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How to configure Hibernate database reverse engineering tool to map database table relation as a ent

- by Piotr Kochanski

Is it possible to configure Hibernate reverse engineering and code generation tool in such a way that one-to-many relation between tables is mapped to entities inheritance instead of enrites relation? I have Person table and Employee table, which are related with the foreign key (Person contains basic information, Employee the rest). In my Java code I would like this relation mapped to inheritance Employee extends Person. This can be done by hand, but maybe I missed some custom configuration parameter that I can use. I couldn't find any official documentation - docs link on RedHat Hibernate page (http://www.hibernate.org/5.html#A10) is broken...

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Double Buffering with awt

- by DDP

Is double buffering (in java) possible with awt? Currently, I'm aware that swing should not be used with awt, so I can't use BufferStrategy and whatnot. If double buffering is possible with awt, do I have to write the buffer by hand? Unlike swing, awt doesn't seem to have the same built-in double buffering capability. If I do have to write the code by hand, is there a good tutorial to look at? Or is it just easier/advisable for a novice programmer to use swing instead? Sorry about the multi-step question. Thanks for your time :)

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How to use atmosphere-spade-server in combination with atmosphere-pubsub.war

- by Alfred

I would like to play with atmosphere-spade-server.jar + pubsub.war. First of I have maven installed, but to be honest Maven is kind of new to me. Could please someone please explain me how to use it correctly. What I have tried Download atmosphere-spade-server + pubsub.war from there site. java -jar atmosphere-spade-server-0.6.0-20100329.142039-1.jar -a atmosphere-pubsub.war curl http://localhost:8080/atmosphere-pubsub/myAtmosphereTopic <html><body><h1>Resource Not> Found</h1></body></html> I would just have a guided tour of how to use Atmosphere.

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Programming Contest Question: Counting Polyominos

- by Martijn Courteaux

Hi, An example question for a programming contest was to write a program that finds out how much polyominos are possible with a given number of stones. So for two stones (n = 2) there is only one polyominos: XX You might think this is a second solution: X X But it isn't. The polyominos are not unique if you can rotate them. So, for 4 stones (n = 4), there are 7 solutions: X X XX X X X X X X XX X XX XX XX X X X XX X X XX The application has to be able to find the solution for 1 <= n <=10 PS: Using the list of polyominos on Wikipedia isn't allowed ;) EDIT: Of course the question is: How to do this in Java, C/C++, C#

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How to use Map element as text of a JComboBox

- by llm

I am populating a JComboBox (using addItem()) with all the elements of a collection. Each element in the collection is a HashMap (so its a ComboBox of Hashmaps..). My question is - Given that I need each item to be a HashMap how do I set the text to apear in the combobox on the GUI? It needs to be the value of a certain key in the map. Normally if I am populating a combobox with my own type, I would just overide the toString() method...but I am not sure how to acheive this since I am using a Java HashMap. Any ideas (if possible, without implementing my own HashMap)? Update: It seems like there isn't anyway to avoid having the object int the JComboBox overide toString() if I want custom functionality..I wish there was a way to (1) specify the objects to be loaded into the JComboBox and (2) specify how these objects are to appear in the GUI.

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J2ME app to access incoming call - Where to start?

- by Jay

Here's my requirement: I often receive calls from unidentified numbers on my mobile phones. I would like an application which would use a reference list like this, and show me the carrier name and the area of origin along with the number on screen. Mobile make : Sony Ericsson Model : C902 Operating System: Propreitary J2ME: MIDP 2.0 Here are my questions: Is it possible to do something like this? I have installed a lot of java apps on my mobile, and all of them have to be launched seperately, can be run in the background, but they never seem to access anything native. If it is possible, which area of J2Me should I start with, for creating an application that achieves the above requirement? If it is not possbile, what are my alternatives?

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What processor is javax.xml.transform Using?

- by Jeremy Witmer

I've implented a simple webapp that transforms XML based on an XSTL stylesheet. It works fine on all the Windows servers I've deployed it on (to Tomcat), but on all Linux systems, I get a compile error on the XSLT. As best I can tell, it's because Java 1.6 isn't using the same processor behind javax.xml.transform. On the one Linux system, it's org.apache.xalan.xslt, version 2.4. What I can't figure out is how to generically figure out what any given system is using behind javax.xml.transform. Or, if anyone has any hints on what else I might do to figure out the problem, that'd be good, too.

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Vim Editor is very smart?

- by Narek

I am programming in C++ or Java. So I want to use Vim editor, because it is very flexible. I have heard that I can configure the Vim editor to be able to go from object to the definition from function to the definition from class name to the definition Do we have any professional Vim-er that could tell me how exactly to configure Vim for that? Thanks in advance. P.S. In case readers will consider this question is not connected with programming, I would say that this is improving speed of programming. So it is a help to the programmer. So please don't close this question. EDIT: Also I would like to know how vim works with code completion and can vim hint the list of methods that are available for the certain object? If yes, then I would like to know how to configure these options too?

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Validate an XML File Against Multiple Schema Definitions

- by Jon

I'm trying to validate an XML file against a number of different schemas (apologies for the contrived example): a.xsd b.xsd c.xsd c.xsd in particular imports b.xsd and b.xsd imports a.xsd, using: <xs:include schemaLocation="b.xsd"/> I'm trying to do this via Xerces in the following manner: XMLSchemaFactory xmlSchemaFactory = new XMLSchemaFactory(); Schema schema = xmlSchemaFactory.newSchema(new StreamSource[] { new StreamSource(this.getClass().getResourceAsStream("a.xsd"), "a.xsd"), new StreamSource(this.getClass().getResourceAsStream("b.xsd"), "b.xsd"), new StreamSource(this.getClass().getResourceAsStream("c.xsd"), "c.xsd")}); Validator validator = schema.newValidator(); validator.validate(new StreamSource(new StringReader(xmlContent))); but this is failing to import all three of the schemas correctly resulting in cannot resolve the name 'blah' to a(n) 'group' component. I've validated this successfully using Python, but having real problems with Java 6.0 and Xerces 2.8.1. Can anybody suggest what's going wrong here, or an easier approach to validate my XML documents?

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how do i use a .dat file as a model for an entity in minecraft?

- by user1835502

the entity does not have to do anything, just stand there like a statue, or it doesn't have to be an entity at all, just so the .dat file renders in minecraft i saw this http://pastebin.com/jP4diLJ9 in a java file that came with a .exe, and in the .exe you can choose one of the .dat files and it will show you it as a model, i also asked on minecraft forums and someone said it was possible but i have no idea how maybe has something to do with this try { FileOutputStream fileoutputstream = new FileOutputStream("./Models/"+id+".dat"); fileoutputstream.write(b, 0, b.length); fileoutputstream.close(); } catch(Throwable _ex) {} or if(i 0) {//grabs all models System.out.println("Sending request for Model: "+i); addRequest( 7, i); byte b[] = pack.unpack(download().buffer); if(pack.unpacked) { savemodel(i,b); System.out.println("Model Saved"); }else{ System.out.println("Model Grabbing Complete"); break;

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Jquery Retrieving data from webpage and entering it in database.

- by user279321

Hello Everyone. I am new to Jquery. I want to read specific data(some div's only) from a webpage and store it in my database. Now I am not able to do so as load functions loads the data into the current page id. My goal is to read specific data and store them in database. So which Jquery function should I use for this? if someone can throw some light on it, it would be really helpful for me. I am using JSP,MySQL,Java.

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libriaries on Android

- by Will

In native development, you can produce libraries - .so, .dll etc - that other libraries and programs can share. In Java, you can put your code in a JAR in the classpath and other programs and libraries can use it. So how can you do modular programs in Android? I get the impression from the documentation that each APK is a self-contained island. Can different APKs share code? And how does installation work when you have these external dependencies? Can you specify that you rely on library that is not in your APK and get it installed too? If you can't have 'dynamic linking', can you have 'static linking' by developing your shared code and somehow putting the equiv of a JAR into each APK that requires it?

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Benefit of outputting JSON as opposed to plain HTML

- by Franco

Hey guys, Just wondering which is best here. I want to output data from a table in my DB then put a lot of this data into a html table on the fly on my page. Im working with Java on the server side. Basically I pull the results form the DB and have the raw data..just what next? There is a chance I may want to take data from multiple tables in order to combine it into one table for my site. I retrieve the results of the query from the DB, now do i create a text from it in the form of json which i can parse as json using jquery upon the return of the object to my browser?(kind of a sub question of this question: Is just using a stringbuilder the correct way to make a json object to output?) Or.. Should i build the HTML as a string and output that to the browser instead? Which is better and why? Thanks in advance!

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J2EE: Default values for custom tag attributes

- by Nick

So according to Sun's J2EE documentation (http://docs.sun.com/app/docs/doc/819-3669/bnani?l=en&a=view), "If a tag attribute is not required, a tag handler should provide a default value." My question is how in the hell do I define a default value as per the documentation's description. Here's the code: <%@ attribute name="visible" required="false" type="java.lang.Boolean" %> <c:if test="${visible}"> My Tag Contents Here </c:if> Obviously, this tag won't compile because it's lacking the tag directive and the core library import. My point is that I want the "visible" property to default to TRUE. The "tag attribute is not required," so the "tag handler should provide a default value." I want to provide a default value, so what am I missing? Any help is greatly appreciated.

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Graph database for .NET

- by Antonello

I've been designing an application, based on .NET/Mono framework, which should make an heavy use of the shortest-path in a graph theories and I would like to use a native solution to traverse the nodes of the graph, instead of implementing surrogate solutions which would be hardly maintainable and would massively affect performances. I've found an application which would be perfect for my scope: neo4j. Unfortunately, this application is purely written in Java code and it's not portable to .NET, because of the massive differences between the two architectures. Is anyone out there knows if is it there any port of neo4j or a similar solution for .NET?

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How do I use Criteria to make a join on a date field (in DB2) based on the year.

- by HtmlTableGuru

I have a java.util.Date field in my Object. I would like to use Criteria to select all rows that have a date field with a given year. The SQL would look like the following: SELECT * FROM GAME GM WHERE YEAR(GM.GAME_DATE) = 2010 How can I use Criteria to accomplish this? Thanks in advance. public Collection<Game> getGamesByDate(Date date){ Collection<Game> games = null; try { session.beginTransaction(); Criteria criteria = session.createCriteria(Game.class); criteria .... ... ... games = criteria.list(); } catch (HibernateException e) { e.printStackTrace(); } return games; }

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Netbeans GUI Form corrupted?

- by hubpages-my

I was making a java gui application through netbeans IDE. All was working fine but yesterday when I opened the form in Netbeans, it said that the form had been corrupted and it could only open that form in read-only mode. When I opened that form in read-only mode, I found that the code was incomplete as severals lines of coding wasn't there at the end. Could anybody tell me how to recover the form. The form is perfect in lookwise but the generated code is incomplete. The code is too long to write it again. The Netbeans told me to get help from http://wiki.netbeans.org/FormGuardedBlockError but I didn't find any helpful information there.

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What is a good practice to access class attributes in class methods?

- by Clem

I always wonder about the best way to access a class attribute from a class method in Java. Could you quickly convince me about which one of the 3 solutions below (or a totally different one :P) is a good practice? public class Test { String a; public String getA(){ return this.a; } public setA(String a){ this.a = a; } // Using Getter public void display(){ // Solution 1 System.out.println(this.a); // Solution 2 System.out.println(getA()); // Solution 3 System.out.println(this.getA()); } // Using Setter public void myMethod(String b, String c){ // Solution 1 this.a = b + c; // Solution 2 setA(b + c); // Solution 3 this.setA(b + c); } }

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Send javax.mail.internet.MimeMessage to a recipient with non-ASCII name?

- by phyzome

I am writing a piece of Java code that needs to send mail to users with non-ASCII names. I have figured out how to use UTF-8 for the body, subject line, and generic headers, but I am still stuck on the recipients. Here's what I'd like in the "To:" field: "????????????" <[email protected]>. This lives (for our purposes today) in a String called recip. msg.addRecipients(MimeMessage.RecipientType.TO, recip) gives "?????S]" <[email protected]> msg.addHeader("To", MimeUtility.encodeText(recip, "utf-8", "B")) throws AddressException: Local address contains control or whitespace in string ``=?utf-8?B?IuOCpuOCo+OCreODmuODh+OCo+OCouOBq+OCiOOBhuOBk+OBnSIgPA==?= =?utf-8?B?Zm9vQGV4YW1wbGUuY29tPg==?='' How the heck am I supposed to send this message?

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Speed up multiple JDBC SQL querys?

- by paddydub

I'm working on a shortest path a* algorithm in java with a mysql db. I'm executing the following SQL Query approx 300 times in the program to find route connections from a database of 10,000 bus connections. It takes approx 6-7 seconds to execute the query 300 times. Any suggestions on how I can speed this up or any ideas on a different method i can use ? Thanks ResultSet rs = stmt.executeQuery("select * from connections" + " where Connections.From_Station_stopID ="+StopID+";"); while (rs.next()) { int id = rs.getInt("To_Station_id"); String routeID = rs.getString("To_Station_routeID"); Double lat = rs.getDouble("To_Station_lat"); Double lng = rs.getDouble("To_Station_lng"); int time = rs.getInt("Time"); }

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How useful is a 'pure' MVC implementation?

- by Matt1776

I work at a company that provides custom made 'CRM'-like software. We are currently redesigning/redeveloping the software with the hopes that it will look more modern and be easier to develop and customize for future clients. Currently it takes a long time to customize each new application. There is a presumption that the reason it takes so long is because of the amount of business logic that is present in the 'view' layer. To some extent I can vouch for this being true, but symptoms don't always reliably point out a cause. There was a suggestion that if we just move the business logic to the controller layer and use pure view (we use java J2EE and struts) as in implementing struts tags instead of calling the bean layer and iterating objects right on the jsp - etc etc. Before I start advocating we go forward with this, I wanted to get a feeling for what other people thought. Does a "pure" implementation of the MVC (especially emphasis on decoupling the controller and the view) provide a cleaner, easier to develop and change code base?

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Typed DefaultListModel to avoid casting

- by Thomas R.

Is there a way in java to have a ListModel that only accepts a certain type? What I'm looking for is something like DefaultListModel<String> oder TypedListModel<String>, because the DefaultListModel only implements addElement(Object obj) and get(int index) which returns Object of course. That way I always have to cast from Object to e.g. String and there is no guarantee that there are only strings in my model, even though I'd like to enforce that. Is this a flaw or am I using list models the wrong way?

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How do I send telnet option codes?

- by Matt

I've written a socket listener in Java that just sends some data to the client. If I connect to the server using telnet, I want the server to send some telnet option codes. Do I just send these like normal messages? Like, if I wanted the client to print "hello", I would do this: PrintWriter out = new PrintWriter(clientSocket.getOutputStream()); out.print("hello"); out.flush(); But when I try to send option codes, the client just prints them. Eg, the IAC char (0xff) just gets printed as a strange y character when I do this: PrintWriter out = new PrintWriter(clientSocket.getOutputStream()); out.print((char)0xff); out.flush();

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Embedded MongoDB when running integration tests

- by seanhodges

My question is a variation of this one. Since my Java Web-app project requires a lot of read filters/queries and interfaces with tools like GridFS, I'm struggling to think of a sensible way to simulate MongoDB in the way the above solution suggests. Therefore, I'm considering running an embedded instance of MongoDB alongside my integration tests. I'd like it to start up automatically (either for each test or the whole suite), flush the database for every test, and shut down at the end. These tests might be run on development machines as well as the CI server, so my solution will also need to be portable. Can anyone with more knowledge on MongoDB help me get idea of the feasibility of this approach, and/or perhaps suggest any reading material that might help me get started? I'm also open to other suggestions people might have on how I could approach this problem...

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Maven 2: How to package current project version in a WAR file?

- by Tom van Zummeren

I am using Maven 2 to build my Java project and I am looking for a way to present the current version number of the pom.xml to the user (using a Servlet or JSP for example). As far as I can see, the best way would be that Maven packages the version number as a text file into the WAR. This allows me to read the version from that file and present it the way I want. Does anyone know of a plugin that can do something like that for me? Maybe the WAR plugin can be configured to do so? Or maybe using some other approach all together?

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