I am having problems with a list with one of my projects, and it is really starting to annoy me. I have tried searching the forums, but have come accross nothing.
Any help will be really appreciated.
The context is that I have a user object, which I want to record timestamped events against. I have it working so that it will retrieve items from the database, but when I add a new event and saveOrUpdate() on the user class the list does not get saved.
I have run a debug on it and can see that the list that is being initialised from the db is a Hibernate PersistentList. I get a class cast exception if I try to cast it to an ArrayList. If I add an item to the list, it does appear to be added, it just wont save.
I have been bashing my head against my monitor for days, I am sure I am missing something simple.
Cheers,
Simon
JRE: jdk1.6.0_06
Server: Tomcat 5.5.26
Hibernate version: 3.2.5
JDBC driver: mysql-connector-java-5.1.5
Framework: Struts 1.2.9
User object:
Code:
public class User {
private long id;
private String username;
private Long version;
private List<Event> events = new ArrayList();
....
public void setEvents(List<Event> events) {
this.events = events;
}
public List getEvents() {
return this.events;
}
public void addEvent(Event event) {
log.info("Adding event: "+event.toString());
this.events.add(event);
}
}
Event object
Code:
public class Event {
private Date time;
private String description;
public Event(String description) {
this.setTime(new Date());
this.setDescription(description);
}
public void setTime(Date time) {
this.time = time;
}
public Date getTime() {
return this.time;
}
public void setDescription(String description) {
this.description = description;
}
public String getDescription() {
return this.description;
}
@Override
public String toString() {
return "[" + this.time.toString() + "] " + this.description;
}
}
Mapping document
Code:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="User" table="user">
<id column="userid" name="id" type="long">
<generator class="native"/>
</id>
<version column="version" name="version" type="long"/>
<!-- STANDARD PROPERTIES -->
<property name="username"/>
<!-- DO THE EVENTS -->
<list cascade="all-delete-orphan" inverse="true" name="events" table="events">
<key column="event_id" not-null="true"/>
<index column="list_position"/>
<composite-element class="Event">
<property name="description"/>
<property name="time" type="java.util.Date" />
</composite-element>
</list>
</class>
</hibernate-mapping>
This is from my logs
Code:
11-09 16:53:52 DEBUG [LoadContexts.java:183] creating collection wrapper:[User.events#3]
...
11-09 16:53:53 INFO [ User.java:127] Adding event: [Thu Sep 11 16:53:53 BST 2008] User identified themselves
11-09 16:53:53 INFO [ UserDAO.java:44] Saving user
11-09 16:53:53 DEBUG [ThreadLocalSessionContext.java:300] allowing proxied method [saveOrUpdate] to proceed to real session
11-09 16:53:53 DEBUG [AbstractSaveEventListener.java:488] persistent instance of: User
11-09 16:53:53 DEBUG [DefaultSaveOrUpdateEventListener.java:99] ignoring persistent instance
11-09 16:53:53 DEBUG [DefaultSaveOrUpdateEventListener.java:136] object already associated with session: [User#3]
11-09 16:53:53 INFO [HibernateSessionFilter.java:53] Committing the transaction
11-09 16:53:53 DEBUG [ThreadLocalSessionContext.java:300] allowing proxied method [getTransaction] to proceed to real session
11-09 16:53:53 DEBUG [ThreadLocalSessionContext.java:300] allowing proxied method [getTransaction] to proceed to real session
11-09 16:53:53 DEBUG [JDBCTransaction.java:103] commit
11-09 16:53:53 DEBUG [SessionImpl.java:337] automatically flushing session
11-09 16:53:53 DEBUG [AbstractFlushingEventListener.java:58] flushing session
11-09 16:53:53 DEBUG [AbstractFlushingEventListener.java:111] processing flush-time cascades
11-09 16:53:53 DEBUG [ Cascade.java:115] processing cascade ACTION_SAVE_UPDATE for: User
...
11-09 16:53:53 DEBUG [ Cascade.java:291] cascade ACTION_SAVE_UPDATE for collection: User.events
11-09 16:53:53 DEBUG [ Cascade.java:306] done cascade ACTION_SAVE_UPDATE for collection: User.events
...
11-09 16:53:53 DEBUG [AbstractFlushingEventListener.java:154] dirty checking collections
11-09 16:53:53 DEBUG [CollectionEntry.java:177] Collection dirty: [User.events#3]
11-09 16:53:53 DEBUG [AbstractFlushingEventListener.java:171] Flushing entities and processing referenced collections
11-09 16:53:53 DEBUG [DefaultFlushEntityEventListener.java:236] Updating entity: [User#3]
11-09 16:53:53 DEBUG [Versioning.java:110] Incrementing: 6 to 7
...
11-09 16:53:53 DEBUG [AbstractFlushingEventListener.java:210] Processing unreferenced collections
11-09 16:53:53 DEBUG [AbstractFlushingEventListener.java:224] Scheduling collection removes/(re)creates/updates
11-09 16:53:53 DEBUG [AbstractFlushingEventListener.java:85] Flushed: 0 insertions, 1 updates, 0 deletions to 1 objects
11-09 16:53:53 DEBUG [AbstractFlushingEventListener.java:91] Flushed: 0 (re)creations, 1 updates, 0 removals to 2 collections
11-09 16:53:53 DEBUG [ Printer.java:83] listing entities:
11-09 16:53:53 DEBUG [ Printer.java:90] User{id=3, username=sy50, events=<uninitialized>, version=6}
11-09 16:53:53 DEBUG [AbstractFlushingEventListener.java:290] executing flush
11-09 16:53:53 DEBUG [ConnectionManager.java:469] registering flush begin
11-09 16:53:53 DEBUG [AbstractEntityPersister.java:2339] Updating entity: [User#3]
11-09 16:53:53 DEBUG [AbstractEntityPersister.java:2341] Existing version: 6 -> New version: 7
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