Featured post

c# - Usage of Server Side Controls in MVC Frame work -

-
i using asp.net 4.0 , mvc 2.0 web application. project requiremrnt have use server side control in application not possibl in noraml case. ideally want use adrotator control , datalist control. i saw few samples , references in codepleax mvc controllib howwver found less useful. can tell how utilize theese controls in asp.net application along mvc. note: please provide functionalities related adrotator , datalist controls not equivalent functionalities thanks in advace. mvc pages not use normal .net solution makes use of normal .net components impossible. a normal .net page use event driven solution call different methods service side mvc use actions , view completly different way handle things. also, mvc not use viewstate normal .net controlls require. found article discussing mixing of normal .net , mvc.
3 comments

jpa 2.0 - JPA 2 Criteria API - Exception converting JPQL to Criteria API query with Eclipselink -

-

i'm having trouble converting jpa query use criteria api

i have following query attempts find serviceuser matching passed address parameter. serviceuser abstract entity concrete subclasses child , adult. i'm using joined inheritance strategy on serviceuser class.

everything works fine when call method.

public set<t> findbyaddress(address address) {      query query = manager.createquery("select distinct s serviceuser s join s.addresshistory h h = :address");     query.setparameter("address", address);      hashset<t> result = new hashset<t>();     (object s : query.getresultlist()) {         // tclass runtime type of generic session bean.         if (this.tclass.isinstance(s)) {             result.add((t) s);         }     }       return result; }

but, if try replace function following uses generated metamodel , typedquery getting exception

public set<t> findbyaddress(address address) {      criteriabuilder cb = manager.getcriteriabuilder();     criteriaquery<serviceuser> cq = cb.createquery(serviceuser.class);     root<serviceuser> su = cq.from(serviceuser.class);      join<serviceuser, address> addresshistory = su.join(serviceuser_.addresshistory);     cq.select(su).distinct(true).where(cb.equal(addresshistory, cb.parameter(address.class, "address")));     typedquery<serviceuser> q = manager.createquery(cq);     q.setparameter("address", address);      hashset<t> result = new hashset<t>();     (serviceuser s : q.getresultlist()) {         // tclass runtime type of generic session bean.         if (this.tclass.isinstance(s)) {             result.add((t) s);         }     }      return result; }

here stacktrace eclipslink logging. there seems nulpointerexception being thrown i'm not sure why?

 /** test : shouldbeabletofindchildbyaddress() uk.gov.sunderland.ccms.model.bean.childservice.findbyaddress(address[id=1,lineone=7,linetwo=camberwell way,linethree=moorside,linefour=sunderland,postcode=sr7 3xn]) [el finer]: 2010-12-20 12:39:42.89--serversession(7055953)--thread(thread[pool-52-thread-1,5,grizzly-kernel])--client acquired [el finer]: 2010-12-20 12:39:42.89--unitofwork(22763294)--thread(thread[pool-52-thread-1,5,grizzly-kernel])--tx binding tx mgr, status=status_active [el finest]: 2010-12-20 12:39:42.89--unitofwork(22763294)--thread(thread[pool-52-thread-1,5,grizzly-kernel])--execute query readobjectquery(referenceclass=address sql="select id, line_two, line_three, line_one, line_four, postcode address (id = ?)") [el finest]: 2010-12-20 12:39:42.906--unitofwork(22763294)--thread(thread[pool-52-thread-1,5,grizzly-kernel])--execute query readallquery(referenceclass=serviceuser ) [el finest]: 2010-12-20 12:39:42.906--serversession(7055953)--thread(thread[pool-52-thread-1,5,grizzly-kernel])--reconnecting external connection pool [el fine]: 2010-12-20 12:39:42.906--serversession(7055953)--connection(32184426)--thread(thread[pool-52-thread-1,5,grizzly-kernel])--select distinct t2.service_user_type address t0, service_user t2, service_user_address t1 ((? = t0.id) , ((t1.service_user_id = t2.id) , (t0.id = t1.address_id)))         bind => [1] [el finer]: 2010-12-20 12:39:42.906--unitofwork(22763294)--thread(thread[pool-52-thread-1,5,grizzly-kernel])--class uk.gov.sunderland.ccms.model.entity.adult [el finest]: 2010-12-20 12:39:42.906--serversession(7055953)--thread(thread[pool-52-thread-1,5,grizzly-kernel])--reconnecting external connection pool [el fine]: 2010-12-20 12:39:42.906--serversession(7055953)--connection(29495316)--thread(thread[pool-52-thread-1,5,grizzly-kernel])--select distinct t0.id, t0.service_user_type, t0.title, t0.dob, t0.gender, t0.disability, t0.ethnicity, t1.id, t1.employment, t1.info_pack_required, t1.home_phone, t1.other_language, t1.referrer, t1.mobile_phone, t1.lone_parent, t1.gp_practice, t1.contactable, t1.work_phone, t1.baby_due_date, t1.english_level service_user_address t3, address t2, adult t1, service_user t0 (((? = t2.id) , ((t1.id = t0.id) , (t0.service_user_type = ?))) , ((t3.service_user_id = t0.id) , (t2.id = t3.address_id)))         bind => [1, 1] [el warning]: 2010-12-20 12:39:42.906--unitofwork(22763294)--thread(thread[pool-52-thread-1,5,grizzly-kernel])--java.lang.nullpointerexception         @ org.eclipse.persistence.descriptors.inheritancepolicy.selectallrowusingdefaultmultipletablesubclassread(inheritancepolicy.java:1355)         @ org.eclipse.persistence.descriptors.inheritancepolicy.selectallrowusingmultipletablesubclassread(inheritancepolicy.java:1396)         @ org.eclipse.persistence.internal.queries.expressionquerymechanism.selectallrows(expressionquerymechanism.java:2493)         @ org.eclipse.persistence.queries.readallquery.executeobjectlevelreadquery(readallquery.java:407)         @ org.eclipse.persistence.queries.objectlevelreadquery.executedatabasequery(objectlevelreadquery.java:1074)         @ org.eclipse.persistence.queries.databasequery.execute(databasequery.java:736)         @ org.eclipse.persistence.queries.objectlevelreadquery.execute(objectlevelreadquery.java:1034)         @ org.eclipse.persistence.queries.readallquery.execute(readallquery.java:380)         @ org.eclipse.persistence.queries.objectlevelreadquery.executeinunitofwork(objectlevelreadquery.java:1112)         @ org.eclipse.persistence.internal.sessions.unitofworkimpl.internalexecutequery(unitofworkimpl.java:2909)         @ org.eclipse.persistence.internal.sessions.abstractsession.executequery(abstractsession.java:1291)         @ org.eclipse.persistence.internal.sessions.abstractsession.executequery(abstractsession.java:1273)         @ org.eclipse.persistence.internal.sessions.abstractsession.executequery(abstractsession.java:1247)         @ org.eclipse.persistence.internal.jpa.ejbqueryimpl.executereadquery(ejbqueryimpl.java:479)         @ org.eclipse.persistence.internal.jpa.ejbqueryimpl.getresultlist(ejbqueryimpl.java:714) */

looking @ sql gets issued failing criteria api query , comparing sql gets issued when perform query jpa string query.

criteria query

   select distinct t0.id, t0.service_user_type, t0.title, t0.dob, t0.gender, t0.disability, t0.ethnicity, t1.id, t1.employment, t1.info_pack_required, t1.home_phone, t1.other_language, t1.referrer, t1.mobile_phone, t1.lone_parent, t1.gp_practice, t1.contactable, t1.work_phone, t1.baby_due_date, t1.english_level  service_user_address t3, address t2, adult t1, service_user t0  (((? = t2.id) , ((t1.id = t0.id) , (t0.service_user_type = ?)))  , ((t3.service_user_id = t0.id) , (t2.id = t3.address_id)))

jpa string query

  select distinct t0.id, t0.service_user_type, t0.title, t0.dob, t0.gender, t0.disability, t0.ethnicity, t1.id, t1.employment, t1.info_pack_required, t1.home_phone, t1.other_language, t1.referrer, t1.mobile_phone, t1.lone_parent, t1.gp_practice, t1.contactable, t1.work_phone, t1.baby_due_date, t1.english_level service_user_address t3, address t2, adult t1, service_user t0  (((? = t2.id) , ((t1.id = t0.id) , (t0.service_user_type = ?)))  , ((t3.service_user_id = t0.id) , (t2.id = t3.address_id)))

and

select distinct t0.id, t0.service_user_type, t0.title, t0.dob, t0.gender, t0.disability, t0.ethnicity, t1.id  service_user_address t3, address t2, child t1, service_user t0 (((? = t2.id) , ((t1.id = t0.id) , (t0.service_user_type = ?))) , ((t3.service_user_id = t0.id) , (t2.id = t3.address_id)))

i can see first part deals adult subclass of serviceuser identical in both cases when comes child subclass criteria query throws 

 [el warning]: 2010-12-20 )--java.lang.nullpointerexception         @ org.eclipse.persistence.descriptors.inheritancepolicy.selectallrowusingdefaultmultipletablesubclassread(inheritancepolicy.java:1355)

could bug eclipselink?

yes indeed appears bug eclipselink

 <dependency>      <groupid>org.eclipse.persistence</groupid>      <artifactid>eclipselink</artifactid>      <version>2.1.1</version>      <scope>provided</scope>  </dependency>

changing inheritance strategy 

@inheritance(strategy = inheritancetype.joined)

to

@inheritance(strategy = inheritancetype.single_table)

on abstract base class service_user provides workaround in case ok.


Comments

Post a Comment

Popular posts from this blog

c# - Usage of Server Side Controls in MVC Frame work -

-
i using asp.net 4.0 , mvc 2.0 web application. project requiremrnt have use server side control in application not possibl in noraml case. ideally want use adrotator control , datalist control. i saw few samples , references in codepleax mvc controllib howwver found less useful. can tell how utilize theese controls in asp.net application along mvc. note: please provide functionalities related adrotator , datalist controls not equivalent functionalities thanks in advace. mvc pages not use normal .net solution makes use of normal .net components impossible. a normal .net page use event driven solution call different methods service side mvc use actions , view completly different way handle things. also, mvc not use viewstate normal .net controlls require. found article discussing mixing of normal .net , mvc.
Read more

cocoa - Nesting arrays into NSDictionary object (Objective-C) -

-
i define tasks using nsdictionary, i'd save in plist file (i didn't have luck core data far), got stuck @ 2 points: -- when using initwithobjectsandkeys: can change data type number or boolean, using nsdate's numberwithint: , numberwithbool: methods, respectively. can't seem find method change type date though. couldn't find in documentation. -- second problem ran nested arrays. how can add them dictionary? i have uploaded picture here of trying achieve. thank in advance! do mean nsnumber 's +numberwithint: , +numberwithbool: methods, not nsdate ? it's nsnumber defines methods. to convert number date, depends on number is. if it's unix timestamp, [nsdate datewithtimeintervalsince1970:thetimestampinseconds] . as adding nsarray objects dictionary: [yourdictionary setobject:yourarray forkey:@"somekey"]; you'll have post code if need more question isn't clear.
Read more

ios - Very simple iPhone App crashes on UILabel settext -

-
i have simple application. have button , label in ib. have ibaction onclick calls settext on label. there's outlet label. connected in ib. crashes app first time in simulator. when launch again, sets text. crashes again next time. crashes on actual device. should simple, i'm not sure i'm doing wrong. thanks. in .h file : #import <uikit/uikit.h> @interface untitledviewcontroller : uiviewcontroller { iboutlet uilabel *label; iboutlet uibutton *button; } @property (nonatomic, retain) uilabel *label; -(ibaction) onclick1: (id) sender; @end and in .m: - (ibaction) onclick1: (id) sender { //[label settext:@"hello world!"]; label.text = @"hello world!"; //[button settitle:@"clicked" forstate:uicontrolstatenormal]; } sorry, i'm new site. how crash log , stack? thanks. edit : while answer technically correct, doesn't answer question @ :( sorry < warning - guess > if you're
Read more