About projection

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Eclipse/JPA database tutorial

Hello Sir/Madam, I followed all the steps correctly as given in the tutorial. But when i run it , I'm getting an error saying, the resource not available. Please help regarding the issue as soon as possible. Thank you. #1 2012-09-16 07:20 Hello Sir/Madam, I followed all the steps correctly as given in the tutorial. But when i run it , ...

 
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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, but the same error is happening also on the fixed DB file. Btw. during fixing the DB file an Internal error was thrown (details here: http://www.objectdb.com/database/issue/285 ), but the fixing went on and created a new file. #1 2016-11-12 08:08 Hi, we started to get a java.lang.NegativeArraySizeException from ObjectDB upon changing an object in the ...

 
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UserException: Package com.example.model is not found by the enhancer

My program works fine when I run it from Netbeans but as soon as I clean and build and move the dist directory out of the project to a remote location and run it using java -jar example.jar then I get the exception: com.objectdb.o.UserException: Package com.example.model is not found by the enhancer It occurs on this line: com.objectdb.Enhancer.enhance("com.example.model" + ".*"); #1 2014-06-15 12:19 My program works fine when I run it from Netbeans but as soon as I clean and build and move the dist directory ou ...

 
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How to have a distribuited GWT application with ObjectDB and Spring?

Hello to everyone! #1 2013-05-22 12:53 Hello to everyone! I've been developing a GwT application as a project for my computer science facult ...

 
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Performance in large transactions

Hello, we have a performance problem when we use a large transaction. Let's do exactly the same in several transactions the ObjectDB works much faster. In our use case, we create many new entities and between the creations we call a select query. The execution of the query becomes slower at each iteration. (In the query, we search for an item of type Entity2. However, there is only one entity.)   Pseudocode for the fast and the slow solution FAST: #1 2015-03-03 15:07 Hello, we have a performance problem when we use a large transaction. Let's do exactly the same i ...

 
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mapping file is not being loaded

Hi, I am evaluating ObjectDB by using it with an in-house developed library in order to prototype its capabilities / performance. I am having a problem in that the in-house library in question reads a simple configuration file to determine available persistence units, and then bootstraps them using the JPA Persistance.createEntityManagerFactory() method and passing in the persistence unit name (again, obtained from the configuration file ). #1 2012-06-22 15:00 Hi, I am evaluating ObjectDB by using it with an in-house developed library in order to prototype its capabilitie ...

 
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NoSuchFieldError: __odbTracker on NetBeans 7.3 + JBoss 7.1.1

When using inheritance throw exception java.lang.NoSuchFieldError: __odbTracker on NetBeans 7.3 + Jboss 7.1.1, but works fine on NetBeans 7.3 + GlassFish 3.1    #1 2013-08-15 12:42 When using inheritance throw exception java.lang.NoSuchFieldError: __odbTracker on NetBeans 7.3 + Jboss 7.1.1 ...

 
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Opensource ObjectDB

I know you have answered this question some years ago, but I think about the databases that have recently "triumphed" like MySQL, MongoDB or SQLite and they are free databases. Also in the Java world we have the example of Hibernate (ORM) and Apache Hadoop (framework for Big Data). #1 2014-05-13 16:47 I know you have answered this question some years ago, but I think about the databases that have recently "triump ...

 
manual

Updating JPA Entity Objects

Explains how to use JPA to delete (remove) entity objects from the database. Modifying existing entity objects that are stored in the database is based on transparent persistence, which means that changes are detected and handled automatically. This page covers the following topics: Transparent ...

 
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Fantom

  Hi, so far I've been able to get ObjectDb to persist objects from many JVM languages, eg.: Java/Groovy/Scala/Kotlin. However, I can't seem to get Fantom to work. Anyone tried this yet? Dave     #1 2012-03-23 19:24 Hi, so far I've been able to get ObjectDb to persist objects from many JVM languages, eg.: Java/Groovy/Scala/ ...