If I have an object:
Contact with a field List<ContactMethod> listofContactMethods, when I run a
query:
select Contact where id = x I get a list of Contact objects back and when I try
to access any of them beyond checking for null I get:
com.adaptavant.distributedsource.dao.ContactDAO getContactByOwner: null
java.lang.NullPointerException
at com.google.appengine.api.datastore.AsyncDatastoreServiceImpl$EntityGroupGrouper.getEntityGroupKey(AsyncDatastoreServiceImpl.java:168)
at com.google.appengine.api.datastore.AsyncDatastoreServiceImpl$2.extractEntityGroupKey(AsyncDatastoreServiceImpl.java:197)
at com.google.appengine.api.datastore.AsyncDatastoreServiceImpl$2.extractEntityGroupKey(AsyncDatastoreServiceImpl.java:194)
at com.google.appengine.api.datastore.AsyncDatastoreServiceImpl$EntityGroupGrouper.getItemsByEntityGroup(AsyncDatastoreServiceImpl.java:155)
at com.google.appengine.api.datastore.AsyncDatastoreServiceImpl.get(AsyncDatastoreServiceImpl.java:276)
at com.google.appengine.api.datastore.DatastoreServiceImpl$1.runInternal(DatastoreServiceImpl.java:68)
at com.google.appengine.api.datastore.DatastoreServiceImpl$1.runInternal(DatastoreServiceImpl.java:65)
at com.google.appengine.api.datastore.TransactionRunner.runInTransaction(TransactionRunner.java:29)
at com.google.appengine.api.datastore.DatastoreServiceImpl.get(DatastoreServiceImpl.java:65)
at com.google.appengine.datanucleus.WrappedDatastoreService.get(WrappedDatastoreService.java:80)
at com.google.appengine.datanucleus.FetchFieldManager.getCollectionFromDatastoreObject(FetchFieldManager.java:666)
at com.google.appengine.datanucleus.FetchFieldManager.fetchRelationField(FetchFieldManager.java:483)
at com.google.appengine.datanucleus.FetchFieldManager.fetchObjectField(FetchFieldManager.java:405)
at org.datanucleus.state.AbstractStateManager.replacingObjectField(AbstractStateManager.java:2353)
at com.adaptavant.distributedsource.objects.Contact.jdoReplaceField(Contact.java)
at com.adaptavant.distributedsource.objects.Contact.jdoReplaceFields(Contact.java)
at org.datanucleus.state.JDOStateManager.replaceFields(JDOStateManager.java:1935)
at org.datanucleus.state.JDOStateManager.replaceFields(JDOStateManager.java:1962)
at com.google.appengine.datanucleus.EntityUtils$1.fetchFields(EntityUtils.java:974)
at org.datanucleus.state.JDOStateManager.loadFieldValues(JDOStateManager.java:764)
at org.datanucleus.state.JDOStateManager.initialiseForHollow(JDOStateManager.java:205)
at org.datanucleus.state.StateManagerFactory.newForHollowPopulated(StateManagerFactory.java:89)
at org.datanucleus.state.ObjectProviderFactory.newForHollowPopulated(ObjectProviderFactory.java:75)
at org.datanucleus.ObjectManagerImpl.findObject(ObjectManagerImpl.java:2882)
at com.google.appengine.datanucleus.EntityUtils.entityToPojo(EntityUtils.java:1014)
at com.google.appengine.datanucleus.query.DatastoreQuery$2.apply(DatastoreQuery.java:229)
at com.google.appengine.datanucleus.query.DatastoreQuery$2.apply(DatastoreQuery.java:226)
at com.google.appengine.datanucleus.query.LazyResult.resolveNext(LazyResult.java:96)
at com.google.appengine.datanucleus.query.LazyResult.resolveAll(LazyResult.java:121)
at com.google.appengine.datanucleus.query.LazyResult.size(LazyResult.java:115)
at com.google.appengine.datanucleus.query.StreamingQueryResult.size(StreamingQueryResult.java:151)
at com.adaptavant.distributedsource.dao.ContactDAO.getContactByOwner(ContactDAO.java:450)
at com.synclio.controller.ContactsMain.getFriendsList(ContactsMain.java:135)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_$1.run(Method_.java:167)
at java.security.AccessController.doPrivileged(Native Method)
at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.privilegedInvoke(Method_.java:164)
at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.invoke_(Method_.java:125)
at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.invoke(Method_.java:43)
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:746)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:687)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:915)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:811)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:796)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:125)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:57)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:266)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:146)
at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:438)
at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:480)
at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:487)
at com.google.tracing.TraceContext.runInContext(TraceContext.java:774)
at com.google.tracing.TraceContext$DoInTraceContext.runInContext(TraceContext.java:751)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:342)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:334)
Attached are the specific java files that cause this issue and the method
acting on them is:
public static List<Contact> getContactByOwner(List<String> ownerID) {
PersistenceManager pm = null;
List<Contact> contactListFromDb = new ArrayList<Contact>();
List<Contact> lContact = new ArrayList<Contact>();
try {
mLogger.info("getContactByOwner:: starting query...");
pm = PMF.get().getPersistenceManager();
Query query = pm.newQuery(Contact.class, "ownerID == :ownerID && deleted == false");
query.setOrdering("firstName asc");
mLogger.info("getContactByOwner:: executing query with ownerID " + ownerID);
lContact = (List<Contact>) query.execute(ownerID);
mLogger.info("getContactByOwner:: after execute");
// mLogger.info("ContactList" + lContact);
// mLogger.info("ContactList Size:::" + lContact.size());
if (lContact != null) {
if (lContact.size() > 0) {
Iterator<Contact> iterator = lContact.iterator();
while (iterator.hasNext()) {
Contact lTouchContact = iterator.next();
mLogger.info("getContactByOwner:: Got contact" + lTouchContact);
List<ContactMethod> lContactMethods = lTouchContact.getListOfContactMethod();
Iterator<ContactMethod> conatctMethodIterator = lContactMethods.iterator();
while (conatctMethodIterator.hasNext()) {
mLogger.info("getContactByOwner:: Got contact method " + conatctMethodIterator.next());
}
}
}
contactListFromDb.addAll(pm.detachCopyAll(lContact));
}
} catch (Exception e) {
mLogger.log(Level.WARNING, e.getMessage(), e);
} finally {
mLogger.info("pm is " + pm);
if (pm != null) {
pm.close();
}
}
return contactListFromDb;
}
the line "if (lContact.size() > 0) {" causes the exception to be thrown. The
log also contains the warning:
com.google.appengine.datanucleus.MetaDataValidator warn: Meta-data warning for
com.adaptavant.distributedsource.objects.Contact.listOfLocation: Error in
meta-data for com.adaptavant.distributedsource.objects.Contact.listOfLocation :
The datastore does not support joins and therefore cannot honor requests to
place related objects in the default fetch group. The field will be fetched
lazily on first access. You can modify this warning by setting the
datanucleus.appengine.ignorableMetaDataBehavior property in your config. A
value of NONE will silence the warning. A value of ERROR will turn the warning
into an exception.
Original issue reported on code.google.com by shaun.cl...@a-cti.com on 24 Apr 2013 at 6:48
Original issue reported on code.google.com by
shaun.cl...@a-cti.comon 24 Apr 2013 at 6:48Attachments: