openjpa

问题 I'm having trouble with RESOURCE_LOCAL transaction type for JPA in Fuse ESB. I also don't have a complete understanding of whether JTA or RESOURCE_LOCAL is better for me. My persistence.xml : <persistence-unit name="invoicePersistence" transaction-type="RESOURCE_LOCAL"> <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider> <jta-data-source>osgi:service/javax.sql.DataSource/(osgi.jndi.service.name=jdbc/invDataSource)</jta-data-source> <non-jta-data-source>osgi:service

问题 I am using JPA with openjpa implementation beneath, on a Geronimo application server. I am also using MySQL database. I have a problem with updating object with nullable Date property. When I'm trying to merge entity with Date property set to null, no sql update script is generated (or when other fields are modified, sql update script is generated, but date field is ommited from it). If date field is set to some other not null value, update script is properly generated. Did anyone have

问题 I'm using OpenJPA with QueryDSL, I try to avoid manipulating Tuple objects by using the bean projections features of QueryDSL. I have for example these two Entity, with a @ManyToOne relation. @Entity public class Folder { private Long id; private String name; private String path; @ManyToOne @JoinColumn(name = "FK_FILE_ID") private File file; } @Entity public class File { private Long id; private String fileName; } When I'm executing this query : List<Folder> listFolders = query.from(folder)

问题 I'm using OpenJPA with QueryDSL, I try to avoid manipulating Tuple objects by using the bean projections features of QueryDSL. I have for example these two Entity, with a @ManyToOne relation. @Entity public class Folder { private Long id; private String name; private String path; @ManyToOne @JoinColumn(name = "FK_FILE_ID") private File file; } @Entity public class File { private Long id; private String fileName; } When I'm executing this query : List<Folder> listFolders = query.from(folder)

问题 I'm new to EJB 3 and the JPA. I've created a datasource in the appserver which is jdbc/AppDataSource . The default persistence provider is left as com.ibm.websphere.persistence.PersistenceProviderImpl . And I left the default jta data source JNDI name as AppDataSource itself. I'm actually confused regarding JTA and non-JTA. What differentiates them? I generated the entities and created an EntityTransaction object in the bean. Upon calling the persist() and commit() methods, I get an error:

问题 What could cause the CriteriaQuery orderBy method stop working? Here are the implementations: OpenJPAEntityManager kem = OpenJPAPersistence.cast(entityManager()); kem.getFetchPlan().clearFetchGroups(); kem.getFetchPlan().addFetchGroup("order_search"); CriteriaBuilder builder = kem.getCriteriaBuilder(); CriteriaQuery<Order> query = builder.createQuery(Order.class); Root<Order> order = query.from(Order.class); query.select(order); Predicate main_condition = buildWhereClause(builder, query,

问题 I have a dumb question. It would be great if this could be done, but I am not holding my breath. I need a single column from a table linked to my JPA entity to be a collection in said JPA entity. Is there any way, that I can just get back that column alone that is related to that entity, instead of having to get back an entire table (which could be very costly?) Can I perform a query inside that JPA entity that will be performed and loaded eagerly into a collection? I am trying to avoid

问题 I'm using OpenJPA and I have a lock problem. I already understand what's an OptimisticLockException and when it's thrown. But how can I deal with it ? Below*, you can find a small paragraph about the optimistic lock exceptions. In a nutshell, how I can totally disable the lock manager ? In my persistent.xml, I have the following xml code but it does not work. Why ? ... <properties> <property name="openjpa.LockManager" value="none" /> </properties> ... *According to the wikibooks about the

问题 Is anyone successfully using OpenJPA with Glassfish? I'm trying to use OpenJPA 2.1 with Glassfish 3.1 Open Source. I've followed the instructions to integrate the two here -> http://weblogs.java.net/blog/ss141213/archive/2006/07/using_openjpa_a.html I have a very simple EJB project in Eclipse Indigo with the following: com.rares.test.Person - @Entity com.rares.test.PersonManager - interface com.rares.test.PersonDao - @Stateless However, when I try to deploy I get a ClassNotFoundException on

问题 Is anyone successfully using OpenJPA with Glassfish? I'm trying to use OpenJPA 2.1 with Glassfish 3.1 Open Source. I've followed the instructions to integrate the two here -> http://weblogs.java.net/blog/ss141213/archive/2006/07/using_openjpa_a.html I have a very simple EJB project in Eclipse Indigo with the following: com.rares.test.Person - @Entity com.rares.test.PersonManager - interface com.rares.test.PersonDao - @Stateless However, when I try to deploy I get a ClassNotFoundException on