jpa - JSF + Hyperjaxb3 + Hibernate LazyInitializationException accross requests -

-

i have jsf application trinidad components , jaxb/jpa entity beans generated hyperjaxb3. in ui use trinidad combo box component has jpa object values.

the scenario is:

  1. user make selection in combo box
  2. user clicks on control sends request server , returned same form
  3. data form submitted , selection in combo box should user did in step 1. equals() method called on combo box items (jpa objects) , exception thrown:

org.hibernate.lazyinitializationexception: failed lazily initialize collection of role: package.anobject.items, no session or session closed @ org.hibernate.collection.abstractpersistentcollection.throwlazyinitializationexception(abstractpersistentcollection.java:358) @ org.hibernate.collection.abstractpersistentcollection.throwlazyinitializationexceptionifnotconnected(abstractpersistentcollection.java:350)

 @ org.hibernate.collection.abstractpersistentcollection.readsize(abstractpersistentcollection.java:97)   @ org.hibernate.collection.persistentbag.size(persistentbag.java:225)   @ org.jvnet.hyperjaxb3.item.abstractitemlist.size(abstractitemlist.java:51)   @ java.util.abstractlist$itr.hasnext(unknown source)   @ org.jvnet.jaxb2_commons.lang.builder.jaxbequalsbuilder.append(jaxbequalsbuilder.java:57)   @ org.jvnet.jaxb2_commons.lang.builder.jaxbequalsbuilder.append(jaxbequalsbuilder.java:29)   @ package.anobject.equals(anobject.java:177)   @ org.jvnet.jaxb2_commons.lang.builder.jaxbequalsbuilder.append(jaxbequalsbuilder.java:34)   @ package.parentobject.equals(parentobject.java:532)   @ package.parentobject.equals(parentobject.java:551)   @ java.util.arraylist.indexof(unknown source)   @ org.apache.myfaces.trinidad.component.uixselectmany._destructivecompareoutoforderlists(uixselectmany.java:179)   @ org.apache.myfaces.trinidad.component.uixselectmany.comparevalues(uixselectmany.java:139)   @ org.apache.myfaces.trinidad.component.uixeditablevalue.validate(uixeditablevalue.java:180)   @ org.apache.myfaces.trinidad.component.uixeditablevalue._executevalidate(uixeditablevalue.java:503)   @ org.apache.myfaces.trinidad.component.uixeditablevalue.processvalidators(uixeditablevalue.java:270)   @ javax.faces.component.uicomponentbase.processvalidators(uicomponentbase.java:1058)   @ javax.faces.component.uicomponentbase.processvalidators(uicomponentbase.java:1058)

i use openentitymanagerinviewfilter spring lazy loaded objects - works in 1 request.

on level of hyperjaxb generated object equals() method calls equals(object object, equalsbuilder equalsbuilder) method equalsbuilder.append(...) called on each attribute of object. when attribute list proxied persistenbag , point lazyinitializationexception.

equals() method - generated hyperjaxb:

public boolean equals(object object) {     if (!(object instanceof parentobject)) {         return false;     }     if (this == object) {         return true;     }     final equalsbuilder equalsbuilder = new jaxbequalsbuilder();     equals(object, equalsbuilder);     return equalsbuilder.isequals(); }

equals(object object, equalsbuilder equalsbuilder) generated hyperjaxb:

public void equals(object object, equalsbuilder equalsbuilder) {     if (!(object instanceof parentobject)) {         equalsbuilder.appendsuper(false);         return ;     }     if (this == object) {         return ;     }     final parentobjectthat = ((parentobject) object);     // persitentbag, lazyinitializationexception thrown here     equalsbuilder.append(this.getanobject(), that.getanobject());     equalsbuilder.append(this.get..., that.get...);     ... }

do guys have ideas how fix problem?

i tried use jsf converter , have selectitem string value (not object) if remember right equals() called after string converted object.

you because objects not detached (1) , access data (2) outside session (3). correct, should address (1-3) in combination.

  1. detach objects. easiest, it's no lazy loading.
  2. make sure session available. you're using oemiv pattern - how comes session isn't there when equals method called? believe it's because equals called not during view rendering in other jsf phases. can try extend oemiv pattern make span on whole jsf lifecycle.
  3. don't access data. equals(...) , hashcode(...) methods recommended, not required. can disable generation in hj3, can exclude properties hashcode()/equals(...) building, can use own equals , hashcode strategies - plenty of ways achieve this.

me personally, i'd check first, why session not there.


Comments

Post a Comment

Popular posts from this blog

c++ - Convert big endian to little endian when reading from a binary file -

-
this question has answer here: how convert between big-endian , little-endian values in c++? 28 answers i've been looking around how convert big-endian little-endians. didn't find solve problem. seem there's many way can conversion. anyway following code works ok in big-endian system. how should write conversion function work on little-endian system well? this homework, since systems @ school running big-endian system. it's got curious , wanted make work on home computer also #include <iostream> #include <fstream> using namespace std; int main() { ifstream file; file.open("file.bin", ios::in | ios::binary); if(!file) cerr << "not able read" << endl; else { cout << "opened" << endl; int i_var; double d_var; while(!file.eof()) {...
Read more

C#: Application without a window or taskbar item (background app) that can still use Console.WriteLine() -

-
i'm trying create application adheres following: no taskbar no console or form window can utilize console.writeline() . (i.e. if executes app command prompt write console.) the problem if create windows form (or wpf) application can have there no taskbar, console or window show up, console.writeline() nothing. if create console app, writes console, can't figure out how hide (and if did hide it, write command prompt window?)... how do this? just create standard console application. callers responsibility hide window caused program (from how run c# console application console hidden ): system.diagnostics.processstartinfo start = new system.diagnostics.processstartinfo(); start.filename = dir + @"\myprocesstostart.exe"; start.windowstyle = system.diagnostics.processwindowstyle.hidden;
Read more

unicode - Are email addresses allowed to contain non-alphanumeric characters? -

-
i'm building website using `django. website have significant users non-english speaking countries. i want know if there technical restrictions on types of characters email address contain. are email addresses allowed contain english alphabets, numbers, "_", "@" , "."? are allowed contain non-english alphabets "é" or "ü"? are allowed contain chinese or japanese or other unicode characters? email address consists of 2 parts local before @ , domain goes after. rules these parts different: for local part can use ascii: latin letters - z - z digits 0 - 9 special characters !#$%&'*+-/=?^_`{|}~ dot ., not first or last, , not in sequence space , "(),:;<>@[] characters allowed restrictions (they allowed inside quoted string, backslash or double-quote must preceded backslash) plus since 2012 can use international characters above u+007f , encoded as utf-8 . domain part more res...
Read more