JDK 1.6 null object genetates null pointer Exception while passing to JNI

Hi All,
I 've a problem with passing null to JNI method getStringNative( JString name) it throws NullPointerException.
Instead of null, we pass String "null" its working fine .
But it this problem is not Occuring inJDK 1.4.
Can u please let me know ? why In JDK 1.6 this problem is Occuring, is there any differ in jdk 1.6 null obj passing to JNI method.
Thanks & Regards
Prakash

I 've a problem with passing null to JNI method getStringNative( JString name) it throws NullPointerException.There is no such method in the JNI 1.6 Specification.
Instead of null, we pass String "null" its working fine .Of course. "null" is a String, not a null pointer. Just like "not-null" is a String. Or "Prakash". They are all Strings.
But it this problem is not Occuring inJDK 1.4.
Can u please let me know ? why In JDK 1.6 this problem is Occuring, is there any differ in jdk 1.6 null obj passing to JNI method.It's not a JNI method.
Whatever it is, its specification will tell you whether or not it supports a null parameter.

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Contact [email protected]
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hi Keerthi,
thank you.
i tried with below code but still unsuccesfully
+ oaDFF = (OADescriptiveFlexBean)oawebbean.findIndexedChildRecursive("ActFlexField");+
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i am able to print 1° comment line but not second. so i think it's something wrong getting the segment handle.
anyway i'm not able to reach your suggested if statement because execution stops before.
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any suggestion appreciated,
thanx,
N

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firstly the first main . Is this a typo
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oapagecontext.writeDiagnostics(this, "Niccal: before if", 1);it's urgent
any help appreciated
thanx
N

hi Keerthi,
thank you.
i tried with below code but still unsuccesfully
+ oaDFF = (OADescriptiveFlexBean)oawebbean.findIndexedChildRecursive("ActFlexField");+
oapagecontext.writeDiagnostics(this, "Niccal: i got DFF handle", 1);
OAMessageTextInputBean mtib = (OAMessageTextInputBean)oaDFF.findChildRecursive("ActFlexField0");
oapagecontext.writeDiagnostics(this, "Niccal: before if", 1);
i am able to print 1° comment line but not second. so i think it's something wrong getting the segment handle.
anyway i'm not able to reach your suggested if statement because execution stops before.
Infact, if i comment line :OAMessageTextInputBean mtib = (OAMessageTextInputBean)oaDFF.findChildRecursive("ActFlexField0");
page doesn't give error and saves data.
any suggestion appreciated,
thanx,
N

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 at org.apache.beehive.netui.pageflow.PageFlowRequestProcessor$ActionRunner.execute(PageFlowRequestProcessor.java:2044)
 at org.apache.beehive.netui.pageflow.interceptor.action.internal.ActionInterceptors.wrapAction(ActionInterceptors.java:91)
 at org.apache.beehive.netui.pageflow.PageFlowRequestProcessor.processActionPerform(PageFlowRequestProcessor.java:2116)
 at com.bea.console.internal.ConsolePageFlowRequestProcessor.processActionPerform(ConsolePageFlowRequestProcessor.java:261)
 at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
 at org.apache.beehive.netui.pageflow.PageFlowRequestProcessor.processInternal(PageFlowRequestProcessor.java:556)
 at org.apache.beehive.netui.pageflow.PageFlowRequestProcessor.process(PageFlowRequestProcessor.java:853)
 at org.apache.beehive.netui.pageflow.AutoRegisterActionServlet.process(AutoRegisterActionServlet.java:631)
 at org.apache.beehive.netui.pageflow.PageFlowActionServlet.process(PageFlowActionServlet.java:158)
 at com.bea.console.internal.ConsoleActionServlet.process(ConsoleActionServlet.java:256)
 at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
 at com.bea.console.internal.ConsoleActionServlet.doGet(ConsoleActionServlet.java:133)
 at org.apache.beehive.netui.pageflow.PageFlowUtils.strutsLookup(PageFlowUtils.java:1199)
 at com.bea.portlet.adapter.scopedcontent.ScopedContentCommonSupport.executeAction(ScopedContentCommonSupport.java:686)
 at com.bea.portlet.adapter.scopedcontent.ScopedContentCommonSupport.renderInternal(ScopedContentCommonSupport.java:266)
 at com.bea.portlet.adapter.scopedcontent.StrutsStubImpl.render(StrutsStubImpl.java:107)
 at com.bea.netuix.servlets.controls.content.NetuiContent.preRender(NetuiContent.java:292)
 at com.bea.netuix.nf.ControlLifecycle$6.visit(ControlLifecycle.java:428)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:727)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walkRecursivePreRender(ControlTreeWalker.java:739)
 at com.bea.netuix.nf.ControlTreeWalker.walk(ControlTreeWalker.java:146)
 at com.bea.netuix.nf.Lifecycle.processLifecycles(Lifecycle.java:395)
 at com.bea.netuix.nf.Lifecycle.processLifecycles(Lifecycle.java:361)
 at com.bea.netuix.nf.Lifecycle.runOutbound(Lifecycle.java:208)
 at com.bea.netuix.nf.Lifecycle.run(Lifecycle.java:162)
 at com.bea.netuix.servlets.manager.UIServlet.runLifecycle(UIServlet.java:388)
 at com.bea.netuix.servlets.manager.UIServlet.doPost(UIServlet.java:258)
 at com.bea.netuix.servlets.manager.UIServlet.doGet(UIServlet.java:211)
 at com.bea.netuix.servlets.manager.UIServlet.service(UIServlet.java:196)
 at com.bea.netuix.servlets.manager.SingleFileServlet.service(SingleFileServlet.java:251)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
 at com.bea.console.utils.MBeanUtilsInitSingleFileServlet.service(MBeanUtilsInitSingleFileServlet.java:47)
 at weblogic.servlet.AsyncInitServlet.service(AsyncInitServlet.java:130)
 at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
 at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
 at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
 at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
 at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
 at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.doIt(WebAppServletContext.java:3684)
 at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3650)
 at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
 at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
 at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2268)
 at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2174)
 at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1446)
 at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
 at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)

I've got the same issue too.
My setup is to have one domain acting as both Source and Destination.
For every 10 seconds, I'm seeing 4 of these logs, and the CPU consumption is 100% consistently.
####<2-Jun-2009 11:00:27 o'clock AM EDT> <Debug> <SecuritySAMLCredMap> <MYHOST> <AdminServer> <[ACTIVE] ExecuteThread: '18' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1243954827839> <BEA-000000> <SAMLCredentialMapperV2: getCredentials: Subject initiator>
####<2-Jun-2009 11:00:27 o'clock AM EDT> <Debug> <SecuritySAMLCredMap> <MYHOST> <AdminServer> <[ACTIVE] ExecuteThread: '18' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1243954827839> <BEA-000000> <SAMLCredentialMapperV2: getCredentials(Subject): getCredentialInternal() called>
####<2-Jun-2009 11:00:27 o'clock AM EDT> <Debug> <SecuritySAMLCredMap> <MYHOST> <AdminServer> <[ACTIVE] ExecuteThread: '18' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1243954827839> <BEA-000000> <SAMLCredentialMapperV2: getCredentialInternal(): SAML Credential Mapper does not support credential type: weblogic.UserPassword, returns null>
Does anyone know what's happening? I've got one of the Security Provider = Active Directory, and thus there's no password returning. Could it be the root cause of the problem?

Null Pointer Exception while Retrieving Records using Java API

Hi,
I am using the Class RetrieveLimitedRecords, to retrieve he records from the main table.
While using this class I am getting an error Null Pointer Exception, when there are no records matching the search criteriea.
Could anybody tell me how to ignore this error.
Thanks,
Priya.

Hi,
Thanks for the reply.
There is no any class which automatically handles, so we should handle exceptions individually.
Thanks,
Priya.

Exception while passing null as param in custom tag

Hi,
I am using Oracle 10g AS(10.1.2). In my j2ee application,while passing NULL as parameter in custom tags, i am getting exception. But it was working fine with oracle 9i as.
for example:
This is my code in jsp:
<%
String str =null;
%>
<test:getInfo id="<%=str%>" />
While executing the above code, I am getting the following exception :
javax.servlet.ServletException
at com.evermind.server.http.EvermindPageContext.handlePageThrowable(EvermindPageContext.java:595)
at com.evermind.server.http.EvermindPageContext.handlePageException(EvermindPageContext.java:537)
at ListAlerts.jspService(_ListAlerts.java:1827)
at com.orionserver.http.OrionHttpJspPage.service(OrionHttpJspPage.java:56)
at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:350)
at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:509)
at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:413)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:824)
at com.evermind.server.http.ServletRequestDispatcher.include(ServletRequestDispatcher.java:121)
at com.evermind.server.http.GetParametersRequestDispatcher.newInclude(GetParametersRequestDispatcher.java:80)
at com.evermind.server.http.GetParametersRequestDispatcher.include(GetParametersRequestDispatcher.java:34)
at com.evermind.server.http.EvermindPageContext.include(EvermindPageContext.java:267)
at Content.jspService(_Content.java:181)
at com.orionserver.http.OrionHttpJspPage.service(OrionHttpJspPage.java:56)
at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:350)
at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:509)
at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:413)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:824)
at com.evermind.server.http.ServletRequestDispatcher.include(ServletRequestDispatcher.java:121)
at com.evermind.server.http.GetParametersRequestDispatcher.newInclude(GetParametersRequestDispatcher.java:80)
at com.evermind.server.http.GetParametersRequestDispatcher.include(GetParametersRequestDispatcher.java:34)
at com.evermind.server.http.EvermindPageContext.include(EvermindPageContext.java:267)
at Main.jspService(_Main.java:360)
at com.orionserver.http.OrionHttpJspPage.service(OrionHttpJspPage.java:56)
at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:350)
at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:509)
at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:413)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:824)
at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:330)
at com.evermind.server.http.ServletRequestDispatcher.forward(ServletRequestDispatcher.java:222)
at org.apache.struts.action.ActionServlet.processActionForward(ActionServlet.java:845)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:734)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:98)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:824)
at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:330)
at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:830)
at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:224)
at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:133)
at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192)
at java.lang.Thread.run(Thread.java:534)
Please help me....

Hello,
I do not remember exactly how the null where handle in Oracle 9iAS. Have you tested what is the differences in the way the <%= null %> is returned in both 9iAS and 10.1.2?
You may just have to modify the way the value is sent to the bean from the tag.
Regards
Tugdual Grall

Javanull pointer exception while trying to plot a point, help pls :(

Hi, i'm trying to plot mandelbrot's set, but i'm having problem with java logic, or something, i'm using netbeans, i have all the functions needed to calculate if a point belongs to mandelbrot or not, but when it comes to displaying a point, i get a null pointer exception, at the line that is supposed to plot it, here is my code:
* juliabrot.java
* Created on 14 de julio de 2010, 11:42 PM
package Fractales;
import java.awt.Color;
import java.awt.Graphics;
* @author Omar
public class juliabrot extends javax.swing.JPanel {
 private float tamX=370;
 private float tamY=270;
 public Graphics g;
 /** Creates new form juliabrot */
 public juliabrot() {
 initComponents();
 Complejos C=new Complejos(0.0,0.0);
 calcular(-2.0f,-1.25f,0.5f,1.25f,C);
 //repaint();
 /** This method is called from within the constructor to
 * initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is
 * always regenerated by the Form Editor.
 // <editor-fold defaultstate="collapsed" desc="Generated Code">
 private void initComponents() {
 canvas1 = new java.awt.Canvas();
 canvas1.setBackground(new java.awt.Color(255, 255, 255));
 javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
 this.setLayout(layout);
 layout.setHorizontalGroup(
 layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
 .addGroup(layout.createSequentialGroup()
 .addContainerGap()
 .addComponent(canvas1, javax.swing.GroupLayout.DEFAULT_SIZE, 380, Short.MAX_VALUE)
 .addContainerGap())
 layout.setVerticalGroup(
 layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
 .addGroup(layout.createSequentialGroup()
 .addContainerGap()
 .addComponent(canvas1, javax.swing.GroupLayout.DEFAULT_SIZE, 280, Short.MAX_VALUE)
 .addContainerGap())
 }// </editor-fold>
 // Variables declaration - do not modify
 private java.awt.Canvas canvas1;
 // End of variables declaration
 public int julia(Complejos z,Complejos x,int max){
 Complejos w=new Complejos();
 int k=0;
 w=z;
 double h=w.modulo(w);
 while(h<=2 && k<=max){
 w=w.cuadradoC(w);
 w=w.sumacomplejos(w, x);
 h=w.modulo(w);
 k++;
 return k;
public int Mandelbrot(Complejos z,int max){
 Complejos w=new Complejos();
 double h;
 int k=0;
 w=z;
 h=w.modulo(w);
 while(h<= 4.0 && k<max){
 w=w.cuadradoC(w);
 w=w.sumacomplejos(w, z);
 h=w.modulo(w);
 k++;
 return k;
 public void calcular(float xmin, float ymin, float xmax, float ymax, Complejos c) {
 //g=canvas1.getGraphics();
 int i=0;int j=0;
 int color;
 Complejos z = new Complejos();
 float px, py, dx, dy;
 px = xmin;
 py = ymin;
 dx = (xmax - xmin) / tamX;
 dy = (ymax - ymin) / tamY;
 while(i<=tamX){
 while(j<=tamY){
 z.x=px;
 z.y=py;
 //color=julia(z,c,250);
 color=Mandelbrot(z,250);
 dibujar(g,i,j,color);
 j++;
 py = py + dy;
 z.y=z.y+dy;
 px = px + dx;
 //z.x=z.x+dx;
 py = ymin;
 j=0;
 i++;
 public void dibujar(Graphics g, int i, int j, int color) {
 int maxiter = 250;
 //System.out.println(i + "D" + j);
 if (color >= maxiter) {
 g.setColor(Color.BLACK);
 g.fillOval(i, j, 1, 1);
 } else if (color > maxiter / 8) {
 g.setColor(Color.ORANGE);
 g.fillOval(i, j, 1, 1);
 } else if (color > maxiter / 10) {
 g.setColor(Color.RED);
 g.fillOval(i, j, 1, 1);
 } else if (color > maxiter / 20) {
 g.setColor(Color.BLUE);
 g.fillOval(i, j, 1, 1);
 } else if (color > maxiter / 40) {
 g.setColor(Color.YELLOW);
 g.fillOval(i, j, 1, 1);
 } else if (color > maxiter / 100) {
 g.setColor(Color.GREEN);
 g.fillOval(i, j, 1, 1);
 } else {
 //System.out.println(i+"D"+j);
 g.setColor(Color.CYAN); //i get the null pointer here, or in any other that belongs to mandelbrot set
 g.fillOval(i, j, 1, 1);
 /*@Override
 public void paint (Graphics G){
 Complejos C=new Complejos(0.0,0.0);
 calcular(-2.0f,-1.25f,0.5f,1.25f,C);
}I'm using netbeans, to execute it i just add it to a jframe, i don't know what i'm doing wrong, some help would be appreciated.
Thanks in advance

DarrylBurke wrote:
Recommended reading: [The Java Tutorials|http://download.oracle.com/docs/cd/E17409_01/javase/tutorial/]
Code comments:
-- Inconsistent use of horizontal and vertical whitespace, makes the code very difficult to read
-- Variable declarations interspersed with executable code
-- Mixing heavy and lightweight components (JPanel and Canvas)
-- Incorrect approach to custom painting
-- Invoking a method with an uninitialized class field as a parameter
Seriously, learn some basics before trying to copy code from here and there, throwing it at the wall and hoping it'll stick.
dbWell, the whitespace are handled by netbeans, didn't copied the code, but most codes that you'll find to make julia and mandelbrot sets will be very similar, there are craploads of fully working java codes for this , if had copied it would work, as for the rest, yes, i'm not a java expert, that's why i'm asking for help here, if i had enough time to become an expert, i wouldn't be asking for help here.
As for the stack trace, i'm getting this:
java.lang.NullPointerException
at Fractales.juliabrot.dibujar(juliabrot.java:145)
at Fractales.juliabrot.calcular(juliabrot.java:109)
at Fractales.juliabrot.<init>(juliabrot.java:25)
at Fractales.Visualizacion.init(Visualizacion.java:25)
at sun.applet.AppletPanel.run(AppletPanel.java:425)
at java.lang.Thread.run(Thread.java:619)
As i've said, Vizalizacion just creates a new panel, and adds it.
Edited by: omar.nus on Jul 15, 2010 12:20 PM

Null Pointer Exception while pointing to a custom BAPI.

Hello ,
I am on EP7.0 ERP05 NW04s and trying to modify the ESS Address application by pointing to a custom Function Module rather than the standard one , and getting a message like "Attempt to send a message to a non-object value".
and it was working fine for the standard one.
Is it because the custom BAPI is returning a null structure value .....?
Any help would be highly appreciated.

Hi ,
Did ur problem got resolved . I am also facing the same problem.
Please do help also.

JDK 1.6 null object genetates null pointer Exception while passing to JNI

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