NullPointer Exception Error

I only want to do a simple "Hello world!" prog but i always get an "NullPointerException" error. So what's wrong?
Here's the code:
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class HelloMIDlet extends MIDlet
     private Display display;
     TextBox text = null;
     public HelloMIDlet()
          display = Display.getDisplay(this);
          text = new TextBox("hello","hello",20,0);
     public void startApp()
          display.setCurrent(text);
     public void pauseApp()
     public void destroyApp(boolean d)
Thanks for your help!
Chris

Unable to create MIDlet null
java.lang.NullPointerExceptionFirstly, is this trying to create your MIDlet? Or is 'null' the name of the MIDlet that it's trying to instantiate. I.e. is this just a configuration error?
Secondly, if not a config error, is the method Display.getDisplay throwing the null pointer exception?

Similar Messages

Java.lang.NullPointer Exception error in webi

Hi All,
When a opening a webi report a user is getting java.lang.NullPointer Exception error in webi for a single report.
Other reports which were build from same universe are working fine. The issue is only with one user and one report.
Environment:
Business Objects XIR3
Java 6 ,update 3
IE version 7
Web Application Server - Apache Tomcat
Thanks in Advance....

Hi,
Check whether the same user is able to open the report in some other machine?
What happens when the user is trying to open other reports? Does he gets the error again?
If the reports is working with other machine, check the java version of the machines.
If the report is working with other users, it not possible that the universe is damaged.
This issue cannot be a rights issue. It has to be something with the report, java, or the universe.
Please check the above details and let me know.
Regards,
Shreyash.

Nullpointer exception... any help would be appreciated

In advance, I apologize for any ignorance which I may obviously have... I'm in the process of learning Java, and am used to C/C++... In any case, I'm running into a nullpointer exception while 'compiling', which I'm having trouble figuring out... I'll list everything below, but this message will be rather long, as I will try to include everything I can. For this reason, I will ask my questions here, at the top:
1) A null pointer exception, I believe, is generated when something is being referenced which is currently null, for example "a=null; a.b;" yields a null pointer exception. However, is there any other way that one is generated?
2) Are there methods to figure out what/why something is null other than simply looking at it? As shown below, it seems that just looking at it runs you in a circle from line to line, file to file, which leads you back to the beginning where nothing is actually null... (I'm probably just not seeing it, but that seems to be what's happening to me)
So now, on to the actual code:
The following is a printout of the debugging info:
~/bin/jdk*/bin/java -classpath classes jamie.Main
java.lang.NullPointerException
at jamie.Main.Sys_Log(Main.java:110)
at jamie.Main.Setup(Main.java:142)
at jamie.Main.main(Main.java:54)
Exception in thread "main" java.lang.NullPointerException
at jamie.Main.Sys_Log(Main.java:110)
at jamie.Main.Shutdown(Main.java:182)
at jamie.Main.main(Main.java:92)And a short excerpt of each. (*) indicates line which error originates:
20    )   private static Log                sys_log;
108 )   static void Sys_Log(String msg)
109 )   {
110*)        sys_log.Log(msg);
111 )   }
142*)   Sys_Log("Server warming up...");
182*)   Sys_Log("Server shutting down...");
50 )     public static void main(String[] args)
51 )     {
52 )          try
53 )          {
54*)                Setup();
85 )     catch(Exception e)
86 )     {
87 )          e.printStackTrace(System.out);
88 )          err_log.Log(e.toString());
89 )     }
90 )     finally
91 )     {
92*)            Shutdown();
93 )      }Now, various things that I have tried, and their result (you can probably skip this section, as these were mostly futile efforts):
What seems odd to me is that the initial error is on line 110, which is the logging function Sys_Log. Since it's a null pointer exception, I would assume that sys_log is null? and thus in calling Log we're generating that error... I'm not entirely sure that that makes sense, though. Additionally, and what I find odd, is that if I change it to what I will list below, I get a slew of other seemingly unrelated problems:
20    )   private static Log                sys_log;
108 )   static void Sys_Log(String msg)
109 )   {
110#)        if (sys_log!=null)
111 )        sys_log.Log(msg);
112 )   }This results in a problem with function Err_Log, which I change the same way, resulting in the following:
java.lang.NullPointerException
        at jamie.Area_LUL.Load(Area_LUL.java:23)
        at jamie.Main.Setup(Main.java:161)
        at jamie.Main.main(Main.java:55)
Exception in thread "main" java.lang.NullPointerException
        at jamie.Main.Shutdown(Main.java:186)
        at jamie.Main.main(Main.java:93)In Main.java the following lines are generating the error:
160 )   lul = new Area_LUL();
161*)   lul.Load();And in Area_LUL.java I also have the following:
14 )class Area_LUL implements LoaderUnloader
15 ){
16 )    public void Load()
17 )    {
18 )        try
19 )        {
20 )            areadir = new File("./areas/");
21 )            SAXParser p = SAXParserFactory.newInstance().newSAXParser();
22 )
23*)            for(File curr : areadir.listFiles(new Area_Filter()))
24 )            {
25 )                p.parse(curr, new XMLParser());
26 )            }
27 )        }Where in the above, the for statement is generating the null pointer exception... which would tell me that areadir is null, however it is defined as new File("./areas/"); Also, lul (defined as new Area_LUL(); is generating the same error, though it is clearly defined in Area_LUL.java at the top of the last excerpt.
Also, LoaderUnloader is defined in another file as follows:
interface LoaderUnloader
    void Load();
    void Unload();
}which are defined in Area_LUL in Area_LUL.java .
A major theory which I currently have is that the compiler is beginning with my main.java file, and not seeing the class definition in another file, and thus attributing the class obj I create as null, which is causing the error, but I also am not sure if this is possible...
My imports for Main.java are as follows:
package jamie;
import java.io.*;
import java.util.*;I'm not entirely sure what the package is including, however I do have a jamie.jar file in another directory (../../dist) (could be referencing that?). Also, to compile the source I am using the following command:
~/bin/jdk*/bin/java -classpath classes jamie.MainHowever my classpath (I believe) isn't set to include all my files in the given directory. I wouldn't believe that this would be an issue, however if it could possibly be causing this, I can figure out how to set it properly. Also, this should mean I'm starting with Main.java, and perhaps I am right in concluding that it isn't referencing Area_LUL in another file properly, which is setting it as null?
In any case... Any help would be greatly appreciated. This has been a bit of a struggle for about a month now, trying various resources, moving things around, etc... Thanks so much for your time in reading,
-Jess

I'm not able to follow the program flow from your post. Please create a small standalone program that exhibits the problem and post that back here.
Your assumption re a NPE is correct, that's the only way they're generated.
There are no "canned" methods to resolve NPEs. The best solution is to put System.out.println statements for all of the involved objects and variables immediately preceeding the error line (in this case, 110) and something will show null. Usually that's enough info to backtrace to the real cause.

Java.lang.NullPointer Exception in File-RFC-File wtihout BPM scenario

Hi All,
I have implemented scenario File - RFC - File without BPM in PI7.1 according to below link by bhavesh
[File - RFC - File without a BPM - Possible from SP 19.;
but I am getting error java.lang.NullPointer Exception in Audit log of sender communication channel when it enters in ResponseOnewayBean.
I had implemented the same in PI 7.0 but there it was working fine.
Is there any limitations on the use of the above beans in PI7.1 as I could see two more threads on the same unanswered yet.
Please help me in resolving as it is priority task for me
Thanks,
Amit

Sometime back I saved this SAP Note 1261159 for this error. Not sure if it is still valid. Try to get it implemented.
Regards,
Prateek

Help with nullPointer exception

Hi,
I would like some help identifying and error in the code below. Im getting a nullPointer exception at the location specified in the code. Im adding elements to a tableModel. What puzzles me is that the strings I add to the model does contain values. And it does not complain about adding them. Perhaps this is just a simple error, and you more experinced programmars are probably loughing at me ;)
void getTests() {
      String[] idNummer = getDirectory(); //gets filenames from a directory
      for (int i = 0; i < idNummer.length; i++) {
         idNummer[i] = idNummer.substring(idNummer[i].lastIndexOf(dataSeparetor) + 1, idNummer[i].length());
// just sorts out specific parts of the filenames
for (int i = 0; i < idNummer.length; i ++) {
System.out.println(idNummer[i]); //I print the sorted filenames and they not null
testModel.addElement(idNummer[i]); //I add them to the table model
testNr.setModel(testModel); //and gets a nullPoint exception here??

I'm sorry, you mean testNr. Don't pay any attention to the above post. it is also declared directly in the class:
public class GUI extends JFrame implements EventListener {
JList testModel;
}and creates an instance here:
public GUI {
testModel = new DefaultListModel();
getTests();
testNr = new JList(testModel);
      testNr.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
      testNr.setLayoutOrientation(JList.VERTICAL);
      testNr.setPreferredSize(new Dimension(80, 80));
      testNr.addListSelectionListener(new ListSelectionListener() {
         public void valueChanged(ListSelectionEvent event) {
      leftPanel.add(testNr, BorderLayout.EAST);
}

ArrayList nullpointer exception

I'm creating a game called bubblebreaker in Java, with the principle off model, view and controller classes.
In my model class I create a list of bubble objects. In the view I make these bubbles visible and in the controller class I react on external events (mouseclicks, ...)
My design is almost finished but I'm having some troubles removing my selected bubbles.
When I have selected my bubbles I want to remove them with another click on that bubble.
In the method deleteBub(Bubble delete) I will use the "set" method from the arraylist and make the bubble object "null":
protected void deleteBub(Bubble delete) {
        bubbleList.set(delete.getNumber(), null);
}This is the error:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
+     at Model.deleteBub(Model.java:69)+
It also points to this method:
In the view class I check if the object is null:
protected void drawBub(Bubble bubb, Graphics g) {
            if(bubb!=null) {
                g.setColor(bubb.getColor());
                g.fillOval(20*bubb.getX(), 20*bubb.getY(), 20*model.getRadius(), 20*model.getRadius());
            else System.out.println(bubb.getNumber() + " is null");
}There are no compilation errors. I just get a nullpointer exception when I click the second time on a bubble, so when it should be made null.
Edited by: Lektroluv on May 5, 2009 2:22 AM

I think I'm not on the same level as you.
The set command replaces the original bubble object with null, wright?
So for example the list changes from this:
new Bubble(.....)
new Bubble(.....)
new Bubble(.....)
new Bubble(.....)
...to this:
new Bubble(.....)
null
new Bubble(.....)
null
new Bubble(.....)
new Bubble(.....)
...The second list isn't good, because it has "nulls" in it?!?!? --> nullpointer exception?
What I've done next is in stead off replacing it with null, replacing it with new Bubble(BLACK ...)
new Bubble(.....)
new Bubble(BLACK ...)
new Bubble(.....)
new Bubble(BLACK ...)
new Bubble(.....)
new Bubble(.....)
...Edited by: Lektroluv on May 5, 2009 8:37 AM
Edited by: Lektroluv on May 5, 2009 8:37 AM

1 View linked to 2 CompCont: NullPointer Exception

Hi,
Here is the architecture of my app :
MainView --> CompContA --> ModelA (RFC function A)
........|
........|---> IntCompB --> CompContB --> Model B (RFC function B)
And here is the content of the MainView :
AdviceNumber : [
Z2_I_Rechercher_Avis_Input.AdviceNumber) | RefreshButton1
UserId : [Z2_I_Rechercher_Bottin_Input.UserId) | RefreshButton2
Name : [Z2_I_Rechercher_Avis_Input.Output.It_Infos_Bottin.Name)
Now, my application works when I populate an AdviceNumber and press the RefreshButton1. At the return, the name field is refreshed and I use some Java code to move the UserId that my function returned to the UserId of the screen. This works well.
Then if I change the value of the UserId in the screen and press the RefreshButton2, the second function returns me another name, and I use some Java code to move this name into the Name field of the screen. This works well too.
The problem is that I can't use the refreshButton2 first! I get a NullPointer exception.
And I know why, it's because the « Output » structure of my Z2_I_Rechercher_Avis_Input is not initialized (since the refreshButton1 has not been used yet).
But I can't find the right way to code it.
Can you help me, thanks!
Message was edited by:
        Emanuel Champagne

I want the user to click on the button he wants.
I just need to know how to initialize the Output.Struc1 when the user decides to click on the RefreshButton2 First.
It's the line in bold that give me the error (but that line works well when the RefreshButton1 is used first!)
public void onActionRafraichirAvis(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent )
    //@@begin onActionRafraichirAvis(ServerEvent)
     //$$begin ActionButton(-775562010)
     wdThis.wdGetAvisCompController().executeZ2_I_Rechercher_Avis_Input();
     //$$end
     // At the return, we need to refresh the values of the screen with the ones returned by the function.
     // Access to the structure showed on the screen
IIt_Infos_BottinElement AvisInfosBottinEl = wdContext
                                                              .nodeIt_Infos_Bottin()
                                                              .currentIt_Infos_BottinElement();
    // Access to the structure received by the RFC function
    IIt_Z2I053TElement BottinEl = wdContext
                                                         .nodeIt_Z2I053T()
                                                         .currentIt_Z2I053TElement();
     <b>AvisInfosBottinEl.setName(BottinEl.getName());</b>
Message was edited by:
        Emanuel Champagne

Java.Lang.NullPoint.Exception in OWB Mapping

Hello Everybody
We are building Data Warehouse using OWB Repository 9.2.0.2.0. When we are validating or deploying the created map we are getting Java.Lang.NullPoint.Exception. This leads to blank screen. We are unable to recover the map. Sometimes, synchronization works to recover the map, but not all the times.
Is there any solution to it?

Mark
Is it possible to solve the problem without migrating? I have the details of error as follows --
java.lang.NullPointerException
java.lang.NullPointerException
     at oracle.wh.service.impl.mapping.metadata.WBMappingGraphImpl.<init>(WBMappingGraphImpl.java:43)
     at oracle.wh.service.impl.mapping.metadata.WBMappingGraphHelper.createMappingGraph(WBMappingGraphHelper.java:31)
     at oracle.wh.ui.mapping.MappingGraphNew.drawStage(MappingGraphNew.java:2660)
     at oracle.wh.ui.mapping.MappingGraphNew.setStage(MappingGraphNew.java:484)
     at oracle.wh.ui.mapping.MappingEditorCanvas.refresh(MappingEditorCanvas.java:287)
     at oracle.wh.ui.common.WhFolderEditor.refreshCanvas(WhFolderEditor.java:951)
     at oracle.wh.ui.common.WhFolderEditor.refresh(WhFolderEditor.java:604)
     at oracle.wh.ui.common.WhFolderEditor$1$MyRefresh.run(WhFolderEditor.java:424)
     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:154)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:337)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:131)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:98)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)
I appreciate your feedback.
Cheers, Bana

Elusive Nullpointer Exceptions

I am debugging a program that replicates the behaviour of a coffee machine (its a homework exercise). I keep getting a nullpointer exception that I just can't figure out.
below is a transcript of the actions i have perfomed to replicated the error.
Welcome to the CoffeeMaker!
1. Add a recipe
2. Delete a recipe
3. Edit a recipe
4. Add inventory
5. Check inventory
6. Make coffee
0. Exit
Please press the number that corresponds to what you would like the coffee maker to do.
1
Please enter the recipe name:
coco
Please enter the recipe price: $
1
Please enter the units of coffee in the recipe:
1
Please enter the units of milk in the recipe:
1
Please enter the units of sugar in the recipe:
1
Please enter the units of chocolate in the recipe:
1
coco successfully added.
1. Add a recipe
2. Delete a recipe
3. Edit a recipe
4. Add inventory
5. Check inventory
6. Make coffee
0. Exit
Please press the number that corresponds to what you would like the coffee maker to do.
2
1. null
2. null
3. null
4. coco
Please select the number of the recipe to delete.
4
coco successfully deleted.
1. Add a recipe
2. Delete a recipe
3. Edit a recipe
4. Add inventory
5. Check inventory
6. Make coffee
0. Exit
Please press the number that corresponds to what you would like the coffee maker to do.
2
1. null
2. null
3. null
Exception in thread "main" java.lang.NullPointerException
     at edu.ncsu.csc326.coffeemaker.Main.deleteRecipe(Main.java:95)
     at edu.ncsu.csc326.coffeemaker.Main.mainMenu(Main.java:29)
     at edu.ncsu.csc326.coffeemaker.Main.deleteRecipe(Main.java:112)
     at edu.ncsu.csc326.coffeemaker.Main.mainMenu(Main.java:29)
     at edu.ncsu.csc326.coffeemaker.Main.addRecipe(Main.java:89)
     at edu.ncsu.csc326.coffeemaker.Main.mainMenu(Main.java:28)
     at edu.ncsu.csc326.coffeemaker.Main.main(Main.java:273)
    public static void deleteRecipe() {
        Recipe [] recipes = coffeeMaker.getRecipes();
        for(int i = 0; i < recipes.length; i++) {
        System.out.println((i+1) + ". " + recipes.getName());
String recipeToDeleteString = inputOutput("Please select the number of the recipe to delete.");
int recipeToDelete = stringToInt(recipeToDeleteString) - 1;
     if(recipeToDelete < 0) {
          mainMenu();
boolean recipeDeleted = coffeeMaker.deleteRecipe(recipes[recipeToDelete]);
if(recipeDeleted)
     System.out.println(recipes[recipeToDelete].getName() + " successfully deleted.");
     recipes[recipeToDelete] = null;     // this line deletes the recipe
     else System.out.println(recipes[recipeToDelete].getName() + "could not be deleted.");
mainMenu();
    public boolean deleteRecipe(Recipe r) {
        boolean canDeleteRecipe = false;
        if(r != null) {
             for(int i = 0; i < NUM_RECIPES; i++) {
                 if(r.equals(recipeArray)) {
//          recipeArray[i] = recipeArray[i];
     canDeleteRecipe = true;
return canDeleteRecipe;
    public boolean deleteRecipe(Recipe r) {
        boolean canDeleteRecipe = false;
        if(r != null) {
             for(int i = 0; i < NUM_RECIPES; i++) {
                 if(r.equals(recipeArray)) {
//          recipeArray[i] = recipeArray[i];
     canDeleteRecipe = true;
return canDeleteRecipe;
public String getName(){
     if(name !=null)
          return name;
     else
          return "null";
If I am trying to return a value from null, then why do the other elements in the array not throw a null pointer exception as well?

        System.out.println((i+1) + ". " + recipes.getName());

Why the nullpointer exception

I have a login screen where when i put information into the username and password field and then press login it calls the method below sendLogin(), but when I do so I get a nullpointer exception on the first patient.setUsername. I do get the println of what was entered into the txt fields. The txtFldUsername is a jtxtfield, and I have put information into it, yet it doesn't seem to be accepting it.
here is the error lines i have
username = hello
password = world
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at mmsi.loginScreen.sendLogin(loginScreen.java:217)
at mmsi.loginScreen.btnLoginActionPerformed(loginScreen.java:165)
at mmsi.loginScreen.access$000(loginScreen.java:16)
at mmsi.loginScreen$1.actionPerformed(loginScreen.java:67)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
also, when i put no information in, the program hangs, and i get no output.
public void sendLogin(){
        if (txtFldUsername.getText().trim().equals("") || pswrdFldPassword.getText().trim().equals("")){
            JOptionPane.showMessageDialog(null,"Complete empty field(s)","Warning",JOptionPane.WARNING_MESSAGE);
        } else {
           System.out.println("username = " + txtFldUsername.getText());
           System.out.println("password = " + pswrdFldPassword.getText());
            patient.setUsername(txtFldUsername.getText().trim());
            patient.setPassword(pswrdFldPassword.getText().trim());
            patient.setAction("login");
            trans.sendPatient(objOut, patient);
    }

patient.setUsername(txtFldUsername.getText().trim());
sorry didn't note it very well in my description

CLOB.createTemporary gives Nullpointer Exception

Hello,
I'm trying to create a temporary clob in my java code, but when I run the program I get the following exception.
java.lang.NullPointerException
     at oracle.sql.LobPlsqlUtil.plsql_createTemporaryLob(LobPlsqlUtil.java:1354)
     at oracle.jdbc.dbaccess.DBAccess.createTemporaryLob(DBAccess.java:997)
     at oracle.sql.LobDBAccessImpl.createTemporaryClob(LobDBAccessImpl.java:240)
     at oracle.sql.CLOB.createTemporary(CLOB.java:527)
     at org.tennet.utils.bc4j.ApplicationModuleImpl.createClob(ApplicationModuleImpl.java:278)
     at org.tennet.utils.bc4j.ApplicationModuleImpl.createClobDomain(ApplicationModuleImpl.java:299)
     at org.tennet.nevada.loader.ResultLoader.executeProcedure(ResultLoader.java:243)
     at org.tennet.nevada.loader.ResultLoader.process(ResultLoader.java:77)
     at org.tennet.nevada.broker.processor.RequestProcessor.processResult(RequestProcessor.java:374)
     at org.tennet.nevada.broker.processor.LoadFlowVAProcessor.process(LoadFlowVAProcessor.java:132)
     at org.tennet.nevada.broker.RequestHandler.processRequest(RequestHandler.java:289)
     at org.tennet.nevada.broker.RequestHandler.run(RequestHandler.java:137)
This error started when I began using Data Sources instate of direct JDBC Connections.
The problem is there is no source available for this class so I cant look what is causing the Nullpointer Exception.
Can someone tell me what is causing this problem?
Regards,
Dennis Labordus

Hi Dennis,
I have had the same problem as this. I am going to get onto Oracle via Metalink about it.
However - there is a work around.
We are using OC4J with its data sources.
There is a method on the OC4J Connection called getCoreConnection(Connection). This returns the underlying Oracle connection.
If you then pass this underlying oracle connection to CLOB.createTemporary() it works.
We had to use reflection to call the method as I couldn't seem to cast it statically.
Paul McHugh
* getOracleConnection
* Derive oracle connection from DataSource connection
private static OracleConnection getOracleConnection (Connection connection) throws SQLException
System.err.println ("UserTypeImpl.getOracleConnection: " + connection);
* Check for an existing oracle connection
* This should be the case in a database deployment
if (connection instanceof oracle.jdbc.driver.OracleConnection)
System.err.println (" Connection is already the base Oracle Connection" + connection);
return (OracleConnection) connection;
* Check for an OC4J deployment
else
System.err.println (" Searching for core connection ...");
Object conObj = (Object) connection;
Class conclass = conObj.getClass();
OracleConnection coreCon = null;
Method meth = null;
// Locate method getCoreConnection on Orion data source
try {
Class[] parameterTypes = new Class[] {java.sql.Connection.class};
meth = conclass.getMethod("getCoreConnection", parameterTypes);
} catch (NoSuchMethodException e)
e.printStackTrace();
throw new SQLException ("UserTypeImpl.getOracleConnection: No such method: getCoreConnection: " + e);
// Invoke method getCoreConnection on orion data source
try {
Object[] args = new Object[] {connection};
coreCon = (OracleConnection) meth.invoke(conObj, args);
catch (InvocationTargetException e)
e.printStackTrace();
throw new SQLException ("UserTypeImpl.getOracleConnection: Invoke: getCoreConnection: " + e);
catch (IllegalAccessException e)
e.printStackTrace();
throw new SQLException ("UserTypeImpl.getOracleConnection: Invoke: getCoreConnection: " + e);
if (coreCon != null)
System.err.println (" Core connection found: " + coreCon);
return coreCon;
} else
System.err.println (" Unable to locate core connection.");
throw new SQLException ("UserTypeImpl.getOracleConnection: Unable to locate core oracle connection.");

What does a NullPointer Exception mean?

Does anyone know what a NullPointer Exception mean? What is it trying to tell me?

Declaring String variables with an initial value of "" (a zero-length String), isn't really going to solve the problem, which is that a String variable is being used before it's (meaningfully) initialized. I mean, if the code is something like this:
String s = null;
// the coder thinks he's setting s to be a line of user input here,
// but he's really not
int length = s.length();Then replacing null with "" in the first line of code doesn't fix the problem, it just hides it.
Also I'd argue that in practice, it's a bad thing to do
try {
// stuff
} catch (Exception e) {
// more stuff
}That is, to catch every single exception, including unchecked ones.
1) It makes your code responsible for things it shouldn't be responsible for (NullPointerExceptions in any classes you used but didn't write, for example).
2) It's unlikely that a single catch block can handle error recovery for any possible exception.
3) It's not self-documenting. If you see "catch(NumberFormatException e)" in someone else's code, you can reasonably deduce that it's likely that some number parsing is going on. If you see "catch (Exception e)", all you know is that anything could be going on.
4) It can make debugging difficult. If class B catches all exceptions, then an exception caught by B thrown in class C, won't be visible to class A that calls the method in class B that eventually leads to an exception being thrown. Bugs can be partially hidden, eventually turning up in especially sneaky awful ways.
It can be useful to call all exceptions in throwaway test or debugging code, but I'd advice against using it in production code.

Handling a NullPointer exception....

I'm trying to create an application that compares to data files and prints the line that's different between the 2 files. I keep getting a NullPointer exception and am not sure how to solve this problem. Any ideas??
FILE 1
===================
User 1
User 2
User 3
User 4
User 5
FILE 2
===================
User 1
User 2
User 6
User 4
User 5
===================
import java.util.StringTokenizer;
import java.io.*;
public class DataComparison
public static void main (String[] args)
try
StringTokenizer tokenizer1, tokenizer2;
String lineFile1, lineFile2, name1, name2, file1="test1.txt", file2="test2.txt";
FileReader fr1 = new FileReader (file1);
BufferedReader inFile1 = new BufferedReader (fr1);
FileReader fr2 = new FileReader (file2);
BufferedReader inFile2 = new BufferedReader (fr2);
lineFile1 = inFile1.readLine();
lineFile2 = inFile2.readLine();
while (lineFile1 != null && lineFile2 != null)
tokenizer1 = new StringTokenizer (lineFile1);
name1 = tokenizer1.nextToken();
tokenizer2 = new StringTokenizer (lineFile2);
name2 = tokenizer2.nextToken();
while ((lineFile1.compareTo(lineFile2)<0) && (lineFile1 != null && lineFile2 != null))
if (!lineFile1.equals(lineFile2))
System.out.println (lineFile1 + " " + lineFile2);
lineFile1 = inFile1.readLine();
lineFile2 = inFile2.readLine();
while ((lineFile1.compareTo(lineFile2)==0) && (lineFile1 != null && lineFile2 != null))
if (!lineFile1.equals(lineFile2))
System.out.println (lineFile1 + " " + lineFile2);
lineFile1 = inFile1.readLine();
lineFile2 = inFile2.readLine();
while ((lineFile1.compareTo(lineFile2)>0) && (lineFile1 != null && lineFile2 != null))
if (!lineFile1.equals(lineFile2))
System.out.println (lineFile1 + " " + lineFile2);
lineFile1 = inFile1.readLine();
lineFile2 = inFile2.readLine();
lineFile1 = inFile1.readLine();
lineFile2 = inFile2.readLine();
inFile1.close();
inFile2.close();
catch (FileNotFoundException exception)
System.out.println ("The file was not found.");
catch (IOException exception)
System.out.println (exception);
catch (NullPointerException exception)
System.out.println (exception);

If you change your program slightly replacing
catch (NullPointerException exception)
System.out.println (exception);
}with
catch (NullPointerException exception)
exception.printStackTrace(System.out);
}it should print out a stack trace telling you the exact line that your error occurs on. This might be enough to tell you what your actual problem is.
Col

If image file not exist in image path crystal report not open and give me exception error problem

Hi guys my code below show pictures for all employees
code is working but i have proplem
if image not exist in path
crystal report not open and give me exception error image file not exist in path
although the employee no found in database but if image not exist in path when loop crystal report will not open
how to ignore image files not exist in path and open report this is actually what i need
my code below as following
DataTable dt = new DataTable();
string connString = "data source=192.168.1.105; initial catalog=hrdata;uid=sa; password=1234";
using (SqlConnection con = new SqlConnection(connString))
con.Open();
SqlCommand cmd = new SqlCommand("ViewEmployeeNoRall", con);
cmd.CommandType = CommandType.StoredProcedure;
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = cmd;
da.Fill(dt);
foreach (DataRow dr in dt.Rows)
FileStream fs = null;
fs = new FileStream("\\\\192.168.1.105\\Personal Pictures\\" + dr[0] + ".jpg", FileMode.Open);
BinaryReader br = new BinaryReader(fs);
byte[] imgbyte = new byte[fs.Length + 1];
imgbyte = br.ReadBytes(Convert.ToInt32((fs.Length)));
dr["Image"] = imgbyte;
fs.Dispose();
ReportDocument objRpt = new Reports.CrystalReportData2();
objRpt.SetDataSource(dt);
crystalReportViewer1.ReportSource = objRpt;
crystalReportViewer1.Refresh();
and exception error as below

First: I created a New Column ("Image") in a datatable of the dataset and change the DataType to System.Byte()
Second : Drag And drop this image Filed Where I want.
private void LoadReport()
frmCheckWeigher rpt = new frmCheckWeigher();
CryRe_DailyBatch report = new CryRe_DailyBatch();
DataSet1TableAdapters.DataTable_DailyBatch1TableAdapter ta = new CheckWeigherReportViewer.DataSet1TableAdapters.DataTable_DailyBatch1TableAdapter();
DataSet1.DataTable_DailyBatch1DataTable table = ta.GetData(clsLogs.strStartDate_rpt, clsLogs.strBatchno_Rpt, clsLogs.cmdeviceid); // Data from Database
DataTable dt = GetImageRow(table, "Footer.Jpg");
report.SetDataSource(dt);
crv1.ReportSource = report;
crv1.Refresh();
By this Function I merge My Image data into dataTable
private DataTable GetImageRow(DataTable dt, string ImageName)
try
FileStream fs;
BinaryReader br;
if (File.Exists(AppDomain.CurrentDomain.BaseDirectory + ImageName))
fs = new FileStream(AppDomain.CurrentDomain.BaseDirectory + ImageName, FileMode.Open);
else
// if photo does not exist show the nophoto.jpg file
fs = new FileStream(AppDomain.CurrentDomain.BaseDirectory + ImageName, FileMode.Open);
// initialise the binary reader from file streamobject
br = new BinaryReader(fs);
// define the byte array of filelength
byte[] imgbyte = new byte[fs.Length + 1];
// read the bytes from the binary reader
imgbyte = br.ReadBytes(Convert.ToInt32((fs.Length)));
dt.Rows[0]["Image"] = imgbyte;
br.Close();
// close the binary reader
fs.Close();
// close the file stream
catch (Exception ex)
// error handling
MessageBox.Show("Missing " + ImageName + "or nophoto.jpg in application folder");
return dt;
// Return Datatable After Image Row Insertion
Mark as answer or vote as helpful if you find it useful | Ammar Zaied [MCP]

Why am I receiving Null pointer Exception Error.

why am I receiving Null pointer Exception Error.
Hi I am developing a code for login screen. There is no syntex error as such ut I am receving the aove mentioned error. Can some one please help me ??
------------ Main.java------------------
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
public class Main implements ActionListener
Frame mainf;
MenuBar mb;
MenuItem List,admitform,inquiry,exit,helpn;
Menu newm,update,help;
Inquiry iq;
Admit ad;
// HosHelp hp;
Howuse hu;
Register reg;
Main()
mainf=new Frame(" Engg College V/S Mumbai University ");
     mb=new MenuBar();
     newm=new Menu(" New ");
     update=new Menu(" Update ");
     help=new Menu(" Help ");
     List=new MenuItem("List");
     admitform=new MenuItem("Admit");
     inquiry=new MenuItem("Inquiry");
     exit=new MenuItem("Exit");
     helpn=new MenuItem("How to Use?");
newm.add(List);
               newm.add(admitform);
newm.add(inquiry);
               newm.add(exit);
     help.add(helpn);
          mb.add(newm);
          mb.add(update);
          mb.add(help);
mainf.setMenuBar(mb);
               exit.addActionListener(this);
               List.addActionListener(this);
     inquiry.addActionListener(this);
     admitform.addActionListener(this);
helpn.addActionListener(this);
     mainf.setSize(400,300);
     mainf.setVisible(true);
public void actionPerformed(ActionEvent ae)
if (ae.getSource()==List)
          reg=new Register();
     if(ae.getSource()==inquiry)
     iq=new Inquiry();
if(ae.getSource()==admitform)
     ad=new Admit();
          if(ae.getSource()==helpn)
          hu=new Howuse();
          if(ae.getSource()==exit)
     mainf.setVisible(false);
public static void main(String args[])
          new Main();
-------------Register.java---------------------------
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
public class Register implements ActionListener//,ItemListener
Label id,name,login,pass,repass;
Button ok,newu,cancel,check;
Button vok,iok,lok,mok,sok; //buttons for dialog boxes
TextField idf,namef,loginf,passf,repassf;
Dialog valid,invlog,less,mismat,acucreat;
Frame regis;
Checkbox admin,limit;
CheckboxGroup type;
DBconnect db;
Register()
     db=new DBconnect();
regis=new Frame("Registeration Form");
          type=new CheckboxGroup();
          admin=new Checkbox("Administrator",type,true);
          limit=new Checkbox("Limited",type,false);
          id=new Label("ID :");
name=new Label("Name :");
     login=new Label("Login :");
     pass=new Label("Password :");
     repass=new Label("Retype :");
idf =new TextField(20); idf.setEnabled(false);
     namef=new TextField(30); namef.setEnabled(false);
loginf=new TextField(30); loginf.setEnabled(false);
     passf=new TextField(30); passf.setEnabled(false);
     repassf=new TextField(30); repassf.setEnabled(false);
ok=new Button("OK"); ok.setEnabled(false);
     newu=new Button("NEW");
cancel=new Button("Cancel");
     check=new Button("Check Login"); check.setEnabled(false);
vok=new Button("OK");
     iok=new Button("OK");
          lok=new Button("OK");
          mok=new Button("OK");
          sok=new Button("OK");
valid=new Dialog(regis,"Login name is valid !");
     invlog=new Dialog(regis,"Login name already exist!");
     less=new Dialog(regis,"Password is less than six characters !");
mismat=new Dialog(regis,"password & retyped are not matching !");
acucreat=new Dialog(regis,"You have registered successfully !");
     regis.setLayout(null);
//     regis.setBackground(Color.orange);
valid.setLayout(new FlowLayout());
     invlog.setLayout(new FlowLayout());
     less.setLayout(new FlowLayout());
     mismat.setLayout(new FlowLayout());
acucreat.setLayout(new FlowLayout());
id.setBounds(35,50,80,25); //(left,top,width,hight)
idf.setBounds(125,50,40,25);
name.setBounds(35,85,70,25);
namef.setBounds(125,85,150,25);
login.setBounds(35,120,80,25);
loginf.setBounds(125,120,80,25);
check.setBounds(215,120,85,25);
     pass.setBounds(35,155,80,25);
passf.setBounds(125,155,80,25);
repass.setBounds(35,190,80,25);
repassf.setBounds(125,190,80,25);
admin.setBounds(35,225,100,25);
limit.setBounds(145,225,100,25);
          ok.setBounds(45,265,70,25);
     newu.setBounds(135,265,70,25);
cancel.setBounds(225,265,70,25);
     passf.setEchoChar('*');
repassf.setEchoChar('*');
     regis.add(id);
     regis.add(idf);
regis.add(name);
     regis.add(namef);
     regis.add(login);
     regis.add(loginf);
     regis.add(check);
regis.add(pass);
     regis.add(passf);
regis.add(repass);
     regis.add(repassf);
     regis.add(ok);
     regis.add(newu);
     regis.add(cancel);
regis.add(admin);
     regis.add(limit);
valid.add(vok);
     invlog.add(iok);
     less.add(lok);
     mismat.add(mok);
acucreat.add(sok);
ok.addActionListener(this);
     newu.addActionListener(this);
check.addActionListener(this);
cancel.addActionListener(this);
     // limit.addItemListener(this);
     //admin.addItemListener(this);
          vok.addActionListener(this);
          iok.addActionListener(this);
     lok.addActionListener(this);
     mok.addActionListener(this);
     sok.addActionListener(this);
regis.setLocation(250,150);
regis.setSize(310,300);
regis.setVisible(true);
     public void actionPerformed(ActionEvent ae)
     if(ae.getSource()==check)
          try{
               String s2=loginf.getText();
ResultSet rs=db.s.executeQuery("select* from List");
                    while(rs.next())
               if(s2.equals(rs.getString(2).trim()))
//                    invlog.setBackground(Color.orange);
                         invlog.setLocation(250,150);
                         invlog.setSize(300,100);
               cancel.setEnabled(false);
ok.setEnabled(false);
check.setEnabled(false);
                    invlog.setVisible(true);
                         break;
                    else
                    //     valid.setBackground(Color.orange);
                         valid.setLocation(250,150);
                         valid.setSize(300,100);
               cancel.setEnabled(false);
ok.setEnabled(false);
check.setEnabled(false);
               valid.setVisible(true);
                    }catch(Exception e)
               e.printStackTrace();
if(ae.getSource()==newu)
     try{
          ResultSet rs=db.s.executeQuery("select max(ID) from List");
     while(rs.next())
String s1=rs.getString(1).trim();
               int i=Integer.parseInt(s1);
i++;
               String s2=""+i;
idf.setText(s2);
               newu.setEnabled(false);
               namef.setText(""); namef.setEnabled(true);
          loginf.setText(""); loginf.setEnabled(true);
          passf.setText(""); passf.setEnabled(true);
          repassf.setText(""); repassf.setEnabled(true);
          ok.setEnabled(true);
               check.setEnabled(true);
               }catch(Exception e)
          e.printStackTrace();
     if(ae.getSource()==ok)
          try
          String s1=idf.getText();
          String s2=loginf.getText();
          String s3=passf.getText();
     String s4=repassf.getText();
     int x=Integer.parseInt(s1);
     int t;
     if(type.getSelectedCheckbox()==admin)
          t=1;
          else
          t=0;
ResultSet rs=db.s1.executeQuery("select* from List");
               while(rs.next())
               if(s2.equals(rs.getString(2).trim()))
                    invlog.setBackground(Color.orange);
                    invlog.setLocation(250,150);
                    invlog.setSize(300,100);
               cancel.setEnabled(false);
ok.setEnabled(false);
check.setEnabled(false);
                    invlog.setVisible(true);
                    break;
               else
                    if (s3.length()<6)
                    less.setBackground(Color.orange);
                         less.setLocation(250,150);
                         less.setSize(300,100);
               ok.setEnabled(false);
                    cancel.setEnabled(false);
                    check.setEnabled(false);
                    less.setVisible(true);
else if(!(s3.equals(s4)))
                    mismat.setBackground(Color.orange);
                    mismat.setLocation(250,150);
                    mismat.setSize(300,100);
                    ok.setEnabled(false);
                    cancel.setEnabled(false);
                    check.setEnabled(false);
                    mismat.setVisible(true);
                    else
db.s1.execute("insert into User values("+x+",'"+s2+"','"+s3+"',"+t+")");
                    acucreat.setBackground(Color.orange);
                    acucreat.setLocation(250,150);
                    acucreat.setSize(300,100);
                    regis.setVisible(false);
                    acucreat.setVisible(true);
               }//else
          }//while
               } //try
          catch(Exception e1)
          // e1.printStackTrace();
          if (ae.getSource()==cancel)
          regis.setVisible(false);
          if (ae.getSource()==vok)
          ok.setEnabled(true);
               cancel.setEnabled(true);
check.setEnabled(true);
               valid.setVisible(false);
          if (ae.getSource()==iok)
          ok.setEnabled(true);
               cancel.setEnabled(true);
check.setEnabled(true);
               invlog.setVisible(false);
          if (ae.getSource()==lok)
          less.setVisible(false);
               cancel.setEnabled(true);
ok.setEnabled(true);
check.setEnabled(true);
          if (ae.getSource()==mok)
          mismat.setVisible(false);
               cancel.setEnabled(true);
ok.setEnabled(true);
check.setEnabled(true);
if (ae.getSource()==sok)
          acucreat.setVisible(false);
          ok.setEnabled(false);
               newu.setEnabled(true);
               regis.setVisible(true);
     public static void main(String args[])
     new Register();
-----------DBConnect.java------------------------------------
import java.sql.*;
public class DBconnect
Statement s,s1;
Connection c;
public DBconnect()
try
     Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
          c=DriverManager.getConnection("jdbc:odbc:Sonal");
          s=c.createStatement();
s1=c.createStatement();
     catch(Exception e)
     e.printStackTrace();
----------Login.java----------------
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
public class Login implements ActionListener
Frame log;
Label login,pass;
TextField loginf,passf;
Button ok,cancel;
Dialog invalid;
Button iok;
Register reg;
DBconnect db;
Main m;
Login()
db=new DBconnect();
     log=new Frame();
     log.setLocation(250,210);
     login=new Label("Login :");
pass=new Label("Password :");
     loginf=new TextField(20);
     passf=new TextField(20);
     passf.setEchoChar('*');
     ok=new Button("OK");
     // newu=new Button("New User");
     cancel=new Button("CANCEL");
     iok=new Button(" OK ");
invalid=new Dialog(log,"Invalid User!");
//log.setBackground(Color.cyan);
//log.setForeground(Color.black);
     log.setLayout(null);
     // iok.setBackground(Color.gray);
     invalid.setLayout(new FlowLayout());
     login.setBounds(35,50,70,25); //(left,top,width,hight)
     loginf.setBounds(105,50,100,25);
     pass.setBounds(35,85,70,25);
     passf.setBounds(105,85,70,25);
     ok.setBounds(55,130,70,25);
// newu.setBounds(85,120,80,25);
cancel.setBounds(145,130,70,25);
log.add(login);
log.add(loginf);
log.add(pass);
log.add(passf);
log.add(ok);
// log.add(newu);
log.add(cancel);
     invalid.add(iok);//,BorderLayout.CENTER);
ok.addActionListener(this);
// newu.addActionListener(this);
cancel.addActionListener(this);
     iok.addActionListener(this);
log.setSize(300,170);
log.setVisible(true);
public void actionPerformed(ActionEvent a)
if(a.getSource()==ok)
     try{
          String l=loginf.getText();
          String p=passf.getText();
          ResultSet rs=db.s.executeQuery("select * from List");
          while(rs.next())
          if(l.equals(rs.getString(2).trim())&& p.equals(rs.getString(3).trim()))
                    String tp=rs.getString(4).trim();
                         int tp1=Integer.parseInt(tp);
log.setVisible(false);
if(tp1==1)
                         m=new Main();
                    // m.List.setEnabled(true);
                         else
                         m=new Main();
                         m.List.setEnabled(false);
                    break;
else
               invalid.setBackground(Color.orange);
               invalid.setSize(300,100);
               invalid.setLocation(250,210);
               cancel.setEnabled(false);
          ok.setEnabled(false);
               invalid.setVisible(true);
               }catch(Exception e1)
               e1.printStackTrace();
     if (a.getSource()==cancel)
     log.setVisible(false);
     if (a.getSource()==iok)
     invalid.setVisible(false);
     loginf.setText("");
     passf.setText("");
     cancel.setEnabled(true);
ok.setEnabled(true);
     public static void main(String[] args)
     new Login();
-------------inquiry.java---------------------------------
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.util.Date;
import java.text.*;
import java.sql.*;
public class Inquiry implements ActionListener
Frame inqry;
Label name,addr;
TextField namef,addrf;
Button ok,cancel,dok;
Dialog invalid;
Frame result; //Result of the inquiry....
Label lrname,lraddr,lward,lrdate,lcdate;
TextField rname,raddr,ward,rdate,cdate;
Date d;
DateFormat df;
Button rok,rcancel;
Dialog success;
Button rdok;
DBconnect db;
Inquiry()
          db=new DBconnect();
          inqry=new Frame("Inquiry Form");
          inqry.setLayout(null);
inqry.setBackground(Color.cyan);
          name=new Label(" NAME ");
          addr=new Label("ADDRESS");
          namef=new TextField(20);
          addrf=new TextField(20);
          ok=new Button("OK");
          cancel=new Button("CANCEL");
          dok=new Button("OK");
          invalid=new Dialog(inqry,"Invalid Name or Address !");
          invalid.setSize(300,100);
     invalid.setLocation(300,180);
          invalid.setBackground(Color.orange);
          invalid.setLayout(new FlowLayout());
result=new Frame(" INQUIRY RESULT "); //Result Window......
result.setLayout(null);
result.setBackground(Color.cyan);
lcdate=new Label(" DATE ");
     lrname=new Label(" NAME ");
lraddr=new Label(" ADDRESS ");
     lward=new Label(" WARD ");
     lrdate=new Label(" ADMIT-DATE ");
cdate=new TextField(10);
     rname=new TextField(20);
rname.setEnabled(false);
     raddr=new TextField(20);
     raddr.setEnabled(false);
     ward=new TextField(20);
     ward.setEnabled(false);
     rdate=new TextField(10);
     rdate.setEnabled(false);
     cdate=new TextField(20);
     d=new Date();
     df=DateFormat.getDateInstance(DateFormat.MEDIUM,Locale.KOREA);
     cdate.setText(df.format(d));
     cdate.setEnabled(false);
rok=new Button(" OK ");
     rcancel=new Button("CANCEL");
          name.setBounds(40,50,50,25);
namef.setBounds(120,50,130,25);
addr.setBounds(40,100,60,25);
addrf.setBounds(120,100,80,25);
ok.setBounds(60,145,70,25);
          cancel.setBounds(140,145,70,25);
          lcdate.setBounds(200,50,60,25); //Result Window......
cdate.setBounds(270,50,80,25);
lrname.setBounds(35,85,70,25);
rname.setBounds(140,85,180,25);
lraddr.setBounds(35,120,80,25);
     raddr.setBounds(140,120,100,25);
lward.setBounds(35,155,80,25);
ward.setBounds(140,155,100,25);
lrdate.setBounds(30,190,80,25);
rdate.setBounds(140,190,80,25);
rok.setBounds(70,240,70,25);
rcancel.setBounds(170,240,70,25);
          inqry.add(name);
          inqry.add(namef);
          inqry.add(addr);
          inqry.add(addrf);
          inqry.add(ok);
          inqry.add(cancel);
invalid.add(dok);
     result.add(lcdate); //Result Window......
     result.add(cdate);
          result.add(lrname);
          result.add(rname);
          result.add(lraddr);
          result.add(raddr);
          result.add(lward);
          result.add(ward);
          result.add(lrdate);
          result.add(rdate);
          result.add(rok);
          result.add(rcancel);
     ok.addActionListener(this);
     cancel.addActionListener(this);
     dok.addActionListener(this);
rok.addActionListener(this); //Result Window......
     rcancel.addActionListener(this);
     inqry.setSize(280,180);
     inqry.setLocation(300,180);
     inqry.setVisible(true);
          result.setSize(400,280); //Result Window......
     result.setLocation(200,150);
     result.setVisible(false);
          public void actionPerformed(ActionEvent ae)
               if(ae.getSource()==ok)
               try
                         String nm=namef.getText();
                         String ad=addrf.getText();
                         inqry.setVisible(false);
                         ResultSet rs=db.s.executeQuery("select * from Billinformation");
                         while(rs.next())
                              String nm1=rs.getString(2).trim();
                              String ad1=rs.getString(3).trim();
                              int k=0;
                              if((nm1.equals(nm))&&(ad1.equals(ad)))
                         String adm=rs.getString(5).trim();
                         String wr=rs.getString(6).trim();
                         String bd=rs.getString(8).trim();
                              String wrb=wr+"-"+bd;
result.setVisible(true);
                              rname.setText(nm1);
                         raddr.setText(ad1);
                         ward.setText(wrb);
                         rdate.setText(adm);
k=1;
                              break;
                              }//if
                         else if(k==1)
                         invalid.setVisible(true);
                         }//while
}//try
                         catch(Exception e)
                         e.printStackTrace();
                    } //getsource ==ok
               if(ae.getSource()==cancel)
inqry.setVisible(false);
                    if(ae.getSource()==rok) //Result Window......
                    namef.setText("");
                         addrf.setText("");
                         result.setVisible(false);
                    inqry.setVisible(true);
if(ae.getSource()==rcancel)
result.setVisible(false);
                    if(ae.getSource()==dok)
                    namef.setText("");
                         addrf.setText("");
                         invalid.setVisible(false);
                         inqry.setVisible(true);
     public static void main(String args[])
          new Inquiry();
PLease Help me !!
I need this urgently.

can you explain what your program tries to do... and
at where it went wrong..Sir,
We are trying to make an project where we can make a person register in our data base & after which he/she can search for other user.
The logged in user can modify his/her own data but can view other ppl's data.
We are in a phase of registering the user & that's where we are stuck. The problem is that after the login screen when we hit register (OK- button) the data are not getting entered in the data base.
Can u please help me??
I am using "jdk1.3' - studnet's edition.
I am waiting for your reply.
Thanks in advance & yr interest.

NullPointer Exception Error

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