NullPointerException Error

[Lost Prophet]

Hi

Im having a problem with some code. Originally, the application was set into three packages (script, gui and control). I have changed is so there is a fourth called 'report'. Whenever I call upon anything in the report package though, there is a NullPointerExce ption for the 'report' variable (which identifies the location of the report. The below part is where the problem occurs:

private void injuriesMouseCl icked(java.awt. event.MouseEven t evt)
{
Injuries = true;

report.reportIn fo();
}

In the above part both the report and Injuries variables are populated with the correct information

In some circumstances (this is the wierd thing), the reportInfo class is accessed, but when I try to retrieve the value of 'report' to check the value, the execution refuses to print out anything in the report.reportIn fo class. But when I print out a random bit of text it prints it out fine. Whenever I try both it does nothing!! The code in report.reportIn fo is below:

public class ReportData implements ScriptThread, Runnable
{
private DCWorkbenchGUI gui;
private VppController control;
private ComplexScript script;

//state variables for the script
public int publicDisorder = 0;
public int soldierInjuries = 0;
public int publicInjuries = 0;
public int civilanFireInju ries = 0;
public int civilanFireFata lities = 0;
public int soldierFataliti es = 0;
public int suspectApprehen sion = 0;
public int baseDamage = 0;
public int pressCoverage = 0;

/**
* Constructor for the ReportData thread
*
* @param g the gui
* @param c the controller
* @param s the script
*/
public ReportData(DCWo rkbenchGUI g, VppController c, ComplexScript s)
{
gui = g;
control = c;
script = s;
}

/**
* This method is that which will be invoked when the method is called upon
*/
public void run()
{
reportInfo();
}

/**
* Method to represent the action for the report information
*/
public void reportInfo()
{
System.out.prin tln("reportInfo : ");
if (gui.Injuries = true)
{
String Injuries = ("Soldier Injuries (max 27): " + soldierInjuries +"\n" +
"Public Injuries (max 20): " + publicInjuries +"\n" +
"Civilian Emergency Services Injuries (max 10): " + civilanFireInju ries);

//display info dialog to the user
gui.scenInfo("T he following information has been found by your assistant \n"+ Injuries,
"General Information",
script.currentT imeInSecs());
gui.Injuries = false;
}


EndReport();

}
}

*************** *************** *************

The errors are below:

Exception in thread "AWT-EventQueue-0" java.lang.NullP ointerException
at dcw.report.Repo rtData.reportIn fo(ReportData.j ava:5 9)
at dcw.gui.DCWorkb enchGUI.injurie sMouseClicked(D CWork benchGUI.java:2 34)
at dcw.gui.DCWorkb enchGUI.access$ 000(DCWorkbench GUI.j ava:34)
at dcw.gui.DCWorkb enchGUI$1.mouse Clicked(DCWorkb enchG UI.java:161)
at java.awt.AWTEve ntMulticaster.m ouseClicked(AWT Event Multicaster.jav a:253)
at java.awt.Compon ent.processMous eEvent(Componen t.jav a:6044)
at javax.swing.JCo mponent.process MouseEvent(JCom ponen t.java:3265)
at java.awt.Compon ent.processEven t(Component.jav a:580 6)
at java.awt.Contai ner.processEven t(Container.jav a:205 8)
at java.awt.Compon ent.dispatchEve ntImpl(Componen t.jav a:4413)
at java.awt.Contai ner.dispatchEve ntImpl(Containe r.jav a:2116)
at java.awt.Compon ent.dispatchEve nt(Component.ja va:42 43)
at java.awt.Lightw eightDispatcher .retargetMouseE vent( Container.java: 4322)
at java.awt.Lightw eightDispatcher .processMouseEv ent(C ontainer.java:3 995)
at java.awt.Lightw eightDispatcher .dispatchEvent( Conta iner.java:3916)
at java.awt.Contai ner.dispatchEve ntImpl(Containe r.jav a:2102)
at java.awt.Window .dispatchEventI mpl(Window.java :2440 )
at java.awt.Compon ent.dispatchEve nt(Component.ja va:42 43)
at java.awt.EventQ ueue.dispatchEv ent(EventQueue. java: 599)
at java.awt.EventD ispatchThread.p umpOneEventForF ilter s(EventDispatch Thread.java:273 )
at java.awt.EventD ispatchThread.p umpEventsForFil ter(E ventDispatchThr ead.java:183)
at java.awt.EventD ispatchThread.p umpEventsForHie rarch y(EventDispatch Thread.java:173 )
at java.awt.EventD ispatchThread.p umpEvents(Event Dispa tchThread.java: 168)
at java.awt.EventD ispatchThread.p umpEvents(Event Dispa tchThread.java: 160)
at java.awt.EventD ispatchThread.r un(EventDispatc hThre ad.java:121)

[JosAH]

[QUOTE=Lost Prophet]

You have to carefully read the stack trace insead of throwing your hands up in the
air. NullPointer exceptions are sitting ducks (ref: r035198x) when you surround
them with the relevant debug System.out.prin tln() statements. This is the quilty
one:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at dcw.report.ReportData.reportInfo(ReportData.java:59)

At line 59 in your reportInfo() method something is null which it shouldn't be.
It's debugging time.

kind regards,

Jos