I am trying to do a simple persistence with jpa 2.0 and derby but I keep getting a NullPointerException. Exception and entity class - http://pastebin.com/QqXhRdcN The code where I am trying to persist EntityManager em = emf.createEntityManager(); Course c = new Course("cse", 214, "fall", 2010); em.getTransaction().begin(); ...
Hi All i wonder how to select between many to one relational i have two table Sub_category and Items sub category is own of relational, it contain list of Items Two class follow: @Entity @Table(name = "item") @NamedQueries({ @NamedQuery(name = "Items.findAll", query = "SELECT i FROM Items i"), @NamedQuery(name = "Items.findBy...
I have simple application which manages football teams and matches. I am using JPA, in the form editMatch.jsp i have property team_1, team_2 (instance of class Team) for choosing the team from the list. The problem is when editing match, the team_1 and team_2 dont select in the list, and after submitting the error message is: Property t...
I have jpa annotated entity class like: @Configurable @Entity @Table(name="PLAYERS") public class Player { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Column(name="ID") private Integer id; @Column(name="NAME") private String name; @PersistenceContext public transient EntityManager entity...
Hello, The following code throws an exception when invoking "em.refresh(p)": 1: EntityManager em = emf.createEntityManager(); 2: em.getTransaction().begin(); 3: 4: Product p = new Product("J&D", 35.0,"Whisky"); 5: em.persist(p); 6: 7: em.refresh(p); 8: em.getTransaction().commit(); 9: em.close(); When debugging the code, we see that ...
hi How to set L1 or L2 cache size-limitation. I concern of increasing the cache-size. One way is defining timeout for cache but i want to know is it possible to make a constraint for cache size or not? RGDS Navid ...
Using the EclipseLink JPA2 implementation (not sure if it's the same with the Hibernate implementation) I have a simple structure where an Organization entity has contracts. Here's the sql I exported from postgres to create the Organization CREATE TABLE organization ( key bigint NOT NULL, version integer ); If I specify the...
Hello All! i have new problem with JPA in EJB3 my stacktrace are: Caused by: javax.persistence.NonUniqueResultException: More than one result was returned from Query.getSingleResult() at org.eclipse.persistence.internal.jpa.EJBQueryImpl.throwNonUniqueResultException(EJBQueryImpl.java:1207) at org.eclipse.persistence.int...
dear all, I need new design patterns in JPA/ORM instead of POJO/JDBC/DAO patterns. Is there any recommended link? RGDS ...
Probably it is a basic question, but could not found the answer anywhere in the web. I am trying to use a second level cache (using ehcache) and just checked that some objects were being retrieved from database every time I tried to load them, the only difference was that I was not getting them by id but by a property that carries a SE...
In an app based on JPA2/Hibernate/Oracle+Spring+Wicket, I use the following model: public class Item { private String name; private Set<Application> apps; private ... } public class Application { private String applicant; private Item item; private Status status; private ... } The mapping between Item and Application is that e...
Hi, I'm currently trying to implement a ManyToMany Relationship with Data in the JoinTable. I'm following this approach with the Eclipselink JPA Framework. But I'm getting the following exception: org.eclipse.persistence.exceptions.EntityManagerSetupException.predeployFailed(EntityManagerSetupException.java:210) ... 23 more ...
I am using JPA (OpenJPA). I have following entries in my persistence.xml: <property name="openjpa.RuntimeUnenhancedClasses" value="supported"/> I also have Serviceoffering class listed in perisitence.xml. I am getting following exception when I try to run my jpa related code. What can be the problem? No metadata was found for type "c...
I have a problem about the management of dates with milliseconds. I understand the need to use the TIMESTAMP to store milliseconds: @Temporal(TIMESTAMP) @Column(name="DATE_COLUMN", nullable = false) @Override public java.util.Date getDate() { return this.date; } But if I can't compare this date to another instance of java.util.Date, u...
I'm trying to use Criteria API in my new project: public List<Employee> findEmps(String name) { CriteriaBuilder cb = em.getCriteriaBuilder(); CriteriaQuery<Employee> c = cb.createQuery(Employee.class); Root<Employee> emp = c.from(Employee.class); c.select(emp); c.distinct(emp); List<Predicate> criteria = new Arra...
I have a bunch of service (ejb 3) classes that i want to unit test. In order to do so, i have added to their implementing classes an overloaded constructor which takes an EntityManager as an argument. The idea is that during my units tests i will create a both an EntityManager instance from a persistence unit specific for my unit tests, ...
Hello, I have written few Restful web services using Eclipselink for object relation mapping. Now i am calling these services from client side through GET method. Here while passing some special characters as a part of data, i am facing following problems -- 1) + character is storing as space character in database(MySql). 2) How to pas...
Hello, I am using @Id with @GeneratedValue(strategy=GenerationType.TABLE), just checked that hibernate have created a table hibernate_sequences, but the column type for the sequence_next_hi_value is an int(11). I have some entities (I mean tables) that have an id field of type bigint(20), will that works ? and when my table reach the nu...
Hello, Need to put @Index even when I marked with @Column(unique=true) ? I have a property that will be used frequently to retrieve the entity and wanted to make it an index column on the database. So this property is already marked with @Column(unique=true), do I need to put @Index? thanks ...
Do you think it is necessary to mark id fields with insertable = false and updatable = false ? I haven't seem much people doing this before, but today I checked one code that used these properties setted to false for an id field. Regards ...