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[ODB1] Chapter 3 - Persistent Classes

Explains what a persistence capable class is and which types are supported by JDO. Persistent Classes are user defined classes whose instances can be stored in a database using JDO. Instances of these classes that represent objects in the database are called persistent objects or persistent instances . Objects that do not repre ...

 
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Closed EntityManagerFactory after upgrading glassfish 3.1.1 to 3.1.2

Hi. I have faced a very serious issue. After upgrading the GlassFish server from 3.1.1 to 3.1.2 this error appears:   #1 2012-03-07 11:07 Hi. I have faced a very serious issue. After upgrading the GlassFish server from 3.1.1 to 3.1.2 this error ap ...

 
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ObectDb 2.3.6 in OSGi environment

Hello, I'm trying to use ObjectDb within OSGi bundles. I have one bundle for db accens which uses ObjectDb and another bundle which includes the POJO models. Everytime I start in plugin evironement i get an PersistenceException, because my POJO not found. If try the same test in normal Java environment everthing works fine. Can you please advice? Thx Peter #1 2012-06-29 02:17 Hello, I'm trying to use ObjectDb within OSGi bundles. I have one bundle for db accens which uses Obj ...

 
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Optimization Question

One of our uses for your ObjectDB software is in maintaining the current state of a large number of data objects called tracks. These tracks change very frequently over time (every 10-15 seconds is not unreasonable), but they are also very large complex data structures so it's extremely difficult to identify exactly what fields have changed from one update to the next. Currently the following sequence executes when a track update comes in: - If it’s a new track simply add it to the database. #1 2010-06-16 15:41 One of our uses for your ObjectDB software is in maintaining the current state of a large number of data objects cal ...

 
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ClassCastException on SELECT NEW ... after UPDATE over Java RMI

Hi, we are using ObjectDB 2.5.4_04 on Linux. Our application, which uses ObjectDb as a DB, exposes a Java RMI interface which allows remote RMI clients to run JPQL queries on the DB. The application internally runs SELECT NEW ... queries. For example: #1 2014-05-15 04:50 Hi, we are using ObjectDB 2.5.4_04 on Linux. Our application, which uses ObjectDb as a DB, exposes a Java ...

 
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objectdb-2.6.9_02 (with "objectdb.temp.no-enhancement-crc-check") vs. generic classes with interfaces: detailed investigation

objectdb-2.6.9_02 (with "objectdb.temp.no-enhancement-crc-check" system property) The following is a detailed report on investigation of multiple issues that have been mentioned in the following forum postings and issue reports (but please do not visit them from here now, the diagnostics there are now obsolete): - Issue #282 - ObjectDB-2.6.9: Failed to commit transaction: Failed to set numeric value of field property Element.id using reflection #1 2016-08-21 09:00 objectdb-2.6.9_02  (with "objectdb.temp.no-enhancement-crc-check" system property) The follow ...

 
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Can't post on your forum

Since yesterday, I can't post on the forum because it always says that I should log in in order to do that. I was already logged in, but, anyway, it appeared as not. I go to log in, then I authenticate, then I'm redirected to the home page, but it still looks that I'm not logged in, so I can't post on the forum. I tried removing the cookies, but nothing. I tried in another browser, but the same. I have new bugs to post, so it's pretty important. #1 2014-05-22 09:21 Since yesterday, I can't post on the forum because it always says that I should log in in order to do that. ...

 
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Performance and memory usage of queries

Hello, we can't understand why the performance of queries is not the best and the execution requires so much memory. In the implementation of our UnitTests we have used "DELETE FROM Object" to delete the database. That did not work because we often get an "out of memory" exception. What's all done in the execution of queries? Why is so much memory is required, although from the application point of view, no object is loaded. #1 2015-03-10 09:22 Hello, we can't understand why the performance of queries is not the best and the execution requires ...

 
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Pessimistic Lock Timeouts setting

Hi,   I realise that JPA2 doesn't necessarily define a standard API way for Lock Timeouts. However, there is a standardised query 'hint' that can be setup to make the underlying DB lock a record for a specific time. The hint property is: "javax.persistence.lock.timeout" #1 2011-04-29 04:30 Hi,   I realise that JPA2 doesn't necessarily define a standard API way for Lock Timeouts. Howev ...

 
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Failed to commit transaction: Attempt to commit a rollback only transaction

Anyone know what this means?? Suddenly cropped up.   Failed to commit transaction: Attempt to commit a rollback only transaction (error 613) at com.objectdb.jpa.EMImpl.commit(EMImpl.java:271) at javax.jdo.Transaction$commit.call(Unknown Source) #1 2011-05-24 22:22 Anyone know what this means?? Suddenly cropped up. Failed to commit transaction: Attempt to commit ...