August Detlefsen wrote:
> Hi, I am getting the following error when I try to remove objects from an
> ArrayList:
>
> org.exolab.castor.jdo.TransactionAbortedException:
> Nested error: java.lang.IllegalStateException: Object deleted waiting
> for lock?????????: Object deleted waiting for lock?????????
> at
> org.castor.persist.AbstractTransactionContext.prepare(AbstractTransactionContext.java:1227)
> at
> org.exolab.castor.jdo.engine.LocalDatabaseImpl.commit(LocalDatabaseImpl.java:161)
> at
> com.codemagi.servlets.content.PageController.dispatchSetTeam(PageController.java:1026)
>
> One
> of my mapped objects, Section, contains an ArrayList of Users. When I
> try to remove Users from that list and commit, I get the error. Here is
> the code that causes the error to happen:
>
> Section section = (Section)db.load(Section.class, sectionId);
Given that you have access to all Users associated with a Section
through the getTeamMembers() method of Section, why not iterate through
the list returned and remove User instances from this list as needed ?
Castor - upon commit time - will be able to tell that you have modified
the list of team members, and persist things accordingly.
[I am not 100% sure why your problem is occuring, but you are
essentially loading some User instances more than once, though Castor
should be able to deal with this.}
I hope this helps
Werner
>
> Iterator i = removeIds.iterator();
> while (i.hasNext()) {
> Integer memberId = convertInteger( (String)i.next() );
> IUser memberToRemove = (IUser)db.load(USER_CLASS, memberId);
>
> section.removeUser(memberToRemove); //calls ArrayList.remove(Object)
> }
>
> db.commit();
>
> If
> I log the contents of the List in section, I can see that the User
> objects are getting properly removed. The actual error occurs when
> db.commit() is called.
>
> What causes this error to be thrown?
> How does one properly remove objects from a list? Note that we don't
> actually want to delete the User, we just want to remove it from the
> Section.
>
> Here is the mapping for Section showing a many-many relationship to User (the
> database is MySQL):
>
> <class name="com.codemagi.servlets.content.model.Section" identity="id"
> key-generator="IDENTITY">
> <description>section hierarchy for navigation and
> breadcrumbs</description>
> <map-to table="nav_section" />
> <field name="id" type="integer">
> <sql name="section_id" type="integer"/>
> </field>
> <field name="name" type="string">
> <sql name="section_name" type="varchar"/>
> </field>
> <field name="teamMembers" type="org.openeco.login.model.User"
> collection="arraylist">
> <sql name="user_id" many-table="nav_section_user_xref"
> many-key="section_id" />
> </field>
> </class>
>
> Thanks,
> August
>
> PS: Check out OpenEco. It is a full web application framework that uses
> Castor JDO-XML as its core persistence layer: http://openeco.dev.java.net
>
>
>
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