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forum_thread

Problem persisting a TreeSet field

Hello, I am getting a "java.lang.IllegalArgumentException: Can not set java.util.TreeSet field Message.children to java.util.HashSet" when persisting a Message object with a parent/children relationship: @ManyToOne private Message parent; @OneToMany(mappedBy = "parent") private TreeSet<Message> children; Seems that objectdb is converting TreeSet into HashSet? Why? http://www.objectdb.com/java/jpa/entity/types says TreeSet is supported... ... ordinary persistent field instead of as an inverse field - remove he mappedBy setting, and update the TreeSet explicitly - ObjectDB ...

 
forum_thread

Usage of Inherited Class

Hi, I found a problem in ObjectDB which may be incompatible with EclipseLink and JPA. Here's the codes: // Nodes.java ... 01:14 Ok, I remove the tedious codes. After putting 10 nodes2 + 10 nodes1 + 10 nodes, 30 ...

 
forum_thread

Performance in SELECT statement

Hello, I have the following 2 entities : ... this query tooks so long. edit: I just tried to remove the second entity completely and integrate its 3 variables directly in ...

 
forum_thread

Several parallel threads to speed up query on one DB

Hi, I have an application: producer (from a DB) to a consumer. The current bottleneck is the producer from DB (based on a query) and I would like to speed it up. I have tried using several entity managers (same DB instance) to benefit from the parallelisation - but it looks like I don't get much benefit from doing that.  #1 2015-01-25 13:57 Hi, I have an application: producer (from a DB) to a consumer. The current bottleneck is the prod ...

 
forum_thread

Uninitialized primary key (id = 0)

Exception in thread "main" [ObjectDB 2.2.9_04] javax.persistence.RollbackException Failed to commit transaction: Attempt to reuse an existing primary key value (image.Meta:0) (error 613) at com.objectdb.jpa.EMImpl.commit(EMImpl.java:277) I check the db by explorer.jar, and find the only one record is id=0. What situation will be id=0? TIA ... Should I remove the whole db? TIA Institute of Computer ...

 
forum_thread

Problem with @OrderBy

When I use @OrderBy and supply multiple order fields I get and error when ObjectDB loads that entity. Example code: @Entity @Table(name="Problems", schema = myDB") public class Defects  implements Serializable { ... ...  @OneToMany(mappedBy="problem") @OrderBy("seqRel, noteSeq") Set<Notes> notes; ... ... } ... an entity instead of a field of an entity. If I remove the multiple fields and only use one I do not get any errors. @ ...

 
forum_thread

ObjectDB Explorer Exposes Username and Password

How can I prevent my database username and password from being exposed by ObjectDB Explorer? ... If I understand correctly, if someone were to remove the configuration file, the username and password would again be ...

 
api-jpa

having(restrictions)

Specify restrictions over the groups of the query according the conjunction of the specified restriction predicates.(Method of javax.persistence.criteria.CriteriaQuery)

 
forum_thread

Like fails if both underscore and percent are used

When using a like query that has both _ and % in it, ObjectDB seems to fail. Here is a unit test to demonstrate:   ... ) ) { em. remove ( item ) ; } em. ...

 
forum_thread

Problem to use find method on an abstract Class: AbstractMethodError is thrown

Hi, I'm using JBoss AS 7 WildFly with ObjectDB installed as a module ( also Java 7, Eclipse Juno) In my db there are objects of type SentenceStatement which inherit from type LogicalObject  When I use find method mentioning SentenceStatement everything works just fine but when I use this method mentioning LogicalObject I get AbstractMethodError Please see services.Tester class with the 2 options for a better ease    this is the stack trace when I try to find LogicalObject: #1 2013-10-26 00:17 Hi, I'm using JBoss AS 7 WildFly with ObjectDB installed as a module ( also Java 7, Eclipse Juno) ...