NullPointer

whenever i run my Program it will show tis...
So wat is the possiblity of the problem tat lie behind?
java.lang.NullPointerException
     at sun.applet.AppletViewer.parse(AppletViewer.java:1025)
     at sun.applet.AppletViewer.parse(AppletViewer.java:970)
     at sun.applet.Main.run(Main.java:135)
     at sun.applet.Main.main(Main.java:77)
WARNING: Canvas3D constructed with a null GraphicsConfiguration

when i end my program it will display this
Exception in thread "main"

Similar Messages

NullPointer exception in request.getParameter().indexof(.....) only in 6.1

Hi
I have one full working application (containing WAR + JAR) files.
Right now this application is working absolutely fine in weblogic 6.0 sp1 on
WINNT & Solaris.
In this application, we accept events to save data from external
applications like excel files.
Now code in JSP is -->
Line 1: String Data = request.getParameter("data");
Line 2: Data.indexof(........);
Now in case of weblogic 6.1, i am getting NullPointer Exception in line 2,
but I am NOT getting any exception in case of weblogic 6.0sp1.
To my surprise, I am also printing request obj parameters values, whenever
jsp get called from external source, there it is printing value of "data".
I am totally clueless!!
Any idea plz?
Ashish Jain

Looking very closely at request object contents..
Wht i am sending (posting) from excel file-->
xmlData=<?xml version="1.0" encoding="UTF-8"?><reportSheet bu="SHKXXX"
report="PBrandContr" sheet=
"PBrandContr" year="2002" coType="A" status="0" brId="PIC" act_brId="PIC"
opt="P" ></reportSheet>
But 6.1 interprets like this ---->
key is --------> xmlData=<?xml version="1.0" encoding="UTF-8"?><reportSheet
bu="SHKXXX" report="PBrandContr" sheet=
"PBrandContr" year="2002" coType="A" status="0" brId="PIC" act_brId
And Value is -------> "PIC" opt="P" ></reportSheet>
This thing is causing all problems.
I am not observing this kinda behaviour in 6.0sp1.
Thanks
Ashish Jain
"Ashish Jain" <[email protected]> wrote in message
news:[email protected]..
Hi
I have one full working application (containing WAR + JAR) files.
Right now this application is working absolutely fine in weblogic 6.0 sp1on
WINNT & Solaris.
In this application, we accept events to save data from external
applications like excel files.
Now code in JSP is -->
Line 1: String Data = request.getParameter("data");
Line 2: Data.indexof(........);
Now in case of weblogic 6.1, i am getting NullPointer Exception in line 2,
but I am NOT getting any exception in case of weblogic 6.0sp1.
To my surprise, I am also printing request obj parameters values,whenever
jsp get called from external source, there it is printing value of "data".
I am totally clueless!!
Any idea plz?
Ashish Jain

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.

Nullpointer on com.sap.tc.webdynpro.progmodel.controller.MessageManager

Dear all,
i have two web dynpro components, say A and B.
A is using component B.
When i push a close button in B, i do the following things:
1. wdComponentAPI.getMessageManager().reportWarning("Some warning!!!");
2. wdThis.wdGetICLRequestDetailsController().leaveRequestDetails();
This leaveRequestDetails() fires a plug (standard) to leave back to my component A and component A deletets the componentUsage when needed... ( if(hasActiveComponent()) )
Component B has a view with an inputfield for an amount (bigdecimal). When this has valid input and i push the button and execute 1. and 2. everything works fine and i see the warning on the view of my comp. A.
When i put invalid input in the amount field ( for example some characters) and i push the button, i see an error message on my view in comp. B. (automatic validation)
When i correct the input and push the submit button again while the previous error message is still visible on the screen (so there's no event trigerred since the automatic validation), i get the following nullpointer exception on calling the deleteComponent method in component A:
java.lang.NullPointerException
+     at com.sap.tc.webdynpro.progmodel.controller.MessageManager.setAttributeValidbyContext(MessageManager.java:656)+
+     at com.sap.tc.webdynpro.progmodel.context.NodeElement.clearPendingInput(NodeElement.java:297)+
+     at com.sap.tc.webdynpro.progmodel.context.NodeElement.exit(NodeElement.java:132)+
+     at com.sap.tc.webdynpro.progmodel.context.Node$ElementList.exit(Node.java:1859)+
+     at com.sap.tc.webdynpro.progmodel.context.Node.clearElements(Node.java:1560)+
+     at com.sap.tc.webdynpro.progmodel.context.Node.forgetDataNode(Node.java:1733)+
+     at com.sap.tc.webdynpro.progmodel.context.Node.exit(Node.java:295)+
+     at com.sap.tc.webdynpro.progmodel.context.Node.exit(Node.java:306)+
+     at com.sap.tc.webdynpro.progmodel.context.Context.exit(Context.java:53)+
+     at com.sap.tc.webdynpro.progmodel.controller.Controller.exit(Controller.java:161)+
+     at com.sap.tc.webdynpro.progmodel.view.View.exitController(View.java:403)+
+     at com.sap.tc.webdynpro.progmodel.view.View.exitController(View.java:435)+
+     at com.sap.tc.webdynpro.progmodel.controller.Controller.exit(Controller.java:154)+
+     at com.sap.tc.webdynpro.progmodel.view.ViewManager.exit(ViewManager.java:125)+
+     at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.exit(ClientComponent.java:211)+
+     at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.deleteComponent(ClientComponent.java:195)+
+     at com.sap.tc.webdynpro.progmodel.components.ComponentUsage.deleteComponent(ComponentUsage.java:199)+
When i do the same again, but without reporting the warning before leaving comp B, i don't get the nullpointer exception and can continue interacting on my view in component A.
Can anyone tell me what's the cause for this nullpointer? is it a bug?
Kind regards.
J.

The following is a working solution for me:
MessageManager mManager = (MessageManager)wdComponentAPI.getMessageManager();
mManager.reset();
I have put these lines right before i call the deleteComponent() method in my web dynpro component A.

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

Nullpointer in 'weblogic.transaction.internal.CoordinatorImpl

          I am using Weblogic 6.1 SP4 on JDK 1.3.1 on AIX.
          My server has a transacted EJB which accesses Oracle and DB2 databases. I have
          been running my application for several months.
          Suddenly, yesterday it starting spitting out these exceptions a few times a minute.
          I cannot find the configuration change I made that would have caused this to
          suddenly start appearing. My code has not changed in 2 weeks.
          Has anyone seen this error before? Does anyone know what causes this, so that
          I can narrow my search?
          Thanks for your help,
          Tania
          ####<Mar 4, 2003 12:35:48 PM CST> <Warning> <Dispatcher> <ksp12025> <cuAS01> <ExecuteThread:
          '5' for queue: 'default'> <system> <> <000000> <RuntimeException thrown by rmi
          server: 'weblogic.rmi.internal.BasicServerRef@105 - jvmid: '-4285102758410085945S:10.1.21.21:[18120,18120,18121,18121,18120,18121,-1]:qdomain4:cuAS01',
          oid: '261', implementation: 'weblogic.transaction.internal.CoordinatorImpl@311671da''>
          java.lang.NullPointerException
          at weblogic.transaction.internal.ServerResourceInfo.isAccessibleAtAndAssignableTo(ServerResourceInfo.java(Compiled
          Code))
          at weblogic.transaction.internal.ServerTransactionImpl.assignResourcesToSelf(ServerTransactionImpl.java(Compiled
          Code))
          at weblogic.transaction.internal.ServerTransactionImpl.assignResourcesToSelf(ServerTransactionImpl.java(Compiled
          Code))
          at weblogic.transaction.internal.ServerTransactionImpl.localCommit(ServerTransactionImpl.java(Compiled
          Code))
          at weblogic.transaction.internal.SubCoordinatorImpl.startCommit(SubCoordinatorImpl.java(Compiled
          Code))
          at weblogic.transaction.internal.CoordinatorImpl_WLSkel.invoke(Unknown
          Source)
          at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java(Compiled
          Code))
          at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java(Compiled
          Code))
          at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java(Compiled
          Code))
          at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java(Compiled Code))
          at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)


          Thanks,
          The problem did clear up when the Unix server had to get bounced. I believe it
          was bounced for an unrelated issue.
          The one thing I noticed was that there were a couple of copies of my EJBs in the
          wlnotdelete directory that the server had been previously compliaining about.
          They went away after the Unix server was restarted and the NullPointer problem
          went away.
          We plan to upgrade to 7.1 soon, but will try to move to SP5 if we need to sooner.
          Thanks for your help.
          Tania Rhinehart
          Rajesh Mirchandani <[email protected]> wrote:
          >This is fixed in SP5. Open a case with [email protected] and reference
          >CR092301.
          >
          >Slava Imeshev wrote:
          >
          >> Hi Tania,
          >>
          >> I think you need to contact BEA support at [email protected]
          >>
          >> Regards,
          >>
          >> Slava Imeshev
          >>
          >> "Tania Rhinehart" <[email protected]> wrote in message
          >> news:[email protected]...
          >> >
          >> > I am using Weblogic 6.1 SP4 on JDK 1.3.1 on AIX.
          >> > My server has a transacted EJB which accesses Oracle and DB2 databases.
          > I
          >> have
          >> > been running my application for several months.
          >> > Suddenly, yesterday it starting spitting out these exceptions a few
          >times
          >> a minute.
          >> > I cannot find the configuration change I made that would have caused
          >this
          >> to
          >> > suddenly start appearing. My code has not changed in 2 weeks.
          >> >
          >> > Has anyone seen this error before? Does anyone know what causes
          >this, so
          >> that
          >> > I can narrow my search?
          >> >
          >> > Thanks for your help,
          >> > Tania
          >> >
          >> > ####<Mar 4, 2003 12:35:48 PM CST> <Warning> <Dispatcher> <ksp12025>
          >> <cuAS01> <ExecuteThread:
          >> > '5' for queue: 'default'> <system> <> <000000> <RuntimeException
          >thrown by
          >> rmi
          >> > server: 'weblogic.rmi.internal.BasicServerRef@105 - jvmid:
          >> '-4285102758410085945S:10.1.21.21:[18120,18120,18121,18121,18120,18121,-1]:q
          >> domain4:cuAS01',
          >> > oid: '261', implementation:
          >> 'weblogic.transaction.internal.CoordinatorImpl@311671da''>
          >> >
          >> > java.lang.NullPointerException
          >> > at
          >> weblogic.transaction.internal.ServerResourceInfo.isAccessibleAtAndAssignable
          >> To(ServerResourceInfo.java(Compiled
          >> > Code))
          >> > at
          >> weblogic.transaction.internal.ServerTransactionImpl.assignResourcesToSelf(Se
          >> rverTransactionImpl.java(Compiled
          >> > Code))
          >> > at
          >> weblogic.transaction.internal.ServerTransactionImpl.assignResourcesToSelf(Se
          >> rverTransactionImpl.java(Compiled
          >> > Code))
          >> > at
          >> weblogic.transaction.internal.ServerTransactionImpl.localCommit(ServerTransa
          >> ctionImpl.java(Compiled
          >> > Code))
          >> > at
          >> weblogic.transaction.internal.SubCoordinatorImpl.startCommit(SubCoordinatorI
          >> mpl.java(Compiled
          >> > Code))
          >> > at
          >> weblogic.transaction.internal.CoordinatorImpl_WLSkel.invoke(Unknown
          >> > Source)
          >> > at
          >> weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java(Compiled
          >> > Code))
          >> > at
          >> weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java(Compi
          >> led
          >> > Code))
          >> > at
          >> weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java(C
          >> ompiled
          >> > Code))
          >> > at
          >> weblogic.kernel.ExecuteThread.execute(ExecuteThread.java(Compiled Code))
          >> > at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
          >> >
          >
          >--
          >Rajesh Mirchandani
          >Developer Relations Engineer
          >BEA Support
          >
          >

NullPointer when GUI calls method in Client

Hi, I'm relatively new to Java programming and this conference.
I hope the following is not too long winded.
I'm trying to programme a FTP Client which is controlled by a GUI.
My JBuilder project has three classes:
ClientGUI.java and ClientFrame.java (produced with JBUilder's New Application option)
plus AClient.java (this is the 'engine' of the project).
ClientGUI constructs an instance 'frame' of ClientFrame which in turn constructs an instance 'client' of AClient.
The call to the AClient constructor has to be in a try/catch statement,
and takes a JTextArea as a parameter from ClientFrame to allow 'client' to display messges in my GUI.
The AClient constructor opens the Socket connection to a simple server on the same computer.
This part works.
However, when I attempt to use events generated by buttons in my GUI ('frame')to call methods in 'client', I get the following null-pointer exception:-
java.lang.NullPointerException
at ClientFrame.jButton1_actionPerformed(ClientFrame.java:219)
at ClientFrame_jButton1_actionAdapter.actionPerformed(ClientFrame.java:274)
etc...
etc...
These refer to code blocks:-
    if ( client.isAlive() ) { /*line 219*/
      System.out.println("client alive");
    }where isAlive() is a simple test method that returns true,
and
public void actionPerformed(ActionEvent e) {
    adaptee.jButton1_actionPerformed(e); /*line 274*/
}'client' is listed as a public field in ClientFrame and is instanciated, so why do I have this problem?
Enclosing the call in a try/catch statement doesn't help.
Thanks in advance. Laurence

The NullPointer means that the client was not instantiated, though you may think it has been.
Make sure that you are instantiating the correct variable, for instance, if you have a class-level field called client you would do something like this:
public class WhateverClass {
private AClient client;
//other stuff
public WhateverClass(...) {
    client = //assignment either
             //with new AClient(...)
             //or something else
}You would NOT do:
public class WhateverClass {
private AClient client;
//other stuff
public WhateverClass(...) {
    AClient client = //assignment either
                     //with new AClient(...)
                     //or something else
}Since this would create a second variable of name client that only has scope within the constructor.
Also, if the client is being assigned through a parameter in the constructor, check to make sure that that you are not passing a null value along... Do a System.out.println(client) after the assignement and see what you get. Then you know if the problem occurs in this class or in the class that creates the AClient reference to begin with...

Nullpointer when starting application.

Sometimes when i start my application with java web start, a nullpointer exception accurs, but it doesn't affect the application. And seems to happen randomly.
Exception in thread "Thread-3" java.lang.NullPointerException
at com.sun.javaws.Launcher$2.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
The application still starts, and apparently runs without problems.
Can anyone explain this?
/Kenneth

hi Sid,
Thanks problem was the way I was accessing the values. But still its not clear how error was coming in wdMOdify method when at start it should not run at the load time.
And (!firsttime) can be used in case something is modify and screen rendering has happened more than once.
Regards

Query using SDO in JDeveloper - NullPointer

I have this java lines for query:
DocsOddcModuleServiceImpl docs = new DocsOddcModuleServiceImpl();
FindCriteria findCriteria = new FindCriteriaImpl();
FindControl findControl = new FindControlImpl();
DocsOddcVOSDOResult result = docs.findDocsOddcVO1buscarDocsOddcPorIdInstancia(findCriteria, 1L, findControl);
List resultList = result.getValue();
int total = resultList.size();
System.out.println("total eh " + total);
Problem: at this line "DocsOddcVOSDOResult result = docs.findDocsOddcVO1buscarDocsOddcPorIdInstancia(findCriteria, 1L, findControl);" i get a nullpointer exception.
<Apr 28, 2011 5:06:54 PM BRT> <Error> <solicitarcadastamentodeveiculosui.dataservices.server.serviceinterface.DocsOddcModuleServiceImpl> <BEA-000000> <
java.lang.NullPointerException
     at oracle.jbo.server.svc.ServiceImpl.acquireResources(ServiceImpl.java:377)
     at oracle.jbo.server.svc.ServiceImpl.find(ServiceImpl.java:2288)
     at solicitarcadastamentodeveiculosui.dataservices.server.serviceinterface.DocsOddcModuleServiceImpl.findDocsOddcVO1buscarDocsOddcPorIdInstancia(DocsOddcModuleServiceImpl.java:117)
     at solicitarcadastamentodeveiculosui.bean.OddcBean.popularTabela(OddcBean.java:47)
     at solicitarcadastamentodeveiculosui.bean.OddcBean.init(OddcBean.java:39)
I have a simple table at oracle database, i use the jdeveloper to generate a View Object / View Criteria and Service Interface (SDO), and i want to make a simple query:
Select * from table where idInstancia = "idInstancia" (Bind Variable - Type - Long)
I am feeling that my problem is at findCriteria and findControl. I instantiate these variables, but i'm not populating.
Should i use the setter method ? What ?
Thanks
Victor Jabur

Yeah, you are right on, if you haven't guessed it in the last couple of months ;-)
fecthStart, fetchSize, and excludeAttribute are all required property for FindCriteria.
retrieveAllTranslations is a required property for FindControl.

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

JUTreeNodeBinding question (nullpointer exception in getAttribute)

Hi,
I've got a question about a piece of code. I've used a JTree which displays a recursive tree, which is working fine. I want to do something when a node is selected. I have the following piece of code:
jTree1.addTreeSelectionListener(
   new TreeSelectionListener()
     public void valueChanged(TreeSelectionEvent e)
       DefaultMutableTreeNode node = (DefaultMutableTreeNode)jTree1.getLastSelectedPathComponent();
       if (node != null)
         JUTreeNodeBinding tnb = (JUTreeNodeBinding)(node.getUserObject());
         if (tnb!=null)
   });this code is taken from some example I've read on this forum and slightly modified (I can't find the original posting).
Now, according to the sourcecompletion feature, tnb has methods like getAttribute, getAttributeDef. But when I call one of these methods on tnb (where the '...' is in the example above), I always get a nullpointer exception , somewhere inside the getAttribute call. (the variable 'tnb' itself is not null)
Why wouldn't this work? Shouldn't the getAttribute calls give me access to the attributes of the row from the view that corresponds the selected element?
The logwindow shows this for the nullpointer exception:
Exception occurred during event dispatching:
java.lang.NullPointerException
     oracle.jbo.AttributeDef[] oracle.jbo.uicli.binding.JUCtrlValueBinding.getAttributeDefs()
          JUCtrlValueBinding.java:173
     oracle.jbo.AttributeDef oracle.jbo.uicli.binding.JUCtrlValueBinding.getAttributeDef(int)
          JUCtrlValueBinding.java:239
     void mypackage.PMyData$1.valueChanged(javax.swing.event.TreeSelectionEvent)
          PMyData.java:332
     void javax.swing.JTree.fireValueChanged(javax.swing.event.TreeSelectionEvent)
          JTree.java:2269
     void javax.swing.JTree$TreeSelectionRedirector.valueChanged(javax.swing.event.TreeSelectionEvent)
          JTree.java:2575
     void javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(javax.swing.event.TreeSelectionEvent)
          DefaultTreeSelectionModel.java:612
     void javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(java.util.Vector, javax.swing.tree.TreePath)
          DefaultTreeSelectionModel.java:1006
     void javax.swing.tree.DefaultTreeSelectionModel.setSelectionPaths(javax.swing.tree.TreePath[])
          DefaultTreeSelectionModel.java:288
     void javax.swing.tree.DefaultTreeSelectionModel.setSelectionPath(javax.swing.tree.TreePath)
          DefaultTreeSelectionModel.java:171
     void javax.swing.JTree.setSelectionPath(javax.swing.tree.TreePath)
          JTree.java:1088
     void javax.swing.plaf.basic.BasicTreeUI.selectPathForEvent(javax.swing.tree.TreePath, java.awt.event.MouseEvent)
          BasicTreeUI.java:2117
     void javax.swing.plaf.basic.BasicTreeUI$MouseHandler.mousePressed(java.awt.event.MouseEvent)
          BasicTreeUI.java:2683
     void java.awt.Component.processMouseEvent(java.awt.event.MouseEvent)
          Component.java:3712
     void java.awt.Component.processEvent(java.awt.AWTEvent)
          Component.java:3544
     void java.awt.Container.processEvent(java.awt.AWTEvent)
          Container.java:1164
     void java.awt.Component.dispatchEventImpl(java.awt.AWTEvent)
          Component.java:2593
     void java.awt.Container.dispatchEventImpl(java.awt.AWTEvent)
          Container.java:1213
     void java.awt.Component.dispatchEvent(java.awt.AWTEvent)
          Component.java:2497
     void java.awt.LightweightDispatcher.retargetMouseEvent(java.awt.Component, int, java.awt.event.MouseEvent)
          Container.java:2451
     boolean java.awt.LightweightDispatcher.processMouseEvent(java.awt.event.MouseEvent)
          Container.java:2210
     boolean java.awt.LightweightDispatcher.dispatchEvent(java.awt.AWTEvent)
          Container.java:2125
     void java.awt.Container.dispatchEventImpl(java.awt.AWTEvent)
          Container.java:1200
     void java.awt.Window.dispatchEventImpl(java.awt.AWTEvent)
          Window.java:926
     void java.awt.Component.dispatchEvent(java.awt.AWTEvent)
          Component.java:2497
     void java.awt.EventQueue.dispatchEvent(java.awt.AWTEvent)
          EventQueue.java:339
     boolean java.awt.EventDispatchThread.pumpOneEventForHierarchy(java.awt.Component)
          EventDispatchThread.java:131
     void java.awt.EventDispatchThread.pumpEventsForHierarchy(java.awt.Conditional, java.awt.Component)
          EventDispatchThread.java:98
     void java.awt.EventDispatchThread.pumpEvents(java.awt.Conditional)
          EventDispatchThread.java:93
     void java.awt.EventDispatchThread.run()
          EventDispatchThread.java:85

Bit of a coincidence.. I was just running into the same problem. But if you check getAttributeDefs(), you'll see that there only is one attribute available, namely the one that is being displayed in the tree. (the 'description'-attribute)
Or at least, that's the case with my sitation.
I would love to be able to address all available attributes, eg. foreign key fields, but that doesn't seem possible.
At the moment, I'm using the following work-around, which of course is far from ideal:
Key key = tnb.getRowKey();
ViewObject vo = panelBinding.getApplicationModule().findViewObject("SomeVO");
Row[] rows = vo.findByKey(key);
if (rows == null || rows.length != 1)
System.out.println("Notice: not 1 rows");
return;
Row row = rows[0];
// now you can fetch all the attributes

Getting nullpointer exception in Tomcap using getRealPath()

Hi,
I have the following code snippet, but getting nullpoint exception when I try to read a file in jsp.
String realPath = this.getServletConfig().getServletContext().getRealPath("//AUDIT_TRAIL.xml");
File fileDef = new File(realPath);
Can someone tell me what I am doing wrong, or how i can read a file in jsp that works in tomcat 5

why the double slash? / is not a special character ( b]backslash is, and so you would need \\)
The file is sitting in the root of your web app?
String realPath = this.getServletConfig().getServletContext().getRealPath("/AUDIT_TRAIL.xml");
// and if it doesn't work, try this to see what it IS looking up
String realPath1 = this.getServletConfig().getServletContext().getRealPath("/");
System.out.println(realPath1);If you ware loading a file, you might consider using the getResourceAsStream() method.
Cheers,
evnafets

NullPointer Exception in SetCharacterEncodingFilter

Hi All..!
Can any one help me out in Fixing the Nullpointer Exception raised from SetCharacterEncodingFilter class which was taken by me from the Tomact ServletExamples. What should be the reason for this exception ? and how to fix this problem. Thanks in Advance to all the Gurus..!
Please find the Stacktrace of the generated Exception
java.lang.NullPointerException
at org.apache.jsp.welcome_jsp._jspService(welcome_jsp.java:65)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at MalikJspPackages.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:81)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:595)
NotifyUtil::java.net.SocketException: Software caused connection abort: recv failed
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:256)
at java.io.BufferedInputStream.read(BufferedInputStream.java:313)
at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:606)
at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:554)
at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:571)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:928)
at org.netbeans.modules.web.monitor.server.NotifyUtil$RecordSender.run(NotifyUtil.java:248)

Look up the createImage(int width, int height) method in the Component api abd follow the link to its description in the Method Detail section. Note that this method will return null if the component is not displayable. Try placing your inspection code after the call to setVisible.

NullPointer from constructor of oracle.sql.ARRAY

This is a strange one, I'm hoping someone has seen this before.
I'm seeing a nullpointer exception from the contructor of ARRAY(ArrayDescriptor, Connection, Object)
This occurs when I'm trying to make a call from an application module to a stored procedure with custom database types.
This seems to work fine in the embedded OC4J instance but fails when deployed to an application server on linux. The version is 10.1.2.
thanks for your help.
Joel
Here is the part of the stack trace:
java.lang.NullPointerException
     at oracle.jdbc.driver.PhysicalConnection.isDescriptorSharable(PhysicalConnection.java:5078)
     at com.evermind.sql.OracleConnectionBCELProxy__oracle_jdbc_driver_T4CConnection__SQLBCELProxy.isDescriptorSharable()
     at oracle.sql.ARRAY.<init>(ARRAY.java:118)
     at fastenal.website.model.services.products.ProductsServiceImpl.getPrices(ProductsServiceImpl.java:121)
and relevant source code:
public ProductPrices[] getPrices(String[] skus, Number accountNumberId, Number userId, Number catalogId){
OracleCallableStatement st = null;
try {
Connection con = getCurrentConnection();
System.out.println(con.getClass().toString() );
// Create the type object
Map map = con.getTypeMap();
//map.put("SKU_DETAIL_TYPE", Class.forName("fastenal.integration.ws.products.ProductDetailSqlType"));
map.put("WEB_PRICE_TYPE", ProductPriceSqlType.class);
con.setTypeMap(map);
ProductPriceSqlType[] pricesSql = new ProductPriceSqlType[skus.length];
for (int i = 0; i < skus.length; i++) {
pricesSql[i] = new ProductPriceSqlType("WEB_PRICE_TYPE", 0d, 0d, 0d, skus, null);
//ProductDetailSqlType productsSQL = new
ArrayDescriptor arrayDesc = ArrayDescriptor.createDescriptor("WEB_PRICE_TYPE_ARRAY", con);
ARRAY prices = new ARRAY(arrayDesc, con, pricesSql);
st = (OracleCallableStatement)getDBTransaction().createCallableStatement( PRICING_PLSQL
, DBTransaction.DEFAULT);
st.registerOutParameter(1, Types.ARRAY, "WEB_PRICE_TYPE_ARRAY");
st.setARRAY(2, prices);
//st.setString(3, strAccountNumber);
if (accountNumberId!=null){
st.setInt(3, accountNumberId.intValue() );
}else{
st.setNull(3, Types.NUMERIC );
if (userId!=null){
st.setInt(4, userId.intValue() );
}else{
st.setNull(4, Types.NUMERIC );
if (catalogId!=null){
st.setInt(5, catalogId.intValue() );
}else{
st.setNull(5, Types.NUMERIC );
st.execute();
prices = st.getARRAY(1);
Object[] retVals = (Object[])prices.getArray();
ProductPrices[] prodPrices = new ProductPrices[retVals.length];
for (int i = 0; i < retVals.length; i++) {
ProductPrices currPrices = new ProductPrices();
ProductPriceSqlType sqlType = (ProductPriceSqlType)retVals[i];
Double customPrice;
if (sqlType.getCustomPrice()!=null){
customPrice = new Double(sqlType.getCustomPrice().doubleValue() );
}else{
customPrice=null;
Double promoPrice;
if (sqlType.getPromoPrice()!=null){
promoPrice = new Double(sqlType.getPromoPrice().doubleValue() );
}else{
promoPrice=null;
Double wholeSalePrice;
if (sqlType.getWholeSalePrice()!=null){
wholeSalePrice = new Double(sqlType.getWholeSalePrice().doubleValue() );
}else{
wholeSalePrice=null;
currPrices.setCustomPrice( customPrice );
currPrices.setPromotionalPrice(promoPrice );
currPrices.setWholesalePrice(wholeSalePrice);
currPrices.setSku(sqlType.getSku());
currPrices.setPromoEndDate(sqlType.getPromoEndDate());
prodPrices[i] = currPrices;
}//end for
return prodPrices;
}catch (SQLException s) {
throw new JboException(s);
}//end catch
finally {
if (st != null) try { st.close(); } catch (SQLException s2) {}
}//end finally
* Helper method to get the current connection.
* As specified by
* re:BC4J: How get Connection from Application Module
* @return
private Connection getCurrentConnection() {
Statement st = null;
try {
st = getDBTransaction().createStatement(0);
return st.getConnection();
catch (SQLException s) {
s.printStackTrace();
return null;
finally {
if (st != null) try { st.close(); } catch (SQLException s2) {}

Avi, thanks for your response. The connection is obtained from a BC4J appmod, which ultimately comes from a pooled datasource.
When I look at the implementation class in the embeded OC4J environment it is com.evermind.sql.OracleConnectionBCELProxy__com_evermind_sql_OrionCMTConnection__SQLBCELProxy. The call to ARRAY works in this environment.
On the application server the runtime implementation of the connection is com.evermind.sql.ConnectionBCELProxy__com_evermind_sql_OrionCMTConnectionFinalize__SQLBCELProxy. This fails with the exception in the original post.
In both environments I can successfuly cast to an OracleConnection so I'm pretty sure both implementaion classes are subclasses of OracleConnection.
Both environments are 10.1.2.
thanks for your help so far.
jk

NullPointer

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