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81

Is it possible to using JDO and distributed transaction?

I'am new to study JDO. Can and How I use JDO an distributed transaction?(multiple database ... Documentation JCA, JTA, and JDO Transactions - Using and Understanding Java Data Objects JDO : Usage of DataNucleus within a JEE environment btpka3 ZhangLiangLiang ObjectDB supports distributed transactions
81

Query for objects persisted within the same transaction

I have a question concerning reading uncommited entities with query, within active transaction. For example, I read data from file. Each line contains value of one of entity's attributes ... and persisted withing current transaction is invisible to future queries in this transaction, unless
80

remove & persist in same transaction => Attempt to reuse an existing primary key value

transaction: first remove additional Data -> The special Entity (with id 1) is empty and we remove ... an entity object and then in the same transaction persisting another object with the same primary key
80

NegativeArraySizeException on commiting a transaction

Hi, we started to get a java.lang.NegativeArraySizeException from ObjectDB upon changing an object in the DB and committing the transaction. I tried to repair the DB file with Database Doctor ... and since then my changing transactions are working fine on that original object which was failing
79

com.objectdb.o._RollbackException: Failed to commit transaction

Check the Exception below: (occurs sometimes, ObjectDB 2.3.6_14) com.objectdb.o._RollbackException: Failed to commit transaction: at com.objectdb.o.JPE.g(JPE.java:89) ~[JPE.class:na] at com.objectdb.o.ERR.f(ERR.java:59) ~[ERR.class:na] at com.objectdb.o.OBC
79

Failed to commit transaction: Attempt to reuse an existing primary key value (613)

.RollbackException Failed to commit transaction: Attempt to reuse an existing primary key value (domain
16

Persist & remove in same transaction

I have a test case (attached) which performs the following actions: Open a new transaction Create & persist a simple entity object, EntityManager is flushed, Transaction is not committed Count ... Remove the entity object, EntityManager is flushed & cleared, Transaction is not committed Count
16

Error in production. Failed to commit transaction: Unexpected database state: BTree -152 is not found

.Read .doGet (115 ): Failed to commit transaction: Unexpected database state: BTree -152 is not found [ObjectDB 2.5.5] javax.persistence.RollbackException Failed to commit transaction: Unexpected
16

ObjectDB-2.6.9: Failed to commit transaction: Failed to set numeric value of field property Element.id using reflection

The following error is reported for objectdb-2.6.9.jar: Failed to commit transaction: Failed to set numeric value of field property com.greensoft.objectdb.test.entity.Element.id using reflection ... .9] javax.persistence.RollbackException Failed to commit transaction: Failed to set numeric value
16

Inefficient memory usage with very large transactions

When a large transaction is committed, ObjectDB increases some internal structures, i.e. allocates more memory, but from that point the structures remain big and the memory is not released even if all the next transactions are small. This problem was found during a heap analysis (see #9 in

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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