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Many to Many Grief

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Many to Many Grief

Subject: Many to Many Grief
From: Greg <email@hidden>
Date: Wed, 6 Apr 2005 10:08:26 +1000

Hi, I have an Entity name ProUser and another call ProService. ProService is a list of services that the user can select that they offer via checkboxes. I used the Create Many to many menu option in EOModeller to create the relationship which flattens it into ProUser. I created a component that I wanted to have a list of all the checkboxes so that the user can select which ones they want. I used a WOCheckBoxList and hooked everything up and it throws an Exception (see below). I thought this might have been me misusing the WOCheckBoxList component so I changed it to a CheckBoxMatrix with a maxColumns of 1 to effectively give the same display behaviour, but the SAME exception occurs, so I'm at a loss as to why.

I had a search through the archives and looked for previous problems and made sure that I was following the commandments of EOF (you know the ones I recite when go to bed at night and when I wake up in the morning :-)). I was trying to see if I can actually turn on debugging of the raw rows returned from the db, but couldn't seem to find anything in NSLog's javadoc.

Does anyone have any suggestions on trying to figure what is a miss?

Any help is greatly appreciated.

Regards,
Greg

2005-04-06 09:59:42,002 DEBUG ShoeBox[-:50212 2] NSLog (ERXNSLogLog4jBridge.java:44) - === Begin Internal Transaction 2005-04-06 09:59:42,007 DEBUG ShoeBox[-:50212 2] NSLog (ERXNSLogLog4jBridge.java:44) - evaluateExpression: <com.webobjects.jdbcadaptor.PostgresqlExpression: "SELECT t0.name, t0.serviceID FROM ProService t0"> 2005-04-06 09:59:42,015 DEBUG ShoeBox[-:50212 2] NSLog (ERXNSLogLog4jBridge.java:44) - 8 row(s) processed 2005-04-06 09:59:42,020 DEBUG ShoeBox[-:50212 2] NSLog (ERXNSLogLog4jBridge.java:44) - === Commit Internal Transaction 2005-04-06 09:59:42,126 WARN ShoeBox[-:50212 2] NSLog (ERXNSLogLog4jBridge.java:41) - <com.webobjects.appserver._private.WOComponentRequestHandler>: Exception occurred while handling request: java.lang.NullPointerException [2005-04-06 09:59:42 EST] <WorkerThread1> java.lang.NullPointerException at com.webobjects.foundation._NSStringUtilities.concat(_NSStringUtilities.j ava:213) at com.webobjects.eoaccess.EOSQLExpression._aliasForRelatedAttributeRelatio nshipPath(EOSQLExpression.java:264) at com.webobjects.eoaccess.EOSQLExpression.joinExpression(EOSQLExpression.j ava:1169) at com.webobjects.eoaccess.EOSQLExpression.prepareSelectExpressionWithAttri butes(EOSQLExpression.java:1033) at com.webobjects.jdbcadaptor.JDBCExpression.prepareSelectExpressionWithAtt ributes(JDBCExpression.java:273) at com.webobjects.eoaccess.EOSQLExpressionFactory.selectStatementForAttribu tes(EOSQLExpressionFactory.java:219) at com.webobjects.jdbcadaptor.JDBCChannel.selectAttributes(JDBCChannel.java :178) at com.webobjects.eoaccess.EODatabaseChannel._selectWithFetchSpecificationE ditingContext(EODatabaseChannel.java:879) at com.webobjects.eoaccess.EODatabaseChannel.selectObjectsWithFetchSpecific ation(EODatabaseChannel.java:216) at com.webobjects.eoaccess.EODatabaseContext._objectsWithFetchSpecification EditingContext(EODatabaseContext.java:3196) at com.webobjects.eoaccess.EODatabaseContext.objectsWithFetchSpecification( EODatabaseContext.java:3337) at com.webobjects.eocontrol.EOObjectStoreCoordinator.objectsWithFetchSpecif ication(EOObjectStoreCoordinator.java:539) at com.webobjects.eocontrol.EOEditingContext.objectsWithFetchSpecification( EOEditingContext.java:4053) at er.extensions.ERXEC.objectsWithFetchSpecification(ERXEC.java:547) at com.webobjects.eoaccess.EODatabaseContext.objectsForSourceGlobalID(EODat abaseContext.java:4251) at com.webobjects.eocontrol.EOObjectStoreCoordinator.objectsForSourceGlobal ID(EOObjectStoreCoordinator.java:682) at com.webobjects.eocontrol.EOEditingContext.objectsForSourceGlobalID(EOEdi tingContext.java:3904) at er.extensions.ERXEC.objectsForSourceGlobalID(ERXEC.java:517) at com.webobjects.eoaccess.EODatabaseContext._fireArrayFault(EODatabaseCont ext.java:4418) at com.webobjects.eoaccess.EOAccessArrayFaultHandler.completeInitialization OfObject(EOAccessArrayFaultHandler.java:70) at com.webobjects.eocontrol._EOCheapCopyMutableArray.willRead(_EOCheapCopyM utableArray.java:38) at com.webobjects.eocontrol._EOCheapCopyMutableArray.count(_EOCheapCopyMuta bleArray.java:92) at com.webobjects.foundation.NSArray.containsObject(NSArray.java:601) at com.webobjects.appserver._private.WOCheckBoxList.appendToResponse(WOChec kBoxList.java:254) at er.extensions.ERXPatcher$DynamicElementsPatches$CheckBoxList.appendToRes ponse(ERXPatcher.java:397) at com.webobjects.appserver._private.WODynamicGroup.appendChildrenToRespons e(WODynamicGroup.java:121) at com.webobjects.appserver._private.WOForm.appendChildrenToResponse(WOForm .java:124) at er.extensions.ERXWOForm.appendToResponse(ERXWOForm.java:68) at com.webobjects.appserver._private.WOComponentContent.appendToResponse(WO ComponentContent.java:43) at com.webobjects.appserver._private.WODynamicGroup.appendChildrenToRespons e(WODynamicGroup.java:121) at com.webobjects.appserver._private.WODynamicGroup.appendToResponse(WODyna micGroup.java:130) at com.webobjects.appserver.WOComponent.appendToResponse(WOComponent.java: 992) at com.webobjects.appserver._private.WOComponentReference.appendToResponse( WOComponentReference.java:111) at com.webobjects.appserver._private.WODynamicGroup.appendChildrenToRespons e(WODynamicGroup.java:121) at com.webobjects.appserver._private.WODynamicGroup.appendToResponse(WODyna micGroup.java:130) at com.webobjects.appserver.WOComponent.appendToResponse(WOComponent.java: 992) at au.com.shoebox.woapplication.ShoeBoxComponent.appendToResponse(ShoeBoxCo mponent.java:67) at com.webobjects.appserver.WOSession.appendToResponse(WOSession.java: 1198) at er.extensions.ERXSession.appendToResponse(ERXSession.java:510) at com.webobjects.appserver.WOApplication.appendToResponse(WOApplication.ja va:1418) at er.extensions.ERXApplication.appendToResponse(ERXApplication.java:606) at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWit hPreparedPage(WOComponentRequestHandler.java:230) at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWit hPreparedSession(WOComponentRequestHandler.java:287) at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWit hPreparedApplication(WOComponentRequestHandler.java:322) at com.webobjects.appserver._private.WOComponentRequestHandler._handleReque st(WOComponentRequestHandler.java:358) at com.webobjects.appserver._private.WOComponentRequestHandler.handleReques t(WOComponentRequestHandler.java:432) at com.webobjects.appserver.WOApplication.dispatchRequest(WOApplication.jav a:1306) at er.extensions.ERXApplication.dispatchRequest(ERXApplication.java:638) at com.webobjects.appserver._private.WOWorkerThread.runOnce(WOWorkerThread. java:173) at com.webobjects.appserver._private.WOWorkerThread.run(WOWorkerThread.java :254) at java.lang.Thread.run(Thread.java:552)

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