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Sample JDO Architecture for Follow Up Questions

I am trying to finalize on my application's JDO and ObjectDB archieture.  I have done documentation survey (reading JDO books, studying ObjectDB's documents and forum) and have designed what I think is the best architecture for my particular application usage model. #1 2016-07-25 15:26 I am trying to finalize on my application's JDO and ObjectDB archieture.  I have done documentation surv ...

 
manual

Database Schema Evolution

Explains how ObjectDB handles automatically schema changes. Modifications to entity classes that do not change their persistent field definitions (their schema) are transparent to ObjectDB. This includes adding, removing and modifying constructors, methods and non persistent fields. However, additions, deleti ...

 
forum_thread

ClassCastException of same object type

I have ObjectDB partially working with my project. At the moment it seems to be saving objects and retrieving objects ok in the main project. However, when I make a plugin for the project, the new objects are persisted but not retrieved. I get the following error: java.lang.ClassCastException: org.sportscoring.ssv.xc.core.XCCompetitorCount cannot be cast to org.sportscoring.ssv.xc.core.XCCompetitorCount ... When the query is run, debugging shows that "list" contains the XCCompetitorCount objects I persisted earlier. The ... if (!this.XCCompetitorCounts.contains(obj)) { ...

 
release

2.3.7

Release date: 2012-02-06 Download (5.38 MB) Binary:  objectdb-2.3.7.zip You should start by following a  tutorial or reading the manual ...

 
manual

Database Replication and Clustering

Replication enables maintaining up to date version of an ObjectDB database on multiple nodes.... ) ; A composite url contains two or more database urls separated by '|' . Usually only ...

 
issue

Error reading UTF string (Serialized Objects in Explorer)

This is the message I get for attached db and this query: ... you may try running the Explorer with a classpath that contains all your classes. But if Money is serializable and ...

 
forum_thread

Listing large number of complicated objects with paging.

Hi, For last few hours I was working on a problem with bad performance and memory problems with such a simple query: select prod from Product prod order by prod.id ASC Right now I have 55541 'Product' (attached to this post) entities in database and I'm trying to speed listing them with paging. The problem is, that running code that looks like this: ... I was trying to build wrapper object ProductTO that contains only fields that I need in listing and the use new ProductTO() in ...

 
release

2.3.6

Release date: 2012-01-09 Download (5.38 MB) Binary:  objectdb-2.3.6.zip You should start by following a  tutorial or reading the manual ...

 
forum_thread

Navigation to Collection Elements

Greetings ObjectDB team, Suppose I have a collection typed field (list/map/set...) in my persistent object of class X. Can I navigate (as oppose to using JOIN) to individual elements (in JPA & JDO) ? e.g.: x.list.get(10) x.map.get("key") x.list.get(10).get("key") // the element itself is a map Thanks & Best Regards... expressions (by using JPA's JOIN or JDO's contains). The array expressions that you wrote are not supported in ...

 
manual

ORDER BY clause (JPQL / Criteria API)

Explains how to use the ORDER BY clause in a JPA/JPQL query.... always the last in the query processing chain. If a query contains both an ORDER BY clause and a GROUP BY clause the SELECT clause ...