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Soft Reference Object Cache Recommendation

limit being exceeded before the post attempt. =( ) I desire to have my persistent objects be cached ... for my application. This would use a Least Recently Used (LRU) mechanism to get rid of older objects ... [] and instruct ObjectDB to use soft reference for its Level One (L1) object data cache. I disable the L2 cache

Speed of queries that return many objects

objects is more than you may expect and much slower than just reading the data from the disk. Using embedded objects or report queries (which return fields rather than entity objects) may help ... , this may not help if you need all the objects in memory at once. support Support Thanks, the problem is that I

Entity listener - event instead of object

in updated entity. There is a problem however with accessing "old" version of object stored in ... @ElementCollection private Set<ActivityLog> activities; This way I can add events to given object without using EM to persist new object. What I want to accomplish is to log difference between new and old values

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

Time Sequence Object Command DB

We (www.s2ssystems.com) have a time-sequential object command database. I would like ... ) are create object, change object (fields), delete object, and object-method execution commands. Method commands are generally used to trigger creation of transient objects. The database can be branched

UserException - Object User#2 belongs to another EntityManager

CDI. Problem on method execution, which runs a NamedQuery: com.objectdb.o.UserException - Object 'com ... Chirac This exception is thrown only when mixing entity objects of different entity managers (which is forbidden, since every EntityManager manages its own space of managed objects, and a managed object

OutofMemory error with Object DB 2.0

after persisting 200 records and then the same transaction object from the same PersistentManager ... of the application it will show what objects fill the heap. But one possible reason ... , new objects are not released on commit automatically. This could be solved by calling JPA's clear or

GWT RPC is throwing serialization exception when I have object db date value

its Class object could not be loaded. For security purposes, this type will not be serialized.: instance ... for all of mine Data Transfer Object. But still I am getting this error. Note: (In gwt RPC you cannot use the Entity objects, You need srializable DTO objects to handle CRUD operations). kpanda ganesh gothai

FROM clause (JPQL / Criteria API)

The FROM clause declares query identification variables that represent iteration over objects in ... a program, since both are used for iteration over objects. Range Variables Range variables are query identification variables that iterate over all the database objects of a specific entity class

new objects not available in mappedBy associations

> employees; creating a new mapped class, e.g. new Employee, won't result in this object being available in the same transaction: ie: for (Employee e : department.employee) won't include the new object ... automatically when the object is retrieved from the database again. Try to refresh the department object

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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