved
ResultSetMetaData cannot be resolved to a type
ResultSet cannot be resolved to a type
String cannot be resolved to a type
String cannot be resolved to a type
System cannot be resolved
System cannot be resolved
Exception cannot be resolved to a type
JOptionPane cannot be resolved

at QueryFetcher.<init>(QueryFetcher.java:2)
at LController.getData(LController.java:274)
at LController.actionPerformed(LController.java:95)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
at javax.swing.AbstractButton.doClick(AbstractButton.java:337)
at LController.<init>(LController.java:41)
at Login.loginLevel(Login.java:159)
at Login.actionPerformed(Login.java:109)
at javax.swing.JTextField.fireActionPerformed(JTextField.java:492)
at javax.swing.JTextField.postActionEvent(JTextField.java:705)
at javax.swing.JTextField$NotifyAction.actionPerformed(JTextField.java:820)
at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1636)
at javax.swing.JComponent.processKeyBinding(JComponent.java:2849)
at javax.swing.JComponent.processKeyBindings(JComponent.java:2884)
at javax.swing.JComponent.processKeyEvent(JComponent.java:2812)
at java.awt.Component.processEvent(Component.java:5815)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4410)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1848)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:697)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:962)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:834)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:661)
at java.awt.Component.dispatchEventImpl(Component.java:4282)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Window.dispatchEventImpl(Window.java:2429)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)

any ideas??

java:swing

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8 Replies
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17 Hours Discussion Span
Latest Post 17 Years Ago Latest Post by G-to-the-RIZZLE

Dani AI

Generated 11 Months Ago

That stack trace means you are running code that did not actually compile. The smoking guns are the lines saying String/System/JOptionPane cannot be resolved and the “Implicit super constructor Object() is undefined” message. That combo almost always happens when a project accidentally defines a package named java or javax, or defines its own class named Object (or Class/System/String), which then hides the real JDK types. ’s tiny test working suggests your JDK install is fine; the problem is local to this project. The JLS explicitly reserves package names starting with java for the platform, so using them in your code will break lookups like java.lang.String and javax.swing.JOptionPane. (docs.oracle.com) Also, if your code ends up extending a non-JDK Object that lacks a no-arg constructor, you will see exactly that implicit super constructor error. (docs.oracle.com)

Quick fix checklist (tie this to where your error starts: QueryFetcher.<init>):

Open every source file (especially QueryFetcher) and check the first line. If you see package java... or package javax..., rename the package to something like com.yourname.library and move files accordingly. Recompile everything. (docs.oracle.com)
Search your project for files named Object.java, Class.java, System.java, or String.java. If found, rename them to non-conflicting names and update references. Rebuild the whole project (BlueJ: Compile all).
If QueryFetcher uses a third-party JDBC driver, make sure the jar is on BlueJ’s classpath. You can add libraries via Preferences > Libraries, or by placing the jar in BlueJ’s userlib or a project “+libs” folder. (bluej.org)

Once compilation issues are gone, a quick hardening tip for the filters : prefer PreparedStatement to string concatenation so quotes and wildcards are handled safely:

try (Connection c = DriverManager.getConnection(url);
     PreparedStatement ps = c.prepareStatement(
         "SELECT * FROM QryBooks WHERE Firstname LIKE ?")) {
  ps.setString(1, "%" + firstname + "%");
  try (ResultSet rs = ps.executeQuery()) { /* render table */ }
}

All 8 Replies

masijade 1,351 Industrious Poster

17 Years Ago

Post the command you ran that gave the error.

VernonDozier 2,218 Posting Expert

17 Years Ago

Code tags please. You can edit your post and add them.

[code=JAVA] // paste code here

[/code]

So it compiles fine and those are run-time errors?

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G-to-the-RIZZLE 0 Newbie Poster · Answer 1 · 2009-03-24T04:37:04+00:00

i have 9 classes which all compile in bluej but when i run it and after i log in all this messages come up but i dont know where its coming from.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.text.DecimalFormat;
import java.sql.*;
import java.util.Date;
import java.text.SimpleDateFormat;


public class LController implements ActionListener
{
DecimalFormat df = new DecimalFormat("###.00");
private LibraryGUI libg;
private String user;
private ChPwGUI cpwg;
private NewBookGUI nbg ;
private TakeOutLoanGUI tol;
private QueryFetcher qF;
private Store Storage;
private int selectedId = -1;
String bookname;
String authorf;
String authors;




    public LController(String LLoginName, int level)
    {
        // initialise instance variables
        user = LLoginName;
        nbg= new NewBookGUI(user);
        tol = new TakeOutLoanGUI(user);
        libg = new LibraryGUI(level, user);
        libg.addLibraryGUIActionListeners(this);//register controller as listener to bank GUI
        WindowQuitter wquit = new WindowQuitter();      // create quit object using inner class to close window
        libg.addLibraryWindowListener(wquit);
        if (level < 8) libg.jmiChangeLogin.setEnabled(false);
        if (level < 8) libg.jmiTakeLoan.setEnabled(false);
        libg.jmiViewAllBooks.doClick();
        libg.setVisible(true);


    }
    public void openLogin()
    {
        Login log = new Login(); 
        log.setLocation(100,100);
        log.setSize(350,250);
        log.setVisible(true);  
        System.out.println("New login window.");
    }//end openLogin
    public void openChPwGUI()
    {
        cpwg = new ChPwGUI(user);
        cpwg.addChangePasswordActionListeners(this);
        cpwg.setLocation(30,30);
        cpwg.setSize(350,250);
        cpwg.setVisible(true);  
        System.out.println("New change password window for user: " + user);
    }
    public void openNewBookGUI()
    {
        nbg = new NewBookGUI(user);
        nbg.addNewBookActionListeners(this);
        nbg.setLocation(30,30);
        nbg.setSize(480,220);
        nbg.setVisible(true); 
    }
    public void openTakeOutLoanGUI()
    {
        tol = new TakeOutLoanGUI(user);
        tol.addTakeOutLoanActionListeners(this);
        tol.setLocation(50,50);
        tol.setSize(480,220);
        tol.setVisible(true);
    }


    /**
     *methods
     */



    public void actionPerformed(ActionEvent ae) 
    {
        Object source = ae.getSource();
        //Filters from the "Tool Bar"       
        if (source == libg.jmiViewAllBooks)
        { 
            System.out.println("View All Books");
            String sql="Select * from tblBook";
            getData(sql,"All Books");
            System.out.println(sql);
        }

        if (source == libg.jmiFilterByFAuthor)
        { 
            System.out.println("filter By Author Firstname");
            String Firstname = JOptionPane.showInputDialog(libg,"Firstname: ","Library - Filter by Firstname");
            String sql="SELECT * FROM QryBooks WHERE Firstname LIKE '%" + Firstname + "%'"; 
            System.out.println("Firstname = " + Firstname);
            getData(sql,"All Books matching Firstname containing " + Firstname);     
            System.out.println(sql);
        }

        if (source == libg.jmiFilterBySAuthor)
        { 
            System.out.println("filter By Author Surname");
            String Surname = JOptionPane.showInputDialog(libg,"Surname: ","Library - Filter by surname");
            String sql="SELECT * FROM QryBooks WHERE Surname LIKE '%" + Surname + "%'"; 
            System.out.println("Surname = " + Surname);
            getData(sql,"All books matching Surname containing " + Surname);
        }

        if (source == libg.jmiFilterBySeries)
        { 
            System.out.println("filter By Series Name");
            String SeriesName = JOptionPane.showInputDialog(libg,"Series: ","Library - Filter by Series");
            String sql="SELECT * FROM QryBooks WHERE SeriesName LIKE '%" + SeriesName + "%'"; 
            System.out.println("Series = " + SeriesName);
            getData(sql,"All Series containing " + SeriesName);
        }

        if (source == libg.jmiFilterByTakenOut)
        { 
            System.out.println("filter By Taken Out (1)");
            int TakenOut = 1;
            String sql="SELECT * FROM QryBooks WHERE TakenOut =" + TakenOut; 
            System.out.println("Loans = " + TakenOut);
            getData(sql,"All loans containing " + TakenOut);
        }
//          if(source == libg.jmiFilterByNOL)
//         {
//            System.out.println("filter By Number of Loans");
//            int NOLcompare = 0;
//            String sql ="SELECT * FROM QryBooks WHERE NOL >" + NOLcompare;
//            getData(sql,"All loans >" + NOLcompare);
//         }
        if (source == libg.jmiChangeLogin)
        {
            System.out.println("Edit login button clicked");
            openChPwGUI();           
        }

        if (source == libg.jmiExit)
        { 
            System.out.println("password Quit button clicked");
            System.out.println("logging out. Closing Library.");
            openLogin();     
            libg.dispose();
        }

        if (source == libg.jbtPrint)
        { 
            System.out.println("print button clicked");
            try
            {
                libg.lTable.print();
            }
            catch (java.awt.print.PrinterException pl)
            { //if there is a run-time printing error, print message and trace
                pl.printStackTrace();
                System.out.print("Jtable print FAILED :- error - " + pl.getMessage() );
            }//end of catch block
        }



        if (source == libg.jmiNewBook)
        { 
            System.out.println("New Book Button pressed");
            openNewBookGUI();           
        }

        if (source == libg.jmiTakeLoan)
        {
            System.out.println("Take Out Loan");
            openTakeOutLoanGUI();
        }
        if (source == libg.jmiQuit)
        {
            System.out.println("logging out. Library closed.");
            openLogin();     
            libg.dispose();
        }

        else if (source == tol.jbTakeOut)
       {    bookname = tol.jtfBookName.getText();
           authorf = tol.jtfAuthorFName.getText();
           authors = tol.jtfAuthorSName.getText();
           Store.changeLoanStatus(bookname, authorf, authors);
           Storage.closeConnection();
        }

        else if (cpwg !=null && source == cpwg.jbSubmit)
        {
            System.out.println("cpwg = " + cpwg);
            System.out.println("password GUI submit button clicked");

            tryNewPassword();
        }
        else if (cpwg !=null && source == cpwg.jbCancel)
        {
            System.out.println("cpwg = " + cpwg);
            System.out.println("password GUI cancel button clicked");
            cpwg.jpfOPassword.setText("");
            cpwg.jpfN1Password.setText("");
            cpwg.jpfN2Password.setText("");
            cpwg.jpfOPassword.requestFocus();
        }
       else if (cpwg !=null && source ==cpwg.jbQuit)
        {
            System.out.println("cpwg = " + cpwg);
            System.out.println("password Quit button clicked");     
            cpwg.dispose();
        }
        else if (cpwg !=null && source ==cpwg.jpfOPassword)
        {
            System.out.println("cpwg = " + cpwg);
            System.out.println("old password text field <enter>");
            cpwg.jpfN1Password.requestFocus();
        }
        else if (cpwg !=null && source ==cpwg.jpfN1Password)
        {
            System.out.println("cpwg = " + cpwg);
            System.out.println("new password 1 text field <enter>");
            cpwg.jpfN2Password.requestFocus();
        }
        else if (cpwg !=null && source ==cpwg.jpfN2Password)
        {
            System.out.println("cpwg = " + cpwg);
            System.out.println("new password 2 text field <enter>");
            tryNewPassword();
        }
        else if (source == nbg.jbSubmit && (nbg.bookname.equals("") || nbg.authorf.equals("") || nbg.authors.equals("") || nbg.series.equals("")))
        {
            JOptionPane.showMessageDialog(null,  " Error, Fields have been left Empty! "," ERROR! ", JOptionPane.ERROR_MESSAGE); 
        }



        else if (nbg !=null && source ==nbg.jbSubmit)
        {
            System.out.println("Submit Button Clicked.");
            String bookName = NewBookGUI.jtfBookName.getText();
            String authorFName = NewBookGUI.jtfAuthorFName.getText();
            String authorSName = NewBookGUI.jtfAuthorSName.getText();
            int SeriesNo = Integer.parseInt(NewBookGUI.jtfSeriesNumber.getText());
            String SeriesNa = NewBookGUI.jtfSeriesName.getText();
            Store storage = new Store();
            Store.newBook (bookName, authorFName, authorSName, SeriesNo, SeriesNa);
            storage.closeConnection();
            nbg.dispose();
            System.out.println("View All Books");
            String sql="Select * from tblBook";
            getData(sql,"All Books");
            System.out.println(sql);
        }
        else if (source == nbg.jbCancel)
        {
            nbg.dispose();
        }

    }



    public void getData(String sql, String message) //uses queryfetcher
    {
        int noOfColumns = 0;
        QueryFetcher allBooks = new QueryFetcher("Library.mdb");
        String allValues[] [], colNames[], colTypes[];
        allValues = allBooks.getFilteredBooks(sql); 
        System.out.println("datavalues = " + allValues);
        colNames = allBooks.getLibraryColumnNames(sql);
        colTypes  = allBooks.getLibraryColumnTypes(sql);
        System.out.println("colNames = " + colNames + "colTypes = " + colTypes);
        showBooks(allValues, colNames, colTypes, message);

        }


    public void showBooks(String data[] [] , String cols[], String types[], String title) 
    {
        //takes arrays with data, column headings and data types and displays in JTable
        int c=cols.length;      //c = no of fields = length of colls array
        System.out.println("c = " + c);
        int r = data.length;    //r = no of rows
        System.out.println("r = " + r);
        int[] w = new int[c];   //width of each column
        System.out.println("w = " + w);
        int tw = 0;//total width of cols
        System.out.println("tw = " + tw);
        for  (int col=0;col<c;col++)    //loop through cols
                {
            w[col] = 5;
            for (int row=0;row<r;row++)
                    {   
                //add in £ symbol to currency values
                if (types[col].equals("CURRENCY")&& data[row][col]!=null )
                {
                    double d = Double.parseDouble(data[row][col]);     
                    if (d >=0)data[row][col] = "  £" + df.format(d);
                    else data[row][col] = "- £" + df.format(-d); 
                        }//end if
                //find maximum number of characters in each column of data
                if (data[row][col]!=null && w[col]<data[row][col].length()) w[col] = data[row][col].length();
                    }//end inner row for loop
            System.out.println("w["+col+"] = " + w[col]);
                    tw = tw + w[col];       //add size of each column to get total width
                }//end outer column for loop

            if (libg.scrollPane != null)libg.jpAll.remove(libg.scrollPane);     //remove scroll pane if exists
            libg.lTable = new JTable( data, cols );//create new JTable
            Color colour = new Color(91,209,234);
            libg.lTable.setBackground(colour);
            libg.scrollPane = new JScrollPane( libg.lTable );                 //... scrollpane
            libg.lTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);        
            libg.lsm = libg.lTable.getSelectionModel();                       //... list selection model
            libg.jpAll.add( libg.scrollPane, BorderLayout.CENTER);
            libg.jpAll.setBackground(Color.BLACK); 
            //set preferred column widths of JTable to match data widths in array w (with minimum of about 10 'pixels')
            for(int i=0;i<c;i++)
            {
                libg.lTable.getColumnModel().getColumn(i).setPreferredWidth(w[i]*10+15);
            }
            if (tw*10+c*15 < 1250)libg.setPreferredSize(new Dimension(tw*10+c*15,320));
            else libg.setPreferredSize(new Dimension(1250,320)); 
            libg.pack();
        }




        private void tryNewPassword()
        {
            String fpw = Store.charArrayToString(cpwg.jpfN1Password.getPassword());
            String spw = Store.charArrayToString(cpwg.jpfN2Password.getPassword());
            String opw = Store.charArrayToString(cpwg.jpfOPassword.getPassword());
            System.out.println("fpw = " + fpw + "and spw = " + spw + " and opw = " + opw);
            if(verifyPassword(fpw,spw)) //check new passwords match
            {
                System.out.println("new password verified");
                Store st = new Store();                      // create connection object
                int level = st.SQLfindLogin(user, opw);     //-1 login failed otherwise returns security level
                System.out.println("verified password level = " + level);
                if (level >0)       //old password is valid
                {
                    System.out.println("old password correct - changing password ...");
                    st.changePassword(user, fpw);
                    cpwg.jtfFeedback.setText("password changed");
                    JOptionPane.showMessageDialog(cpwg,"Change successful. Close window.","Password change",JOptionPane.INFORMATION_MESSAGE);
                    cpwg.dispose();
                }
                else System.out.println("password error - no change made");
                st.closeConnection();                  // close connection
            }
            else 
            {
                System.out.println("password needs to match and be valid - change FAILED");   
                cpwg.jtfFeedback.setText("change FAILED - try again");
            }
        }   

        private boolean verifyPassword(String p1, String p2)
        {
            if (p1.length() > 2 && p1.equals(p2)) return true;
            else return false;
        }

        //inner class to open login window as this window closes
        class WindowQuitter extends WindowAdapter
        {
            public void windowClosing( WindowEvent we )
            {

                System.out.println("Logged out...");
                //create login screen
                openLogin();
                libg.dispose();           //and quit   
            }
        }//end WindowQuitter class

    }//end of class

thats my main class.

G-to-the-RIZZLE 0 Newbie Poster · Answer 2 · 2009-03-24T04:45:48+00:00

Its all done in Bluej / java
the whole thing compiles together..... and login appears and when i log in it says its fine but just comes up with all this error message :(

VernonDozier 2,218 Posting Expert Featured Poster · Answer 3 · 2009-03-24T05:24:08+00:00

import java.sql.*;
import javax.swing.*;

public class TestClass
{
    public static void main (String args[])
    {
        System.out.println ("Hello World.");
    }
}

Does this program compile/run for you?

Ezzaral 2,714 Posting Sage Team Colleague Featured Poster · Answer 4 · 2009-03-24T08:41:24+00:00

>thats my main class.
I think you mean that's the main class you copied from someone else and can't get to run.

masijade 1,351 Industrious Poster Team Colleague Featured Poster · Answer 5 · 2009-03-24T13:00:22+00:00

masijade 1,351 Industrious Poster

17 Years Ago

Ach, nevermind. BlueJ, your whole problem starts there, IMHO.

G-to-the-RIZZLE 0 Newbie Poster · Answer 6 · 2009-03-24T15:26:08+00:00

i tried the testClass which you suggested and it works and compiles but i didnt copy the code frrom else where as its been working previously up to my last ammendment.

HELP - - - Longest ERROR MESSAGE

Dani AI

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