How to nullify the NullPointerException in my code. plz help Very Urgent!!

Question

hi,
I registered the crystl32.ocx properly and the previous errors were gone.
thank you for your suggestions.
and right now I have an error as shown below.
Exception in thread "main" java.lang.NullPointerException
at crystal.CrystalReport.aboutBox(CrystalReport.java:4466)
at javaapplication10.CrystalClient.main(CrystalClient.java:25)
Java Result: 1
BUILD SUCCESSFUL (total time: 1 second)
how to overcome this.

Answer 1

Thanks a lot mike.
I have attached some part of the source code here.
package crystal;
import com.linar.jintegra.*;
* COM Class 'CrystalReport'. Generated 11/10/2006 4:16:13 PM
* from 'C:\WINDOWS\system32\Crystl32.ocx'<P>
* Generated using com2java Version 2.6 Copyright (c) Intrinsyc Software International, Inc.
* See  <A HREF="http://j-integra.intrinsyc.com/">http://j-integra.intrinsyc.com/</A><P>
* Description '<B>Crystal Report Control</B>'
* Generator Options:
*   AwtForOcxs = True
*   PromptForTypeLibraries = False
*   RetryOnReject = False
*   IDispatchOnly = False
*   GenBeanInfo = False
*   LowerCaseMemberNames = True
*   TreatInStarAsIn = False
*   ArraysAsObjects = False
*   OmitRestrictedMethods = False
*   ClashPrefix = zz_
*   ImplementConflictingInterfaces = False
*   DontRenameSameMethods = False
*   RenameConflictingInterfaceMethods = False
*   ReuseMethods = False
* Command Line Only Options:
*   MakeClsidsPublic = False
*   DontOverwrite = False
public class CrystalReport extends com.linar.jintegra.Ocx implements com.linar.jintegra.RemoteObjRef, crystal.CrystalCtrl {
  private static final String CLSID = "00025601-0000-0000-c000-000000000046";
  protected String getJintegraVersion() { return "2.6"; }
  // Interface delegates
  private crystal.CrystalCtrlProxy d_CrystalCtrlProxy = null;
  /** Access this COM class's crystal.CrystalCtrl interface */
  public crystal.CrystalCtrl getAsCrystalCtrl() { return d_CrystalCtrlProxy; }
  /** Compare this object with another */
  public boolean equals(Object o) {
     if(java.beans.Beans.isDesignTime()) return super.equals(o);
     else return getJintegraDispatch() == null ? false : getJintegraDispatch().equals(o);
  /** J-Integra for COM internal method */
  public com.linar.jintegra.Dispatch getJintegraDispatch() {  return d_CrystalCtrlProxy; }
   * addCrystalReportEventsListener.  Listen to events generated by this class.
   * @param    theListener An object that implements the crystal.CrystalReportEvents interface.
   * @exception java.io.IOException If there are communications problems.
  public void addCrystalReportEventsListener(crystal.CrystalReportEvents theListener) throws java.io.IOException {
    if(d_CrystalCtrlProxy == null) {
      queuedListeners.addElement(new Object[] { "00025603-0000-0000-c000-000000000046", theListener });
    } else {
      d_CrystalCtrlProxy.addListener("00025603-0000-0000-c000-000000000046", theListener, this);
   * removeCrystalReportEventsListener.  Stop listening to events generated by this class.
   * @param    theListener An object that implements the crystal.CrystalReportEvents interface.
   * @exception java.io.IOException If there are communications problems.
  public void removeCrystalReportEventsListener(crystal.CrystalReportEvents theListener) throws java.io.IOException {
    d_CrystalCtrlProxy.removeListener("00025603-0000-0000-c000-000000000046", theListener);
   * Constructs a CrystalReport.
  public CrystalReport() {
    super(CLSID);
    try {
      if (super.getObjRef() == null) {
        return;
      d_CrystalCtrlProxy = new crystal.CrystalCtrlProxy(super.getObjRef());
    } catch(java.io.IOException ioe) {
      throw new RuntimeException("Unexpected: " + ioe);
   * Constructs a CrystalReport.
  public CrystalReport(Object o) {
    super(CLSID, o);
    try {
      if (super.getObjRef() == null) {
        return;
      d_CrystalCtrlProxy = new crystal.CrystalCtrlProxy(super.getObjRef());
    } catch(java.io.IOException ioe) {
      throw new RuntimeException("Unexpected: " + ioe);
  private java.util.Vector queuedListeners = new java.util.Vector();
  public void addNotify() {
    super.addNotify();
    try {
      if (super.getObjRef() == null) {
        return;
      if (d_CrystalCtrlProxy != null) {
        return;
      d_CrystalCtrlProxy = new crystal.CrystalCtrlProxy(super.getObjRef());
      zz_doQueuedSets("d_CrystalCtrlProxy", d_CrystalCtrlProxy);
      for(java.util.Enumeration e = queuedListeners.elements(); e.hasMoreElements(); ) {
        Object[] l = (Object[])e.nextElement();
        d_CrystalCtrlProxy.addListener(l[0] + "", l[1], this);
      queuedListeners.setSize(0);
    } catch(java.io.IOException ioe) {
      throw new RuntimeException("Unexpected: " + ioe);
   * Release a CrystalReport.
  public void release() {
    com.linar.jintegra.Cleaner.release(d_CrystalCtrlProxy);
   * getPropertyByName. Get the value of a property dynamically at run-time, based on its name
   * @return    The value of the property.
   * @param     name The name of the property to get.
   * @exception java.lang.NoSuchFieldException If the property does not exit.
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public Object getPropertyByName(String name) throws NoSuchFieldException, java.io.IOException, com.linar.jintegra.AutomationException {
    try {
      return d_CrystalCtrlProxy.getPropertyByName(name);
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
    } catch(NoSuchFieldException noSuchFieldException) {
      noSuchFieldException.fillInStackTrace();
      throw noSuchFieldException;
   * getPropertyByName. Get the value of a property dynamically at run-time, based on its name and a parameter
   * @return    The value of the property.
   * @param     name The name of the property to get.
   * @param     rhs A parameter used when getting the proxy.
   * @exception java.lang.NoSuchFieldException If the property does not exit.
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public Object getPropertyByName(String name, Object rhs) throws NoSuchFieldException, java.io.IOException, com.linar.jintegra.AutomationException {
    try {
      return d_CrystalCtrlProxy.getPropertyByName(name, rhs);
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
    } catch(NoSuchFieldException noSuchFieldException) {
      noSuchFieldException.fillInStackTrace();
      throw noSuchFieldException;
   * invokeMethodByName. Invoke a method dynamically at run-time
   * @return    The value returned by the method (null if none).
   * @param     name The name of the method to be invoked.
   * @param     parameters One element for each parameter. Use primitive type wrappers.
   *            to pass primitive types (eg Integer to pass an int).
   * @exception java.lang.NoSuchMethodException If the method does not exit.
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public Object invokeMethodByName(String name, Object[] parameters) throws NoSuchMethodException, java.io.IOException, com.linar.jintegra.AutomationException {
    return d_CrystalCtrlProxy.invokeMethodByName(name, parameters);
   * invokeMethodByName. Invoke a method dynamically at run-time
   * @return    The value returned by the method (null if none).
   * @param     name The name of the method to be invoked.
   * @exception java.lang.NoSuchMethodException If the method does not exit.
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public Object invokeMethodByName(String name) throws NoSuchMethodException, java.io.IOException, com.linar.jintegra.AutomationException {
    return d_CrystalCtrlProxy.invokeMethodByName(name, new Object[]{});
   * getReportFileName. The filename of the report to be printed
   * @return    The px
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public String getReportFileName  () throws java.io.IOException, com.linar.jintegra.AutomationException {
    if(d_CrystalCtrlProxy == null) {
      String[] retVal = new String[1];
      zz_get("ReportFileName", retVal);
      return retVal[0];
    try {
      return d_CrystalCtrlProxy.getReportFileName();
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
   * setReportFileName. The filename of the report to be printed
   * @param     px The px (in)
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public void setReportFileName  (
              String px) throws java.io.IOException, com.linar.jintegra.AutomationException {
    if(d_CrystalCtrlProxy == null) {
      zz_queueSet("d_CrystalCtrlProxy", "setReportFileName", (String)px);
      return;
    try {
      d_CrystalCtrlProxy.setReportFileName(px);
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
   * getWindowLeft. The coordinate of the left side of the print window, relative to its parent window
   * @return    The px
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public short getWindowLeft  () throws java.io.IOException, com.linar.jintegra.AutomationException {
    if(d_CrystalCtrlProxy == null) {
      short[] retVal = new short[1];
      zz_get("WindowLeft", retVal);
      return retVal[0];
    try {
      return d_CrystalCtrlProxy.getWindowLeft();
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
   * setWindowLeft. The coordinate of the left side of the print window, relative to its parent window
   * @param     px The px (in)
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public void setWindowLeft  (
              short px) throws java.io.IOException, com.linar.jintegra.AutomationException {
    if(d_CrystalCtrlProxy == null) {
      zz_queueSet("d_CrystalCtrlProxy", "setWindowLeft", (short)px);
      return;
    try {
      d_CrystalCtrlProxy.setWindowLeft(px);
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
   * getWindowTop. The coordinate of the top of the print window, relative to its parent window
   * @return    The px
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public short getWindowTop  () throws java.io.IOException, com.linar.jintegra.AutomationException {
    if(d_CrystalCtrlProxy == null) {
      short[] retVal = new short[1];
      zz_get("WindowTop", retVal);
      return retVal[0];
    try {
      return d_CrystalCtrlProxy.getWindowTop();
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
   * setWindowTop. The coordinate of the top of the print window, relative to its parent window
   * @param     px The px (in)
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public void setWindowTop  (
              short px) throws java.io.IOException, com.linar.jintegra.AutomationException {
    if(d_CrystalCtrlProxy == null) {
      zz_queueSet("d_CrystalCtrlProxy", "setWindowTop", (short)px);
      return;
    try {
      d_CrystalCtrlProxy.setWindowTop(px);
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
   * getWindowWidth. The width of the print window
   * @return    The px
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public short getWindowWidth  () throws java.io.IOException, com.linar.jintegra.AutomationException {
    if(d_CrystalCtrlProxy == null) {
      short[] retVal = new short[1];
      zz_get("WindowWidth", retVal);
      return retVal[0];
    try {
      return d_CrystalCtrlProxy.getWindowWidth();
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
   * setWindowWidth. The width of the print window
   * @param     px The px (in)
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public void setWindowWidth  (
              short px) throws java.io.IOException, com.linar.jintegra.AutomationException {
    if(d_CrystalCtrlProxy == null) {
      zz_queueSet("d_CrystalCtrlProxy", "setWindowWidth", (short)px);
      return;
    try {
      d_CrystalCtrlProxy.setWindowWidth(px);
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
   * getWindowHeight. The height of the print window
   * @return    The px
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public short getWindowHeight  () throws java.io.IOException, com.linar.jintegra.AutomationException {
    if(d_CrystalCtrlProxy == null) {
      short[] retVal = new short[1];
      zz_get("WindowHeight", retVal);
      return retVal[0];
    try {
      return d_CrystalCtrlProxy.getWindowHeight();
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
   * setWindowHeight. The height of the print window
   * @param     px The px (in)
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public void setWindowHeight  (
              short px) throws java.io.IOException, com.linar.jintegra.AutomationException {
    if(d_CrystalCtrlProxy == null) {
      zz_queueSet("d_CrystalCtrlProxy", "setWindowHeight", (short)px);
      return;
    try {
      d_CrystalCtrlProxy.setWindowHeight(px);
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
   * getWindowTitle. The title of the print window
   * @return    The px
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public String getWindowTitle  () throws java.io.IOException, com.linar.jintegra.AutomationException {
    if(d_CrystalCtrlProxy == null) {
      String[] retVal = new String[1];
      zz_get("WindowTitle", retVal);
      return retVal[0];
    try {
      return d_CrystalCtrlProxy.getWindowTitle();
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
   * setWindowTitle. The title of the print window
   * @param     px The px (in)
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public void setWindowTitle  (
              String px) throws java.io.IOException, com.linar.jintegra.AutomationException {
    if(d_CrystalCtrlProxy == null) {
      zz_queueSet("d_CrystalCtrlProxy", "setWindowTitle", (String)px);
      return;
    try {
      d_CrystalCtrlProxy.setWindowTitle(px);
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
   * isWindowControlBox. If set to TRUE, the print window will have a control box
   * @return    The px
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public boolean isWindowControlBox  () throws java.io.IOException, com.linar.jintegra.AutomationException {
    if(d_CrystalCtrlProxy == null) {
      boolean[] retVal = new boolean[1];
      zz_get("WindowControlBox", retVal);
      return retVal[0];
    try {
      return d_CrystalCtrlProxy.isWindowControlBox();
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
   * setWindowControlBox. If set to TRUE, the print window will have a control box
   * @param     px The px (in)
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public void setWindowControlBox  (
              boolean px) throws java.io.IOException, com.linar.jintegra.AutomationException {
    if(d_CrystalCtrlProxy == null) {
      zz_queueSet("d_CrystalCtrlProxy", "setWindowControlBox", (boolean)px);
      return;
    try {
      d_CrystalCtrlProxy.setWindowControlBox(px);
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
   * isWindowMaxButton. If set to TRUE, the print window will have a maximize button
   * @return    The px
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public boolean isWindowMaxButton  () throws java.io.IOException, com.linar.jintegra.AutomationException {
    if(d_CrystalCtrlProxy == null) {
      boolean[] retVal = new boolean[1];
      zz_get("WindowMaxButton", retVal);
      return retVal[0];
    try {
      return d_CrystalCtrlProxy.isWindowMaxButton();
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
   * setWindowMaxButton. If set to TRUE, the print window will have a maximize button
   * @param     px The px (in)
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public void setWindowMaxButton  (
              boolean px) throws java.io.IOException, com.linar.jintegra.AutomationException {
    if(d_CrystalCtrlProxy == null) {
      zz_queueSet("d_CrystalCtrlProxy", "setWindowMaxButton", (boolean)px);
      return;
    try {
      d_CrystalCtrlProxy.setWindowMaxButton(px);
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
   * isWindowMinButton. If set to TRUE, the print window will have a minimize button
   * @return    The px
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public boolean isWindowMinButton  () throws java.io.IOException, com.linar.jintegra.AutomationException {
    if(d_CrystalCtrlProxy == null) {
      boolean[] retVal = new boolean[1];
      zz_get("WindowMinButton", retVal);
      return retVal[0];
    try {
      return d_CrystalCtrlProxy.isWindowMinButton();
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
   * setWindowMinButton. If set to TRUE, the print window will have a minimize button
   * @param     px The px (in)
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public void setWindowMinButton  (
              boolean px) throws java.io.IOException, com.linar.jintegra.AutomationException {
    if(d_CrystalCtrlProxy == null) {
      zz_queueSet("d_CrystalCtrlProxy", "setWindowMinButton", (boolean)px);
      return;
    try {
      d_CrystalCtrlProxy.setWindowMinButton(px);
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
   * getPrintFileName. The filename for output when printing to file
   * @return    The px
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public String getPrintFileName  () throws java.io.IOException, com.linar.jintegra.AutomationException {
    if(d_CrystalCtrlProxy == null) {
      String[] retVal = new String[1];
      zz_get("PrintFileName", retVal);
      return retVal[0];
    try {
      return d_CrystalCtrlProxy.getPrintFileName();
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
   * setPrintFileName. The filename for output when printing to file
   * @param     px The px (in)
   * @exception java.io.IOException If there are communications problems.
   * @exception com.linar.jintegra.AutomationException If the remote server throws an exception.
  public void setPrintFileName  (
              String px) throws java.io.IOException, com.linar.jintegra.AutomationException {
    if(d_CrystalCtrlProxy == null) {
      zz_queueSet("d_CrystalCtrlProxy", "setPrintFileName", (String)px);
      return;
    try {
      d_CrystalCtrlProxy.setPrintFileName(px);
    } catch(com.linar.jintegra.AutomationException automationException) {
      automationException.fillInStackTrace();
      throw automationException;
  }