Cannot add actionListener to Button ?!?

Hi, I made a few minor modifications to a erstwhile working applet and get the following error message :
...
cannot resolve symbol
symbol : variable search
location : class java.awt.Panel
PanelCliInfo.search.ActionListener(this);
...
The complete applet is big, so here is the gist of it :

import java.applet.*;
import java.awt.*;
[B]import java.awt.event.*;[/B]
import java.awt.image.MemoryImageSource;
import javax.swing.ImageIcon;
import java.net.*;
import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
public class demoApplet
  extends Applet
  implements ActionListener
{
  private ClientInfo PanelCliInfo;
  private ClientPic  PanelCliPic;
  //
  public void init()
  {
    setLayout(new GridLayout(2,0)); // 2 rows and any number of columns...
    // Panel outerPanel = new Panel();
    // outerPanel.setLayout(new GridLayout(0,2)); // put 2 columns in first row
    Panel PanelCliInfo = new ClientInfo();
    add(PanelCliInfo, BorderLayout.NORTH);
    [B]PanelCliInfo.search.addActionListener(this); // this DOES NOT WORK! [/B]
    ... etc ...
  }// end of init();
  //
  public class ClientInfo extends Panel
  {
    TextField EmpNo = new TextField(15);
    ...etc ...
    [B]Button search = new Button("Search");[/B]
    //
    public ClientInfo()
    {
      setFont(new Font("SansSerif", Font.PLAIN, 10));//try Helvetica,Serif & SansSerif
      setLayout(new GridLayout(1,0));
      Panel panelLabel = new Panel();
      panelLabel.setLayout(new BorderLayout());
      //
      // panel inside a panel, set the inner panel to a gridbag layout...
      Panel p2 = new Panel();
        GridBagLayout gridbag = new GridBagLayout();
        p2.setLayout(gridbag);
        GridBagConstraints gbcon = new GridBagConstraints();
          gbcon.gridwidth = 2;
          gbcon.insets= new Insets(0,0,0,0);
          gbcon.weightx = 1.0;
          gbcon.weighty = 0.0;
          gbcon.anchor = gbcon.WEST;
          gbcon.fill = gbcon.NONE;
          gbcon.gridwidth = gbcon.REMAINDER; // last one in each row...
      add(p2, BorderLayout.WEST);
      // add the components
      ...etc...
      p2.add(new Label("Press to search", Label.RIGHT));
      gridbag.setConstraints(search, gbcon);
      [B]p2.add(search);[/B]
      // 
      return;
    } //end of ClientInfo()-method
  } // end of CliInfo Class
  /**
  *  Process an action
  *    search find the record with the Client ID
  */
  public void actionPerformed(ActionEvent event)
  {  
    Object obj = event.getSource();
    // Figure out which component caused the event
    if (obj == PanelCliInfo.search)
    {
      // If no demo object was created, then exit
      // Otherwise clear display fields, then get data
      repaint();
      //
      ...etc...
  }//end of actionPerformed()-method
  ...etc
}//end of demoApplet-applet

this is an innerclass problom ..
change
PanelCliInfo.search.addActionListener(this); // this DOES NOT WORK!
to
demoApplet.this.PanelCliInfo.search.addActionListener(this);
this will work
basha

Hi. Thanks for that, it compiles fine again.

However, when I try to run it after modifying and recompiling, I get this unusual runtime error on the java console :

When I re-instate the original applet without the inner panel p2, it works fine again and does not throw the NullPointer Exception !
The error message is too cryptic for me to begin debugging it. Nice Chrissy treat from JAVA.
Can you please explain the theory behind the "inner class" to me ? It would be nice to understand wy it compiles.

THX
Merry Christmas .

[ December 25, 2002: Message edited by: achana chan ]

u made a varible for ClientInfo twice and assigned object to local variable.that's the problm..
u can resolve like this,
change
Panel PanelCliInfo = new ClientInfo();//in init() method
to
PanelCliInfo = new ClientInfo();
that's all
basha