I have an application using Tomcat/Spring 3/JPA/Hibernate but my merges do not commit to datbase. This is the configuration: spring-conf.xml: <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="com.mysql.jdbc.Driver" /> <property name="url" value="jd...
Hi I have a problem fetching the skills from the volunteer. for some reason i dont get the list when using this method public Volunteer getVolunteer(int id){ Volunteer vo; Query q; q = em.createNamedQuery("Volunteer.findById").setParameter("id", id); vo = (Volunteer) q.getSingleResult(); for(Skill s: vo.getSkills()){ System.o...
I use Hibernate for JPA DB mapping with Derby DB. For a complex object structure I am getting "org.apache.derby.client.am.SqlException: SELECT statement has too many items in GROUP BY, ORDER BY or select list": org.apache.derby.client.am.SqlException: SELECT statement has too many items in GROUP BY, ORDER BY or select list. org....
I currently have a mapping problem and no idea how to solve it. Here is what we currently have. AbstractEntity is a @MappedSuperclass ExtendedEntity is an abstract @Entity extending AbstractEntity with InheritanceType.TABLE_PER_CLASS Proposal is a subclass of ExtendedEntity that has been stored in a single table so far. Now I want to...
@Entity public class Person { @ElementCollection private List<Location> locations; [...] } @Embeddable public class Location { private Integer dummy; private Date creationDate; [...] } Given the following structure, I'd like to perform the HQL or CriteriaQu...
Hi all, I wanted to know if there is a way to get in a One2Many relationship a field of the One side that is an aggregate of the Many side. Let's take the following example: @Entity public class A { @Id private Long id; @OneToMany (mappedBy="parentA") private Collection<B> allBs; // Here I don't know how to Map the latest B by d...
I'm working on a application that needs to do some database operations. I created a static variable for EntityManagerFactory and Intialized it in the method that gets called by the application if (emf == null){ emf = Persistence.createEntityManagerFactory("example"); } try { em = emf.cr...
I use Netbeans as IDE and use the wizards to generate Entities. If I want to define custom NamedQueries (not the ones auto generated) how can I define those outside of the entity so I don't lose them if I have to recreate the entity using the wizard? ...
@Entity public class MUser implements Serializable, MemoEntity { private static final long serialVersionUID = 1L; @Id private String email; @OneToMany(cascade=CascadeType.ALL, orphanRemoval=true) private Set<Meaning> mengs = new HashSet<Meaning>(); Shouldn't this mean that I get the constraint with a "on delete cascade"? This is wha...
I've JPA entities and need to perform logic with them. Until now a huge static database class did the job. It's ugly because every public interface method had an private equivalent that used the EntityManager, to perform transactions. But I could solve that having a static em too! However i'm wondering if that's an appropriate design, es...
Suppose I have a class 'Cheese' with fields type and purchaseDate, such that: public class Cheese{ CheeseType cheeseType; String purchaseDate; public setPurchaseDate(String value){ purchaseDate=value; } public Class CheeseType{ String type; public setType(String value){ type=value; ...
Does JPA support embedding a class attribute whose type is a parameterized generic or java.lang.Object? For example: public class Foo<T>; { private T param1; private Object param2; } I have a use case where I have a class that "wraps" some arbitrary class (the generic T or java.lang.Object) via aggregation plus contains pr...
Using JPA, can we define an enum as id of an entity? I've tried the following: public enum AssetType { .... } @Entity @IdClass(AssetType.class) public class Adkeys { private AssetType type; @Id @Enumerated(EnumType.STRING) @Column(nullable = false) public AssetType getType() { return type; } } Using Ope...
I have following model: Report, ReportSection and ReportSectionProperty. Report has zero to many ReportSections, ReportSection has zero to many ReportSectionPropert-ies. This would qualifie as three levels deep object graph. I create new Report, then add some sections to it, then add some properties to it. When I try to persist Report...
hi, I get this hibernate error(in the title), when I turn off the cascading(Cascade.ALL) and start to manually em.persist() the lower-in-the-hierarchy entities. So this is not possible at all? I'm sure that the entities are persistent before, they are even in the database, but I get this error. How to fix it? EDIT: java.lang.IllegalStat...
Hi, how can I force the EJB to not flush everything after every single command, I want to do a transaction. I've read that this is done somehow declaratively. But how exactly? @Stateless public class SomeBean{ @PersistenceContext EntityManager em; public void doSomeStuffAndThenFlushToTheDb(){ em.persist(entity); // it's flushed ...
This seems like it should be a pretty simple question, or at least have a simple answer. But - I'm really not a database guy, and I'm still pretty far down on the Hibernate learning curve. That said, here's the setup: Consider a unidirectional many-to-many relationship between two entities, from Foo to Bar: (pardon any typos below, th...
hi, consider hibernate-link and JTA as peristence provider. How can I force em not to flush anything, and to handle it by myself? @Stateless public class SomeBean{ @PersistenceContext EntityManager em; public void method(){ em.persist(entity); // will get managed em.clear(); // everything gets unmanaged } } I would ex...
Anybody has an idea why adding the annotation-driven declaration leads to the aopalliance classes not found. I have not explicitly defined the weaving so using Spring defaults. Any help is appreciated ...
Given: @Inheritance(strategy=InheritanceType.SINGLE_TABLE) @DiscriminatorColumn(name="postType", discriminatorType=DiscriminatorType.STRING) public class Post {} @DiscriminatorValue(value = PostType.BUG) public class BugReport extends Post {} That is ... Bugs start life in this system as a Post. Later, they can be promoted(?) to bei...