Why am I getting this exception???

Every once in a while I get the following exception when starting my app, and I can't figure out why... Why??
java.lang.NullPointerException
     at javax.swing.SwingUtilities.computeIntersection(SwingUtilities.java:369)
     at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:404)
     at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:117)
     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)

This is actually a very hard question. Swing is designed to be fast so it is not thread safe. That means if you do something to a swing component while its being painted, you get this type of exception. Notice how it does not mention your own code anywhere in the stack trace. The "Event Dispatcher Thread' is trying to paint something and you are probably changing its size, setting its visibility to false, removing it form its container, moving it, changing the data in its model, etc. Your code is doing something to the component at the exact moment its being painted, and this exception is thrown.
There are two general strategies for dealing with this problem:
1) When you modify swing components, use SwingUtilities.invokeLater() to make the event dispatcher thread do the work.
2) Do your work in a synchronized block, something that looks like this (say you are removing rows from a table):
synchronized ( table.getTreeLock() ) {
// do work here...
}Either of these strategies will prevent this type of error from happening. It's a tought problem, since it can happen anywhere, is usually hard to reproduce, and difficult to verify it's actually fixed.

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Why i always get this exception

i have one table and i use custom renderer to format the number value inside the table to 2 decimal points and when user click on a particular cell it will pop up a dialog also with a table and display detail value correspond to the value that user click, but the problem is i always get this exception anyone knows why?
java.lang.ArrayIndexOutOfBoundsException: 3 >= 3
     at java.util.Vector.elementAt(Vector.java:431)
     at javax.swing.table.DefaultTableModel.getValueAt(DefaultTableModel.java:618)
     at net.devicesworld.common.ui.SortableTableModel.getValueAt(SortableTableModel.java:56)
     at javax.swing.JTable.getValueAt(JTable.java:1771)
     at javax.swing.JTable.prepareRenderer(JTable.java:3724)
     at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:1149)
     at javax.swing.plaf.basic.BasicTableUI.paintCells(BasicTableUI.java:1051)
     at javax.swing.plaf.basic.BasicTableUI.paint(BasicTableUI.java:974)
     at javax.swing.plaf.ComponentUI.update(ComponentUI.java:142)
     at javax.swing.JComponent.paintComponent(JComponent.java:541)
     at javax.swing.JComponent.paint(JComponent.java:808)
     at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4795)
     at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4748)
     at javax.swing.JComponent._paintImmediately(JComponent.java:4692)
     at javax.swing.JComponent.paintImmediately(JComponent.java:4495)
     at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:410)
     at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:117)
     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)

actually i already check for the row and column index this is what i do for the getvalueat method inside the table model
public Object getValueAt(int row, int col) {
int rowIndex = row;
if (indexes != null && row < indexes.length && row >=0) {
rowIndex = indexes[row];
if(rowIndex < 0){
return null;//super.getValueAt(0, col);
}else if(rowIndex >= super.getRowCount()){
return super.getValueAt(getRowCount() - 1, col);
}else if(col >= super.getColumnCount()){
return super.getValueAt(rowIndex, super.getColumnCount()-1);
}else
return super.getValueAt(rowIndex >= getRowCount() ? getRowCount() - 1 :
rowIndex,
col >= getColumnCount() ? getColumnCount() - 1 :
col);
}

Why do i get this exception?

Hi,
i have a CompanyVO class, wich also has members such AddressVO, UserVO. As you can see, i have some other value objects inside CompanyVO.
When i do this:
CompanyVO companyVO = new CompanyVO();
BeanUtils.copyProperties(companyVO, customCompanyVO);CustomCompanyVO is an object that has only "direct" properties of CompanyVO, stuff like companyName, companyID, companyType (basically all of them are String).
But when i do this.
CompanyVO companyVO = new CompanyVO();
BeanUtils.copyProperties(companyVO, customCompanyVO);
BeanUtils.copyProperties(companyVO.getAddressVO(), addressVO);I get the following excetion just on the third line (note the addressVO contain the values to be transfered to AddressVO, wich a VO inside the CompanyVO, as i said).
java.lang.IllegalArgumentException: No destination bean specified
at org.apache.commons.beanutils.BeanUtils.copyProperties(BeanUtils.java:220)
at ltcmelo.session.RegisterCompanyBean.saveCompanyAddressInfo(RegisterCompanyBean.java:157)
So, if i already initialize the companyVO doesn't the addressVO and the userVO memers have to be initialized too ???
This way i'm force to do such thing.
CompanyVO companyVO = new CompanyVO();
BeanUtils.copyProperties(companyVO, customCompanyVO);
AddressVO auxAddressVO = new AddressVO();
BeanUtils.copyProperties(auxAddressVO, addressVO);
companyVO.setAddressVO(auxAddressVO);Is there a better option????

No, no, no....
There's a misunderstanting here! Sorry, it's my fault!
addressVO is already initialized and populated with data.
BUT, the addressVO that is a member of companyVO is NOT !!!
Using BeanUtils, i'm trying to populate what's FROM addressVO (wich contains data) TO companyVO.getAddressVO (wich has not been initializes).
So, i thought the i could initialize companyVO.getAddressVO in the way, but as i get the exception, it seems that it's not possible.
My question is WHY is it not possible??? It seems ok to me to copy addressVO to companyVO.getAddressVO in that way.

Why I keep getting this exception?

I try to introduce JSTL into my current work. I keep getting the following error
The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this applicationAfter searching this issue on the internet, I place the standard jstl 1.1.2 in our library direction under the WEB-INF. It doesn't go away however. The container is WebSphara Community Edition with jdb 1.5.
What is missing here?

What version of Websphere?
What servlet spec does it support? You can find out with this JSP snippet:
Working with server: <%= application.getServerInfo() %><br>
Servlet Specification: <%= application.getMajorVersion() %>.<%= application.getMinorVersion() %> <br>
JSP version: <%= JspFactory.getDefaultFactory().getEngineInfo().getSpecificationVersion() %><br>
Java Version: <%= System.getProperty("java.version") %><br>You have the files
- jstl.jar
- standard.jar
both in the WEB-INF/lib directory?
Restarted the server?
Are you sure it is JSTL1.1.2?
Open the file standard.jar in something like winzip.
Take a look at the manifest.mf file to check version.
Does standard.jar contain all the necessary tld files? c.tld - c-1_0.tld, c1_0-rt.tld

Why do I get this error when specifying a parameter from the URL?

Hello,
I am trying to "install" a parameter in a page, so that it's value can be specified in the URL and a VO updated according to this value.
Here's is the page definition file, with an executable and a binding to a method call:
<executables>
<invokeAction Binds="prepareMainMenuView1" id="invokeQuery"
Refresh="prepareModel"/>
</executables>
<methodAction id="prepareMainMenuView1"
InstanceName="AppModuleDataControl.dataProvider"
DataControl="AppModuleDataControl" RequiresUpdateModel="true"
Action="invokeMethod" MethodName="prepareMainMenuView1"
IsViewObjectMethod="true">
<NamedData NDName="param" NDValue="#{param.root_menu}"
NDType="java.lang.String"/>
</methodAction>
if I run the MyMenu application with:
http://127.0.0.1:7101/MyMenu-ViewController-context-root/faces/menu?root_menu=anything
then I get this exception:
ADF: Adding the following JSF error message: String index out of range: -1
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
Do you know why? Where do I fail?
I followed the isntruction here:
http://www.jasonsdevelopercorner.com/?p=65
So far I have not been able to read a parameter in a way, do you have any example on how can I use parameters from URL from within a single page in an unbounded task flow?
I worked all the day on this, but with no luck.
Thanks

I solved the problem. The invoked method was not part of the VO, but was part of the AM.

Why do i get this error?

Hi
When i run my code i get this exception,
java.lang.ClassCastException: java.lang.Integer
at has33.main(has33.java:29)
Why is it that i get this exception?
And could some help me so that i doun't get this Exception?
thanks
nicky
import java.io.*;
import java.lang.*;
import java.util.*;
public class has33{
public static void main(String[] args) {
Hashtable ht = new Hashtable();
//Add vector to store results
Vector results = new Vector();
Object value = null;
int keys[] = {1,2,3,4,5,6,7,8,9,10};
//System.out.println(keys);
String values[] = {"ben", "ben", "alex", "alex", "matt","matt", "mum", "mum", "dad", "matt"};
// First, map keys to values in a hashtable
Hashtable hash = new Hashtable();
// the code matches values one by one for each of the keys
for(int i = 0; i < keys.length; i++) {
hash.put(new Integer(keys), values[i]);
// Then we find each value and remove it from the hashtable
for(int j = 0; j < values.length; j++) {
ht = (hash);
value = (values[j]);
Vector v = new Vector();
String token = null;
StringTokenizer st = null;
if( ht.containsValue( value )) {
Enumeration e = ht.keys();
while (e.hasMoreElements()) {
String tempkey = (String)e.nextElement();
String tempvalue = (String)ht.get(tempkey);
if (tempvalue.equals(value)) {
v.add(tempkey);
ht.remove(tempkey);

No i mean to put then strings and Integers in hashtable like this
                         hash.put(new Integer(1), ben);
                         hash.put(new Integer(2), ben);
                         hash.put(new Integer(3), alex);
                         hash.put(new Integer(4), alex);
                         hash.put(new Integer(5), matt);
                         hash.put(new Integer(6), matt);
                         hash.put(new Integer(7), ben);
                         hash.put(new Integer(8), matt);
                         hash.put(new Integer(9), dad);
                                        hash.put(new Integer(10), dad);thanks
nicky

Why am I getting this error?

Hello,
I am trying to call my Java class from a JSP page. I am getting this error:
Generated servlet error:
C:\Program Files\Apache Tomcat 4.0\work\Standalone\localhost\em\jsp\Test_0005fSummarySBU_0005fscreen$jsp.java:82: Wrong number of arguments in constructor.
strQuery=new ListReturn(strEssUser, strProcessingMonth, strProcessingYear);
I don't understand why I am getting this error as I pass three paramters to the Java class, and I accept three parameters in the constructor.
JSP:

<META Http-Equiv="Expires" Content="0">
<META Http-Equiv="Pragma" Content="no-cache">
<HTML>

<%@ page import="com.home.tool.reporting.*" %>
<%@ page errorPage="run_error.jsp" %>
<%@ page import="java.util.List,
                 java.util.Collection,
            java.net.URLDecoder" %>
<HEAD>
<META NAME="GENERATOR" Content="Microsoft Visual Studio 6.0">
<TITLE>Economic Model - Summary SBU Report</TITLE>

<BODY bgcolor=#ffffff>
<%
                Collection strQuery = null;
                String strEssUser = "test";
                String strProcessingMonth = "JUL";
                String strProcessingYear = "2002";
                strQuery=new ListReturn(strEssUser, strProcessingMonth, strProcessingYear);
                System.out.println(strQuery);
%>
</BODY>
</HTML>Java class:
package com.home.tool.reporting;
import java.net.URL;
import java.sql.*;
import java.io.*;
import java.util.*;
public class ListReturn extends ReportQueryBuilder
        public void ListReturn()
        public Collection ListReturn(String userID, String pMonth, String pYear)
            throws ReportQueryBuilderException
            //declare Collection store Value-Object pairs
            Collection c = new ArrayList();
            //declare and initialize variables
            CallableStatement cs = null;
            ResultSet rs = null;
            // declare call for stored procedure to pass in three parameters
            String pass = "{Call dbo.p_rep_srSbuList(?, ?, ?)}";
            try
                //open CallableStatement using JDBC connection to SQL database
                cs = con.prepareCall(pass);
                //set IN parameters
                cs.setString(1, userID);
                cs.setString(2, pMonth);
                cs.setString(3, pYear);
                //execute call and return result set
                rs = cs.executeQuery();
                //loop through result set storing each record as a Value-Object pair
                while(rs.next())
                    c.add(new ListBoxValueObjects(rs.getString(1), rs.getString(2)));
            catch (SQLException sqle)
          throw new ReportQueryBuilderException(replaceToken("Problems executing query: "+sqle.getMessage(), "'", "\\'"));
            finally
                try
                    //close the Result Set and CallableStatement
                    rs.close();
                    cs.close();
                catch(Exception e)
                    System.out.print("\nFATAL   : " + e);
                    System.out.print("\nFATAL   : " + e);
            return c;
}Does anyone see whay I am getting this error??
I can't figure out the problem!

change this:
<%
     Collection strQuery = null;
     String strEssUser = "test";
     String strProcessingMonth = "JUL";
     String strProcessingYear = "2002";
     strQuery=new ListReturn(strEssUser, strProcessingMonth, strProcessingYear);
     System.out.println(strQuery);
%>To this:
<%
     Collection strQuery=null;
     String strEssUser="test";
     String strProcessingMonth="JUL";
     String strProcessingYear="2002";
     lr=new ListReturn(strEssUser, strProcessingMonth, strProcessingYear);
     System.out.println(lr.getQuery())
%>Then make a new public method in your Java called getQuery()
public Collection getQuery();Do what you need to do to process it and return the value in getQuery. You will also probably need to make private variables in you declaration to do the processing on.

TS1702 "The feature you are trying to use is on a network resource that is unabailable" Why am I getting this message when I try to updaate itunes or quicktime?

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After iTunes & Quicktime are uninstalled, try the update again.

I get missing plug-in error when opening my online bill which is in PDF format. I am using a 2010 Macbook with the latest version of Safari and Adobe suite installed in my computer. Why do I get this error? What should I do?

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In relation to my previous inquiry regarding inability to view a pdf file using Safari...
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I received an error "iTunes requires 64-bit mode" says to go into my iTunes application and 'uncheck' the 'open in 32-bit mode' checkbox - i went into the application and the box was not checked anyway so why am i getting this prompt? Never happened b4

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Thanks to dpepper...
https://discussions.apple.com/thread/3867171?tstart=0

Why am I getting this exception???

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