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• java.net.SocketTimeoutException: Read timed out

  - by Rafael Soto

  Hi Folks, I have an application with client server architecture. The client use Java Web Start with Java Swing / AWT and the sert uses HTTP server / Servlet with Tomcat. The communication is made from the serialization of objects, create a ObjectOutput serializes a byte array and send to the server respectively called the ObjectInputStream and deserializes. The application follows communicating correctly to a certain time of concurrency where starting to show error "SocketException read timeout". The erro happens when the server invoke the method ObjectInputStream.getObject() in my servlet doPost method. The tomcat will come slow and the errors start to decrease server response time until the crash time where i must restart the server and after everything works. Someone went through this problem ?

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• What way to use the CGContext to draw is suitable?

  - by Tattat

  I know that the CGContext cannot call it to draw directly, and it needs to fill the drawing logic in the drawInContext, and call the CGContext to draw using "setNeedsDisplay", so, I designed a cmd to execute, but it cause some problems... like this : http://stackoverflow.com/questions/2617827/why-i-cant-draw-in-a-loop-using-uiview-in-iphone I think the CGContext is very different from my previous programming experience....(I used HTML5 canvas, that allow me add more details, after I draw, so do the Java Swing) Actually, I want to know what is the suitable to implement these kind of thing in Apples' programmer mind. Thz.

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• What should a Java/SOA developer be able to do?

  - by Regular Joe

  Hello community. I got assigned the task to list the activities a Java Developer should be able to perform and create an estimate about the time it would take. I've came up with the following: S = Small complexity M = Medium complexity H = High complexity 1d = 1 day Create JDBC CRUD backend ( S=1d, M=5d, H=10d ) Create JSP/Servlet frontend for a CRUD app ( S=1d, M=10d, H=20d ) Create Swing desktop frontend ( S=1d, M=15d, H=30d) Create ORM based CRUD ... Create Webapp fronend with webframework ... This is thought for a Java "enterprise" developer. The other profile I have is SOA Developer, but I could not pass beyond: Create webservice ( S=.5d, M=2d, H=7d ) Q.- What other activities should a Java Developer be able to do? Q.- What activities should a SOA Developer be able to do? Please, help me with this, I know this is in the limit of the kind of questions that could be asked here, but I really need a little push on this, and I don't want to go to Yahoo Answers for this.

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• Java: how to register a listener that listen to a JFrame movement

  - by cocotwo

  How can you track the movement of a JFrame itself? I'd like to register a listener that would be called back every single time JFrame.getLocation() is going to return a new value. Here's a skeleton that compiles and runs, what kind of listener should I add so that I can track every JFrame movement on screen? import javax.swing.*; public class SO { public static void main( String[] args ) throws Exception { SwingUtilities.invokeAndWait( new Runnable() { public void run() { final JFrame jf = new JFrame(); final JPanel jp = new JPanel(); final JLabel jl = new JLabel(); updateText( jf, jl ); jp.add( jl ); jf.add( jp ); jf.pack(); jf.setVisible( true ); } } ); } private static void updateText( final JFrame jf, final JLabel jl ) { jl.setText( "JFrame is located at: " + jf.getLocation() ); jl.repaint(); } }

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• JTable's and DefaultTableModel's row indexes lose their synchronization after I sort JTable

  - by Stefanos Kargas

  JAVA NETBEANS // resultsTable, myModel JTable resultsTable; DefaultTableModel myModel; //javax.swing.table.DefaultTableModel myModel = (DefaultTableModel) resultsTable.getModel(); // event of clicking on item of table String value = (String) myModel.getValueAt(resultsTable.getSelectedRow(), columnIndex) I use JTable and DefaultTableModel to view a table of various info and I want to get a value of a certain column of the selected index of the table. The code I wrote above works fine except when: I use the sort of the GUI (click on the field name I want to sort on the table) The table is properly sorted but after that when I select a row, it gets the value of the row that was there before the sort. This means that after sorting (using the JTable's GUI) the 'myModel' and 'resultsTable' objects have different row indexes. How do I synchronize those two?

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• How to stringfy a swig matrix object in python

  - by leo

  Hi, I am using swig wrapper of openbabel(written in C++, and supply a python wrapper through swig) Below i just use it to read a molecule structure file and get the unitcell property of it. import pybel for molecule in pybel.readfile('pdb','./test.pdb'): unitcell = molecule.unitcell print unitcell |.. |.. The unitcell has function CellMatrix(), unitcell.GetCellMatrix() <22 the OpenBabel::matrix3x3 is something like : 1 2 3 4 5 6 7 8 9 i am wondering how to print out the contents of the matrix3*3 . I have tried str and repr with it. Any general way to stringfy the contents of a matrix wrapped by swing in python ? thanks

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• What to learn in my summer holidays?

  - by rgksugan

  I am finishing my graduate and i am into a sotware company. I am a fresher and have some knowledge in Java and JEE. I can program servlets and JSP and have also developed some Swing applications. I dont have that much knowledge in web frameworks. I want to use my holidays usefully at the same time i dont want to spend a lot of time into programming. What can i learn. Suggest me something usefull. I prefer learning some programming tips/algorithms.

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• Viewing HTML inside Applet without using JEditorPane

  - by Tom

  Hello, I have a small (500kb) swing applet that displays very simple/limited set of small HTML page(s) inside it with JEditorPane, however this does not seem to work 100% fluently, some customers get a blank page displayed without any java exceptions. The page works OK from my machine. I need a more reliable way to show HTML page to all our users. Any ideas if there is a small + free class to use instead of JEditorPane OR is there an easy fix to make it more reliable (non blank) private JEditorPane m_editorPane = new JTextPane(); m_editorPane.setEditable( false); m_editorPane.setBackground(new Color(239 ,255, 215)); m_editorPane.setBounds(30,42,520,478 ); m_editorPane.setDoubleBuffered(true); m_editorPane.setBorder(null); m_editorPane.registerEditorKitForContentType("text/html", "com.xxxxx.SynchronousHTMLEditorKit"); m_editorPane.setPage(ResourceLoader.getURLforDataFile(param.trim()));

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• Script stops working on HSQLDB 1.9.0-rc6

  - by jacklty

  DROP VIEW V1 IF EXISTS; DROP TABLE T1 IF EXISTS; CREATE TABLE T1 (id INT, name VARCHAR(32), age int); CREATE VIEW V1 AS (SELECT * FROM T1 WHERE age < 21); I have no problem to execute the SQL statement above in one JDBC statement or on the SWING Manager from HSQLDB. Now it stops working on 1.9.0-rc6. This is error message I got - "user lacks privilege or object not found: T1 / Error Code: -5501 / State: 42501" Does anyone know what have changed in 1.9.0-XX which made it not working? Thanks

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• change the class loading order google app engine java

  - by Shekhar

  I am trying to create an application on google app engine using struts2. Struts2 internally uses freemarker .One of the Freemarker framework classes suppose X internally uses a class javax.swing.Treenode which is not in google app engine jre white list. Now in order to run my application i created a new class X in the same package structure as it was in freemarker framework and copied the class to WEB-INF classes.Then When i run my application it run fine. The problem is that i want to take out the class X from my application sourcecode and move it to newly created jar and place it in WEB-INF/lib folder. So that i can reuse the code in multiple project and my code remains clean of the freemarker code. But when i run the application it picks the old class X from the original freemarker framework.As a result i get ClassNotFoundException. Can anyone provide any help such that i can change the ClassLoading order such that my jar containing X class loads first.

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• What is the point of JComboBox's getSelectedItem()?

  - by Chris Cooper

  I just read the JavaDoc for JComboBox (I promise I have a life... I wasn't reading through for fun. =P), and I think the problems I'm having with my program can be attributed to the getSelectedItem() method. The documentation says: Returns the current selected item. If the combo box is editable, then this value may not have been added to the combo box with addItem, insertItemAt or the data constructors. If you can't get values that were added with those methods or with the constructor, of what use is the method? And how can I get the value from an "editable" JComboBox? Link to JavaDoc: http://java.sun.com/j2se/1.4.2/docs/api/javax/swing/JComboBox.html#getSelectedItem()

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• populate a comboBox in Griffon App dynamically

  - by kulkarni

  I have 2 comboBoxes in my View of Griffon App (or groovy swingBuilder) country = comboBox(items:country(), selectedItem: bind(target:model, 'country', value:model.country), actionPerformed: controller.getStates) state = comboBox(items:bind(source:model, sourceProperty:'states'), selectedItem: bind(target:model, 'state', value:model.state)) The getStates() in the controller, populates @Bindable List states = [] in the model based on the country selected. The above code doesn't give any errors, but the states are never populated. I changed the states from being List to a range object(dummy), it gives me an error MissingPropertyException No such property items for class java.swing.JComboBox. Am I missing something here? There are a couple of entries related to this on Nabble but nothing is clear. The above code works if I had a label instead of a second comboBox.

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• Java - SwingWorker - Can we call one SwingWorker from other SwingWorker instead of EDT

  - by Yatendra Goel

  I have a SwingWorker as follows: public class MainWorker extends SwingWorker(Void, MyObject) { : : } I invoked the above Swing Worker from EDT: MainWorker mainWorker = new MainWorker(); mainWorker.execute(); Now, the mainWorker creates 10 instances of a MyTask class so that each instance will run on its own thread so as to complete the work faster. But the problem is I want to update the gui from time to time while the tasks are running. I know that if the task was executed by the mainWorker itself, I could have used publish() and process() methods to update the gui. But as the tasks are executed by threads different from the Swingworker thread, how can I update the gui from intermediate results generated by threads executing tasks.

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• Exception thrown while working with JTabbedPane

  - by Halo

  I'm using a JTabbedPane in my application and I listen to its changes with ChangeListener so that I can know which tab is currently selected. So my stateChanged method is; public void stateChanged(ChangeEvent e) { currentPageIndex = jTabbedPane.getSelectedIndex(); } But while I'm adding new tabs to the JTabbedPane it throws an ArrayIndexOutOfBoundsException in the method above, I don't know why. Some suggested for a similar case that this is a bug http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4873983, but as you'll see some says the solution is to work with Swing from EventDispatchThread. What does it mean, do they mean the SwingUtilities.invokeLater thing? Can someone show me how I can modify my stateChanged method accordingly to avoid the exception?

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• Call a function by its name, given from string java

  - by Joao

  Hello, I would like to be able to call a function based on its name provided by a string. Something like public void callByName(String funcName){ this.(funcName)(); } I have searched a bit into lambda funcions but they are not supported. I was thinking about going for Reflection, but I am a bit new to programming, so I am not so familiar with the subject. This whole question was brought up on my java OOP class, when I started GUI (Swing, swt) programming, and events. I found that using object.addActionCommand() is very ugly, because I would later need to make a Switch and catch the exact command I wanted. I would rather do something like object.attachFunction(btn1_click), so that it would call the btn1_click function when the event click was raised. Thank you Joao

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• How should objects be in a Java game.

  - by Gabriel A. Zorrilla

  EDIT: i just deleted the entire post and reformulated the question to be more generic. I want to do a simple strategy game: map, units. Map: one class. Units: another class, self drawn. Simple questions: How does an unit should redraw itself on the map. A unit should be a JPanel or similar Swing component (just to be able to manage them as an entity with its own mousehandlers) or can be another thing, without neglecting the fact that it should be an autonomous object with its own action handlers and fields. Is this map-units model correct of a simple game that would help me to learn in a fun way Java and OOP fundamentals. Thats it!

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• [java bean]hibernate Session breaks a java bean?

  - by blow

  Hi all, i have a simple JPanel bean in my projects, now i want to drag my panel bean class into my jframe. My panel bean class is like this: public class BeanPanel extends javax.swing.JPanel { /** Creates new form BeanPanel */ public BeanPanel () { initComponents(); Session session=HibernateUtil.getSessionFactory().openSession(); } This code seem to break the bean: Session session=HibernateUtil.getSessionFactory().openSession(); When i try to drag the class into my JFrame bean i had this error message: This component cannot be instantiated. Please make sure it is a JavaBeans Component If i comment it all works fine. What is the reason of this? Thanks.

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• Keyboard input for a game in Java

  - by hmp

  I'm writing a game in Java, right now it's Swing + JOGL - a JFrame with a GLCanvas. I handle input using keyPressed etc. events (jframe.addKeyListener(...)) and it doesn't seem to work properly: when I have 3+ keys down at the same time, they don't register properly after the window loses, then regains focus, input stops working completely... What am I doing wrong? Is there a better way of handling keyboard input in Java? (I'd rather not switch to another library, like LWJGL... unless I have no choice).

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• Simple cross platform GUI app

  - by Joe Cannatti

  I would like to know if there is any way that I could build a very simple GUI app (it doesn't even have to look good) that will run on a fresh install of Windows Vista and OS X with no other installations needed by the user. I would perfer not to use Java (just out of personal programming preference). I will use it though, if it is the only way. Specically, I am wondering if I can write a swing app with Scala or Groovy and run in on windows without them having to install anything. Sorry if this is a silly question, I am a Obj-C developer by trade.

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• Colouring JTree's TreeNodes

  - by Amadan

  I have a JTree which I give objects that implement the TreeNode interface, and a custom TreeModel to display them (not using DefaultMutableTreeNode). I would like to change the text colour of some nodes. I can't find anything in the docs, except javax.swing.tree.DefaultTreeCellRenderer.setTextNonSelectionColor(Color newColor), but it will change everything indiscriminately, and I only need it for some nodes (specifically, broken links, i.e. nodes whose corresponding files can't be found on the disk, should be greyed out, the rest should be default). Can it be done, and how?

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• What should a Java/SOA developer be able to do?

  - by Regular Joe

  I got assigned the task to list the activities a Java Developer should be able to perform and create an estimate about the time it would take. I've came up with the following: Create JDBC CRUD backend ( S=1d, M=5d, H=10d ) Create JSP/Servlet frontend for a CRUD app ( S=1d, M=10d, H=20d ) Create Swing desktop frontend ( S=1d, M=15d, H=30d) Create ORM based CRUD etc. Create Webapp fronend with webframework etc Where.. S = Small complexity M = Medium complexity H = High complexity 1d = 1 day This is thought for a Java "enterprise" developer. The other profile I have is SOA Developer, but I could not pass beyond: Create webservice ( S=.5d, M=2d, H=7d ) Q.- What other activities should a Java Developer be able to do? Q.- What activities should a SOA Developer be able to do? Please, help me with this, I know this is in the limit of the kind of questions that could be asked here, but I really need a little push on this, and I don't want to go to Yahoo Answers for this.

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• Java Framework Choice Question.

  - by Sarang

  We do have many frameworks available in Java. Struts, Swing, JSF 2.0, Spring etc are used as per their priority. Actually, I don't know how many they are as well! But, as I am fresher to Java, even learning after their architecture, I cannot decide which framework can be used with what type of Projects ! Also, I am confused with mixed use of framework like Spring + JSF. What is the benefit to it ? Another thing making me confusing is about the UI components available in market. Like, we do have Primefaces, Ice-faces, MyFaces, Rich-faces. They may or may not have been supporting AJAX in-built. They may contains some bugs as well. What is best choice for Framework + UI component that can directly provide a best feet solution for any project ?

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• Spring MVC with a rich client framework

  - by ziggy

  I have several applications that are structured as follows DataComponent WebComponent ThickClientComponent WebServices The DataComponent has all the functionality required to access the application's data so it contains the DAOs and the JPA entities. The other three modules are: WebComponent - A spring MVC application that uses the DataComponent for data acccess ThickClientComponent- A Swing application that uses the DataComponent for data access WebServices - A SOAP based services that also uses the DataComponent. All three projets have the DataComponent as a dependeny in their Maven POM file. I would like to use a rich client framework like RichFaces, icefaces or primefaces as i need to be able to use the rich components are available in rich client frameworks (i.e. trees, panel, drag and drop etc). I have looked around and i cant seem to find an example where a Spring MVC application uses a rich client platform. Is it possible? Are the rich client platforms a framework meaning that i have to use either Spring MVC or the rich client platform but not both? The DataComponent module is spring based.

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• TileGroup does not fill the container

  - by Luo Yong

  I put a TileGroup in a BorderContainer and set the width to 100%, but the content in the TileGroup did not fill the parent container, it leaves a big chunk of blank on the right part. The code is: <s:BorderContainer width="100%" height="100%"> <s:TileGroup width="100%" requestedColumnCount="2"> <s:Button> button1 </s:Button> <s:Button> button2 </s:Button> <s:Button> button3 </s:Button> </s:TileGroup> </s:BorderContainer> and the result is like this: http://i.minus.com/iN39P7Us4cBm1.png The width is already set to 100% but it does not work. Is there any way to make the TileGroup fill the container like GridLayout does in Java swing? http://www.java2s.com/Code/JavaImages/GridLayoutPane.PNG Thank you very much.

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• How to add a margin to a CheckedListBox in .NET?

  - by Xanatos

  I'm writing an windforms application using .NET (actually IronPython, but that's not relevant), and I have a CheckedListBox object in my GUI. It's working fine, it has about 20 items in a multicolumn layout. But I can't figure out how to give the thing a nice internal margin--I want to insert around 20 or 30 pixels of whitespace around the top, bottom, left, and right edges of the checkboxes. To be clear, I want the whitespace to appear between the border of the CheckedListBox and the Checkboxes inside it, not outside the whole component. Hopefully this is an easy answer, and I'm just missing it cause I'm new to programming in windows. If its not possible, I guess that'd be good to know too, so I don't waste anymore time with it. (If I were doing this in Swing (Java) I would be looking to set the Insets on my component, or maybe build up a compound border with some empty space in it.)

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