I am getting a really strange error when trying to change one of our
classes to an abstract class. Here is our original mapping file:
<!-- All of our persistent objects extend this class -->
<class-descriptor class="model.AdmObject">
<extent-class class-ref="model.PayrollDeductionPlan" />
</class-descriptor>
<class-descriptor
class="model.PayrollDeductionPlan"
table="dexa810t"
>
<!-- field-descriptors removed for the sake of brevity -->
</class-descriptor>
<!-- this class extends PayrollDeductionPlan -->
<class-descriptor
class="model.ClientPayrollDeductionPlan"
table="dexa820t"
>
<!-- field-descriptors removed for the sake of brevity -->
</class-descriptor>
My code works perfectly when it is like that, however, we want to make
PayrollDeductionPlan an abstract class, so I changed the mapping file to
be like this:
<class-descriptor class="model.AdmObject">
<extent-class class-ref="model.PayrollDeductionPlan" />
</class-descriptor>
<class-descriptor
class="model.PayrollDeductionPlan"
table="dexa810t"
>
<extent-class class-ref="model.ClientPayrollDeductionPlan" />
</class-descriptor>
I also moved the field-descriptors from PayrollDeductionPlan to
ClientPayrollDeductionPlan, and declared the PayrollDeductionPlan as
abstract in the java code.
When I run my code like this I get the following error:
Error 500: Server caught unhandled exception from servlet
[servlets.InheritanceServlet]: Borrow broker from pool failed, using
PBKey org.apache.ojb.broker.PBKey: jcdAlias=mysqlDS, user=VKDB2T2,
password=*****
I'm assuming that there is something else going on, the changes above
should not affect the database connection. Here is the entire
stacktrace (The "INFO: # finalize DescriptorRepository instance #"
does not show up when PayrollDeductionPlan is not abstract):
[3/15/05 8:22:26:101 CST] 4cab288f SystemOut O [DEFAULT] INFO: #
finalize DescriptorRepository instance #
[3/15/05 8:22:27:493 CST] 39ad2883 WebGroup E SRVE0026E: [Servlet
Error]-[servlets.InheritanceServlet]:
org.apache.ojb.broker.PBFactoryException: Borrow broker from pool
failed, using PBKey org.apache.ojb.broker.PBKey: jcdAlias=mysqlDS,
user=VKDB2T2, password=*****
at
org.apache.ojb.broker.core.PersistenceBrokerFactoryDefaultImpl.createPer
sistenceBroker(Unknown Source)
at
org.apache.ojb.broker.core.PersistenceBrokerFactoryBaseImpl.createPersis
tenceBroker(Unknown Source)
at
org.apache.ojb.broker.PersistenceBrokerFactory.createPersistenceBroker(U
nknown Source)
at
servlets.InheritanceServlet.doPost(InheritanceServlet.java:51)
at servlets.InheritanceServlet.doGet(InheritanceServlet.java:40)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictSe
rvletInstance.java:110)
at
com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLi
fecycleServlet.java:174)
at
com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycle
Servlet.java:313)
at
com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLif
ecycleServlet.java:116)
at
com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.
java:283)
at
com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(Vali
dServletReferenceState.java:42)
at
com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(Servle
tInstanceReference.java:40)
at
com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispa
tch(WebAppRequestDispatcher.java:948)
at
com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRe
questDispatcher.java:530)
at
com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppReq
uestDispatcher.java:176)
at
com.ibm.ws.webcontainer.servlet.InvokerServlet.service(InvokerServlet.ja
va:255)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictSe
rvletInstance.java:110)
at
com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLi
fecycleServlet.java:174)
at
com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycle
Servlet.java:313)
at
com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLif
ecycleServlet.java:116)
at
com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.
java:283)
at
com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(Vali
dServletReferenceState.java:42)
at
com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(Servle
tInstanceReference.java:40)
at
com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispa
tch(WebAppRequestDispatcher.java:948)
at
com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRe
questDispatcher.java:530)
at
com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppReq
uestDispatcher.java:176)
at
com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java:7
9)
at
com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInv
oker.java:201)
at
com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocati
on(CachedInvocation.java:71)
at
com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(Servle
tRequestProcessor.java:182)
at
com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSELis
tener.java:334)
at
com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection
.java:56)
at
com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:
610)
at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:431)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:593)
Caused by: org.apache.ojb.broker.metadata.MetadataException: Can't read
repository file 'repository.xml'
at org.apache.ojb.broker.metadata.MetadataManager.init(Unknown
Source)
at org.apache.ojb.broker.metadata.MetadataManager.<init>(Unknown
Source)
at
org.apache.ojb.broker.metadata.MetadataManager.getInstance(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerFactoryBaseImpl.createNewBro
kerInstance(Unknown Source)
at
org.apache.ojb.broker.core.PersistenceBrokerFactoryDefaultImpl$PBKeyedPo
olableObjectFactory.makeObject(Unknown Source)
at
org.apache.commons.pool.impl.GenericKeyedObjectPool.borrowObject(Generic
KeyedObjectPool.java:747)
... 38 more
Caused by: java.lang.NullPointerException
at
org.apache.xerces.parsers.AbstractSAXParser.parse(AbstractSAXParser.java
:1194)
at
org.apache.ojb.broker.metadata.RepositoryPersistor.readMetadataFromXML(U
nknown Source)
at
org.apache.ojb.broker.metadata.RepositoryPersistor.buildRepository(Unkno
wn Source)
at
org.apache.ojb.broker.metadata.RepositoryPersistor.readDescriptorReposit
ory(Unknown Source)
... 44 more
Caused by: java.lang.NullPointerException
at
org.apache.ojb.broker.metadata.fieldaccess.AnonymousPersistentFieldHelpe
r.computeInheritedPersistentFields(Unknown Source)
at
org.apache.ojb.broker.metadata.RepositoryXmlHandler.endDocument(Unknown
Source)
at
org.apache.xerces.parsers.AbstractSAXParser.endDocument(AbstractSAXParse
r.java:725)
at
org.apache.xerces.impl.XMLNamespaceBinder.endDocument(XMLNamespaceBinder
.java:704)
at
org.apache.xerces.impl.dtd.XMLDTDValidator.endDocument(XMLDTDValidator.j
ava:998)
at
org.apache.xerces.impl.XMLDocumentScannerImpl.endEntity(XMLDocumentScann
erImpl.java:455)
at
org.apache.xerces.impl.XMLEntityManager.endEntity(XMLEntityManager.java:
1288)
at
org.apache.xerces.impl.XMLEntityManager$EntityScanner.load(XMLEntityMana
ger.java(Compiled Code))
at
org.apache.xerces.impl.XMLEntityManager$EntityScanner.skipSpaces(XMLEnti
tyManager.java(Compiled Code))
at
org.apache.xerces.impl.XMLDocumentScannerImpl$TrailingMiscDispatcher.dis
patch(XMLDocumentScannerImpl.java:1011)
at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDo
cumentFragmentScannerImpl.java:333)
at
org.apache.xerces.parsers.StandardParserConfiguration.parse(StandardPars
erConfiguration.java:525)
at
org.apache.xerces.parsers.StandardParserConfiguration.parse(StandardPars
erConfiguration.java:581)
at org.apache.xerces.parsers.XMLParser.parse(XMLParser.java:147)
at
org.apache.xerces.parsers.AbstractSAXParser.parse(AbstractSAXParser.java
:1158)
... 47 more
Anyone have any ideas on what the problem could be?
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