Update on my search:
I have began going through the source and the null pointer is a result
of the following line in buildSuperJoinTree() in class
SqlQueryStatement:
TableAlias base_alias = getTableAliasForPath( name, null );
What is happening is that the variable 'name' is set to the value:
"mStakeholder.mTopicsOfInterest"
The result of calling the method getTableAliasForPath with that string
is a null value is set to base_alias. This obviously results in a NPE.
If someone could advise me which direction I should look for the problem
from here. I see it as two options: check the getTableAliasForPath()
method to see why it returns null; Find out why the variable name is set
to "mStakeholder.mTopicsOfInterest".
Thanks.
-----Original Message-----
From: Phil Armour
Sent: Monday, April 12, 2004 12:12 PM
To: [EMAIL PROTECTED]
Subject: addEqualTo throws Exception on 2-deep reference-descriptor
Hi,
I am getting a null pointer exception when adding an EqualTo query term
that references the second embedded object. For example: I have a
Contact object that contains a reference-descriptor to a Stakeholder.
This stakeholder then contains a collection-descriptor to other Objects
(TopicsOfInterest). What I am trying to do is add the following
criteria term:
crit.addEqualTo("mStakeholder.mTopicsOfInterest.mId",new
Long(getDdid()));
The Exception I get is:
java.lang.NullPointerException
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.buildSuperJoinTr
ee(SqlQueryStatement.java:1531)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.getTableAlias(Sq
lQueryStatement.java:1006)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.buildJoinTreeFor
Column(SqlQueryStatement.java:1501)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.buildJoinTree(Sq
lQueryStatement.java:1478)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.buildJoinTree(Sq
lQueryStatement.java:1467)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.splitCriteria(Sq
lQueryStatement.java:1556)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.<init>(SqlQueryS
tatement.java:155)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.<init>(SqlQueryS
tatement.java:111)
at
org.apache.ojb.broker.accesslayer.sql.SqlSelectStatement.<init>(SqlSelec
tStatement.java:89)
at
org.apache.ojb.broker.accesslayer.sql.SqlGeneratorDefaultImpl.getPrepare
dSelectStatement(SqlGeneratorDefaultImpl.java:196)
at
org.apache.ojb.broker.accesslayer.JdbcAccessImpl.executeQuery(JdbcAccess
Impl.java:306)
at
org.apache.ojb.broker.accesslayer.RsIterator.<init>(RsIterator.java:209)
at
org.apache.ojb.broker.core.RsIteratorFactoryImpl.createRsIterator(RsIter
atorFactoryImpl.java:95)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getRsIteratorFromQuery(
PersistenceBrokerImpl.java:2426)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getIteratorFromQuery(Pe
rsistenceBrokerImpl.java:1766)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Pe
rsistenceBrokerImpl.java:1372)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Pe
rsistenceBrokerImpl.java:1563)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Pe
rsistenceBrokerImpl.java:1599)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Pe
rsistenceBrokerImpl.java:1588)
at
org.apache.ojb.broker.core.DelegatingPersistenceBroker.getCollectionByQu
ery(DelegatingPersistenceBroker.java:322)
at
org.apache.ojb.broker.core.DelegatingPersistenceBroker.getCollectionByQu
ery(DelegatingPersistenceBroker.java:322)
at
appian.tracking.services.TrackingService.getCollection(TrackingService.j
ava:94)
at
appian.tracking.services.CaseService.getCasesByFolder(CaseService.java:3
58)
at
appian.tracking.services.CaseService.getCasesByFolder(CaseService.java:3
36)
at
appian.tracking.cases.case056.TOISearch.generate(TOISearch.java:62)
at
appian.tracking.actions.CustomCaseReportAction.execute(CustomCaseReportA
ction.java:40)
at
org.apache.struts.action.RequestProcessor.processActionPerform(RequestPr
ocessor.java:484)
at
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:
274)
at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
at
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
tionFilterChain.java:284)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
erChain.java:204)
at
appian.tracking.util.loginFilter.doFilter(loginFilter.java:104)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
tionFilterChain.java:233)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
erChain.java:204)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv
e.java:257)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveCo
ntext.java:151)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:5
64)
at
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardCon
textValve.java:245)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv
e.java:199)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveCo
ntext.java:151)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:5
64)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
:195)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveCo
ntext.java:151)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
:164)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveCo
ntext.java:149)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:5
64)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.
java:156)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveCo
ntext.java:151)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:5
64)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
at
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:82
8)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processC
onnection(Http11Protocol.java:700)
at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:58
4)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool
.java:683)
at java.lang.Thread.run(Thread.java:534)
rethrown as
org.apache.ojb.broker.PersistenceBrokerException
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Pe
rsistenceBrokerImpl.java:1570)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Pe
rsistenceBrokerImpl.java:1599)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Pe
rsistenceBrokerImpl.java:1588)
at
org.apache.ojb.broker.core.DelegatingPersistenceBroker.getCollectionByQu
ery(DelegatingPersistenceBroker.java:322)
at
org.apache.ojb.broker.core.DelegatingPersistenceBroker.getCollectionByQu
ery(DelegatingPersistenceBroker.java:322)
at
appian.tracking.services.TrackingService.getCollection(TrackingService.j
ava:94)
at
appian.tracking.services.CaseService.getCasesByFolder(CaseService.java:3
58)
at
appian.tracking.services.CaseService.getCasesByFolder(CaseService.java:3
36)
at
appian.tracking.cases.case056.TOISearch.generate(TOISearch.java:62)
at
appian.tracking.actions.CustomCaseReportAction.execute(CustomCaseReportA
ction.java:40)
at
org.apache.struts.action.RequestProcessor.processActionPerform(RequestPr
ocessor.java:484)
at
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:
274)
at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
at
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
tionFilterChain.java:284)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
erChain.java:204)
at
appian.tracking.util.loginFilter.doFilter(loginFilter.java:104)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
tionFilterChain.java:233)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
erChain.java:204)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv
e.java:257)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveCo
ntext.java:151)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:5
64)
at
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardCon
textValve.java:245)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv
e.java:199)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveCo
ntext.java:151)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:5
64)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
:195)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveCo
ntext.java:151)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
:164)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveCo
ntext.java:149)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:5
64)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.
java:156)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveCo
ntext.java:151)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:5
64)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
at
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:82
8)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processC
onnection(Http11Protocol.java:700)
at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:58
4)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool
.java:683)
at java.lang.Thread.run(Thread.java:534)
Caused by: java.lang.NullPointerException
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.buildSuperJoinTr
ee(SqlQueryStatement.java:1531)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.getTableAlias(Sq
lQueryStatement.java:1006)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.buildJoinTreeFor
Column(SqlQueryStatement.java:1501)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.buildJoinTree(Sq
lQueryStatement.java:1478)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.buildJoinTree(Sq
lQueryStatement.java:1467)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.splitCriteria(Sq
lQueryStatement.java:1556)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.<init>(SqlQueryS
tatement.java:155)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.<init>(SqlQueryS
tatement.java:111)
at
org.apache.ojb.broker.accesslayer.sql.SqlSelectStatement.<init>(SqlSelec
tStatement.java:89)
at
org.apache.ojb.broker.accesslayer.sql.SqlGeneratorDefaultImpl.getPrepare
dSelectStatement(SqlGeneratorDefaultImpl.java:196)
at
org.apache.ojb.broker.accesslayer.JdbcAccessImpl.executeQuery(JdbcAccess
Impl.java:306)
at
org.apache.ojb.broker.accesslayer.RsIterator.<init>(RsIterator.java:209)
at
org.apache.ojb.broker.core.RsIteratorFactoryImpl.createRsIterator(RsIter
atorFactoryImpl.java:95)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getRsIteratorFromQuery(
PersistenceBrokerImpl.java:2426)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getIteratorFromQuery(Pe
rsistenceBrokerImpl.java:1766)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Pe
rsistenceBrokerImpl.java:1372)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Pe
rsistenceBrokerImpl.java:1563)
... 42 more
I have no problems when querying for Stakeholders given the
TopicOfInterest or for Contacts given the Stakeholder. My problem only
arises when going the extra level of depth. Such a query seems like a
common requirement so I am wondering if anyone has encountered this
error, or more likely, can point out where I am missing something
obvious.
Further I tested with just a regular reference-descriptor (instead of
the collection) and got the same error.
Another note is that the Contact and Stakeholder are implementations of
an abstract class and they each use separate tables.
_________________________________________
Phil Armour
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