jdo

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java.lang.UnsupportedOperationException thrown when getObjectById() called

I have an entity with a Key set as follows: KeyFactory.Builder keyBuilder = new KeyFactory.Builder(MyClass.class.getSimpleName(), \"uniqueString\");[详细]

2023-03-15 18:57 分类：问答
Cant delete photo in JDO

I\'开发者_运维知识库m have a hard time doing this. I have done a db with JDO for google app engine that allows for a registered user to upload a photo. But now i\'m trying to delete that same photo an[详细]

2023-03-14 21:02 分类：问答
How to deploy a JDO based EAR file on GlassFish?

I\'m really desperate right now, because I\'m building a little application that is split up into several projects. There is a web application that uses Vaadin and an EJB container that should do the[详细]

2023-03-14 06:22 分类：问答
owned and unowned relationships

What exactly is meant by owned and unowned relationships? These terms are often used in JPA/JDO documentation, but I haven\'t found a good definition of th开发者_运维技巧em.In addition to Nix\'s anwse[详细]

2023-03-13 23:08 分类：问答
JAVA Google App Engine, JDO select specific data and do summ on all (like excel)

I am new to GAE and my skill level in JAVA is novice to intermediate somehow.. So I need help on retriving a specific filed that is an integer from JDO, and on that do the sum all, like in excel wher[详细]

2023-03-13 20:19 分类：问答
Limit on Google App Engine Entities' Collection attributes

Okay, so as many 开发者_如何转开发of you may know, one can define entities with attributes like[详细]

2023-03-13 12:30 分类：问答
Datanucleus/JDO, persisting and retrieving java.util.Set attribute

I have a attribute of type Set in my persistable class. I am persisting to a H2 database. The class persists correctly and I can view the data using the H2 console and see the Set attribute has been s[详细]

2023-03-12 16:52 分类：问答
How to deploy Java App Engine application on another cloud?

I have written a relatively simple Java App Engin开发者_如何转开发e application which I would like to be able to port to another cloud provider.[详细]

2023-03-11 06:02 分类：问答
Problem deleting an entity which has a dependent "Set" Entity

I have a \"Parent\" entity which has a Set of \"Child\" entities, as follows: class Parent { @Persistent @Element(dependent = \"true\")[详细]

2023-03-11 02:09 分类：问答
Google Application Engine DTO to JDO

Is there anyway to transfer 开发者_如何学PythonJDOs accross RPC as DTO such in GWT, we used to have Gilead for hibernate Objects??[详细]

2023-03-08 22:08 分类：问答