JPA EntityExistsException -


the problem i'm facing following:

exception in thread "main" javax.persistence.entityexistsexception: different object same identifier value associated session: [de.entities.genre#28] @ org.hibernate.ejb.abstractentitymanagerimpl.convert(abstractentitymanagerimpl.java:1359) @ org.hibernate.ejb.abstractentitymanagerimpl.convert(abstractentitymanagerimpl.java:1310) @ org.hibernate.ejb.abstractentitymanagerimpl.convert(abstractentitymanagerimpl.java:1316) @ org.hibernate.ejb.abstractentitymanagerimpl.persist(abstractentitymanagerimpl.java:881) @ de.model.databasebuilder.importdata(databasebuilder.java:87) @ de.main.main.main(main.java:55)

so exception tells me want insert 2 different objects same primary key id.

all datas want insert database using jpa coming xml file. parse file saxparser. of course there many genre entries id 28 because many movies have same genre.

if use auto-generated ids, data wont correct anymore because id's correctly given xml file.

how can solve problem? why isn't jpa not ignoring fact, object present in database , inserting ids of movies , genres in m:n table?

either directly calling persist on genre instances, or calling persist on movie , movie->genre mapping has cascade persist. jpa requires providers throw exception when persist called on detached entity, since persist means want provider insert it, , detached because exists. exception. sounds parser not able tell genre entities same instance, , creating multiple instances of same data. if cannot fixed, might try using merge instead. merge check first if entity instance new or detached. if new, insert, while if detached, retrieve data , update in database.

other options make sure not calling persist on detached genre instances. remove cascade persist settings on relationships, , ensure manually call persist or merge on new genre instances rather rely on cascade persist settings.


Comments

Post a Comment

Popular posts from this blog

linux - xterm copying to CLIPBOARD using copy-selection causes automatic updating of CLIPBOARD upon mouse selection -

i've tried various ways coerce xterm (versions 285 , 292) copy selection clipboard clipboard whenever press ctrl-shift-c. promising way far has been, in ~/.xresources, put this: xterm*vt100.translations: #override \ ctrl shift <keypress> c: copy-selection(clipboard) \n\ ctrl shift <keypress> v: insert-selection(clipboard) ctrl-shift-v works perfectly, copying has nuance... if restart xterm, highlighting text puts things in primary clipboard; expected, proper, default behavior. if hit ctrl-shift-c, copies current selection clipboard clipboard. the bug, however, if highlight text after first time pressed ctrl-shift-c, you'll see highlighting copies both primary and clipboard. cannot figure out how stop xterm updating clipboard upon selection... , doesn't make sense me in first place. i said, @ specific point in time, copy selection clipboard... yet starts updating automatically upon selection after doing once... anyone have workaround...
Read more

c++ - qgraphicsview horizontal scrolling always has a vertical delta -

Image
i've subclassed qgraphicsview custom canvas used in cad application. i've reimplemented qgraphicsview::wheelevent check keyboard modifiers control key and, if control key pressed, zoom. i'm trying implement horizontal scroll when user holds shift , uses wheel. the problem i'm having horizontal scrolling always scrolls 0.279. not huge problem, hugely annoying , points else being wrong. so, here questions: is right way implement horizontal scrolling? if not, is? how eliminate delta of 0.279? thanks in advance. code , sample output below void myview::zoom(int delta) { double factor = pow(1.2, delta/abs(delta)); this->scale(factor, factor); } void myview::scrollhorizontal(int level) { qpointf center = maptoscene(viewport()->rect().center()); qdebug() << "center: " << center.x() << ", " << center.y(); centeron(qpointf(center.x() - level, center.y())); } void myview::wheelevent(qwheeleve...
Read more