My colleague and I have a web application that uses Spring 3.0.0 and JPA (hibernate 3.5.0-Beta2) on Tomcat inside MyEclipse. One of the data structures is a tree. Just for fun, we tried stress-testing the "insert node" operation with JMeter, and found a concurrency problem. Hibernate reports finding two entities with the same private key...
Hi, I want to validate if input exist in database in netbeans IDE protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { Transaction1 t = new Transaction1(); //t.setTransactionID(12345); t.setFromAccNo(Integer....
Suppose I have an entity: @Entity public class AnEntity implements Serializable{ @ElementCollection private List<String> strings = new Vector<String>(); // other stuff } I am using EclipseLink(JPA 2.0). The strings in this List may have the same values in many AnEntity objects. That is to say, many AnEntity objects may referen...
Hi, I would like a 'RolesPlayed' entity with the following columns user role department/project/group All the three columns above constitute a composite primary key. I would like to know if defining a column to be one of department/project/group possible ? If yes, how ? Or do I need to break the entity into DepartmentRoles, GroupR...
Does it make sense to have a @OneToOne member contain a @ForiegnKey annotation. @Entity class User { @Id @GeneratedValue(strategy = IDENTITY) int id; @OneToOne @ForeignKey @JoinColumn(name = "home_address_id", referencedColumnName = "id") Address homeAddress; } @Entity class Address { @Id @Generat...
Hi, I have made my parameter as a hyperlink. Now i want to click the hyperlink and then list of all information of that value in hyperlink. How do i do that? From Account No | To Acc No | Amount | Date So, from account no is value exist from db, and a hyperlink. so i wanna click from accno e.g (123456), and then it will list all tran...
I'm using GraniteDS(2.1.0RC2) on GAE with JPA annotiations. I have following class on flex side: [Bindable] [RemoteClass(alias="models.User")] public class User { public var key :String; public var login :String; } and on java side: @Entity public class User { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) priv...
Short background: I have a software that regularly downloads files. The Statistics of these downloads are stored in the database as a DownloadResult entity, which is in turn associated to the entity representing the download job. Now I want to make sure, that only a fixed number of the n latest downloads are preserved in the database. A...
public static List<Transaction1> debitSourceAccBalance (Integer youraccinput, Integer toaccinput, String recname, Double amtsender) { EntityManager em = emf.createEntityManager(); em.getTransaction().begin(); Query q = em.createQuery("SELECT t from Transaction1 t where t.fromAccNo =:youraccinput AND t.toAccNo =:toaccinput A...
In IntelliJ I get this weird error when I try to compile. Cannot find annotation method 'cascade()' in type 'javax.persistence.ManyToOne': class file for javax.persistence.ManyToOne not found I know, it seems pretty obvious what the problem is, but having spent too much time on this problem I now turn my trust to you! I use ideaCommu...
I have a very weird problem. Have an application using Hibernate and spring.I have an entitymanger defined which uses a JNDI lookup .It looks something like this <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <property name="dataSource" ref="dataSource" /> <propert...
Hi, im new to JPA, i got the error above when trying to persist the transaction data. Here's my Entity: @Entity @Table(name = "transaction1") @NamedQueries({ @NamedQuery(name = "Transaction1.findAll", query = "SELECT t FROM Transaction1 t"), @NamedQuery(name = "Transaction1.findByTransactionID", query = "SELECT t FROM Transac...
Hi, In my code, I did as follows: queried for a course entity populate it with the given course data. courseDao.update(entity) which internally calls persist(entity) method. Surprisingly, the data is got updated successfully. I am confused with this behaviour of persist method. Please help me out. code is as below: //My Service....
I'm on a project using EclipseLink 1.1, and I have a query where the obvious thing for me to do is use a Where-In clause, like so: List<String> things = populateListOfThings(); String queryString = " select s from Stuff s where s.thing in (:things) "; Query query = em.createQuery(queryString); query.setParamete...
There are few applications that use java persistence. Each application has its own set of entities that represents the same tables in DB. For instance, application A has entities for Table1, Table2, etc; at the same time, application B also has entities for Table1, Table2, etc. Instead of that I want to create a new EJB module with 1 b...
I'm trying to retrieve a table using persistence framework the code i have written is in simple java class file in webapplication the code in the java class EntityManager em = null; EntityManagerFactory emf = null; public List fname (String id) { String fname = null; List persons = null; try { emf = Persistenc...
I am looking for a way to have a typesafe primary key for my entities using generics in Hibernate. Instead of doing this @Entity public class User{ @PrimaryKey Long id } I was thinking of doing this... @Entity public class User{ @PrimaryKey PrimaryKey<User,Long> id } Or take the type inference even further... Any ideas? Has ...
Hi All, I'm building a J2SE application with EJB3 and an Oracle Express Edition DB. My problem is like that - I set an EntityBean in my project which matches a table in the DB. The table contains a column which is not nullable and has a default value. All I want is that when persisting a new data to this table using the EJB, the column...
I'm new to JPA so forgive me if not being clear. Basically I want to prevent concurrent modifications by using Optimistic Locking. I've added the @Version attribute to my entity class. I need to know if this algorithm on handling OptimisticLockException is sound. I'm going to use the Execute Around Idiom like so: interface UpdateUnitO...
I have table MV_ULICE in schema ADRESY. However in JPA I connect to database (Oracle) using different user then ADRESY. This user has privilege to access tables from schema ADRESY, so in JPA there was no problem with defining entities, since you can easily provide different schema in entity definition: @Entity @Table(name = "MV_ULICE", ...