Unknown entity: java.util.ArrayList ???

[Joshua Elkino]

Hi,
I've been googling this problem, but i cannot resolve it. I have a DB insert class that will insert initial values to the DB for testing purposes.

private ArrayList<CategoryEnt> categorys = new ArrayList<CategoryEnt>();
 
CategoryEnt medical = new CategoryEnt("Medical");
this.categorys.add(medical);

CategoryEnt business = new CategoryEnt("Business");
this.categorys.add(business);
 
session.save(categorys);

Its crashing at the session save and i have no idea why.

here is my CategoryEnt with the setters not mentioned

private Long id;
private String name;
private Set<AuctionEnt> auctionEnts = new HashSet<AuctionEnt>();
 
public CategoryEnt(String name){this.name = name;
 
@OneToMany(cascade={CascadeType.PERSIST, CascadeType.MERGE})
@Cascade(value = org.hibernate.annotations.CascadeType.SAVE_UPDATE)
public Set<AuctionEnt> getAuctionEnts() {return auctionEnts;}
 
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
public Long getId() {return id;}
 
@Column(nullable = false)
public String getName() {return name;}

I also get this with a few other classes, but this is the simplest so i figured try to fix this first.

Also i was getting a weird error before "Could not determine type for: com.prosper.model.MemberEnt" until i made the class serializable. Do i need to make ALL my classes serializable?
Using hibernate 3.2 w/ mysql 5
Thanks

[Paul Sturrock]

Does MemberEnt represent a composite key? If so this needs to be serializable.

[Joshua Elkino]

I didnt think it did. I am referencing MemberEnt from other classes but every class has an @Id except for the Embeddable classes. What about my initial problem? any suggestions?

[Paul Sturrock]

What exception message do you see?

[Joshua Elkino]

  Rolling back Transaction
org.hibernate.MappingException: Unknown entity: java.util.ArrayList
at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:550)
at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1338)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:98)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:535)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:523)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:519)
at com.prosper.util.InsertDbData.insertCategories(InsertDbData.java:126)
at com.prosper.util.InsertDbData.doInserts(InsertDbData.java:76)
at com.prosper.util.InsertDbData.main(InsertDbData.java:57)
Unknown entity: java.util.ArrayList  

[Jaikiran Pai]

private ArrayList<CategoryEnt> categorys = new ArrayList<CategoryEnt>();
.....
session.save(categorys);

You cannot pass a collection of objects to the session object for persisting. As per the Session javadoc, the save accepts a Object of the persistent class (in your example, the CategoryEnt)