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Null returned by Persistence.createEntityManagerFactory

. The exception is ultimately caused by a null pointer on the line "em = emf.createEntityManager()" in ... inaccurate. Try to change your code by moving suspected lines to separate methods, etc. support Support

Getting java.lang.ArithmeticException: / by zero

() is throwing the following exception ava.lang.ArithmeticException: / by zero at com.objectdb.td.remove(td ... which is being used is 2302. Regards, Binit Bhaskar binitbhaskar Binit Bhaskar This division by zero

a second mapping-file is ignored in persistence.xml by enhancer

> We start the enhancer and the entities of orm.xml will be enhanced by following output: enhancer ... will be enhanced by following output, because the enhancer is apparently ignored the ormreq.xml

find out if an entity is refered by other entities

Hello, it is possible to find out if a child entity is just referenced by other parent entity types. But the types of the parent entities are unknown. Is there a possibility to find out if an entity is referenced? best regards btc_es BTC EmbeddedSystems You can only find it (using a query

java.sql.Time field off by 30 minutes

premium and jdk6. rwaters Richard I see the problem on my machine now by running #6 with -Duser.timezone

Query by array element

the array access operation and then use that method in the query. It is supported by ObjectDB

Get multiple entities by Id

I'm trying to fetch a list of entities, by their Id. I Use this query: SELECT c FROM User c WHERE c.id IN :ids This querey works as long as I don't set the property "id" as @Id. If i set @Id to any other member, this query works, if I set id as @Id, it stops working and gives zero results

Internal ObjectDB error by read the primary key

that was not covered by the fix of 2.6.6_05. Build 2.6.6_06 should fix it. Unfortunately

Retrieval by Access bug?

any reason for that. Could be any bug in ObjectDB when I retrieve by navigation a field from


[] fetchGroups The fetch groups in this fetch plan. The fetch groups in this fetch plan. Returns: the fetch groups Default value: {} Since: JDO 2.1 int fetchSize The number of instances of multi-valued fields retrieved by queries. The number of instances of multi-valued fields retrieved by queries

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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