Hi all, I am working with Jboss 5 beta 4, JPA und the HSQL Database. This is my JoinTable definition in class Subscription: @ManyToMany(targetEntity=com.sap.sii.pubsub.entity.Subscriber.class, fetch = FetchType.EAGER) | @JoinTable(name = "SII_PUBSUB_SUBSCRIPTION_SUBSCRIBER", | joinColumns = @JoinColumn(name = "SUBSCRIPTION_ID", referencedColumnName = "SUBSCRIPTION_ID"), | inverseJoinColumns = @JoinColumn(name = "SUBSCRIBER_ID", referencedColumnName = "SUBSCRIBER_ID")) | public ArrayList<Subscriber> getSubscribers() { | return subscribers; | } The other side in class Subscriber:@ManyToMany(targetEntity=com.sap.sii.pubsub.entity.Subscription.class, fetch=FetchType.EAGER, mappedBy="subscribers") | public ArrayList<Subscription> getSubscriptions() { | return subscriptions; | } And there is the table SII_PUBSUB_SUBSCRIPTION_SUBSCRIBER with the columns SUBSCRIPTION_ID andSUBSCRIBER_ID. But when I persist the entity this table is empty but there is are the columnssubscriptions and subscribers with some data looking like object references:([B@7f8124) in the tables of subscription and subscriber. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4147860#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...