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without entity classes in the classpath but the metamodel is empty. How does your explorer get to metamodel

Should derived fields of an EmbeddedId be manually maintained by app code?

; @Basic protected java.lang.Integer lastInstanceInMap; protected EContainer() { // Empty

Mapped (Inverse) LAZY @OneToMany vs. Unmapped LAZY @OneToMany

list gives null and the unmapped list gives an empty list [], when DO_VIEW_BEFORE_CLOSE = false. webel

Can't get arraylist/vector type attributes

the Vector dissapears and I get an empty vector. Something weird happens, if BEFORE closing

Fetching Collections Puzzle

empty - but as soon as your application accesses its content (e.g. by invocation of the size method

Type xxx is not found (error 301)

The error: Type User is not found (error 301) occurs when I query the db for a type before any instances of that type have been persisted, e.g.: return em.createQuery ("SELECT a FROM User a").getResultList (); What I was expecting was an empty list, not an error. Is there some enhancement

JPA - ExceptionInInitializerError when creating EntityManager

(); } //Empty Constructor public void Main() { } public static void main(String[] args

can't get HashMap out of the database

I'm trying to persist an Entity containing a HashMap. It stores the data in the database OK, but the map is always empty when I get the entity out of the database again. I've reproduced this problem in a simple variation of the Guestbook tutorial: Guest class: ===================== @Entity

type.loader java.lang.ClassNotFoundException

- so please check if you still see these exceptions in lower logging level (e.g. info). The empty

Problem with JOIN and inheritance

Hello, Please run this query on the attached DB: SELECT DISTINCT $1 FROM com.quasado.serviceplaza.customer.VendorCustomer $1 JOIN $1.qubletFRAGMENTMAP $2, com.quasado.foundation.warehouse.contract.customer.CustomerContractsFragment $3 WHERE ((NOT (($2=$3) AND ($3.contracts IS EMPTY

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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