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• Using AWT components inside a JInnerFrame (for JDesktopPane)

  - by Jack

  Hello, is there a way to hack bugs related to adding an AWT component (in my case a PApplet, so a processing language sketch) inside a JInternalFrame? It works but not as intended, since it flickers and dragging the frame causes repaint issues.. reading around it seems that, althrough it's possible to mix heavyweight (AWT) and lightweight (Swing) components some problems seem to be unavoidable.. is it true? Thanks!

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• Setting log level of message at runtime in slf4j

  - by scompt.com

  When using log4j, the Logger.log(Priority p, Object message) method is available and can be used to log a message at a log level determined at runtime. We're using this fact and this tip to redirect stderr to a logger at a specific log level. slf4j doesn't have a generic log() method that I can find. Does that mean there's no way to implement the above?

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• The "is" in JUnit 4 assertions

  - by Space_C0wb0y

  Is there any semantic difference between writing assertThat(object1, is(equalTo(object2))); and writing assertThat(object1, equalTo(object2))); ? If not, I would prefer the first version, because it reads better. Are there any other considerations here?

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• Am I using EJBs properly?

  - by kgrad

  I am using a JEE6 stack including JPA 2.0, JSF 2.0, EJB 3.1 etc. The way my architecture is setup is the following: I have JPA annotated DAOs using hibernate as my JPA provider. I have JSF Managed beans which correspond to my facelet/xhtml pages. I have EJBs that handle all of my database requests. My XHTML pages have JSF EL which make calls to my Managed beans. My managed beans contain references to my DAO entities which are managed by EJBs. For example, I have a user entity which is mapped to a db table. I have a user EJB which handles all CRUD operations that return Users. I have a page that edits a user. The highlevel workflow would be: navigate to user edit page - EL calls a method located in the managed bean that loads a user. The method calls userEJB.loadUser(user) from the EJB to get the user from the database. The user is edited and submit - a function is called in the managed bean which calls a function in the EJB to save the user. etc. I am running into issues accessing my data within my JSF pages using EJBs. I am having a lot of problems with lazy initialization errors, which I believe is due to how I have set things up. For example, I have a Client entity that has a List of users which are lazily loaded. In order to get a client I call a method in my EJB which goes to the database, finds a client and returns it. Later on i wish to access this clients list of users, in order to do so i have to go back to the EJB by calling some sort of method in order to load those users (since they are lazily loaded). This means that I have to create a method such as public List<User> getUserListByClient(Client c) { c = em.merge(c); return c.getUserList(); } The only purpose of this method is to load the users (and I'm not even positive this approach is good or works). If i was doing session management myself, I would like just leave the session open for the entire request and access the property directly, this would be fine as the session would be open anyway, there seems to be this one extra layer of indirection in EJBs which is making things difficult for me. I do like EJBs as I like the fact that they are controlled by the container, pooled, offer transaction management for free etc. However, I get the feeling that I am using them incorrectly, or I have set up my JSF app incorrectly. Any feedback would be greatly appreciated. thanks,

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• copying the request header from request object to urlConnection object

  - by Bunny Rabbit

  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub URL url = new URL("http://localhost:8080/testy/Out"); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setDoOutput(true); connection.setRequestMethod("POST"); PrintWriter out=response.getWriter(); for(Enumeration e=request.getHeaderNames();e.hasMoreElements();){ Object o=e.nextElement(); String value=request.getHeader(o.toString()); out.println(o+"--is--"+value+"<br>"); connection.setRequestProperty((String) o, value); } connection.connect(); } i wrote the above code in a servlet to post form so some alternate locations than this servlet,but its not working.is it okay to use connection.setRequestProperty to set the header fields to what they are in the incoming request to servlet.

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• How to convet to 16 bit binary

  - by ayush

  Hi i want to convert a long integer to binary but the problem is i want a fixed 16 bit binary result after conversion like if i convert 2 to 16 bit binary it should give me 0000000000000010 as ans can anyone help me ?

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• Looking for a regular expression to identify hard coded magic numbers in source code

  - by Brian

  A frequent issue in code reviews is whether a numeric value should be hard-coded in the code or not. Does anyone know of a nice regular expression that can catch 'magic numbers' in code like: int overDue = 30; Money fee = new Money(5.25D); without also getting a ton of false positives like for loop initialization code? for (int i = 0; i < array.length; i++) { }

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• why cookie.getMaxAge() = -1?

  - by wavelet

  i have a test like this : cookie.jsp: <html> <head> </head> <body> <% String cookieName="SNS"; Cookie cookie=new Cookie(cookieName, "maxAgeTest"); cookie.setMaxAge(60*60); response.addCookie(cookie); %> </body> </html> and read.jsp is : <html> <head> </head> <body> <table border=1> <tr><td>Name</td><td>value</td></tr> <% Cookie cookies[]=request.getCookies(); Cookie sCookie=null; String svalue=null; String sname=null; int sage ; for(int i=0;i<cookies.length;i++) { sCookie=cookies[i]; svalue=sCookie.getValue(); sname=sCookie.getName(); sage=sCookie.getMaxAge(); %> <tr><td><%=sname%></td><td><%=svalue%></td><td><%=sage%></td></tr> <% } %> </table> </body> </html> but the result is : Name value maxAge JSESSIONID DB3561A47B37FCA8CA25EA04B80A26C7 -1 SNS maxAgeTest -1 why the maxAge is -1 ? and t test IE8,Chrome5,Safari ,the result same

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• Handling asynchronous responses

  - by James P.

  I'm building an FTP client from scratch and I've noticed that the response codes aren't immediate (which is no surprise). What would be a good approach for getting the corresponding code to a command? Below is an example of the output of Filezilla server. The response code is the three digits near the end of each line. (000057) 23/05/2010 19:43:10 - (not logged in) (127.0.0.1)> Connected, sending welcome message... (000057) 23/05/2010 19:43:10 - (not logged in) (127.0.0.1)> 220-FileZilla Server version 0.9.12 beta (000057) 23/05/2010 19:43:10 - (not logged in) (127.0.0.1)> 220-written by Tim Kosse ([email protected]) (000057) 23/05/2010 19:43:10 - (not logged in) (127.0.0.1)> 220 Please visit http://sourceforge.net/projects/filezilla/ (000057) 23/05/2010 19:43:10 - (not logged in) (127.0.0.1)> user anonymous (000057) 23/05/2010 19:43:10 - (not logged in) (127.0.0.1)> 331 Password required for anonymous

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• What is the purpose of Managers / Transactions?

  - by maxdj

  I'm building a spring application for the first time. I'm running into lots of problems with concurrency, and I suspect that there is something wrong with the way I'm managing the backend. The only difference I can see between my backend code and examples I've seen are manager classes. In my code, I have my model (managed by hibernate) and my DAOs on top of that to do CRUD/searching/etc on the models. In example code I have looked at, they never use the DAO directly. Instead, they use manager classes that call the DAOs indirectly. To me, this just seems like pointless code duplication. What are these manager classes for? I've read that they wrap my code in "transactions," but why would I want that?

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• Why can I not register a PropertyEditor for String in Spring MVC?

  - by Tom Tucker

  I'm using Spring 3.0.3. I've enabled the default ConversionService by adding this line to my Spring configuration XML. <mvc:annotation-driven/> I'm also using custom PropertyEditor's for certain data types, so I've registered them for corresponding data types like the following and they work fine. webDataBinder.registerCustomEditor(Date.class, new MyPropertyEditor()); I have a custom tag library that extends Spring's Form tag library, and I can acess these PropertyEditor's through getPropertyEditor() of AbstractDataBoundFormElementTag. What I don't understand is that I can't register a custom PropertyEditor for String for some reason. The following wouldn't work. webDataBinder.registerCustomEditor(String.class, new MyPropertyEditor()); When I do getPropertyEditor(), it always returns a ConvertingPropertyEditorAdapter, instead of MyPropertyEditor. Is this a bug? EDIT: I realized that I didn't do some stuff right. Spring works just fine.

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• How to use SLF4J Log4jLoggerAdapter

  - by David Wong

  I'm deploying an enterprise application on Weblogic 8.1 which has log4j 1.2.8 on it's classpath. I'm getting the following error with SLF4J 1.6.1: SLF4J versions 1.4.0 and later requires log4j 1.2.12 or later http://www.slf4j.org/codes.html#log4j_version Above link recommends using Log4jLoggerAdapter. I've changed Logger logger = LoggerFactory.getLogger(HelloWorld.class); logger.info("Hello World"); to Log4jLoggerAdapter logger = (Log4jLoggerAdapter) LoggerFactory.getLogger(HelloWorld.class); logger.info("Hello World"); However, I'm still encountering the error. Any advice on how to correctly implement this? Thanks

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• Regular Expression avoiding characters up to code 255

  - by Mark

  Dear Masters! Is it possible to ensure, that only characters with codes between 0 and 255 will be accepted by regular expression, but all with the codes up to 256 not? Thank you!

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• Epoch is not epoch if do a new Date(0L). Why ?

  - by Antoine Claval

  My problem is pretty straigtforward explained : if i do this : public class Main { public static void main(String[] args) throws Exception { Date d = new Date(0L ); System.out.println(d); } } I get the following output : Thu Jan 01 01:00:00 CET 1970 According to the doc, i was expecting : Thu Jan 01 00:00:00 CET 1970 I would like was going wrong... EDIT : Indeed, i read the doc too fast. I sould have Thu Jan 01 00:00:00 GMT 1970 So, how can i force the use of GMT, and ignore all local time ?

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• create TableModel and populate jTable dynamically

  - by Julia

  Hi all! I want to store the results of reading lucene index into jTable, so that I can make it sortable by different columns. From index I am reading terms with different measures of their frequencies. Table columns are these : [string term][int absFrequency][int docFrequency][double invFrequency] So i in AbstractTableModel I can define column names, but i dont know how to get the Object[][]data with results from the following method: public static void FrequencyMap(Directory indexDir) throws Exception { List<Object>redoviLista = new ArrayList<Object>(); //final Map<String,TermRow> map = new TreeMap<String,TermRow>(); List<String>termList = new ArrayList<String>(); IndexReader iReader = IndexReader.open(indexDir); FilterIndexReader fReader = new FilterIndexReader(iReader); int numOfDocs = fReader.numDocs(); TermEnum terms = fReader.terms(); while (terms.next()){ Term term = terms.term(); String termText = term.text(); termList.add(termText); //Calculating the frequencies int df = iReader.docFreq(term); double idf = 0.0F; idf = Math.log10((double) numOfDocs / df); double tfidf = (df*idf); //Here comes important part Object oneTableRow[] = {termText, df, idf, tfidf}; redoviLista.add(jedanRed); // So i thaught to store them into list, and then later to copy into table, but didnt manage } iReader.close(); // So I need something like this, and i Neeed this array to be stored out of this method Object[][]data = new Object[redoviLista.size()][]; for (int i = 0; i < data.length; i++) { data[i][0] = redoviLista.get(i); } So I am kindda stuck here to proceed to implement AbstractTableModel and populate and display this table .... :/ Please help!

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• Unreachable statement when using return in finally?

  - by abson

  this compiles class ex1 { public int show() { try { int a=10/10; return 10; } catch(ArithmeticException e) { System.out.println(e); } finally { System.out.println("Finally"); } System.out.println("hello"); return 20; } } on the other hand this doesn't class ex15 { public int show() { try { int a=10/0; return 10; } catch(ArithmeticException e) { System.out.println(e); } finally { System.out.println("Finally"); return 40; } System.out.println("hello"); return 20; } } and gives unreachable statement System.out.println("hello"); error. why is it so?

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• "The left hand side of an assignment must be a variable" due to extra parentheses

  - by polygenelubricants

  I know why the following code doesn't compile: public class Main { public static void main(String args[]) { main((null)); // this is fine! (main(null)); // this is NOT! } } What I'm wondering is why my compiler (javac 1.6.0_17, Windows version) is complaining "The left hand side of an assignment must be a variable". I'd expect something like "Don't put parentheses around a method invokation, dummy!", instead. So why is the compiler making a totally unhelpful complaint about something that is blatantly irrelevant? Is this the result of an ambiguity in the grammar? A bug in the compiler? If it's the former, could you design a language such that a compiler would never be so off-base about a syntax error like this?

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• Netbeans jar file icon problems

  - by Erma

  I finally found how to make an exe project in Netbeans, so a jar file and execute it from the DESKTOP. The only problem I have ocurred is that after I open the jar file and login with my username and password the button icons are not shown, if I put a string it appears but if I put the image it doesn't appear. So,I had to restore this code: JButton btnNew = new JButton(new ImageIcon("new.gif")); JButton btnUpdate = new JButton(new ImageIcon("NotePad.gif")); JButton btnDelete = new JButton(new ImageIcon("delete.gif")); JButton btnSearch = new JButton(new ImageIcon("find.gif")); and put this one: JButton btnNew = new JButton("ADD"); JButton btnUpdate = new JButton("Update"); JButton btnDelete = new JButton("Delete"); JButton btnSearch = new JButton("Search"); It now works but I would like to have the icons please. Any idea?

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• Android popup style activity which sits on top of any other apps

  - by RenegadeAndy

  What I want to create is a popup style application. I have a service in the background - something arrives on the queue and i want an activity to start to inform the user - very very similar to the functionality of SMSPopup app. So I have the code where something arrives on the queue and it calls my activity. However for some reason the activity always shows on top of the originally started activity instead of just appearing on the main desktop of the android device. As an example: I have the main activity which is shown when the application is run I have the service which checks queue I have a popup activity. When i start the main activity it starts the service - I can now close this. I then have something on the queue and it creates the popup activity which launches the main activity with the popup on top of it :S How do I stop this and have it behave as i want... The popup class is : package com.andy.tabletsms.work; import com.andy.tabletsms.tablet.R; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.Button; import android.widget.PopupWindow; import android.widget.TextView; import android.widget.Toast; public class SMSPopup extends Activity implements OnClickListener{ public static String msg; @Override public void onCreate(Bundle bundle){ super.onCreate(bundle); // Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_LONG).show(); this.setContentView(R.layout.popup); TextView tv = (TextView)findViewById(R.id.txtLbl); Intent intent = getIntent(); if (intent != null){ Bundle bb = intent.getExtras(); if (bb != null){ msg = bb.getString("com.andy.tabletsms.message"); } } if(msg == null){ msg = "LOLOLOL"; } tv.setText(msg); Button b = (Button)findViewById(R.id.closeBtn); b.setOnClickListener(this); } @Override public void onClick(View v) { this.finish(); } } and I call the activity from a broadcast receiver which checks the queue every 30 seconds or so : if(main.msgs.size()0){ Intent testActivityIntent = new Intent(context.getApplicationContext(), com.andy.tabletsms.work.SMSPopup.class); testActivityIntent.putExtra("com.andy.tabletsms.message", main.msgs.get(0)); testActivityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); context.startActivity(testActivityIntent); } The layout is here : http://pastebin.com/F25u6wdM

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• print matrix in dialog box

  - by Edan

  Hello, I'm having a little difficulty to print a matrix array on dialog box. The matrix is integer and as far as i understood i need to change it into string? anyway, here's the code: public void print_Matrix(int row, int column) { for (int i = 0; i <= row; i++) { for (int j = 0; j <= column; j++) { JOptionPane.showMessageDialog(null, matrix_Of_Life); } } what I need to do in order to print array into dialog box? thanks.

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• OSGI on google app engine?

  - by Patrick Cornelissen

  I am evaluating several technologies for an open source app for the google app engine. I'm searching for information regarding OSGI on googles app engine. I have found Lemmon but it seems to be a dead project. The last checkin was in mid 2009... :-/ There is also a eclipse blog entry from april 2009, but it's not a real success story. Has anyone successfully used OSGI in a GAE app?

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• Generating an xml document: JSP or Servlet ?

  - by EugeneP

  This [servlet or jsp] must return an XML document [for future processing by my web-app]. That is not intended for end-users. What is a better design: write a JSP or an XML ?

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• width of the bar in Jfreechart

  - by Harish

  Is there a way to adjust the width of the bars in a Barchart.I create my chart with the following code. final JFreeChart chart = ChartFactory.createBarChart("Report", // chart title "Date", // domain axis label "Number", // range axis label dataset, // data PlotOrientation.VERTICAL, // orientation true, // include legend true, // tooltips? false // URLs? );

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• "org.json.JSONArray implements Serializable": What's the best option to achieve this?

  - by Daxon

  I am using Grails Webflow, what ever object I pass to a view, it must be Serialized. My domain models "implement Serializable", so they work. The problem is when I get a response from a WebService. It is of the org.json.JSONArray class. I just want to pass the whole Array over to the view yet it doesn't implement Serializable, so it fails, Any thoughts on how I can pass this, or my best option? Can I just edit the source of the org.json library and make every class "imp Serializable"? Or process the result into Domain objects that do "imp Serializable"

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• Reflection: cast an object to subclass without use instaceof

  - by Fabrizio

  I have this simple interface/class: public abstract class Message { } public class Message1 extends Message{ } public class Message2 extends Message{ } And an utility class: public class Utility { public void handler(Message m){ System.out.println("Interface: Message"); } public void handler(Message1 m){ System.out.println("Class: Message1"); } public void handler(Message2 m){ System.out.println("Class: Message2"); } } Now, the main class: public static void main(String[] args) { Utility p=new Utility(); Message1 m1=new Message1(); p.handler(m1); Message m=(Message) m1; p.handler(m); } The output is Class: Message1 Interface: Message I would that p.handler(m) call the method p.handler(m:Message1) I don't want use the "manual" command instanceof because I have many cases: if(m instance of Message1) p.handler((Message1)m) else if (m instanceof Message2) p.handler((Message2)m) ... If I call m.getClass() I obtain "mypackage.Message1", so the subclass and not the superclass. I try with this code (use reflection): p.handler(m.getClass().cast(m)); But the output is Interface: Message So, this is my problem. I would do a runtime cast of superclass object to subclassobject without use the "code command" istanceof. I would a right command like this: p.handler((m.getclass)m); How can I obtain it? It's possible? Thank in advance. Fabrizio

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