Thanks Chuck, you made my day.
Cheers
---markus---
On 25.03.2011, at 18:47, Chuck Hill wrote:
> Hi Markus,
>
>
> On Mar 25, 2011, at 3:41 AM, Markus Ruggiero wrote:
>
>> I have an EO that has business logic for creating an PDF file. There is a
>> WOComponent that generates an XML which is then fed to ApacheFOP. Following
>> code is in the EO:
>>
>> GeneratedDocument.java
>>
>> public void generatePDF(WOComponent sender) {
>> if (sender == null) {
>> return;
>> }
>>
>> String generatorName = xmlGeneratorClassName();
>> if (generatorName != null) {
>> XmlGeneratorComponent xmlGenerator =
>> (XmlGeneratorComponent)sender.pageWithName(generatorName);
>
> That might be a problem there. Try this instead:
> XmlGeneratorComponent xmlGenerator =
> (XmlGeneratorComponent)WOApplication.application().pageWithName(generatorName,
> new WOContent(sender.context().request()));
>
> It is usually safer to create a new context for things like this.
>
>
> Chuck
>
>
>> PDFGenerator pdfGenerator =
>> PDFGenerator.sharedInstance();
>> pdfGenerator.generatePdfFile( this, xmlGenerator );
>> }
>> else {
>> log.error( "*** No xmlGeneratorClassName available" );
>> }
>> }
>>
>>
>> Depending on the context I call this I get a NullPointerException or not.
>> This is the NPE, context info follows below:
>>
>> Mar 25 11:13:49 ec_admin[13000] WARN NSLog -
>> <com.webobjects.appserver._private.WOComponentRequestHandler>: Exception
>> occurred while handling request:
>> java.lang.NullPointerException
>> [2011-3-25 11:13:49 CET] <WorkerThread14> java.lang.NullPointerException
>> at
>> com.webobjects.appserver._private.WOComponentReference._popComponentFromContext(WOComponentReference.java:108)
>> at
>> com.webobjects.appserver._private.WOComponentReference.invokeAction(WOComponentReference.java:128)
>> at
>> er.extensions.components._private.ERXSwitchComponent.invokeAction(ERXSwitchComponent.java:117)
>> at
>> com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
>> at
>> com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
>> at
>> er.extensions.components._private.ERXWORepetition.invokeAction(ERXWORepetition.java:496)
>> at
>> com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
>> at
>> er.extensions.components.conditionals.ERXWOConditional.invokeChildrenAction(ERXWOConditional.java:113)
>> at
>> com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
>> at
>> er.extensions.components.conditionals.ERXWOConditional.invokeAction(ERXWOConditional.java:104)
>> at
>> com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java:1079)
>> at
>> com.webobjects.appserver._private.WOComponentReference.invokeAction(WOComponentReference.java:127)
>> at
>> com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
>> at
>> com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
>> at
>> com.webobjects.appserver._private.WOComponentContent.invokeAction(WOComponentContent.java:38)
>> at
>> com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
>> at
>> com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
>> at
>> com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java:1079)
>> at
>> com.webobjects.appserver._private.WOComponentReference.invokeAction(WOComponentReference.java:127)
>> at
>> er.extensions.components._private.ERXSwitchComponent.invokeAction(ERXSwitchComponent.java:117)
>> at
>> com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
>> at
>> com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
>> at
>> com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java:1079)
>> at er.directtoweb.pages.ERD2WPage.invokeAction(ERD2WPage.java:619)
>> at
>> er.directtoweb.pages.ERD2WListPage.invokeAction(ERD2WListPage.java:479)
>> at com.webobjects.appserver.WOSession.invokeAction(WOSession.java:1357)
>> at
>> com.webobjects.appserver.WOApplication.invokeAction(WOApplication.java:1745)
>> at
>> er.extensions.appserver.ajax.ERXAjaxApplication.invokeAction(ERXAjaxApplication.java:93)
>> at
>> er.extensions.appserver.ERXApplication.invokeAction(ERXApplication.java:1863)
>> at
>> com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedPage(WOComponentRequestHandler.java:206)
>> at
>> com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedSession(WOComponentRequestHandler.java:298)
>> at
>> com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedApplication(WOComponentRequestHandler.java:332)
>> at
>> com.webobjects.appserver._private.WOComponentRequestHandler._handleRequest(WOComponentRequestHandler.java:369)
>> at
>> com.webobjects.appserver._private.WOComponentRequestHandler.handleRequest(WOComponentRequestHandler.java:442)
>> at
>> com.webobjects.appserver.WOApplication.dispatchRequest(WOApplication.java:1687)
>> at
>> er.extensions.appserver.ERXApplication.dispatchRequestImmediately(ERXApplication.java:1978)
>> at
>> er.extensions.appserver.ERXApplication.dispatchRequest(ERXApplication.java:1943)
>> at com.dsm.ec_admin.Application.dispatchRequest(Application.java:289)
>> at
>> com.webobjects.appserver._private.WOWorkerThread.runOnce(WOWorkerThread.java:144)
>> at
>> com.webobjects.appserver._private.WOWorkerThread.run(WOWorkerThread.java:226)
>> at java.lang.Thread.run(Thread.java:680)
>>
>> In some D2WInspectPages I have a nextPageDelegate. Calling from here
>> everything works.
>> This is the code in MyNextPageDelegate
>>
>> public WOComponent nextPage(WOComponent sender) {
>>
>> if (!(sender instanceof ERD2WInspectPage)) {
>> return null;
>> }
>>
>> // make sure that we are in Edit mode:
>> String task =
>> (String)((ERD2WInspectPage)sender).d2wContext().valueForKey( "task" );
>> if (! "edit".equals( task )) {
>> return null;
>> }
>>
>> // trap cancel
>> if (!((ERD2WInspectPage)sender).objectWasSaved()) {
>> return null;
>> }
>>
>> EOEnterpriseObject object =
>> (EOEnterpriseObject)sender.valueForKey( "object" );
>>
>> if (object instanceof GeneratedDocument) {
>> ((GeneratedDocument)object).generatePDF( sender );
>> }
>> return null;
>> }
>>
>> In a ListPage I have a belowPropertyKey. This is handled by a custom
>> property level component showing a WOHyperlink. When I call the same
>> business logic from the action method bound to the link the PDF is created
>> but at the end I get above mentioned NPE.
>>
>> public WOActionResults generateAll() {
>> ERD2WListPage parentListPage = parentListPage();
>> if (parentListPage != null) {
>> WODisplayGroup displayGroup = parentListPage.displayGroup();
>> NSArray<EOEnterpriseObject> objects = displayGroup.allObjects();
>> generate(objects);
>> }
>> return parentListPage;
>> }
>>
>>
>> /** Utility to return the enclosing list page, if there is one. */
>> protected ERD2WListPage parentListPage() {
>> return (ERD2WListPage)ERD2WUtilities.enclosingPageOfClass(this,
>> ListPageInterface.class);
>> }
>>
>> private void generate(NSArray<EOEnterpriseObject> objects) {
>>
>> for (EOEnterpriseObject object : objects) {
>> if (object instanceof GeneratedDocument) {
>> ((GeneratedDocument)object).generatePDF(
>> parentListPage());
>> }
>> }
>> }
>>
>> I am sure I must be overlooking something but what? Any help insanely
>> appreciated.
>> Thanks
>> ---markus---
>>
>>
>>
>>
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>
> --
> Chuck Hill Senior Consultant / VP Development
>
> Practical WebObjects - for developers who want to increase their overall
> knowledge of WebObjects or who are trying to solve specific problems.
> http://www.global-village.net/products/practical_webobjects
>
>
>
>
>
>
>
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