Using Back button causes Null Pointer exception

Hi,
I have done some customization by extending the seeded Controller on a Page.I have altered the View query and executed it again dynamically as its not a static query.
There is a functionality called compare which directs the users to a page from the page I have customised the controller.
If the user uses the back button to return to the previous page it is giving a Null Pointer exception.
Also refresh button causes a similar Null Pointer exception on the customised controller page.
can anybody throw some light?
Also is there a way to disable the back and refresh button on the page?

Is the control entering the back button code in process request in your CO? Have you confirmed this by putting some debug comments?It many be that this error might being from the code where you have handled back button.
Put debugging comments and check.
--Mukul

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 at oracle.jbo.uicli.binding.JUCtrlHierBinding.bringNodeToRangeKeyPath(JUCtrlHierBinding.java:788)
 at oracle.adfinternal.view.faces.model.binding.FacesCtrlHierBinding.bringNodeToRangeKeyPath(FacesCtrlHierBinding.java:111)
 at oracle.adfinternal.view.faces.model.binding.RowDataManager.setRowKey(RowDataManager.java:130)
 at oracle.adfinternal.view.faces.model.binding.FacesCtrlHierBinding$FacesModel.setRowKey(FacesCtrlHierBinding.java:830)
 at org.apache.myfaces.trinidad.component.UIXCollection.setRowKey(UIXCollection.java:513)
 at oracle.adfinternal.view.faces.renderkit.rich.TreeRendererUtils._isMultiRootedTree(TreeRendererUtils.java:2507)
 at oracle.adfinternal.view.faces.renderkit.rich.TreeRendererUtils.addClientPropertyFlags(TreeRendererUtils.java:1915)
 at oracle.adfinternal.view.faces.renderkit.rich.TreeRenderer.addClientProperties(TreeRenderer.java:742)
 at oracle.adfinternal.view.faces.renderkit.rich.TreeRenderer.encodeAll(TreeRenderer.java:351)
 at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
 at org.apache.myfaces.trinidad.component.UIXCollection.encodeEnd(UIXCollection.java:617)
 at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
 at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeAllChildren(CoreRenderer.java:641)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelBoxRenderer._encodeAllChildren(PanelBoxRenderer.java:1518)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelBoxRenderer._renderContentRow(PanelBoxRenderer.java:1440)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelBoxRenderer.encodeAll(PanelBoxRenderer.java:381)
 at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
 at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
 at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer._encodeChild(PanelGroupLayoutRenderer.java:447)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer.access$1500(PanelGroupLayoutRenderer.java:30)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer$EncoderCallback.processComponent(PanelGroupLayoutRenderer.java:734)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer$EncoderCallback.processComponent(PanelGroupLayoutRenderer.java:637)
 at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:187)
 at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:318)
 at org.apache.myfaces.trinidad.component.UIXComponent.encodeFlattenedChildren(UIXComponent.java:283)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer.encodeAll(PanelGroupLayoutRenderer.java:360)
 at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
 at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
 at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
 at oracle.adfinternal.view.faces.renderkit.rich.ShowDetailItemRenderer.access$600(ShowDetailItemRenderer.java:37)
 at oracle.adfinternal.view.faces.renderkit.rich.ShowDetailItemRenderer$ChildEncoderCallback.processComponent(ShowDetailItemRenderer.java:640)
 at oracle.adfinternal.view.faces.renderkit.rich.ShowDetailItemRenderer$ChildEncoderCallback.processComponent(ShowDetailItemRenderer.java:613)
 at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:187)
 at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:318)
 at org.apache.myfaces.trinidad.component.UIXComponent.encodeFlattenedChildren(UIXComponent.java:283)
 at oracle.adfinternal.view.faces.renderkit.rich.ShowDetailItemRenderer._encodeChildren(ShowDetailItemRenderer.java:550)
 at oracle.adfinternal.view.faces.renderkit.rich.ShowDetailItemRenderer.encodeAll(ShowDetailItemRenderer.java:121)
 at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
 at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
 at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
 at oracle.adf.view.rich.render.RichRenderer.encodeStretchedChild(RichRenderer.java:2194)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelAccordionRenderer._encodeNonScreenReaderDetailItem(PanelAccordionRenderer.java:1572)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelAccordionRenderer._encodeDetailItem(PanelAccordionRenderer.java:1638)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelAccordionRenderer.access$4900(PanelAccordionRenderer.java:58)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelAccordionRenderer$PanelEncoderCallback.processComponent(PanelAccordionRenderer.java:2775)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelAccordionRenderer$PanelEncoderCallback.processComponent(PanelAccordionRenderer.java:2719)
 at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:187)
 at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:318)
 at org.apache.myfaces.trinidad.component.UIXComponent.encodeFlattenedChildren(UIXComponent.java:283)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelAccordionRenderer.encodeAll(PanelAccordionRenderer.java:471)
 at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
 at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
 at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer.encodeStartFacet(PanelStretchLayoutRenderer.java:942)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer._encodeVerticalPane(PanelStretchLayoutRenderer.java:1542)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer._encodeMiddlePanes(PanelStretchLayoutRenderer.java:350)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer.encodeAll(PanelStretchLayoutRenderer.java:316)
 at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
 at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
 at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
 at oracle.adf.view.rich.render.RichRenderer.encodeStretchedChild(RichRenderer.java:2194)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelSplitterRenderer._renderPane(PanelSplitterRenderer.java:1593)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelSplitterRenderer.encodeAll(PanelSplitterRenderer.java:263)
 at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
 at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
 at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer.encodeCenterFacet(PanelStretchLayoutRenderer.java:879)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer._encodeCenterPane(PanelStretchLayoutRenderer.java:1294)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer._encodeMiddlePanes(PanelStretchLayoutRenderer.java:351)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer.encodeAll(PanelStretchLayoutRenderer.java:316)
 at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
 at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
 at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
 at oracle.adf.view.rich.render.RichRenderer.encodeStretchedChild(RichRenderer.java:2194)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelSplitterRenderer._renderPane(PanelSplitterRenderer.java:1593)
 at oracle.adfinternal.view.faces.renderkit.rich.PanelSplitterRenderer.encodeAll(PanelSplitterRenderer.java:263)
 at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
 at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
 at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeAllChildren(CoreRenderer.java:641)
 at oracle.adf.view.rich.render.RichRenderer.encodeAllChildrenInContext(RichRenderer.java:3062)
 at oracle.adfinternal.view.faces.renderkit.rich.PageTemplateRenderer.encodeAll(PageTemplateRenderer.java:68)
 at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
 at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
 at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeAllChildren(CoreRenderer.java:641)
 at oracle.adf.view.rich.render.RichRenderer.encodeAllChildrenInContext(RichRenderer.java:3062)
 at oracle.adfinternal.view.faces.renderkit.rich.FormRenderer.encodeAll(FormRenderer.java:274)
 at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
 at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
 at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeAllChildren(CoreRenderer.java:641)
 at oracle.adf.view.rich.render.RichRenderer.encodeAllChildrenInContext(RichRenderer.java:3062)
 at oracle.adfinternal.view.faces.renderkit.rich.DocumentRenderer.encodeAll(DocumentRenderer.java:1277)
 at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
 at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
 at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
 at oracle.adfinternal.view.faces.context.PartialViewContextImpl._processRender(PartialViewContextImpl.java:321)
 at oracle.adfinternal.view.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:152)
 at javax.faces.component.UIViewRoot.encodeChildren(UIViewRoot.java:974)
 at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1652)
 at oracle.adfinternal.view.faces.component.AdfViewRoot.encodeAll(AdfViewRoot.java:91)
 at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:399)
 at org.apache.myfaces.trinidadinternal.application.ViewDeclarationLanguageFactoryImpl$ChangeApplyingVDLWrapper.renderView(ViewDeclarationLanguageFactoryImpl.java:350)
 at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
 at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:273)
 at org.apache.myfaces.trinidadinternal.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:165)
 at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._renderResponse(LifecycleImpl.java:1027)
 at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:334)
 at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:232)
 at javax.faces.webapp.FacesServlet.service(FacesServlet.java:313)
 at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
 at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
 at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
 at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
 at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:173)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
 at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:122)
 at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:468)
 at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)
 at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:468)
 at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:293)
 at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:199)
 at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
 at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:111)
 at java.security.AccessController.doPrivileged(Native Method)
 at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)
 at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:413)
 at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:94)
 at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:161)
 at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
 at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:136)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
 at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
 at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)
 at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)
 at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
 at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
 at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)
 at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)
 at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
 at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
 at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)
<LifecycleImpl> <_handleException> ADF_FACES-60098:Faces lifecycle receives unhandled exceptions in phase RENDER_RESPONSE 6
java.lang.NullPointerException
etc...Thanks.

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.

Null pointer exception using ImageIO

Hi all I'm not sure this belongs here or in the applet forum, but if don't belong here I'll move it. Anyway My question is this, I am trying to load an image into an applet before I was just doing this
public static Image getImage(String filename){
 if (applet == null)
 return null; // for now
 else
 return applet.getImage(applet.getDocumentBase(), filename);
 }Since then I've discovered ImageIO and have switched to this
public static BufferedImage getImage(String filename){
 BufferedImage img = null;
 //File image = new File(filename);
 try{
 //img = ImageIO.read(applet.getDocumentBase().getClass().getResource(filename));
 //img = ImageIO.read(image);
 img = ImageIO.read(ImageHandler.getFile(filename));
 }catch(IOException e){
 e.printStackTrace();
 return null;
 return img;Now my problem is that this is giving me a null pointer exception, each of the 3 times I try to load up the img variable I get a NPE and I cannot figure out why. I know the file is where its supposed to be and I know it is not corrupt since it works with the other code. So my question is why am I getting an exception with the second piece of code? Any advice or suggestions are appreciated thanks in advance.

Well that was part of the problem, thanks for that I didn't catch that at first, but now it just created a new exception in that I'm getting a illegal argument exception saying that the input == null. Here is the entire class I should have posted it in the first place sorry
import java.applet.Applet;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import javax.imageio.ImageIO;
public class ImageHandler {
 static Applet applet = null;
 public static void setApplet(Applet applet){
 ImageHandler.applet = applet;
 public static BufferedImage getImage(String filename){
 BufferedImage img = null;
 if(applet == null){
 System.out.println("Applet is null");//for testing
 return null; //for now
 }else{
 try{
 img = ImageIO.read(applet.getDocumentBase().getClass().getResource(filename));
 }catch(IOException e){
 e.printStackTrace();
 return null;
 return img;
}The applet gets set in another class here:
ImageHandler.setApplet(this);so unless I'm missing something (obviously I am or I won't be here lol) the applet is not null here is the errors I get again thanks for the help you've already given anymore is appreciated.
java.lang.IllegalArgumentException: input == null!
 at javax.imageio.ImageIO.read(Unknown Source)
 at ImageHandler.getImage(ImageHandler.java:27)
 at BackgroundImages.<init>(BackgroundImages.java:17)
 at BackGrounds.<init>(BackGrounds.java:17)
 at MainGame.init(MainGame.java:51)
 at sun.applet.AppletPanel.run(Unknown Source)
 at java.lang.Thread.run(Unknown Source)

Using Back button causes Null Pointer exception

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