Re: Weird NullPointerException
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
Weird NullPointerException
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);
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
Re: Weird NullPointerException
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
