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

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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 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.

Can any one explain why I keep getting this message?

Hello I keep getting the following poping up in a box headed Adobe Flash Player 10.2.153.1:
Security Error: Error#2000: No Security context.
It gives me two options. 1. to Dismiss All and the 2nd to continue.
Can anyone please explain why it maybe crashing my browser.
Thanks.
Matt

It calls it an ActionScript Error.

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