persistence

I want to avoid serialisation ( in JMS / AMF ) but still persist the field with JPA/Hibernate. Is the transient modifier my friend ? Are @Transient annotation and the transient modifier related or not a all ? The java specification precise that a transient field will not be saved to a persistent storage by a system service. But is hibernate a system service ? ( i dont think so ) http://java.sun.com/docs/books/jls/second_edition/html/classes.doc.html#78119 And java.io.Serialisable seams to indicate that a out.writeObject and in.readObject are called for serialisation http://download.oracle.com

I'm working with Spring MVC and I'd like it to bind a a persistent object from the database, but I cannot figure out how I can set my code to make a call to the DB before binding. For example, I'm trying to update a "BenefitType" object to the database, however, I want it to get the object fromthe database, not create a new one so I do not have to update all the fields. @RequestMapping("/save") public String save(@ModelAttribute("item") BenefitType benefitType, BindingResult result) { ...check for errors ...save, etc. } There are several options: In the simpliest case when your object has only

I have a windows application that uses an assembly that stores some configuration settings in the default application settings. The settings can be changed in run time and are persisted thus: Properties.Settings.Default.SelectedCOMPort = options.SelectedCOMPort; Properties.Settings.Default.Save(); The settings are saved correctly and I confirm this by looking at the user.config file saved in the users application directory E.g. C:\Documents and Settings\e399536\Local Settings\Application Data\MyCompany\MyTool However when the tool is closed and then started again all the settings are loaded

I'm setting up a standalone Java service with an in-process, in-memory HSQL database. Persistence.xml <persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd" version="2.0"> <persistence-unit name="manager"> <class>tr.silvercar.data.entities.User</class> <properties> <property name="javax.persistence.jdbc.driver" value="org.hsqldb.jdbcDriver" /> <property name="javax.persistence.jdbc.user" value="sa" /> <property name=

I tried to use the DataTime in my entity class. Adding @Temporal(TemporalType.DATE) above the field, I got the error saying "The persistent field or property for a Temporal type must be of type java.util.Date, java.util.Calendar or java.util.GregorianCalendar" . I can introduce the conversion back and forth; using setters and getters as follows: @Temporal(TemporalType.DATE) private Calendar attendanceDate; public DateTime getAttendanceDate() { return new DateTime(this.attendanceDate); } public void setAttendanceDate(DateTime attendanceDate) { this.attendanceDate = attendanceDate.toCalendar

I've seen differences of opinion across the web on this. It has been said that starting with iOS 5.1, local data storage for HTML5 content on the iPad is no longer guaranteed to be persistent, however on Apple's current Safari developer pages ( https://developer.apple.com/technologies/safari/html5.html ), offline persistence is suggested to be guaranteed. Does anyone have any recent experience with this subject and able to comment on how reliable the database features of HTML5 are with Safari on iPad? This will probably be enough information: The w3c spec of localStorage is: The second storage

Have put the persistence.xml in the classpath of the project in eclipse because before the error was that the file was not found. Now gives this error: Caused by: javax.persistence.PersistenceException: Invalid persistence.xml. Error parsing XML [line : -1, column : -1] : cvc-elt.1: Can not find the declaration of element 'persistence' <persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.1" xsi:schemalocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_1.xsd"> <persistence

Is there a way to change the JPA fetch type on a single method without editing the entity object? I have a shared ORM layer consisting of JPA entity classes. This ORM layer is accessed by two DAO layers. One DAO needs lazy fetching, as it is for my web application, the other needs eager fetching, as I need it to be threadsafe. Here is an example method from my threadsafe DAO, @PersistenceContext(unitName = "PersistenceUnit", type = PersistenceContextType.TRANSACTION) private EntityManager em; public ErrorCode findErrorCodeById(short id) { return (ErrorCode) em.createNamedQuery("ErrorCode