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• How to get child container reference in View Model

  - by niels-verkaart

  Hello, I´m trying to share a Data Service (Entity Manager) wrapped in a Repository from a ViewModel (called 'AVM') in Module A to a ViewModel (called 'BVM') in Module B, and I can't get this working. We use PRISM/Unity 2.0 This is my scenario: A user may open multiple Customer screens (composite view as mini shell) each with another customer (unit of work). We realize this using child containers. Each child container resolves it's own repository with its own Entity manager (the repository is a singleton within the child container). This is done in module A. The main shell has a main region manager, and each Customer screen with its childcontainer creates a scoped region. In each customer screen there is a View 'AV' (connected to ViewModel 'AVM') with a SubRegion (tab control) registered as 'SubRegion'. We create this with a 'Screen Factory' In Module B we have a Customer Orders in View 'BV' and ViewModel 'BVM'. In the constructor of Module B we get the main container by injection. In the initialize method we resolve the (main) region manager and register View 'BV' with it. In the constructor of View 'BV' a ViewModel 'BVM' is injected/created. Now this works, but the ViewModel 'BVM' cannot get the child container. It only get the main container. Is this doable, or do I have to do this another way? Thanks, Niels

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• Slow insert speed in Postgresql memory tablespace

  - by Prashant

  Hi, I have a requirement where I need to store the records at rate of 10,000 records/sec into a database (with indexing on a few fields). Number of columns in one record is 25. I am doing a batch insert of 100,000 records in one transaction block. To improve the insertion rate, I changed the tablespace from disk to RAM.With that I am able to achieve only 5,000 inserts per second. I have also done the following tuning in the postgres config: Indexes : no fsync : false logging : disabled Other information: - Tablespace : RAM - Number of columns in one row : 25 (mostly integers) - CPU : 4 core, 2.5 GHz - RAM : 48 GB I am wondering why a single insert query is taking around 0.2 msec on average when database is not writing anything on disk (as I am using RAM based tablespace). Is there something I am doing wrong? Help appreciated. Prashant

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• Eclipse IDE's Hello World Cheatsheet seems to have a mistake

  - by Sean

  Hey guys, Just a warning: I'm completely new to Java and am trying to teach myself Android programming. I installed the Eclipse IDE today and tried to walk through the first Java Hello World "cheat sheet," and it didn't work! I was really quite surprised. When it asked me to select the checkbox to create the main() method, there wasn't anything on-screen that looked like a checkbox with "main()" or "method" next to it, so I guessed that maybe what they meant was the "Modifiers" radio button. So I left that checked for "public." It didn't compile and I got red X's next to every folder in my Package Explorer. Has anybody else had this problem? Thanks!

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• Spring security access with multiple roles

  - by Evgeny Makarov

  I want to define access for some pages for user who has one of following roles (ROLE1 or ROLE2) I'm trying to configure this in my spring security xml file as following: <security:http entry-point-ref="restAuthenticationEntryPoint" access-decision-manager-ref="accessDecisionManager" xmlns="http://www.springframework.org/schema/security" use-expressions="true"> <!-- skipped configuration --> <security:intercept-url pattern="/rest/api/myUrl*" access="hasRole('ROLE1') or hasRole('ROLE2')" /> <!-- skipped configuration --> </security:http> I've tried various ways like: access="hasRole('ROLE1, ROLE2')" access="hasRole('ROLE1', 'ROLE2')" access="hasAnyRole('[ROLE1', 'ROLE2]')" etc but nothing seems to be working. I'm keep getting exception java.lang.IllegalArgumentException: Unsupported configuration attributes: or java.lang.IllegalArgumentException: Failed to parse expression 'hasAnyRole(['ROLE1', 'ROLE2'])' how should it be configured? Thanks

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• Why can't Doctrine retrieve my model data?

  - by scottm

  So, I'm trying to use Doctrine to retrieve some data. I have some basic code like this: $conn = Doctrine_Manager::connection(CONNECTION_STRING); $site = Doctrine_Core::getTable('Site')->find('00024'); echo $site->SiteName; However, this keeps throwing a SQL error that 'column siteid does not exist'. When I look at the exception the SQL query is this (you can see the error is that the inner_tbl alias for siteid is set to s__siteid, so querying inner_tabl.siteid is what's broken): SELECT TOP 1 [inner_tbl].[siteid] AS [s__siteid] FROM (SELECT TOP 1 [s].[siteid] AS [s__siteid], [s].[name] AS [s__name], [s].[address] AS [s__address], [s].[city] AS [s__city], [s].[zip] AS [s__zip], [s].[state] AS [s__state], [s].[region] AS [s__region], [s].[callprocessor] AS [s__callprocessor], [s].[active] AS [s__active], [s].[dateadded] AS [s__dateadded] FROM [Sites] [s] WHERE ([s].[siteid] = '00024') ) AS [inner_tbl] Why is the query being generated this way? Could it be the way the Yaml schema is laid out? Site: connection: 0 tableName: Sites columns: siteid: type: string(5) fixed: true unsigned: false primary: true autoincrement: false name: type: string(300) fixed: false unsigned: false notnull: true primary: false autoincrement: false address: type: string(100) fixed: false unsigned: false notnull: false primary: false autoincrement: false city: type: string(100) fixed: false unsigned: false notnull: false primary: false autoincrement: false zip: type: string(5) fixed: false unsigned: false notnull: false primary: false autoincrement: false state: type: string(2) fixed: true unsigned: false notnull: true primary: false autoincrement: false region: type: integer(4) fixed: false unsigned: false notnull: true default: (5) primary: false autoincrement: false callprocessor: type: integer(4) fixed: false unsigned: false notnull: true primary: false autoincrement: false active: type: integer(1) fixed: false unsigned: false notnull: true primary: false autoincrement: false dateadded: type: timestamp(16) fixed: false unsigned: false notnull: true default: (getdate()) primary: false autoincrement: false

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• JSF : able to do mass update but unable to update a single row in a datatable

  - by nash

  I have a simple data object: Car. I am showing the properties of Car objects in a JSF datatable. If i display the properties using inputText tags, i am able to get the modified values in the managed bean. However i just want a single row editable. So have placed a edit button in a separate column and inputText and outputText for every property of Car. the edit button just toggles the rendering of inputText and outputText. Plus i placed a update button in a separate column which is used to save the updated values. However on clicking the update button, i still get the old values instead of the modified values. Here is the complete code: public class Car { int id; String brand; String color; public Car(int id, String brand, String color) { this.id = id; this.brand = brand; this.color = color; } //getters and setters of id, brand, color } Here is the managed bean: import java.util.ArrayList; import java.util.List; import javax.faces.bean.ManagedBean; import javax.faces.bean.RequestScoped; import javax.faces.component.UIData; @ManagedBean(name = "CarTree") @RequestScoped public class CarTree { int editableRowId; List<Car> carList; private UIData myTable; public CarTree() { carList = new ArrayList<Car>(); carList.add(new Car(1, "jaguar", "grey")); carList.add(new Car(2, "ferari", "red")); carList.add(new Car(3, "camri", "steel")); } public String update() { System.out.println("updating..."); //below statments print old values, was expecting modified values System.out.println("new car brand is:" + ((Car) myTable.getRowData()).brand); System.out.println("new car color is:" + ((Car) myTable.getRowData()).color); //how to get modified row values in this method?? return null; } public int getEditableRowId() { return editableRowId; } public void setEditableRowId(int editableRowId) { this.editableRowId = editableRowId; } public UIData getMyTable() { return myTable; } public void setMyTable(UIData myTable) { this.myTable = myTable; } public List<Car> getCars() { return carList; } public void setCars(List<Car> carList) { this.carList = carList; } } here is the JSF 2 page: <?xml version='1.0' encoding='UTF-8' ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core"> <h:head> <title>Facelet Title</title> </h:head> <h:body> <h:form id="carForm" prependId="false"> <h:dataTable id="dt" binding="#{CarTree.myTable}" value="#{CarTree.cars}" var="car" > <h:column> <h:outputText value="#{car.id}" /> </h:column> <h:column> <h:outputText value="#{car.brand}" rendered="#{CarTree.editableRowId != car.id}"/> <h:inputText value="#{car.brand}" rendered="#{CarTree.editableRowId == car.id}"/> </h:column> <h:column> <h:outputText value="#{car.color}" rendered="#{CarTree.editableRowId != car.id}"/> <h:inputText value="#{car.color}" rendered="#{CarTree.editableRowId == car.id}"/> </h:column> <h:column> <h:commandButton value="edit"> <f:setPropertyActionListener target="#{CarTree.editableRowId}" value="#{car.id}" /> </h:commandButton> </h:column> <h:column> <h:commandButton value="update" action="#{CarTree.update}"/> </h:column> </h:dataTable> </h:form> </h:body> </html> However if i just keep the inputText tags and remove the rendered attributes, i get the modified values in the update method. How can i get the modified values for the single row edit?

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• Table Design For SystemSettings, Best Model

  - by Chris L

  Someone suggested moving a table full of settings, where each column is a setting name(or type) and the rows are the customers & their respective settings for each setting. ID | IsAdmin | ImagePath ------------------------------ 12 | 1          | \path\to\images 34 | 0          | \path\to\images The downside to this is every time we want a new setting name(or type) we alter the table(via sql) and add the new (column)setting name/type. Then update the rows(so that each customer now has a value for that setting). The new table design proposal. The proposal is to have a column for setting name and another column for setting. ID | SettingName | SettingValue ---------------------------- 12 | IsAdmin        | 1 12 | ImagePath   | \path\to\images 34 | IsAdmin        | 0 34 | ImagePath   | \path\to\images The point they made was that adding a new setting was as easy as a simple insert statement to the row, no added column. But something doesn't feel right about the second design, it looks bad, but I can't come up with any arguments against it. Am I wrong?

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• App engine datastore - query on Enum fields.

  - by Gopi

  I am using GAE(Java) with JDO for persistence. I have an entity with a Enum field which is marked as @Persistent and gets saved correctly into the datastore (As observed from the Datastore viewer in Development Console). But when I query these entities putting a filter based on the Enum value, it is always returning me all the entities whatever value I specify for the enum field. I know GAE java supports enums being persisted just like basic datatypes. But does it also allow retrieving/querying based on them? Google search could not point me to any such example code. Details: I have printed the Query just before being executed. So in two cases the query looks like - SELECT FROM com.xxx.yyy.User WHERE role == super ORDER BY key desc RANGE 0,50 SELECT FROM com.xxx.yyy.User WHERE role == admin ORDER BY key desc RANGE 0,50 Both above queries return me all the User entities from datastore in spite of datastore viewer showing some Users are of type 'admin' and some are of type 'super'.

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• Dividing a Video into Frames and Sending Frames to Streams

  - by Amit Kumar

  I have to implement a "demux" that divides up a video stream and sends each frame to one of multiple output streams in a round-robin fashion. I am trying to implement the demux as follows. The video stream contains one frame after another and is implemented via a java InputStream. Each frame has a frame header followed by the image data. The demux needs to read the frame header to know the size of the image data. The image data can then be redirected from the input video stream to one of the output streams (java OutputStream). My problem is about how to implement this redirection. That is, connect the InputStream to the OutputStream to send N bytes (here N is the size of the image data), and then disconnect and connect to another OutputStream. I have seen the interface of PipedInputStream etc but they do not seem to implement the disconnection.

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• Memory leak at Autorelease pool in Iphone sdk

  - by monish

  Hi guys, I am getting leak at [pool release]; My code here is: #pragma mark UISearchBarDelegate delegate methods - (void)performSearch:(UISearchBar *)aSearchBar { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; artistName= [aSearchBar.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]; if ([artistName length] > 0) { [UIApplication sharedApplication].networkActivityIndicatorVisible = YES; LyricsAppDelegate* appDelegate = (LyricsAppDelegate*) [ [UIApplication sharedApplication] delegate]; artistsList=[appDelegate doSearch:artistName ]; [theTableView reloadData]; [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; [aSearchBar resignFirstResponder]; } else { [aSearchBar resignFirstResponder]; } [NSThread exit]; [pool release]; } - (void)searchBarSearchButtonClicked:(UISearchBar *)aSearchBar { @try { [NSThread detachNewThreadSelector:@selector(performSearch:) toTarget:self withObject:aSearchBar]; [aSearchBar resignFirstResponder]; } @catch (NSException * e) { NSLog(@"\n caught an exception"); } @finally { } } Here I am getting leak at [pool release]; in performSearch method. How can I solve this. Anyone's help will be much appreciated. Thank you, Monish.

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• RSpec mocking a nested model in Rails - ActionController problem

  - by emson

  Hi All I am having a problem in RSpec when my mock object is asked for a URL by the ActionController. The URL is a Mock one and not a correct resource URL. I am running RSpec 1.3.0 and Rails 2.3.5 Basically I have two models. Where a subject has many notes. class Subject < ActiveRecord::Base validates_presence_of :title has_many :notes end class Note < ActiveRecord::Base validates_presence_of :title belongs_to :subject end My routes.rb file nests these two resources as such: ActionController::Routing::Routes.draw do |map| map.resources :subjects, :has_many => :notes end The NotesController.rb file looks like this: class NotesController < ApplicationController # POST /notes # POST /notes.xml def create @subject = Subject.find(params[:subject_id]) @note = @subject.notes.create!(params[:note]) respond_to do |format| format.html { redirect_to(@subject) } end end end Finally this is my RSpec spec which should simply post my mocked objects to the NotesController and be executed... which it does: it "should create note and redirect to subject without javascript" do # usual rails controller test setup here subject = mock(Subject) Subject.stub(:find).and_return(subject) notes_proxy = mock('association proxy', { "create!" => Note.new }) subject.stub(:notes).and_return(notes_proxy) post :create, :subject_id => subject, :note => { :title => 'note title', :body => 'note body' } end The problem is that when the RSpec post method is called. The NotesController correctly handles the Mock Subject object, and create! the new Note object. However when the NoteController#Create method tries to redirect_to I get the following error: NoMethodError in 'NotesController should create note and redirect to subject without javascript' undefined method `spec_mocks_mock_url' for #<NotesController:0x1034495b8> Now this is caused by a bit of Rails trickery that passes an ActiveRecord object (@subject, in our case, which isn't ActiveRecord but a Mock object), eventually to url_for who passes all the options to the Rails' Routing, which then determines the URL. My question is how can I mock Subject so that the correct options are passed so that I my test passes. I've tried passing in :controller = 'subjects' options but no joy. Is there some other way of doing this? Thanks...

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• Convert Memory Size (Human readable) into Actual Number (bytes) in Perl

  - by neversaint

  Is there an actual package in CPAN to convert such string: my $string = "54.4M" my $string2 = "3.2G" into the actual number in bytes: 54,400,000 3,200,000,000 And vice versa.

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• Problem facing fetching contacts from yahoo using open Social API

  - by user324929

  Hello there I was trying to get contact list from yahoo for POC. It was documented that the there is need to send a GET request to the URL with the user's ID and returns the contact list in XML format. I tried the same but facing the authentication message 401 from browser, normal console java application and from jsp too I guess I must try it using the open social API package. Can anybody please guide or suggest the solution for this problem if possible please post any code sample for any similar application in JAVA as I found most samples are unclear and in JSON only. Thank You

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• how can we find that this processor supports how much memory?????

  - by Zia ur Rahman

  I have just started the Assembly language programming and in the first lecture our teacher told us about intel 8080 and intel 8085 and he said there was 64k memory with these processor. Now i want to know that how we find this amount of memory with specific processor, for example i have a processor 1.8 Ghz , now how i can find out the amount of memory that can be used with this processor. what i am trying to ask is tell me the method how we can find out this amount of memory?

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• Rails: unable to set any attribute of child model

  - by Bryan Roth

  I'm having a problem instantiating a ListItem object with specified attributes. For some reason all attributes are set to nil even if I specify values. However, if I specify attributes for a List, they retain their values. Attributes for a List retain their values: >> list = List.new(:id => 20, :name => "Test List") => #<List id: 20, name: "Test List"> Attributes for a ListItem don't retain their values: >> list_item = ListItem.new(:id => 17, :list_id => 20, :name => "Test Item") => #<ListItem id: nil, list_id: nil, name: nil> UPDATE #1: I thought the id was the only attribute not retaining its value but realized that setting any attribute for a ListItem gets set to nil. list.rb: class List < ActiveRecord::Base has_many :list_items, :dependent => :destroy accepts_nested_attributes_for :list_items, :reject_if => lambda { |a| a[:name].blank? }, :allow_destroy => true end list_item.rb: class ListItem < ActiveRecord::Base belongs_to :list validates_presence_of :name end schema.rb ActiveRecord::Schema.define(:version => 20100506144717) do create_table "list_items", :force => true do |t| t.integer "list_id" t.string "name" t.datetime "created_at" t.datetime "updated_at" end create_table "lists", :force => true do |t| t.string "name" t.datetime "created_at" t.datetime "updated_at" end end

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• Inverse Logistic Function / Reverse Sigmoid Function

  - by Chanq

  I am currently coding up a fuzzy logic library in java. I have found the equations for all the standard functions - Grade, inverseGrade, Triangle, Trapezoid, Gaussian. However, I can't find the inverse of the sigmoid/ logistic function. The way I have written the logistic function is java is : //f(x) = 1/(1+e(-x)) public double logistic(double x){ return (1/(1+(Math.exp(-x))); } But I can't work out or find the inverse anywhere. My algebraic/calculus abilities are fairly limited, hence why I haven't been able to work out the inverse of the function. Any hints or pointers would be a big help. Thanks

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• How can I use a TreeWalker to dump out the DOM

  - by michael

  Hi, In w3c dom interface, there is DOMTreeWalker to traverse the DOM. I find this example which uses DOMTreeWalker: http://www.java-tips.org/java-se-tips/org.w3c.dom/how-to-traverse-the-dom-tree-using-treewalker-2.html But my question is How can I use the DOMTreeWalk to dump the dom structure and value to a file? i.e. I need to know when a parent start and a parent end so that I can do when I dump the dom to a file (i need to insert after each parent dumps its children: <parent> <child a1="1" a2="2"/> <child a3="1" a4="3"/> <child a5="1" a6="5"/> </parent>

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• I am getting exception in main thread...even when i am handling the exception

  - by fari

  public KalaGame(KeyBoardPlayer player1,KeyBoardPlayer player2) { //super(0); int key=0; try { do{ System.out.println("Enter the number of stones to play with: "); BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); key = Integer.parseInt(br.readLine()); if(key<0 || key>10) throw new InvalidStartingStonesException(key); } while(key<0 || key>10); player1=new KeyBoardPlayer(); player2 = new KeyBoardPlayer(); this.player1=player1; this.player2=player2; state=new KalaGameState(key); } catch(IOException e) { System.out.println(e); } } when i enter an invalid number of stones i get this error Exception in thread "main" InvalidStartingStonesException: The number of starting stones must be greater than 0 and less than or equal to 10 (attempted 22) why isn't the exception handled by the throw i defined at KalaGame.<init>(KalaGame.java:27) at PlayKala.main(PlayKala.java:10)

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• What's the easiest way to get the result of an HTTP GET request in using URL in JRuby

  - by sipwiz

  I'm attempting to build a Tropo Ruby application and I need to retrieve the result of an HTTPS GET. The Tropo platform doesn't have the httpclient Ruby gem so I can't use that. The Ruby engine used is JRuby so a suggestion has been to make use of the Java URL class to do the request. I've played around with it a little bit and I seem to be able to create the URL object ok but am now struggling with how to get the results of executing the request. How do I do it? javaURL = java.net.URL.new svcURL transferResult = javaURL.getContent()

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• Memory leak in Qt signal and slots

  - by Ajay

  Hello, I am running valgrind on my Qt code,and even on successful exit of the application, get the following report from valgrind 8,832 bytes in 92 blocks are still reachable in loss record 12 of 12 at 0x4025390: operator new(unsigned int) (vg_replace_malloc.c:214) ==3339== by 0x4B75F05: QMutex::QMutex(QMutex::RecursionMode) (qmutex.cpp:123) ==3339== by 0x4B77602: QMutexPool::get(void const*) (qmutexpool.cpp:137) ==3339== by 0x4CA0EC2: signalSlotLock(QObject const*) (qobject.cpp:112) ==3339== by 0x4CA3939: QMetaObjectPrivate::connect(QObject const*, int, QObject const*, int, int, int*) (qobject.cpp:2900) ==3339== by 0x4CA5C00: QObject::connect(QObject const*, char const*, QObject const*, char const*, Qt::ConnectionType) (qobject.cpp:2599) I disconnect all signal connections and also delete the objects. The above mentioned leak increases if i increase the amount of signal and slot connections? Can anybody help with this?

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• how to push data from BlazeDS without recieve message from Flex client?

  - by Teerasej

  Hi, everyone I am using BlazeDS for data-push feature in my Flex application project. From the official tutorial, Getting started with BlazeDS, it shows messaging example with producer/consumer from API. but how can I implement server side which doesn't need to be invoke from Flex client, but from within server-side instead. I got some idea but I don't know how to do because I'm a Flex developer, not Java developer, so I think you can help me. In Google, there's a tutorial show about I need to extend ServiceAdapter class in Java-side, which extends Invoke method. Do I need to extend other class instead of this to do what I want? How to configure the message-config.xml to get the result like I describe above?

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• After using modern languages, can C NOT be painful?

  - by Alexandre

  I started my computer engineering course recently and we've been using C for a couple of things. Before starting university, I was doing a lot of web development. I've written a lot of PHP code (yuck!) and for the last year or so Ruby exclusively. aside: I love Ruby, love it! So after a year of heavy Ruby development, is it wrong to think that C should be avoided at all costs unless absolutely necessary? Right now it seems to me I should try to a) get it to run in Ruby b) if it's too slow, try Java c) if it's too slow, use C Is there anyone who jumps straight to C if a VM (Ruby, Java, Python, etc) can be used on the machine and speed is not an issue? In other words, can C NOT be painful?

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• word frequency problem

  - by davit-datuashvili

  hi in programming pearls i have meet following problem question is this:print words in decreasing frequency or as i understand probllem is this suppose there is given string array let call it s words i have taken randomly it does not matter String s[]={"cat","cat","dog","fox","cat","fox","dog","cat","fox}; and we see that string cat occurs 4 times fox 3 times and dog 2 times so result will be such cat fox dog i have following code in java mport java.util.*; public class string { public static void main(String[] args){ String s[]={"fox","cat","cat","fox","dog","cat","fox","dog","cat"}; Arrays.sort(s); int counts; int count[]=new int[s.length]; for (int i=0;i } } or i have sorted array and create count array where i write number of each word in array problem is that somehow index of integer array element and string array element is not same how to do such that print words according tu maximum elements of integer array? please help me

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• Cannot connect to *.dbf file through JDBC drivers

  - by leodali

  i'm trying to connect to *.dbf (dBase III) file on my Java application, running on a Windows Server 2003 system. I'm encountering this error and I cannot really understand the meaning (sources for OdbcJdbc.java seems to be unavailable): [Microsoft][ODBC dBase driver] '(unknown)' is not a valid path error Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); String database = "jdbc:odbc:DRIVER={Microsoft dBase Driver(*.dbf)};DBQ=D:\\dbNeri\\CARISTAT;"; Connection conn = DriverManager.getConnection(database); Statement s = conn.createStatement(); String selTable = "SELECT * FROM CARISTAT"; Does it exists a JDBC driver able to connect to dBase files or do I have to import external libraries to do the magic? Thanks in advance for your help!

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• Why Look and feel is not getting updated properly?

  - by swift

  I’m developing a swing application in which I have an option to change the Look and feel of the application on click of a button. Now my problem is when I click the button to change the theme it’s not properly updating the L&F of my app, say my previous theme is “noire” and I choose “MCWin” after it, but the style of the noire theme is still there Here is sample working code: package whiteboard; import java.awt.GridBagLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.ComponentEvent; import java.awt.event.ComponentListener; import javax.swing.JFrame; import javax.swing.JLayeredPane; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.SwingUtilities; import javax.swing.UIManager; import javax.swing.WindowConstants; public class DiscussionBoard extends JFrame implements ComponentListener,ActionListener { // Variables declaration private JMenuItem audioMenuItem; private JMenuItem boardMenuItem; private JMenuItem exitMenuItem; private JMenuItem clientsMenuItem; private JMenuItem acryl; private JMenuItem hifi; private JMenuItem aero; private JMenuItem aluminium; private JMenuItem bernstein; private JMenuItem fast; private JMenuItem graphite; private JMenuItem luna; private JMenuItem mcwin; private JMenuItem noire; private JMenuItem smart; private JMenuBar boardMenuBar; private JMenuItem messengerMenuItem; private JMenu openMenu; private JMenu saveMenu; private JMenu themesMenu; private JMenuItem saveMessengerMenuItem; private JMenuItem saveWhiteboardMenuItem; private JMenu userMenu; JLayeredPane layerpane; /** Creates new form discussionBoard * @param connection */ public DiscussionBoard() { initComponents(); setLocationRelativeTo(null); addComponentListener(this); } private void initComponents() { boardMenuBar = new JMenuBar(); openMenu = new JMenu(); themesMenu = new JMenu(); messengerMenuItem = new JMenuItem(); boardMenuItem = new JMenuItem(); audioMenuItem = new JMenuItem(); saveMenu = new JMenu(); saveMessengerMenuItem = new JMenuItem(); saveWhiteboardMenuItem = new JMenuItem(); userMenu = new JMenu(); clientsMenuItem = new JMenuItem(); exitMenuItem = new JMenuItem(); setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); setLayout(new GridBagLayout()); setResizable(false); setTitle("Discussion Board"); openMenu.setText("Open"); saveMenu.setText("Save"); themesMenu.setText("Themes"); acryl = new JMenuItem("Acryl"); hifi = new JMenuItem("HiFi"); aero = new JMenuItem("Aero"); aluminium = new JMenuItem("Aluminium"); bernstein = new JMenuItem("Bernstein"); fast = new JMenuItem("Fast"); graphite = new JMenuItem("Graphite"); luna = new JMenuItem("Luna"); mcwin = new JMenuItem("MCwin"); noire = new JMenuItem("Noire"); smart = new JMenuItem("Smart"); hifi.addActionListener(this); acryl.addActionListener(this); aero.addActionListener(this); aluminium.addActionListener(this); bernstein.addActionListener(this); fast.addActionListener(this); graphite.addActionListener(this); luna.addActionListener(this); mcwin.addActionListener(this); noire.addActionListener(this); smart.addActionListener(this); messengerMenuItem.setText("Messenger"); openMenu.add(messengerMenuItem); openMenu.add(boardMenuItem); audioMenuItem.setText("Audio Messenger"); openMenu.add(audioMenuItem); exitMenuItem.setText("Exit"); exitMenuItem.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { exitMenuItemActionPerformed(evt); } }); openMenu.add(exitMenuItem); boardMenuBar.add(openMenu); saveMessengerMenuItem.setText("Messenger"); saveMenu.add(saveMessengerMenuItem); saveWhiteboardMenuItem.setText("Whiteboard"); saveMenu.add(saveWhiteboardMenuItem); boardMenuBar.add(saveMenu); userMenu.setText("Users"); clientsMenuItem.setText("Current Session"); userMenu.add(clientsMenuItem); themesMenu.add(acryl); themesMenu.add(hifi); themesMenu.add(aero); themesMenu.add(aluminium); themesMenu.add(bernstein); themesMenu.add(fast); themesMenu.add(graphite); themesMenu.add(luna); themesMenu.add(mcwin); themesMenu.add(noire); themesMenu.add(smart); boardMenuBar.add(userMenu); boardMenuBar.add(themesMenu); saveMessengerMenuItem.setEnabled(false); saveWhiteboardMenuItem.setEnabled(false); setJMenuBar(boardMenuBar); setSize(1024, 740); setVisible(true); } protected void exitMenuItemActionPerformed(ActionEvent evt) { System.exit(0); } @Override public void componentHidden(ComponentEvent arg0) { } @Override public void componentMoved(ComponentEvent e) { } @Override public void componentResized(ComponentEvent arg0) { } @Override public void componentShown(ComponentEvent arg0) { } @Override public void actionPerformed(ActionEvent e) { try { if(e.getSource()==hifi) { UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel"); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.hifi.HiFiLookAndFeel"); enableTheme(); hifi.setEnabled(false); } else if(e.getSource()==acryl) { UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel"); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.acryl.AcrylLookAndFeel"); enableTheme(); acryl.setEnabled(false); } else if(e.getSource()==aero) { UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel"); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.aero.AeroLookAndFeel"); enableTheme(); aero.setEnabled(false); } else if(e.getSource()==aluminium) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.aluminium.AluminiumLookAndFeel"); enableTheme(); aluminium.setEnabled(false); } else if(e.getSource()==bernstein) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.bernstein.BernsteinLookAndFeel"); enableTheme(); bernstein.setEnabled(false); } else if(e.getSource()==fast) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.fast.FastLookAndFeel"); enableTheme(); fast.setEnabled(false); } else if(e.getSource()==graphite) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.graphite.GraphiteLookAndFeel"); enableTheme(); graphite.setEnabled(false); } else if(e.getSource()==luna) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.luna.LunaLookAndFeel"); enableTheme(); luna.setEnabled(false); } else if(e.getSource()==mcwin) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.mcwin.McWinLookAndFeel"); enableTheme(); mcwin.setEnabled(false); } else if(e.getSource()==noire) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.noire.NoireLookAndFeel"); enableTheme(); noire.setEnabled(false); } else if(e.getSource()==smart) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.smart.SmartLookAndFeel"); enableTheme(); smart.setEnabled(false); } SwingUtilities.updateComponentTreeUI(getRootPane()); } catch (Exception ex) { ex.printStackTrace(); } } private void enableTheme() { acryl.setEnabled(true); hifi.setEnabled(true); aero.setEnabled(true); aluminium.setEnabled(true); bernstein.setEnabled(true); fast.setEnabled(true); graphite.setEnabled(true); luna.setEnabled(true); mcwin.setEnabled(true); noire.setEnabled(true); smart.setEnabled(true); } public static void main(String []ar) { try { UIManager.setLookAndFeel("com.jtattoo.plaf.acryl.AcrylLookAndFeel"); } catch (Exception e) { e.printStackTrace(); } new DiscussionBoard(); } } What’s the problem here? why its not getting updated? There is a demo application here which is exactly doing what i want but i cant get a clear idea of it.

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