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Searching lists within objects

want to search using cb.isMember passing an object. This however does NOT work. I'm uncertain ... you can only match isMember if you have a database object. This does not help as I'm never going to have the real object at search time. Trying to use join is problematic as for every extra attribute I

collection of embedded objects

1. In general, are there any restrictions of the use of @Embedded objects in collections, compared to @Entity? 2. If you have a large nested collection of @Embedded objects, and you remove the parent ... of @Embedded objects more expensive (time) than searching through collections of @Entity? Thanks

2.7.3_03 Erroneous "Attempt to modify a primary key of a managed object"

key of a managed object", but my application is not trying to change the primary key. (ObjectDB log ... . You can still use StringIdentity to represent object IDs externally when a combination of class ... to save/restore the object into/out of the database. Another user might try to navigate and enter

Object comparation never matches

Hi! I'm trying to compare 2 identical objects in SELECT with no success: @Embeddable public ... ; Which is a part of Customer object: @MappedSuperclass @NamedQueries({     @NamedQuery(         name="authentication ... "     ) }) public abstract class Customer implements Serializable {     Object principal; The entity

How to access database object to my application.

Hi, I want to access a object which contains some value like id,name,college and address. Here it returns some address but i am not getting object value, i attach 3 java program below, please check. 1: GetterSetter method 2: Creating object for insert data 3: For Access data. Here object created

how to operate with same object but two different Thread on database.

Hi, i have two thread one is for insert data another is for update data but in same object and same ... object of Gettersettetclass, i.e insert operation and pass that object to update.java class. Update ... that object here which is passes from insert.java class.Then here i want to do update operation

object creation during pmf.getPersistenceManager()

Hi We have observed that during pmf.getPersistenceManager(), objectdb is creating object instances ... that transaction we will create instances for all classes. The number of objects created during this invocation is really huge, that causes OutOfMemory during commit (memory for jvm 1,4GB). The object

removed objects stay with null field values in the reference

We have a class with a one to many relationship declared like this (1 or more objects of the same ... <ObjectNode>(); When we remove an object that is in this relationship (workflow), the object stays in ... is when we delete with a query use entityManager.remove hgzwicker Hans-Georg Zwicker You have to remove the object

each 1-2 days objects on some objectdb level lock/block each other

queries without any object manipulation in these threads hgzwicker Hans-Georg Zwicker ... [0x000000007d76e000] java.lang.Thread.State: BLOCKED (on object monitor) at com.objectdb.o.PGC.p(PGC.java:256) - waiting to lock <0x0000000081367f88> (a java.lang.Object) at com.objectdb.o.SNP.u(SNP.java

Explorer bug ? Objects seem to be missing from database in Class view, but are present as references

. When the project runs it logs creation of objects. Please note that there are 2 Project objects, and note that every Element object (except Project itself) gets a Project reference on construction: INFO ... ) We see that 2 Project objects were created, however in the database Explorer it lists size=0 for Project class

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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