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  • 1:M relationship in Hibernate and cascading operations

    - by EugeneP
    Table SUBCOURSE references COURSE COURSE(id, name) SUBCOURSE(id, course_id, name) So, 1:M. Hibernate generates for Course: @OneToMany(fetch = FetchType.LAZY, mappedBy = "course", cascade = CascadeType.ALL) public Set getSubCourses() { return this.subCourses; } for Subcourse it generates @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "course_id", nullable = false) public Course getCourse() { return this.course; } Now the problem is that cascading does not work as expected. I want to create a collection of SubCourse objects (Set), fill it and then bind it to setSubCourses() of Course object. Though, having ManyToOne thing in a Subcourses table, I need to manually setCourse() before adding to collection on each object. If I do not do so, an exception is raised. What can you recommend me?

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  • Expanding collapsed code in Eclipse IDE

    - by rabin
    Instead of going through each (+) sign at the left and clicking them to expand the collapsed code snippets, is there a shortcut or menu item (I couldn't find it, VS has that) to expand all the collapsed code/comments at once? Thanks.

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  • OverRiding Help

    - by user445714
    Few questions on over riding. I am interiting a method openRead from another class, the method is to be overridden so that the scanner class uses the provided delimiter pattern, which is referenced. I need to make use of the scanner class useDelmiter method method from another class [code] public boolean openRead() throws FileNotFoundException { sc = new Scanner(new File(fileName)); if (fileName != null) { return true; } else { return false; } } [/code] delimiter [code] protected final String DELIMITERS = "[\s[^'a-zA-Z]]"; [/code] I'm at a loss to how i over ride this using the constant delimiter.

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  • programming help

    - by user208639
    class Person holds personal data Its constructor receives 3 parameters, two Strings representing first and last names and an int representing age public Person(String firstName, String lastName, int age) { its method getName has no parameters and returns a String with format "Lastname, Firstname" its method getAge takes no parameters and returns an int representing the current age its method birthday increases age value by 1 and returns the new age value Create the class Person and paste the whole class into the textbox below public class Person { public Person(String first, String last, int age) { getName = "Lastname, Firstname"; System.out.print(last + first); getAge = age + 1; return getAge; System.out.print(getAge); birthday = age + 1; newAge = birthday; return newAge; } } im getting errors such as "cannot find symbol - variable getName" but when i declare a variable it still not working, i also wanted to ask if i am heading in the right direction or is it all totally wrong? im using a program called BlueJ to work on.

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  • Column moved [finished] event in JTable

    - by chown
    How should I detect that column moved action is finished in JTable? I've added columnModeListener to my column model but the problem is columnMoved method is called every time a column moves (by certain pixels). I don't want this behavior. I just want to detect when the column dragging is finished. columnModel.addColumnModelListener(new TableColumnModelListener() { public void columnAdded(TableColumnModelEvent e) { } public void columnRemoved(TableColumnModelEvent e) { } public void columnMoved(TableColumnModelEvent e) { //this is called so many times //I don't want this, but something like column moved finished event System.out.println("Moved "+e.getFromIndex()+", "+e.getToIndex()); } public void columnMarginChanged(ChangeEvent e) { } public void columnSelectionChanged(ListSelectionEvent e) { } }); I hope it is clear what I'm looking for. Thanks.

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  • Why would you use a MyObject[] internally, but expose a List<MyObject>?

    - by timmyd
    I have come across a class that has an immutable property: MyObject[] allObjs The property is initialized like this: List<MyObject> objs = createAllMyObjects(); allObjs = objs.toArray(new MyObject[objs.size()]); When it is exposed through the accessor, it's done as a List: public List<MyObject> getAllMyObjects() { return Collections.unmodifiableList(Arrays.asList(allObjs)); } Why would a programmer do this? Is there a benefit that I don't know about? Performance is not a concern, as the array of objs will only ever number in a few dozen elements. It seems that we are going round and round in circles. The class is a sort of factory, so it's got a private constructor and exposes only static methods (not sure if this could be a reason for the madness).

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  • Dynamic class annotation

    - by jlanza
    Hi, I want to annotate a class dynamically to make it the more generic as possible: public class Test<T> { @XmlAttribute(name = dynamicvalue) T[] data; public Test(String dynamicvalue) { } } Is there any way to achieve something like this. TA

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  • Can I un-assign (clear) all fields of an instance?

    - by Roman
    Is there a simple way to clear all fields of an instance from a an instance? I mean, I would like to remove all values assigned to the fields of an instance. ADDED From the main thread I start a window and another thread which controls state of the window (the last thread, for example, display certain panels for a certain period of time). I have a class which contains state of the window (on which stage the user is, which buttons he already clicked). In the end, user may want to start the whole process from the beginning (it is a game). So, I decided. So, if everything is executed from the beginning, I would like to have all parameter to be clean (fresh, unassigned). ADDED The main thread, creates the new object which is executed in a new thread (and the old thread is finished). So, I cannot create a new object from the old thread. I just have a loop in the second thread.

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  • Are there any data-binding solution that works in C++ and GWT and supports structures polymorphism?

    - by user116854
    I expect it should share a common description, like XmlSchema or IDL and should generate classes for target language. I found Thrift and it's really nice solution, but it doesn't support structures polymorphism. I would like to have collections of base class objects, where I could place instances of subclasses, serialize this and deserialize at the opposite side. Some mechanism of polymorphic behavior support, like Visitor, would be a perfect. Does anybody know something suitable for these requirements?

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  • Works on development server but it doesn't on Google App Engine (Sessions).

    - by grep
    Hi, I have this code that works just fine on the development server but when I deploy the application, the session isn't created. What am I doing wrong? HttpSession session = req.getSession(true); session.setAttribute("loggedIn", new String("true")); Edit: The sessions are enabled. What I realized now is that the _ah_SESSION variable is not being created, not even on the development server (although it works).

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  • What is the correct way to set size of elements of GUI?

    - by Roman
    I am using swing to create my GUI. J have a JFrame containing one main JPanel which, in its turn contain several JPanels which, in their turn, contain buttons. I would like to set certain sizes to mu buttons and JPanels. How does it work? Should I set sizes of my buttons and then the size of the JPanel and the JFrame will be set according to the buttons sizes? Or it works in the opposite direction? I set size for the JPanel and the size of the buttons will be set automatically?

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  • hibernat createSQLQuery use CacheQuery?

    - by cometta
    Query query=getHibernateTemplate().getSessionFactory().getCurrentSession().createSQLQuery( "select... getHibernateTemplate().setCacheQueries(true); List result= query.list(); getHibernateTemplate().setCacheQueries(false); return result; may i know when i do manual "createSQLQuery" how to use cacheQuery? the above doesnt cache the result. show_sql still showing every request get from database

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  • bashscript for file search and replace!

    - by D3orn
    Hey I try to write a littel bash script. This should copy a dir and all files in it. Then it should search each file and dir in this copied dir for a String (e.g @ForTestingOnly) and then this save the line number. Then it should go on and count each { and } as soon as the number is equals it should save againg the line number. = it should delete all the lines between this 2 numbers. I'm trying to make a script which searchs for all this annotations and then delete the method which is directly after this ano. Thx for help...

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  • Sort an object by an other one.

    - by kevinb92
    Here's the deal : I have Publication objets in my application. I also have Vote objet. I can add votes on publication. A vote is defined like this, forOrAgainst, LinkedPublication, date, author etc etc... I want to sort Publication list by number of vote. What is the best way to link them ? Should i return a hashmap ? a treeset ? How do i add votes to publication. It's kinda messy in my brain now...

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