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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. ... expected to be valid. Could you please upload the project? What version of Eclipse are you using? ... with Tomcat by any chance? I have uploaded the project. Its eclipse juno. Thank you. ...

 
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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. ... which holds in an ArrayList 80 instances of Project. Each Project than contains hundreds of ProjectPart-s and in each ProjectPart there ... came in the moment when I was trying to add the 81st Project in the ProjectVersionHistory. The entity itself was not ...

 
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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" + ".*"); ... 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 ... and adding the following to the Netbeans IDE, Project, Run, VM Options: java -javaagent:C:\work\programs\Object ...

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

Hello to everyone! ... I've been developing a GwT application as a project for my computer science faculty. It consists in 2 or 3 hosts running ... time to waste because in a month we have to finish this project. Thank you and excuse me :( ...

 
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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: ... illustrates the behavior. 1) Import all Eclipse Project's 2) And then Run the JUnit Tests as PlugIn-Test ... essential files, and this could only be justified when the project structure itself is the subject of the question or issue. ...

 
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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 ). ... <persistence-unit name = "project.odb" > <mapping-file > ... value = "objectdb://localhost:6136/project.odb" /> <property name = ... Persistence . createEntitManagerFactory ( "project.odb" ) ;   //this set is alwasy empty with ObjectDB ...

 
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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    ... same super class. Please check if rebuilding the project and then redeployment solve the problem. You may also try using build time enhancement, which should guarantee that the project is fully enhanced when deployed. ObjectDB ...

 
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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). ... know in advance the results of open sourcing a commercial project. Success stories (as you mentioned) are well known. Failure stories may ... open source object database, which is a virtually dead project today. Financially, we are now in a good position with steady but ...

 
manual

Updating JPA Entity Objects

Explains how to use JPA to delete (remove) entity objects from the database.... employee. projects [ 0 ] = new Project ( ) ; // not detected automatically ...

 
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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     ... Please post a sample project, instructions on how to run it and details about the problems that you ... OdbTest::OdbTest.main" The Eclipse/F4 project is attached. Could you please help in fixing it? ...