[jira] [Created] (CAY-2097) NullPointerException while updating relationships for entities with vertical inheritance

["Savva Kolbachev (JIRA)" <ji...@apache.org>]

Savva Kolbachev created CAY-2097:
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             Summary: 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:
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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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