[CAY-2367] ClassCastException reading object with an attribute of type 'char'

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 4.1.M1
• Fix Version/s: 4.0.RC1, 4.1.M1
• Assignee: Nikita Timofeev
• Reporter: Andrus Adamchik
• Created: 23/Sep/17 15:01
• Updated: 03/Oct/17 08:48
• Resolved: 03/Oct/17 08:48

Description

I found this issue when testing 4.1.M1 with LinkRest, but I wouldn't be surprised if it existed before and was hidden by the generic nature of CayenneDataObject:

DbAttribute: CHAR(1)
ObjAttribute: char

When selecting this object, a warning about ExtendedType is printed, and the exception like the one below is thrown:

[main] WARN org.apache.cayenne.access.types.SerializableTypeFactory - Haven't found suitable ExtendedType for class 'char'. Most likely you need to define a custom ExtendedType.
[main] INFO org.apache.cayenne.log.JdbcEventLogger - === returned 1 row. - took 17 ms.
[main] INFO org.apache.cayenne.log.JdbcEventLogger - +++ transaction committed.
[main] WARN com.nhl.link.rest.provider.CayenneRuntimeExceptionMapper - Cayenne exception
org.apache.cayenne.reflect.PropertyException: [v.4.1.M1 Sep 22 2017 12:43:32] Error writing DataObject property: charPrimitive
	at org.apache.cayenne.reflect.generic.DataObjectBaseProperty.writePropertyDirectly(DataObjectBaseProperty.java:88)
	at org.apache.cayenne.access.DataRowUtils$1.visitAttribute(DataRowUtils.java:93)
	at org.apache.cayenne.reflect.generic.DataObjectAttributeProperty.visit(DataObjectAttributeProperty.java:50)
	at org.apache.cayenne.reflect.PersistentDescriptor.visitProperties(PersistentDescriptor.java:400)
	at org.apache.cayenne.reflect.LazyClassDescriptorDecorator.visitProperties(LazyClassDescriptorDecorator.java:174)
	at org.apache.cayenne.access.DataRowUtils.refreshObjectWithSnapshot(DataRowUtils.java:86)
	at org.apache.cayenne.access.DataRowUtils.mergeObjectWithSnapshot(DataRowUtils.java:62)
	at org.apache.cayenne.access.ObjectResolver.objectFromDataRow(ObjectResolver.java:170)
	at org.apache.cayenne.access.ObjectResolver.objectFromDataRow(ObjectResolver.java:134)
	at org.apache.cayenne.access.ObjectResolver.objectsFromDataRows(ObjectResolver.java:119)
	at org.apache.cayenne.access.ObjectResolver.synchronizedObjectsFromDataRows(ObjectResolver.java:99)
	at org.apache.cayenne.access.ObjectResolver.synchronizedRootResultNodeFromDataRows(ObjectResolver.java:90)
	at org.apache.cayenne.access.DataDomainQueryAction$ObjectConversionStrategy.toResultsTree(DataDomainQueryAction.java:637)
	at org.apache.cayenne.access.DataDomainQueryAction$SingleObjectConversionStrategy.convert(DataDomainQueryAction.java:687)
	at org.apache.cayenne.access.DataDomainQueryAction.interceptObjectConversion(DataDomainQueryAction.java:501)
	at org.apache.cayenne.access.DataDomainQueryAction.execute(DataDomainQueryAction.java:130)
	at org.apache.cayenne.access.DataDomain.onQueryNoFilters(DataDomain.java:564)
	at org.apache.cayenne.access.DataDomain$DataDomainQueryFilterChain.onQuery(DataDomain.java:748)
	at org.apache.cayenne.tx.TransactionFilter.onQuery(TransactionFilter.java:49)
	at org.apache.cayenne.access.DataDomain$DataDomainQueryFilterChain.onQuery(DataDomain.java:748)
	at com.nhl.link.rest.it.fixture.DynamicModelLoader.onQuery(DynamicModelLoader.java:39)
	at org.apache.cayenne.access.DataDomain$DataDomainQueryFilterChain.onQuery(DataDomain.java:748)
	at org.apache.cayenne.access.DataDomain.onQuery(DataDomain.java:556)
	at org.apache.cayenne.util.ObjectContextQueryAction.runQuery(ObjectContextQueryAction.java:406)
	at org.apache.cayenne.util.ObjectContextQueryAction.executePostCache(ObjectContextQueryAction.java:107)
	at org.apache.cayenne.util.ObjectContextQueryAction.execute(ObjectContextQueryAction.java:94)
	at org.apache.cayenne.access.DataContext.onQuery(DataContext.java:965)
	at org.apache.cayenne.access.DataContext.performQuery(DataContext.java:954)
	at org.apache.cayenne.BaseContext.select(BaseContext.java:307)
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Character
	at com.nhl.link.rest.it.fixture.cayenne.auto._E19.writePropertyDirectly(_E19.java:405)
	at org.apache.cayenne.reflect.generic.DataObjectBaseProperty.writePropertyDirectly(DataObjectBaseProperty.java:84)
	... 95 more