Nullpoint exception when population HtmlPanelGrid

Hello All.
I Have battled with this problem for two solid days now, I realy need you guys help on this one. The following code workes in another part of my program but on this part, I just can't get it right and end up with a nullpoint exception.
Here are some code:
test.jsp
<%@taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<%@taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<f:view>
<html>
<head>
<title>Test</title>
</head>
<body bgcolor="#ffffff">
<h:form id="testform">
<h:panelGrid id="listData" binding="#{TestBean.listData}" />
</h:form>
</body>
</html>
</f:view>
TestBean.class (modified to sute forum posting)
package beans.backingBeans;
import beans.BeanFactory;
//do relevant imports
public class TestBean {
private HtmlPanelGrid listData; //panelgrid that holds data
public CreateSurveyBean() {
populateData();
public HtmlPanelGrid getListData() {
return listData;
public void setListData(HtmlPanelGrid listData) {
this.listData = listData;
* fetch data to HtmlPanelGrid
* @param
* @return void
public void populateData() {
Application application = FacesContext.getCurrentInstance().getApplication(); //getApplication context
List children = getListData().getChildren(); //get children of component
children.clear(); //clear children
List dataSet = BeanFactory.geInstance().getData(); //get populationData from factoryBean
for(int i=0; i<questionSet.size(); i++) {
//irrelevant code that create som content for HtmlPanelGrid
children.add(item);
faces-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE faces-config PUBLIC "-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.1//EN" "http://java.sun.com/dtd/web-facesconfig_1_1.dtd">
<faces-config xmlns="http://java.sun.com/JSF/Configuration">
<managed-bean>
<description>SurveyBean</description>
<display-name>SurveyBean</display-name>
<managed-bean-name>SurveyBean</managed-bean-name>
<managed-bean-class>beans.backingBeans.SurveyBean</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>
</faces-config>
Nullpoint exception (from the webserver logfile)
java.lang.NullPointerException at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:206) at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:154) at com.sun.faces.application.ApplicationImpl.createComponent(ApplicationImpl.java:386) at javax.faces.webapp.UIComponentTag.createComponent(UIComponentTag.java:999) at javax.faces.webapp.UIComponentTag.createChild(UIComponentTag.java:1026) at javax.faces.webapp.UIComponentTag.findComponent(UIComponentTag.java:739) at javax.faces.webapp.UIComponentTag.doStartTag(UIComponentTag.java:429)
The exception seems to come from the row:
List children = getListData().getChildren(); //get children of component
in the testBean.class file. As I said before. This has worked in other parts of the program but now it doesn't. After some debugging runs I have found out that the getListData -method indead returns null, But I can't figure out why.

Well, Sometimes the question is more complex than the answer ;-)
Thanks for the help.
It still puzzels me that I don't have to instanciate the HtmlPanelGrid at the other jsf page in my app. It seems as it gets instanciated by some pagical means because I don't have a
HtmlPanelGrid data = new HtmlPanelGrid();
or
data = foo;
Anywhere.
The only thing that separates the two jsf pages from eachother is that in the case that workes, the page reloads several times before I present the HtmlPanelGrid. Can this be the answer somehow?
Well... Anyhwo. It workes!

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Nullpointer exception when calling Task.getPayloadAsElement()

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[2006/12/04 20:59:48]
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When I want to parse the payload to binding objects the method task.getPayloadAsElement returns a nullpointer exception. I'm using the Remote client variant of the API.
I hope some one can help me on this issue.
Thanks in advance!
-Tom

The task payload is not populated when fetching a list of tasks using the queryTasks() method. You need to explicitly call getTaskDetailsById() or getTaskDetailsByNumber() to retrieve the complete task with the payload. Then the method task.getPayloadAsElement() should return you the payload as expected.

Selfservice API fails :nullpointer exception when creating Trading Partners

When I am using the sample file and xsd that's supplied I get this error
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at oracle.tip.adapter.b2b.selfservice.TradingPartnerManager.processTPProfiles(TradingPartnerManager.java:297)
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... 2 more
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at oracle.xml.parser.v2.NonValidatingParser.parseDocument(NonValidatingParser.java:287)
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Hi Ramesh/Dheeraj,
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...Edited by: Lektroluv on May 5, 2009 8:37 AM
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================================================
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C:\Windows\system32>
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MxDispatcher version: 7.2.00.0 Built: 22.11.2010 18:36:12 (c) Copyright 2008 SAP
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Java VM: Sun Microsystems Inc.   Version: 1.5.0_12
Java home: C:\Java\jre1.5.0_12
Java lib/ext: C:\Java\jre1.5.0_12\lib\ext
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[11.12.2011 18:53:21-888] - MxDispatcher:Global constant MX_MAX_CONCURRENT_RUNTI
ME_ENGINES not found, using default = 9999
[11.12.2011 18:53:21-979] - run_java: "C:\Java\jre1.5.0_12\bin\java.exe" -cp "C
:\SAP\IdM\IC72\Java\DSE.jar;C:\SAP\IdM\IC72\Java;C:\SAP\IdM\IC72\Java\sapjco.jar
;C:\SAP\Oracle_OCI_10_2\ojdbc5.jar;C:\SAP\IdM\IC72\Java\mxdispatcher.jar;C;SAP\I
dM\IC72\Java\mxmcapi.jar;C:\SAP\IdM\IC72\Java\mxdispatcher.jar;C:\SAP\IdM\IC72\J
ava\mxmcapi.jar;C:\SAP\Oracle_OCI_10_2\ojdbc5.jar; " "-DDSE_HOME=C:\SAP\IdM\IC72
" com.sap.idm.ic.DSERunTime "Drivers=com.microsoft.jdbc.sqlserver.SQLServerDrive
r;com.microsoft.sqlserver.jdbc.SQLServerDriver;com.sap.dbtech.jdbc.DriverSapDB;o
rg.gjt.mm.mysql.Driver;sun.jdbc.odbc.JdbcOdbcDriver;oracle.jdbc.driver.OracleDri
ver;COM.ibm.db2.jdbc.app.DB2Driver;COM.ibm.db2.jcc.DB2Driver;COM.ibm.db2.jdbc.ne
t.DB2Driver;com.sap.db.jdbc.Driver;oracle.jdbc.driver.OracleDriver" "DatabaseURL
=jdbc:oracle:thin:mxmc_rt/****@localhost:1521:ORCL" Machine=idf_dispatcher Log
Level=4 StackTrace=2 loop
[11.12.2011 18:53:27-191] - run_java: "C:\Java\jre1.5.0_12\bin\java.exe" -cp "C
:\SAP\IdM\IC72\Java\DSE.jar;C:\SAP\IdM\IC72\Java;C:\SAP\IdM\IC72\Java\sapjco.jar
;C:\SAP\Oracle_OCI_10_2\ojdbc5.jar;C:\SAP\IdM\IC72\Java\mxdispatcher.jar;C;SAP\I
dM\IC72\Java\mxmcapi.jar;C:\SAP\IdM\IC72\Java\mxdispatcher.jar;C:\SAP\IdM\IC72\J
ava\mxmcapi.jar;C:\SAP\Oracle_OCI_10_2\ojdbc5.jar; " "-DDSE_HOME=C:\SAP\IdM\IC72
" com.sap.idm.ic.DSERunTime "Drivers=com.microsoft.jdbc.sqlserver.SQLServerDrive
r;com.microsoft.sqlserver.jdbc.SQLServerDriver;com.sap.dbtech.jdbc.DriverSapDB;o
rg.gjt.mm.mysql.Driver;sun.jdbc.odbc.JdbcOdbcDriver;oracle.jdbc.driver.OracleDri
ver;COM.ibm.db2.jdbc.app.DB2Driver;COM.ibm.db2.jcc.DB2Driver;COM.ibm.db2.jdbc.ne
t.DB2Driver;com.sap.db.jdbc.Driver;oracle.jdbc.driver.OracleDriver" "DatabaseURL
=jdbc:oracle:thin:mxmc_rt/****@localhost:1521:ORCL" Machine=idf_dispatcher Log
Level=4 StackTrace=2 loop

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.

How to catch exception when have max connection pool

hi,
i have define in oracle user that i could have max 10 sessions at the same time.
I have jdbc datasource & connection pool defined at glassfish server(JSF application).
now, if in application is too many queries to the database then i have error: nullpointer exception - becouse when i try to do:
con = Database.createConnection(); - it generates nullpointer exception becouse there isn't free connection pool
i try to catch exception like this:
public List getrep_dws_wnioski_wstrzymane_graph() {     int i = 0;     try {     con = Database.createConnection();     ps =    (Statement) con.createStatement();     rs = ps.executeQuery("select data, klasa, ile_dni_wstrzymana, ile_wnioskow from stg1230.dwsww_wstrzymane_dws8 order by data, klasa, ile_dni_wstrzymana, ile_wnioskow");     while(rs.next()){       rep_dws_wnioski_wstrzymane_graph.add(i,new get_rep_dws_wnioski_wstrzymane_graph(rs.getString(1),rs.getString(2),rs.getString(3),rs.getString(4)));       i++;     }     } catch (NamingException e) {         e.printStackTrace();     } catch (SQLException e) {         e.printStackTrace();     } catch (NullPointerException e) {         e.printStackTrace();         throw new NoConnectionException(); // catch null 1     } finally {     try {         con.close();     } catch (SQLException e) {         e.printStackTrace();     } catch (NullPointerException e) {         e.printStackTrace();         throw new NoConnectionException(); // catch null 2     }     } return rep_dws_wnioski_wstrzymane_graph; }
but at line:
con.close();
i have nullpointerexception
and
at line
throw new NoConnectionException(); // catch null 2
i have: caused by exception.NoConnectionException
what's wrong with my exception class? how to resolve it?
public class NoConnectionException extends RuntimeException{     public NoConnectionException(String msg, Throwable cause){       super(msg, cause);     }     public NoConnectionException(){       super();     } }
at web.xml i have defined:
<error-page>         <exception-type>exception.NoConnectionException</exception-type>         <location>/NoConnectionExceptionPage.jsp</location>     </error-page>

thanks,
i did it and i have error:
java.sql.SQLException: Error in allocating a connection. Cause: Connection could not be allocated because: ORA-02391: exceeded simultaneous SESSIONS_PER_USER limit
at com.sun.gjc.spi.base.DataSource.getConnection(DataSource.java:115)
at logic.Database.createConnection(Database.java:37): conn = ds.getConnection();
public class Database {
     public static Connection createConnection() throws NamingException,
                SQLException {
            Connection conn = null;
            try{
                Context ctx = new InitialContext();
          if (ctx == null) {
               throw new NamingException("No initial context");
          DataSource ds = (DataSource) ctx.lookup("jdbc/OracleReports");
          if (ds == null) {
               throw new NamingException("No data source");
          conn = ds.getConnection(); // here's exception when max connections to database
          if (conn == null) {
               throw new SQLException("No database connection");
            } catch (NamingException e) {
                e.printStackTrace();
                throw new NoConnectionException();
         } catch (SQLException e) {
             e.printStackTrace();
                throw new NoConnectionException();
            catch (NullPointerException e) {
             e.printStackTrace();
                throw new NoConnectionException(); // obsluga bledy na wypadek jesli braknie wolnych polaczen do bazy
        return conn;
}and at my ealier code i have error:
at logic.GetDataOracle.getrep_dws_wnioski_wstrzymane_graph(GetDataOracle.java:192)
at line: con = Database.createConnection();
in code:
public List getrep_dws_wnioski_wstrzymane_graph() {
    int i = 0;
    try {
    con = Database.createConnection();
    ps =    (Statement) con.createStatement();
    rs = ps.executeQuery("select data, klasa, ile_dni_wstrzymana, ile_wnioskow from stg1230.dwsww_wstrzymane_dws8 order by data, klasa, ile_dni_wstrzymana, ile_wnioskow");
    while(rs.next()){
      rep_dws_wnioski_wstrzymane_graph.add(i,new get_rep_dws_wnioski_wstrzymane_graph(rs.getString(1),rs.getString(2),rs.getString(3),rs.getString(4)));
      i++;
    } catch (NamingException e) {
        e.printStackTrace();
    } catch (SQLException e) {
        e.printStackTrace();
    } catch (NullPointerException e) {
        e.printStackTrace();
        throw new NoConnectionException();
    } finally {
    try {
        if(con != null)
        con.close();
    } catch (SQLException e) {
        e.printStackTrace();
    } catch (NullPointerException e) {
        e.printStackTrace();
        throw new NoConnectionException();
return rep_dws_wnioski_wstrzymane_graph;
}so what's wrong?
i have limit max sessions 10 at oracle so i set at my connection pool 5 connections as max. But when i get max 5 sesssins and try to execute next query then i can't catch exception..

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

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

Java.lang.NullPointer exception and operating systems

Do different operating systems handle the NullPointer exception differently? I have an application that has a screen come up when you click a button. However, the app attempts to process some data before bring up the screen. Sometimes the data is null. The application works fine on linux red hat. However, the screen does not come up on HP Unix. I am not looking to fix the code (even though it may need fixed), but I am looking for an explanation why app works differently in this regard.

Do different operating systems handle the NullPointer
exception differently? Nope.
My guess is that the different OSes have different threading models. In one case X amount of work gets done in the non-GUI thread before the GUI thread tries to do its thing. In the other OS, X+1 amount of work gets done, leading to different states for the GUIs to act on. This is almost certainly a bug in your app.

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

Nullpoint exception when population HtmlPanelGrid

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