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https://issues.apache.org/jira/browse/CAY-2097?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Savva Kolbachev closed CAY-2097.
--------------------------------
Resolution: Fixed
> NullPointerException while updating relationships for entities with vertical
> inheritance
> ----------------------------------------------------------------------------------------
>
> Key: CAY-2097
> URL: https://issues.apache.org/jira/browse/CAY-2097
> Project: Cayenne
> Issue Type: Bug
> Affects Versions: 4.0.M3
> Reporter: Savva Kolbachev
> Assignee: Savva Kolbachev
> Fix For: 4.0.M4
>
>
> Forwarded from mail list:
> I have a class Company with a one-to-many relationship to other Companies
> (parentCompany <- subCompanies). I’m able to set a Company’s parent when
> creating one, but upon update I’m getting a NullPointerException in
> DefaultQuotingStrategy.quotedName because it’s been sent a null attribute.
> Company extends the abstract class Entity; on the DB side Entity and Company
> have a one-to-one relationship, and Entity has a parentEntity reference
> (which is modeled as parentCompany). The obj-relationship parentCompany is
> set up with the target Company and path parentEntity.
> The null attribute is being added in
> org.apache.cayenne.access.DataDomainUpdateBucket.updatedAttributes. The
> method is called first with the dbEntity Entity and the an updatedSnapshot
> containing parentEntity, which is what I would expect. However, after this
> updatedAttributes is called with Company and an updatedSnapshot containing
> parentEntity, so the following line
> attributes.add(entityAttributes.get(name))
> will return a null attribute when trying to get the name “parentEntity” off
> Company’s attributes; that attribute only exists on Entity. I’d appreciate
> any help on preventing it from trying to add invalid attributes.
> Here’s the stack trace:
> java.lang.NullPointerException
> at
> org.apache.cayenne.dba.DefaultQuotingStrategy.quotedName(DefaultQuotingStrategy.java:62)
> at
> org.apache.cayenne.access.translator.batch.UpdateBatchTranslator.createSql(UpdateBatchTranslator.java:60)
> at
> org.apache.cayenne.access.translator.batch.DefaultBatchTranslator.ensureTranslated(DefaultBatchTranslator.java:52)
> at
> org.apache.cayenne.access.translator.batch.DefaultBatchTranslator.getSql(DefaultBatchTranslator.java:64)
> at
> org.apache.cayenne.access.jdbc.BatchAction.runAsBatch(BatchAction.java:103)
> at
> org.apache.cayenne.access.jdbc.BatchAction.performAction(BatchAction.java:90)
> at
> org.apache.cayenne.access.DataNodeQueryAction.runQuery(DataNodeQueryAction.java:97)
> at
> org.apache.cayenne.access.DataNode.performQueries(DataNode.java:293)
> at
> org.apache.cayenne.access.DataDomainFlushAction.runQueries(DataDomainFlushAction.java:233)
> at
> org.apache.cayenne.access.DataDomainFlushAction.flush(DataDomainFlushAction.java:154)
> at
> org.apache.cayenne.access.DataDomain.onSyncFlush(DataDomain.java:693)
> at
> org.apache.cayenne.access.DataDomain$2.transform(DataDomain.java:659)
> at
> org.apache.cayenne.access.DataDomain.runInTransaction(DataDomain.java:720)
> at
> org.apache.cayenne.access.DataDomain.onSyncNoFilters(DataDomain.java:655)
> at
> org.apache.cayenne.access.DataDomain$DataDomainSyncFilterChain.onSync(DataDomain.java:863)
> at org.apache.cayenne.access.DataDomain.onSync(DataDomain.java:636)
> at
> org.apache.cayenne.access.DataContext.flushToParent(DataContext.java:727)
> at
> org.apache.cayenne.access.DataContext.commitChanges(DataContext.java:676)
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