NullPointerException by Servlets Calls

if I call a Servlet "http://www.myhost.ch:8080/testing/Hello", I receive the follwoing Errormessage:
Error: 500
Location: /testing/Hello
Internal Servlet Error:java.lang.NullPointerException at java.lang.ClassLoader.resolveClass(ClassLoader.java)
Hello is a Servlet in Subfolder /testing/WEB-INF/classes
Web.xml:
<servlet-name>Hello</servlet-name>
<servlet-class>com.msi.servlet.HelloWorld</servlet-class>
<servlet-mapping>
<servlet-name>Hello</servlet-name>
<url-pattern>/Hello</url-pattern>
</servlet-mapping>
The JSP-Site "http://www.myhost.ch/testing/test.jsp", works fine.
Can anyone help?

From my experince the resource does not receive the right parameter from the client (HTML) so if u tried to set a parameter inside your receiving server side resource ,it will throw a NullPointerException
for example:
String param=request.getParameter("parameter_in_HTML_form");
param will throw a NullPointerException if it does not get a clean value.
Could you check.
Also your web.xml file seems to be in good shape i wouldnt go there lokking for an error.
good luck

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Servlets calls another servlet

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the servlet which is situated in another machine
remoteservlet extends HttpServlet
doPost(...)
how do i call ?
few of the way i found by searching the forum.
but i would like to know the good way in my situation.

res.sendRedirect("LoginServlet?="+req.getRequestURI())
i tested this. it does not work.
my servlet wants to call another servlet which is
active on IP xxx.ddd.ffff.zzz in the LAN .
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res.sendRedirect("http://xxx.ddd.ffff.zzz:<portnumber>/<context_name>/<servlet_regd_name">);The request and response objects are generated anew for that Servlet. There's no two ways about it, IMO.
cheers,
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HTTP Servlet call

Hi all,
I have a BPM scenario where i have several conditional branches, and in one of the branch i have to make a HTTP Servlet call via HTTP adapter and pass some values from the incoming message in the HTTP post.
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Hi everyone,
I downloaded the wsdl file for the BAPI_USER_GETLIST.
I created a Deployable Proxy that points to this wsdl file.
I created a Web modul project with a servlet.
I also created an Enterprise application project that contains my Web modul project.
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<b>try {
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Hi David,
Before calling a BAPI, we have to make a connection to
R/3. Try following code...
import com.sap.mw.jco.*;
public class TutorialConnect1 extends Object {
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This code from sap help, for details visit this link..
http://help.sap.com/saphelp_erp2004/helpdata/en/bc/42e13d82fcfb34e10000000a114084/frameset.htm
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Regards,
Narinder Hartala

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Hi!!!
Im trying to deploy a servlet created in Jdeveloper on OC4J, but got the Error: java.lang.NullPointerException when the Jdeveloper is deploying the servlet.
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If you could give a little more info it would help. The web.xml for example, if your mapping it correctly, etc...

Java.lang.NullPointerException in Servlet

Hello Friends,
I am getting java.lang.NullPointerException line 28
I m enclosing the code
Please check and let me know asap
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.sql.*;
public class ForwardServlet extends HttpServlet
public void service(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException
try
response.setContentType("text/html");
PrintWriter out=response.getWriter();
String viewURL=response.encodeURL("/EmployeeTimesheetServlet"); String addURL=response.encodeURL("/Login.jsp");
String loginURL=response.encodeURL("/ProjectServlet");
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request.getRequestDispatcher(viewURL);
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request.getRequestDispatcher(addURL);
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rd.forward(request,response);---------------------->Line28
catch(Exception e)
e.printStackTrace();
i have checked all servlets
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RequestDispatcher rd=null;
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rd = request.getRequestDispatcher(viewURL);
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hi,
i am trying to create Gif by calling servlet in a JSP page.when the
same process done in Sun Java WebServer ,the gif is created with full
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able to recognise the colors.can anybody let me know what are
the settings to be changed.

Hey forum i fixed it by my own.
cheers

Problem with servlet call within servlet

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tia
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Have a look to HttpURLConnection object (in java.net package). A example of the code :
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byte[] buf = new byte[512];
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datain.close();
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Hi,
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Thanks in advance.

Hi,
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I call a servlet from a second window(thirdWin) that was created/opened by the first window(window) in HTML. The servlet writes out HTML to the browser using the following code(note HTML$ is a java class that contains methods of HTML code lines):
PrintWriter out=response.getWriter();
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out.println("thirdWin.document.write(\"<table><tr><td width=120>Search :</td><td width=300><input type='submit' name='showEdit' value='Show Profile'/></td></tr></table>\");");
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Since you want your function to write directly onto the page,
the only way would be to pass the "out" variable to your function
So your function would be
==============
public void pageFooter(JspWriter out, boolean bolEndBanner)
jspout.println( "<table width=\"100%\" align=\"center\" cellpadding=0 cellspacing=0 bgcolor=\"#FFFFFF\">" );
jspout.println( "<tr>" );
jspout.println( "</tr>" );
jspout.println( "</table>" );
// D�but de la Fin de page Normale
jspout.println( "</body>" );
jspout.println( "</head>" );
jspout.println( "</html>" );
==============

NullPointerException when mouselistener calls method

Good Evening,
I get a java.lang.NullPointerException when a mouselistener calls a method "populatethedatafields()" contained within the class. The populatethedatafields method tries to set the values of text fields and it is at this point the exception occurs. I have tried being more explict in identifying the fields using myclassname.this.textfieldname and this.textfieldname without success. When I moved the settext to within the mouselistener scope, I was able to make the changes.
Why does this occur?
I know that I can fix it by putting the settext into the listeners, but that does not seem to be good coding practice. Any suggestions for a good coding practice to solve this type of issue?
Many thanks for your time.
Some code removed for clarity and brevity.......
package EMSBeta1;
public class ContactInfoViewTEST2 extends JPanel {
private JTextField textFieldFirstName, textFieldLastName;
private JPanel custDetails;
/** Creates new ContactInfoView */
public ContactInfoViewTEST2(PowerSourceRacingModel model) {
mod = model;
cqm = mod.getContactQuery();
cdt = mod.getContactDetails();
initComponents();
public void initComponents() {
JPanel panel1 = new JPanel();
JPanel panel2 = new JPanel();
JPanel detailsPanel = new JPanel();
double size[][] =
{{10, -1.0, -1.0, -1.0, -1.0, TableLayout.PREFERRED, 10}, // Columns
{10, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 10}}; // Rows
panel1.setBorder(BorderFactory.createTitledBorder("This is a title"));
BoxLayout layout = new BoxLayout(panel1, BoxLayout.Y_AXIS);
panel1.setLayout(layout);
// panel2.setBorder(BorderFactory.createTitledBorder("This is a title"));
BoxLayout layout2 = new BoxLayout(panel2, BoxLayout.X_AXIS);
panel2.setLayout(layout2);
detailsPanel.setBorder(BorderFactory.createTitledBorder("This is a title"));
detailsPanel.setLayout(new TableLayout(size));
JLabel labelLastName = new JLabel("Last Name") ;
final JTextField textFieldLastName = new JTextField("Enter LastName",10);
JLabel labelFirstName = new JLabel("First Name") ;
final JTextField textFieldFirstName = new JTextField("FirstName",5);
textFieldLastName.setNextFocusableComponent(textFieldMembershipNum);
textFieldMembershipNum.setNextFocusableComponent(textFieldAddress);
textFieldAddress.setNextFocusableComponent(textFieldEmerContactPhone);
detailsPanel.add(labelLastName, "1, 1, L, C");
detailsPanel.add(textFieldLastName, "1, 2, L, T");
detailsPanel.add(labelFirstName, "3, 1, L, C");
detailsPanel.add(textFieldFirstName, "3, 2, L, T");
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this.setLayout(new BorderLayout());
add(panel1,BorderLayout.WEST);
add(panel2,BorderLayout.SOUTH);
add(detailsPanel,BorderLayout.CENTER);
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public void mouseClicked(MouseEvent e) {
public void mouseEntered(MouseEvent e) {
public void mouseExited(MouseEvent e) {
public void mousePressed(MouseEvent e) {
public void mouseReleased(MouseEvent e) {
createNewContact.setEnabled(true);
updateButton.setEnabled(true);
insertNewDataButton.setEnabled(false);
clearButton.setEnabled(false);
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int indexValue = theList.getSelectedIndex();
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int selectedKey = selectedItem.getKey();
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populateTheDataFields();
list.addKeyListener(listKeyListener);
list.addMouseListener(listMouseListener);
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textFieldFirstName.setText(null);
textFieldLastName.setText(null);
public void populateTheDataFields() {
String first = (String)contactInfo.get("FIRSTNAME");
String last = (String)contactInfo.get("LASTNAME");
this.textFieldFirstName.setText(first);
this.textFieldLastName.setText(last);
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Ah Ha, Discovered the solution/problem.
Note that I declared textFieldFirstName and textFieldLastName as class objects with private scope. Then in the initComponents METHOD, I created NEW textFieldFirstName and textFieldLastName objects whose scope is limited only to the method. By prefixing the objects with type, I was creating new instances of the objects rather than "re-using" the class objects. Class objects with appropriate scope are accessible by methods and inner classes. Objects created within a method are not unless the method returns the object.
Subtle, but basic OO stuff that was a painful lesson. Whew!

Nullpointerexception on webservice call with J2SE1.5

the following code:
        D2DServices service = new D2DServicesLocator();
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        this.logger.debug("conn: "+ D2D.testConnection());Stub classes are generated by WSDL2Java from axis. Webservice is .Net, I have it running on the same machine as the Java client. Should return a 'true'.
I can access the webservice from my browser, I can successfully call the method.
I'm sure the classes I use aren't Null.
Same exception occurs if I set an endpoint.
It DID work before, which is what frustrates me most.
I use J2SE1.5 (Well, not anymore! but I'd like to!). I did not get the same error with JDK1.4.2_04
Also the 'signed namespace.jar' problem does NOT occur with J2SE1.5
gives me the following exception (abbreviated, original is quite long and repetetive):
AxisFault
faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server.userException
faultSubcode:
faultString: java.lang.NullPointerException
faultActor:
faultNode:
faultDetail:
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     at java.util.Hashtable.put(Unknown Source)
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     at org.apache.axis.SOAPPart.getAsSOAPEnvelope(SOAPPart.java:538)
     at org.apache.axis.Message.getSOAPEnvelope(Message.java:376)
     at org.apache.axis.client.Call.invokeEngine(Call.java:2583)
     at org.apache.axis.client.Call.invoke(Call.java:2553)
     at org.apache.axis.client.Call.invoke(Call.java:2248)
     at org.apache.axis.client.Call.invoke(Call.java:2171)
     at org.apache.axis.client.Call.invoke(Call.java:1691)
     at org.tempuri.D2DServicesSoapStub.testConnection(D2DServicesSoapStub.java:2197)
     at com.response.xuware.container.D2DContainer.connectToD2D(D2DContainer.java:76)
....[CUT]....
java.lang.NullPointerException
     at org.apache.axis.AxisFault.makeFault(AxisFault.java:129)
     at org.apache.axis.client.Call.invoke(Call.java:2251)
     at org.apache.axis.client.Call.invoke(Call.java:2171)
     at org.apache.axis.client.Call.invoke(Call.java:1691)
     at org.tempuri.D2DServicesSoapStub.testConnection(D2DServicesSoapStub.java:2197)
....[CUT]....
Caused by: java.lang.NullPointerException
     at java.util.Hashtable.put(Unknown Source)
     at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.setProperty(Unknown Source)
     at org.apache.axis.encoding.DeserializationContextImpl.parse(DeserializationContextImpl.java:246)
     at org.apache.axis.SOAPPart.getAsSOAPEnvelope(SOAPPart.java:538)
     at org.apache.axis.Message.getSOAPEnvelope(Message.java:376)
     at org.apache.axis.client.Call.invokeEngine(Call.java:2583)
     at org.apache.axis.client.Call.invoke(Call.java:2553)
     at org.apache.axis.client.Call.invoke(Call.java:2248)
     ... 38 more
Who can tell me what I'm doing wrong?

I�ve tried:
JDK 1.4.1 with AXIS 1.1
JDK 1.4.2_06 with AXIS 1.1
JDK 1.4.2_06 with AXIS 1.2
And I�ve got the same error:
Exception in thread "main" AxisFault
faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server.userException
faultSubcode:
faultString: java.lang.NullPointerException
faultActor:
faultNode:
faultDetail:
{http://xml.apache.org/axis/}stackTrace: AxisFault
faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server.userException
faultSubcode:
faultString: java.lang.NullPointerException
faultActor:
faultNode:
faultDetail:
java.lang.NullPointerException
at org.apache.axis.message.SOAPFaultBuilder.createFault(SOAPFaultBuilder
.java:260)
at org.apache.axis.message.SOAPFaultBuilder.endElement(SOAPFaultBuilder.
java:169)
at org.apache.axis.encoding.DeserializationContextImpl.endElement(Deseri
alizationContextImpl.java:1015)
at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source
at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknow
n Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContent
Dispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Un
known Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(Unknown Source)
at org.apache.axis.encoding.DeserializationContextImpl.parse(Deserializa
tionContextImpl.java:242)
at org.apache.axis.SOAPPart.getAsSOAPEnvelope(SOAPPart.java:538)
at org.apache.axis.Message.getSOAPEnvelope(Message.java:376)
at org.apache.axis.client.Call.invokeEngine(Call.java:2583)
at org.apache.axis.client.Call.invoke(Call.java:2553)
at org.apache.axis.client.Call.invoke(Call.java:2248)
at org.apache.axis.client.Call.invoke(Call.java:2171)
at org.apache.axis.client.Call.invoke(Call.java:1691)
at testearray01.ws.Testearray01SoapBindingStub.getClientes(Testearray01S
oapBindingStub.java:142)
at TesteClient01.main(TesteClient01.java:11)
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A servlet calling another servlet on diff machine

plzzzz help me on how i will call a servlet which is running
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To call a servlet on a different machine you can use the HttpURLConnection class. Search the forum for details on how to do this.
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I've got a servlet wich calls a sqlj methode; the sqlj opens an iterator, converts it as a resultset, and sends it to the servlet.
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I don't know why, but sometimes, all data appears on the screen, and sometimes i get an error message "Exausted resultSet", and sometimes i get an other error message "Closed ResultSet".
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i use Tomkat 3.2.1 with apache
where does this bug come from ? Tomkat or SQLj ??
i've notice that the error appears when the garbage collector runs. If i run it manualy in the "while(rs.next())", it crashes immediately
if i run the garbage collector before the "while" statement, for small resulset, it never crashes, but for bigger resultset it do ! (as if the problem appears when the garbage collector runs)
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Are you using JDK 1.2.1? If yes, then try to use JDK 1.2.2 instead. We have seen JDK 1.2.1 garbage collecting things that are still in scope (very unsafe).
If wiggling your configuration does not help, you'll need to provide more info about your environment and it would be best to get a reproducible test case.
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hi
is there any way we can call a normal java function directly from a servlet? here's what i meant:
public void service(ServletRequest request, ServletResponse response)throws IOException{
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int javafunc(arg1,arg2){
do some processing here..
if anyone does get what i'm trying to do, how do I actually get them working? because i know the code above won't work..
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If you are asking whether you can call a Java method from a servlet, sure you can. Servlets are written in Java themselves. Of course you can't have a method inside a method, if that's the problem you are referring to. Just put your javafunc method outside your service method.
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NullPointerException by Servlets Calls

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