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NullPointerException in DerbyPlugIn$DerbyExpression.isLOBAttribute
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NullPointerException in DerbyPlugIn$DerbyExpression.isLOBAttribute

  • Subject: NullPointerException in DerbyPlugIn$DerbyExpression.isLOBAttribute
  • From: Marvin <email@hidden>
  • Date: Sat, 04 Sep 2010 08:58:12 +0000 (GMT)
Hi,

I am new to WebObjects and am working through the documentation and Apple's Movies tutorial found here: http://developer.apple.com/legacy/mac/library/documentation/DeveloperTools/Conceptual/WOTutorial/DatabaseApplication/DatabaseApplication.html.

I am running on Mac OS 10.6.4.

I was able to get WebObects installed (version 5.4.3) along with the WOLips plugin for eclipse obtained from: http://wiki.objectstyle.org/confluence/display/WOL/Installing+WOLips.  I installed it using method 2.

I am using the built in VelocityEOGenerator with the Entity.java templates obtained from: http://wiki.objectstyle.org/confluence/display/WOL/EOGenerator+Templates+and+Additions.

I have created the Movies database and have generated the Movies entities using the EO Generator and can launch the application but when I do a search as instructed in the tutorial I get the following exception.  I have searched this mailing list archive and the web for elements of this error but have not had any luck  Does anyone have any idea what is going wrong?

Thanks for the help.

Marvin


[2010-9-4 4:3:15 EDT] <main> Waiting for requests...
java.lang.NullPointerException
at com.webobjects.jdbcadaptor.DerbyPlugIn$DerbyExpression.isLOBAttribute(DerbyPlugIn.java:345)
at com.webobjects.jdbcadaptor.DerbyPlugIn$DerbyExpression.shouldUseBindVariableForAttribute(DerbyPlugIn.java:361)
at com.webobjects.eoaccess.EOSQLExpression.sqlStringForValue(EOSQLExpression.java:1965)
at com.webobjects.eoaccess.EOSQLExpression.sqlStringForKeyValueQualifier(EOSQLExpression.java:1659)
at com.webobjects.eoaccess.EOQualifierSQLGeneration$_KeyValueQualifierSupport.sqlStringForSQLExpression(EOQualifierSQLGeneration.java:463)
at com.webobjects.eoaccess.EOQualifierSQLGeneration$Support._sqlStringForSQLExpression(EOQualifierSQLGeneration.java:165)
at com.webobjects.eoaccess.EOSQLExpression.sqlStringForArrayOfQualifiers(EOSQLExpression.java:1528)
at com.webobjects.eoaccess.EOSQLExpression.sqlStringForConjoinedQualifiers(EOSQLExpression.java:1560)
at com.webobjects.eoaccess.EOQualifierSQLGeneration$_AndQualifierSupport.sqlStringForSQLExpression(EOQualifierSQLGeneration.java:541)
at com.webobjects.eoaccess.EOQualifierSQLGeneration$Support._sqlStringForSQLExpression(EOQualifierSQLGeneration.java:165)
at com.webobjects.eoaccess.EOSQLExpression.prepareSelectExpressionWithAttributes(EOSQLExpression.java:997)
at com.webobjects.jdbcadaptor.JDBCExpression.prepareSelectExpressionWithAttributes(JDBCExpression.java:146)
at com.webobjects.eoaccess.EOSQLExpressionFactory.selectStatementForAttributes(EOSQLExpressionFactory.java:225)
at com.webobjects.jdbcadaptor.JDBCChannel.selectAttributes(JDBCChannel.java:213)
at com.webobjects.eoaccess.EODatabaseChannel._selectWithFetchSpecificationEditingContext(EODatabaseChannel.java:897)
at com.webobjects.eoaccess.EODatabaseChannel.selectObjectsWithFetchSpecification(EODatabaseChannel.java:234)
at com.webobjects.eoaccess.EODatabaseContext._objectsWithFetchSpecificationEditingContext(EODatabaseContext.java:3055)
at com.webobjects.eoaccess.EODatabaseContext.objectsWithFetchSpecification(EODatabaseContext.java:3195)
at com.webobjects.eocontrol.EOObjectStoreCoordinator.objectsWithFetchSpecification(EOObjectStoreCoordinator.java:488)
at com.webobjects.eocontrol.EOEditingContext.objectsWithFetchSpecification(EOEditingContext.java:4069)
at com.webobjects.eocontrol.EOEditingContext.objectsWithFetchSpecification(EOEditingContext.java:4444)
at your.app.eo._Movie.fetchMovies(_Movie.java:84)
at your.app.components.Main.searchMovies(Main.java:75)
at sunreflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.webobjects.foundation.NSKeyValueCoding$ValueAccessor$1.methodValue(NSKeyValueCoding.java:636)
at com.webobjects.foundation.NSKeyValueCoding$_MethodBinding.valueInObject(NSKeyValueCoding.java:1134)
at com.webobjects.foundation.NSKeyValueCoding$DefaultImplementation.valueForKey(NSKeyValueCoding.java:1324)
at com.webobjects.appserver.WOComponent.valueForKey(WOComponent.java:1736)
at com.webobjects.foundation.NSKeyValueCoding$Utility.valueForKey(NSKeyValueCoding.java:447)
at com.webobjects.foundation.NSKeyValueCodingAdditions$DefaultImplementation.valueForKeyPath(NSKeyValueCodingAdditions.java:212)
at com.webobjects.appserver.WOComponent.valueForKeyPath(WOComponent.java:1804)
at com.webobjects.appserver._private.WOKeyValueAssociation.valueInComponent(WOKeyValueAssociation.java:50)
at com.webobjects.appserver._private.WOSubmitButton.invokeAction(WOSubmitButton.java:81)
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.WOForm.invokeAction(WOForm.java:141)
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.WOSession.invokeAction(WOSession.java:1357)
at com.webobjects.appserver.WOApplication.invokeAction(WOApplication.java:1745)
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 comwebobjects.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 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:637)

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