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Speed of queries that return many objects

a standard database (or object database) activity. The main idea of a database is that large amount of data
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Spring LTW Problem

it would be a good idea to add something similar to ObjectDB. I don't even need LTW for ObjectDB because i
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Spring MVC Errors

I try to import the project from the tutorial but when doing so I get errors: 1. http://i.imgur.com/tbIsj.png and then when I try to start it anyways I get things like thaat: 2. http://i.imgur.com/G7UVu.png any ideas ? I installed m2eclipse plugin and Maven Integration for WTP and then I import
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substring works with string but not with char

to set a non String value for the parameter in this case. yes, i changed my mind and agree with you. throwing an exception is this case is good idea ;) chris
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Support of modifying an ObjectDB Entity class (Schema Change)

If you modify an ObjectDB Entity class will it be supported by a database set up using the old class? I already have an idea to iterate through a database, getting each record and then creating a record of the new type and replacing it, but I was just wondering if there is an easier way or
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TreeSet and compareTo() issue

TreeSet<>(); I presume the NPE is either on the 'dropdownValue' or 'ddv' variable.  Any ideas how to sort
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TYPE Expression

.jpa.JpaQuery.getSingleResult(JpaQuery.java:695)   any idea??? Alex Even this simple code causes
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Unexpected internal exception during set field of an Embeddable to null

Hello, we get an Unexpected internal exception and have no idea what goes wrong. We can reproduce (mostly) the error in a very big use case. In the big use case and we create and persist millions of SignalValueImpl objects (Embeddables). Partly as in the stack trace an Embeddable contain
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UserException - Object User#2 belongs to another EntityManager

have to comment a validity check), but the idea is to warn against mixing objects of different entity managers
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Using a file extension other than .odb

-standard method Persistence.createEntityManagerFactory(File, Map). This is a good idea, thanks. Starting