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  • Hibernate ManyToMany and superclass mapping problem

    - by Jesus Benito
    Hi all, I need to create a relation in Hibernate, linking three tables: Survey, User and Group. The Survey can be visible to a User or to a Group, and a Group is form of several Users. My idea was to create a superclass for User and Group, and create a ManyToMany relationship between that superclass and Survey. My problem is that Group, is not map to a table, but to a view, so I can't split the fields of Group among several tables -which would happen if I created a common superclass-. I thought about creating a common interface, but mapping to them is not allowed. I will probably end up going for a two relations solution (Survey-User and Survey-Group), but I don't like too much that approach. I thought as well about creating a table that would look like: Survey Id | ElementId | Type ElementId would be the Group or UserId, and the type... the type of it. Does anyone know how to achieve it using hibernate annotations? Any other ideas? Thanks a lot

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  • Blob object not working properly even though the class is seralized

    - by GustlyWind
    I have class which is seralized and does convert a very large amount of data object to blob to save it to database.In the same class there is decode method to convert blob to the actual object.Following is the code for encode and decode of the object. private byte[] encode(ScheduledReport schedSTDReport) { byte[] bytes = null; try { ByteArrayOutputStream bos = new ByteArrayOutputStream(); ObjectOutputStream oos = new ObjectOutputStream(bos); oos.writeObject(schedSTDReport); oos.flush(); oos.close(); bos.close(); //byte [] data = bos.toByteArray(); //ByteArrayOutputStream baos = new ByteArrayOutputStream(); //GZIPOutputStream out = new GZIPOutputStream(baos); //XMLEncoder encoder = new XMLEncoder(out); //encoder.writeObject(schedSTDReport); //encoder.close(); bytes = bos.toByteArray(); //GZIPOutputStream out = new GZIPOutputStream(bos); //out.write(bytes); //bytes = bos.toByteArray(); } catch (Exception e) { _log.error("Exception caught while encoding/zipping Scheduled STDReport", e); } decode(bytes); return bytes; } /* * Decode the report definition blob back to the * ScheduledReport object. */ private ScheduledReport decode(byte[] bytes) { ByteArrayInputStream bais = new ByteArrayInputStream(bytes); ScheduledReport sSTDR = null; try { ObjectInputStream ois = new ObjectInputStream(bais); //GZIPInputStream in = new GZIPInputStream(bais); //XMLDecoder decoder = new XMLDecoder(in); sSTDR = (ScheduledReport)ois.readObject();//decoder.readObject(); //decoder.close(); } catch (Exception e) { _log.error("IOException caught while decoding/unzipping Scheduled STDReport", e); } return sSTDR; } The problem here is whenver I change something else in this class means any other method,a new class version is created and so the new version the class is unable to decode the originally encoded blob object. The object which I am passing for encode is also seralized object but this problem exists. Any ideas thanks

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  • Handling Character Encoding in URI on Tomcat

    - by ZZ Coder
    On the web site I am trying to help with, user can type in an URL in the browser, like following Chinese characters, http://localhost:8080?a=?? On server, we get GET /a=%E6%B5%8B%E8%AF%95 HTTP/1.1 As you can see, it's UTF-8 encoded, then URL encoded. We can handle this correctly by setting encoding to UTF-8 in Tomcat. However, sometimes we get Latin1 encoding on certain browsers, http://localhost:8080?a=ß turns into GET /a=%DF HTTP/1.1 Is there anyway to handle this correctly in Tomcat? Looks like the server has to do some intelligent guessing. We don't expect to handle the Latin1 correctly 100% but anything is better than what we are doing now by assuming everything is UTF-8. The server is Tomcat 5.5. The supported browsers are IE 6+, Firefox 2+ and Safari on iPhone.

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  • Super class variables not printing through sub class

    - by Abhishek Singh
    Can u tell me why this code is not displaying any result on the console. class employee { protected String name; protected double salary; protected String dob; public employee(String name, double salary, String dob) { this.name = name; this.salary = salary; this.dob = dob; } public employee(String name, double salary) { this.name = name; this.salary = salary; } } public class Manage extends employee { String dept1; public Manage(String name, double salary, String dob, String dept1) { super(name, salary, dob); this.dept1 = dept1; } public Manage(String name, double salary, String dept1) { super(name, salary); this.dept1 = dept1; } public static void main(String args[]) { employee e = new employee("Vikas", 122345); employee e2 = new employee("Vikas", 122345, "12-2-1991"); Manage m = (Manage) new Manage("Vikas", 122345, "Sales"); Manage m2 = new Manage("Vikas", 122345, "12-2-1991", "sales"); m.display(); m2.display(); } public void display() { System.out.println("Name " + name); System.out.println("Salary " + salary); System.out.println("Birth " + dob); System.out.println("Department " + dept1); } }

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  • Playing around with Eclipse features - Project files are now hidden?

    - by Daddy Warbox
    I don't even remember how, but somehow I managed to make all of my project's source files hidden in Eclipse's Package and Project Explorer panels. Go figure. 'Show Filtered Children (alt+click)' temporarily reveals the files, and only in Package Explorer can I double-click to reopen them from this view. They go back into hiding after I select another item, though. Plus, now I'm getting other annoyances, such as all of the folded non-hidden trees altogether expanding when I click on any item, and the entire file folder tree of my project now being shown in these panels (including my .svn subversion folders... which shouldn't be any of Eclipse's business, presently). Long story short, my Package/Project Explorers' just blew up on me, and I want to know how to fix this. Thanks in advance. P.S. What's a good guide I can use to learn my way around this silly contraption, anyway?

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  • make a variable final in Android Studio

    - by user3664685
    When I try to make the variable A(String) equal to e(Which comes from a Plain Text) this appears in the line of the error(In the code below): Variable 'e' is accessed from within inner class, needs to be declared final. I don't know how to make 'e' final. public void MORSE(View v) { EditText e=(EditText)findViewById(R.id.text); TextView T=(TextView)findViewById(R.id.translation); Button TRAD=(Button) findViewById(R.id.translate); TRAD.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view){ String A; A=""+e; //HERE IS THE ERROR. } }); }

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  • How do I get an imageview to rotate while translating in Android?

    - by Ravedave
    I am trying to make an imageview that rotates while sliding across the screen. I setup a rotate animation for 180 degrees, and it works by itself. I setup a translate animation and it works by itself. When I combine them I get an imageview that makes a big spiral. I would like the imageview to rotate around the center of the imageview while being translated. AnimationSet animSet = new AnimationSet(true); //Translate upwards and to the right. TranslateAnimation anim = new TranslateAnimation( Animation.ABSOLUTE, 0.0f, Animation.ABSOLUTE, +80.0f, Animation.ABSOLUTE, 0.0f, Animation.ABSOLUTE, -100.0f ); anim.setInterpolator(new DecelerateInterpolator()); anim.setDuration(400); animSet.addAnimation(anim); //Rotate around center of Imageview RotateAnimation ranim = new RotateAnimation(0f, 180f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); //, 200, 200); // canvas.getWidth() / 2, canvas.getHeight() / 2); ranim.setDuration(400); ranim.setInterpolator(new DecelerateInterpolator()); animSet.addAnimation(ranim); imageBottom.startAnimation(animSet);

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  • Testing SocketChannel NIO

    - by hotzen
    Hello, I just wrote some NIO-code and wonder how to stress-test my implementation regarding SocketChannel.write(ByteBuffer) not able to write the whole byte-buffer SocketChannel.read(ByteBuffer) reading the data in chunks into ByteBuffer are there some simple linux-utilities like telnet to open a ServerSocket with some buffering-options?

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  • How to find the first declaring method for a reference method

    - by Oliver Gierke
    Suppose you have a generic interface and an implementation: public interface MyInterface<T> { void foo(T param); } public class MyImplementation<T> implements MyInterface<T> { void foo(T param) { } } These two types are frework types. In the next step I want allow users to extend that interface as well as redeclare foo(T param) to maybe equip it with further annotations. public interface MyExtendedInterface extends MyInterface<Bar> { @Override void foo(Bar param); // Further declared methods } I create an AOP proxy for the extended interface and intercept especially the calls to furtherly declared methods. As foo(…) is no redeclared in MyExtendedInterface I cannot execute it by simply invoking MethodInvocation.proceed() as the instance of MyImplementation only implements MyInterface.foo(…) and not MyExtendedInterface.foo(…). So is there a way to get access to the method that declared a method initially? Regarding this example is there a way to find out that foo(Bar param) was declared in MyInterface originally and get access to the accoriding Method instance? I already tried to scan base class methods to match by name and parameter types but that doesn't work out as generics pop in and MyImplementation.getMethod("foo", Bar.class) obviously throws a NoSuchMethodException. I already know that MyExtendedInterface types MyInterface to Bar. So If I could create some kind of "typed view" on MyImplementation my math algorithm could work out actually.

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  • Date Sorting - Latest to Oldest

    - by Erika Szabo
    Collections.sort(someList, new Comparator<SomeObject>() { public int compare(final SomeObject object1, final SomeObject object2) { return (object1.getSomeDate()).compareTo(object2.getSomeDate()); }} ); Would it give me the objects with latest dates meaning the list will contain the set of objects with latest date to oldest date?

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  • What are the pros and cons of using an in memory DB rather than a ThreadLocal

    - by Pangea
    We have been using ThreadLocal so far to carry some data so as to not clutter the API. However below are some of issues of using thread local that which I don't like: 1) Over the years the data items being carried in thread local has increased 2) Since we started using threads (for some light weight processing), we have also migrating these data to the threads in the pool and copying them back again I am thinking of using an in memory DB for these (we doesn't want to add this to the API). I wondering if this approach is good. What are the pros and cons? thx in advance.

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  • Wicket Drag and drop functionality for adding an image

    - by Marcel
    I'm making a wicket app that can manage some options for a cashdesk app. One of the options is to change the image of a selected Product. The user(manager) can choose from the already present images in the database (SQL) when this option is selected, or add a new image if the desired image is not present. Don't mention the test names and awesome images (it's still in test-fase) I prefer to see the adding of an image achieved by Drag and Drop html5 demo [dnd-upload] (From the desktop into the browser) I'm currently using Wicket-6.2.0 and wicket-dnd 0.5.0 and i can't seem to get this working! All examples I can find are from wicket 2.x or lower. It is possible to use drag and drop in Wicket-6.2, but how do I achieve this? There seems to be some DraggableBehavior in wicket? Any help is welcome! [UPDATE] Upgraded to wicket-dnd 0.6

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  • presentation layer to go with apache torque

    - by ed1t
    I'm planning on using Apache torque as my object-relational mapper (ORM), and I was wondering if anybody has any suggestions around what framework to use for presentation layer with torque. maybe Spring? I don't know if this helps, but my application is basically going to be bunch of forms to input data and based on that data, I'll generate reports in form of a graph or chart.

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  • How to download file from inside Seam PDF

    - by Shervin
    Hello. In out project we are creating a pdf by using seam pdf and storing that pdf in the database. The user can then search up the pdf and view it in their pdf viewer. This is a small portion of the code that is generated to pdf: <p:html> <a:repeat var="file" value="#{attachment.files}" rowKeyVar="row"> <s:link action="#{fileHandler.downloadById()}" value="#{file.name}" > <f:param name="fileId" value="#{file.id}"/> </s:link> </a:repeat> When the pdf is rendered, a link is generated that points to: /project/skjenkebevilling/status/status_pdf.seam?fileId=42&actionMethod=skjenkebevilling%2Fstatus%2Fstatus_pdf.xhtml%3AfileHandler.downloadById()&cid=16 As you can see this link doesnt say much, and the servletpath seems to be missing. If I change /project with the servletpath localhost:8080/saksapp/skjenkebevilling/status/status_pdf.seam?fileId=42&actionMethod=skjenkebevilling%2Fstatus%2Fstatus_pdf.xhtml%3AfileHandler.downloadById%28%29&cid=16 Than the download file dialog appears. So my question is, does anyone know how I can input the correct link? And why this s:link doesnt seem to work? If I cannot do that, then I will need to somehow do search replace and edit the pdf, but that seems like a bit of a hack. (This is running under JBoss) Thank you for your time....

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  • Java_swt in eclipse

    - by Ken
    Can someone tell me where I can find the executeable "java_swt"? I see multiple sites that say it is embedded in eclipse, and other sites say it is shipped with Mac swt drops. I have the zip file for a mac called "swt-3.5M6-carbon-macosx.zip" and i have the eclipse IDE installed on my test mac machine and windows machine. But i cannot find this executeable which i need to run an swt app smoothly on mac os x. Any help would be appreciated. Thanks.

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  • B-Tree Revision

    - by stan
    Hi, If we are looking for line intersections (horizontal and vertical lines only) and we have n lines with half of them vertical and no intersections then Sorting the list of line end points on y value will take N log N using mergesort Each insert delete and search of our data structue (assuming its a b-tree) will be < log n so the total search time will be N log N What am i missing here, if the time to sort using mergesort takes a time of N log N and insert and delete takes a time of < log n are we dropping the constant factor to give an overal time of N log N. If not then how comes < log n goes missing in total ONotation run time? Thanks

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  • Coding Conventions - Naming Enums

    - by Walter White
    Hi all, Is there a document describing how to name enumerations? My preference is that an enum is a type. So, for instance, you have an enum Fruit{Apple,Orange,Banana,Pear, ... } NetworkConnectionType{LAN,Data_3g,Data_4g, ... } I am opposed to naming it: FruitEnum NetworkConnectionTypeEnum I understand it is easy to pick off which files are enums, but then you would also have: NetworkConnectionClass FruitClass Also, is there a good document describing the same for constants, where to declare them, etc.? Walter

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