Andrey created CAY-1940:
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Summary: NullPointerException when try to Prefetch
Key: CAY-1940
URL: https://issues.apache.org/jira/browse/CAY-1940
Project: Cayenne
Issue Type: Bug
Components: Core Library, Database integration
Affects Versions: 3.2M1
Environment: Ubuntu 14.04lts, Java 1.7, Mysql 5.5.37
Reporter: Andrey
Use case description:
Cayenne model:
Tables:
Contact
id -primary key
name - string
Course
id - primary key
name - string
Relation
id - primary key
entityIdentifier - entity name of related object
entityId - id of related object
ruleId - id of rule
Rule
id - primary key
name - string
Classes:
Contact
properties: id, name
relations: List< ContactRuleRelation> ruleRelations
Course
properties: id, name
relations: List< CourseRuleRelation > ruleRelations
RuleRelation
properties: id, entityIdentifier
relations: rule
ContactRuleRelation extends RuleRelation
(entityIdentifier = 'Contact')
CourseRuleRelation extends RuleRelation
(entityIdentifier = 'Course')
Rule
properties: id, name
Data in the database:
Contact: id=1, name=Contact1
Course: id=1, name=Course1
Relation: id=1, objectIdentifier=Course, objectID=1, ruleId=1
Rule: id=1, name=Rule1
SelectQuery:
select Contact by id = 1 and add prefetch relations.rule
As result the exception:
java.lang.NullPointerException
at
org.apache.cayenne.access.ResultScanParentAttachmentStrategy.indexParents(ResultScanParentAttachmentStrategy.java:104)
at
org.apache.cayenne.access.ResultScanParentAttachmentStrategy.linkToParent(ResultScanParentAttachmentStrategy.java:72)
at
org.apache.cayenne.access.HierarchicalObjectResolverNode.objectsFromDataRows(HierarchicalObjectResolverNode.java:70)
at
org.apache.cayenne.access.HierarchicalObjectResolver$DisjointProcessor.startDisjointPrefetch(HierarchicalObjectResolver.java:121)
at
org.apache.cayenne.query.PrefetchTreeNode.traverse(PrefetchTreeNode.java:206)
at
org.apache.cayenne.query.PrefetchTreeNode.traverse(PrefetchTreeNode.java:221)
at
org.apache.cayenne.query.PrefetchTreeNode.traverse(PrefetchTreeNode.java:221)
at
org.apache.cayenne.access.HierarchicalObjectResolver.resolveObjectTree(HierarchicalObjectResolver.java:96)
at
org.apache.cayenne.access.HierarchicalObjectResolver.synchronizedRootResultNodeFromDataRows(HierarchicalObjectResolver.java:78)
at
org.apache.cayenne.access.DataDomainQueryAction$ObjectConversionStrategy.toResultsTree(DataDomainQueryAction.java:565)
at
org.apache.cayenne.access.DataDomainQueryAction$SingleObjectConversionStrategy.convert(DataDomainQueryAction.java:603)
at
org.apache.cayenne.access.DataDomainQueryAction.interceptObjectConversion(DataDomainQueryAction.java:459)
at
org.apache.cayenne.access.DataDomainQueryAction.execute(DataDomainQueryAction.java:129)
at
org.apache.cayenne.access.DataDomain.onQueryNoFilters(DataDomain.java:605)
at
org.apache.cayenne.access.DataDomain$DataDomainQueryFilterChain.onQuery(DataDomain.java:838)
Looks like Cayenne considers only entityId without entityIdentifier when try to
load the prefetch.
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