Strange behavior for the class initialization

Hey all,.
Take a look at the following examples:

example 1

public class A {}
protected public static String A_FIELD = "a";

{} public static getField()
Return A_FIELD;
}
}

Then we have:

public class B extends a {}
{public static
A_FIELD = 'b ';.
}
}


Why B.getField () returns "a"? Is the compiler tries to optimize the code and replaces B.getField () A.getField ()? Class B was not supposed to be loaded by the JAVA virtual machine and ran the static block?


2nd example:

public class A {}
public static final String A_FIELD = Factory.createInstance () .getField ();

protected String getField() {}
return "a";
}
}


public class B extends a {}

protected String getField() {}
return to 'b ';.
}
}

public class {Factory

public a {createInstance()
(A) return B.class.newInstance ();
}

}

Sometimes, not always, using weblogic server A.A_FIELD is 'a' instead of 'b '. What is the logic?



I hope that you can help them understand what is happening inside the JAVA virtual machine :)
Thank you

FLOB wrote:
Choose the second example :).

No don't.

Winston

Tags: Java

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  at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:354)
  at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:232)
  at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
  at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:78)
  at oracle.adf.library.webapp.LibraryFilter.doFilter(LibraryFilter.java:166)
  at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:78)
  at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:141)
  at java.security.AccessController.doPrivileged(Native Method)
  at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:315)
  at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:649)
  at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:124)
  at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:232)
  at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:94)
  at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:78)
  at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:224)
  at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:78)
  at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:32)
  at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:78)
  at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3654)
  at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3620)
  at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:326)
  at weblogic.security.service.SecurityManager.runAsForUserCode(SecurityManager.java:196)
  at weblogic.servlet.provider.WlsSecurityProvider.runAsForUserCode(WlsSecurityProvider.java:203)
  at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:71)
  at weblogic.servlet.internal.WebAppServletContext.doSecuredExecute(WebAppServletContext.java:2423)
  at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2280)
  at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2258)
  at weblogic.servlet.internal.ServletRequestImpl.runInternal(ServletRequestImpl.java:1626)
  at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1586)
  at weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:270)
  at weblogic.invocation.ComponentInvocationContextManager._runAs(ComponentInvocationContextManager.java:348)
  at weblogic.invocation.ComponentInvocationContextManager.runAs(ComponentInvocationContextManager.java:333)
  at weblogic.work.LivePartitionUtility.doRunWorkUnderContext(LivePartitionUtility.java:54)
  at weblogic.work.PartitionUtility.runWorkUnderContext(PartitionUtility.java:41)
  at weblogic.work.SelfTuningWorkManagerImpl.runWorkUnderContext(SelfTuningWorkManagerImpl.java:617)
  at weblogic.work.ExecuteThread.execute(ExecuteThread.java:397)
  at weblogic.work.ExecuteThread.run(ExecuteThread.java:346)


1 error
}

    In 2014, I created this thread with a similar problem: Jdev 12.1.3: Houston-25152: calling the constructor for the class oracle.jbo.server.SequenceImpl is not allowed (WITH HR TEST... )

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    The strange here is that the application works very well before the migration.

    Kind regards

    Jose.

    I found the problem. I'm oracle.jbo.server.SequenceImpl in the original Version mistakenly.

    Thank you for all your help.

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    Hello

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    Wouter

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    Philippe

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    I am currently working with a two-page ID CS5.5 document. This is a CMYK document with CMYK images and grayscale.

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    Hi all

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    HoaND

    I am interested in this topic as well and looking for the answer elsewhere. Let me know if you have the answer

  • Metrics "database time spent waiting (%) "is 23,02268 for the class of events 'C '.

    Hello
    in 10g,.
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    I do any action/correction?

    Thank you.

    If your user name is happy, then you need not to do anything. If you want to analyze the details, thanks for posting your database AWR report.

    Concerning
    Asif Kabir

  • "Database of the time spent waiting (%) "is 100 for the class of events 'competition '.

    Hello

    When start Enterprise Manager in Oracle 10 g, I have the following warning:

    'Database time spent waiting (%) "represent 100 for the class of events 'competition '.

    I'm new to the topic of listening, what I do with the warning?

    Greetings,

    >
    When start Enterprise Manager in Oracle 10 g, I have the following warning:

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    I'm new to the topic of listening, what I do with the warning?
    >

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    Kind regards
    Uwe

    http://uhesse.WordPress.com

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    I have the following problem: in my Swing application, I want to display a web page. To do this, I use a JFXPanel that contains a WebView. The web page must be loaded in the background, and only if the loading process is totally finished I want to make the JFXPanel visible. I use thegetLoadWorker().workDoneProperty() method of the corresponding WebEngine to determine if the page is totally loaded.

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    Here is the code of the demo application:

    import java.awt.BorderLayout;
import java.awt.Dimension;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Platform;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.embed.swing.JFXPanel;
import javafx.scene.Scene;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
public class WebViewTest extends javax.swing.JPanel {

   private static JFXPanel browserFxPanel;
   private WebView webView;
   private WebEngine eng;

   /**
  * Creates new form WebViewTest
  */
   public WebViewTest() {
  initComponents();
   Platform.setImplicitExit(false);
  browserFxPanel = new JFXPanel();
   Platform.runLater(new Runnable() {
   public void run() {
  webView = createBrowser();
   Scene scene = new Scene(webView);
  scene.setFill(null);
  browserFxPanel.setScene(
  scene);
   }
   });
   }

   /**
  * This method is called from within the constructor to initialize the form. WARNING: Do NOT modify this code. The
  * content of this method is always regenerated by the Form Editor.
  */
   @SuppressWarnings("unchecked")
   // <editor-fold defaultstate="collapsed" desc="Generated Code">  
   private void initComponents() {
  java.awt.GridBagConstraints gridBagConstraints;

  pnlMain = new javax.swing.JPanel();
  showWebpageButton = new javax.swing.JButton();

  setLayout(new java.awt.GridBagLayout());

  pnlMain.setLayout(new java.awt.BorderLayout());
  gridBagConstraints = new java.awt.GridBagConstraints();
  gridBagConstraints.gridx = 0;
  gridBagConstraints.gridy = 1;
  gridBagConstraints.gridwidth = 3;
  gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH;
  gridBagConstraints.weightx = 1.0;
  gridBagConstraints.weighty = 1.0;
  add(pnlMain, gridBagConstraints);

  showWebpageButton.setText("show web page");
  showWebpageButton.setEnabled(false);
  showWebpageButton.addActionListener(new java.awt.event.ActionListener() {
   public void actionPerformed(java.awt.event.ActionEvent evt) {
  showWebpageButtonActionPerformed(evt);
   }
   });
  gridBagConstraints = new java.awt.GridBagConstraints();
  gridBagConstraints.gridx = 1;
  gridBagConstraints.gridy = 0;
  gridBagConstraints.insets = new java.awt.Insets(10, 10, 10, 10);
  add(showWebpageButton, gridBagConstraints);
   }// </editor-fold>  

   private void showWebpageButtonActionPerformed(java.awt.event.ActionEvent evt) {   
  pnlMain.removeAll();
  pnlMain.add(browserFxPanel, BorderLayout.CENTER);
   WebViewTest.this.invalidate();
   WebViewTest.this.revalidate();
   }   
   // Variables declaration - do not modify  
   private javax.swing.JPanel pnlMain;
   private javax.swing.JButton showWebpageButton;
   // End of variables declaration  

   private WebView createBrowser() {
   Double widthDouble = pnlMain.getSize().getWidth();
   Double heightDouble = pnlMain.getSize().getHeight();
   final WebView view = new WebView();
  view.setMinSize(widthDouble, heightDouble);
  view.setPrefSize(widthDouble, heightDouble);
  eng = view.getEngine();
  eng.load("http://todomvc.com/architecture-examples/angularjs/#/");
  eng.getLoadWorker().workDoneProperty().addListener(new ChangeListener<Number>() {
   public void changed(ObservableValue<? extends Number> ov, Number t, Number t1) {
   final double workDone = eng.getLoadWorker().getWorkDone();
   final double totalWork = eng.getLoadWorker().getTotalWork();
   if (workDone == totalWork) {
  showWebpageButton.setEnabled(true);
   }
   }
   });
   return view;
   }

   public static void main(String[] args) {
   SwingUtilities.invokeLater(new Runnable() {
   public void run() {
   final JFrame f = new JFrame("Navigator Dummy");
  f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
  f.setSize(new Dimension(1024, 800));
   final WebViewTest navDummy = new WebViewTest();
  f.getContentPane().add(navDummy);
  f.setVisible(true);
   }
   });
   }
}

    I don "t understand this behavior, in fact the page has already been loaded. To me, it seems that the WebView starts to render the site just to the point where it becomes visible. What can I do to get the WebView already shows the web page is loaded right now that it becomes Visible (to avoid this effect of flickr)?

    I already posted this question on StackOverflow (see http://stackoverflow.com/questions/18873315/javafx-webview-loading-page-in-background ) but didn't get an answer and found this forum today.

    Thanks in advance!

    Try the updated version in this post.

    It requires a snapshot offscreen before displaying the Web mode to make sure all is rendered before the Web is displayed.

    The code is kind of ugly and the 'solution' is a bit of a hack, you would probably want to clean it up a bit before using it anywhere (for example, there is no need to create a new WebView and snapshot, web page on each load - I did it just to get a feel for the worst-case scenario and try to pinpoint where are produce slowdowns).

    A small rectangle moves back on the top of the screen so that the fluidity of the animation can be monitored.

    On the first charge, there will be a slight stutter in the animation, but the rendered web page instantly appears when click the show page"" button.

    As you say, the stuttering occurs only the first time the page is loaded, then everything is smooth.  If you use a progress bar regular instead of an animation, the initial stuttering is probably fine, because people expect to see breaks in the progress bars from time to time (more progress reported by progress bars is not a smooth linear progression).  My guess is that if you use a regular progress bar, the behavior seen with this example is probably acceptable for almost all users.

    As for the differences between the rendering between 2.2 JavaFX and JavaFX 8, there was a lot of changes to the internal architecture of JavaFX for JavaFX 8 that have improved rendering performance, as well as probably represents the delta.

    import javafx.animation.*;
import javafx.application.Application;
import javafx.concurrent.Worker;
import javafx.geometry.*;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.scene.web.WebView;
import javafx.stage.Stage;
import javafx.util.Duration;

public class WebViewJavaFXTest extends Application {
    public static final String PAGE_URL = "http://todomvc.com/architecture-examples/angularjs/#/";
    private Rectangle distractor;

    @Override
    public void start(Stage stage) throws Exception {
        distractor = new Rectangle(20, 20, Color.CORAL);
        TranslateTransition r = new TranslateTransition(Duration.seconds(10), distractor);
        r.setFromX(0);
        r.setToX(800);
        r.setInterpolator(Interpolator.LINEAR);
        r.setCycleCount(RotateTransition.INDEFINITE);
        r.setAutoReverse(true);
        r.play();

        VBox layout = initView();
        stage.setScene(new Scene(layout));
        stage.show();
    }

    private VBox initView() {
        final ProgressBar progress = new ProgressBar();
        final Button showWebView = new Button("Show Page");
        showWebView.setDisable(true);
        HBox controls = new HBox(
                10,
                progress,
                showWebView
        );
        controls.setAlignment(Pos.CENTER_LEFT);
        Button tryAgain = new Button("Try Again");
        tryAgain.setOnAction(actionEvent ->
                tryAgain.getScene().setRoot(
                        initView()
                )
        );

        StackPane webViewHolder = new StackPane();
        webViewHolder.setPrefSize(1024, 700);

        final WebView webView = new WebView();
        progress.progressProperty().bind(
                webView.getEngine().getLoadWorker().progressProperty()
        );
        webView.setPrefSize(1024, 700);
        webView.getEngine().load(PAGE_URL);
        webView.getEngine().getLoadWorker().stateProperty().addListener(
                (o, old, state) -> {
                    if (state == Worker.State.SUCCEEDED) {
                        webView.snapshot(
                                snapshotResult -> {
                                    showWebView.setDisable(false);
                                    return null;
                                },
                                null,
                                null
                        );
                    } else {
                        showWebView.setDisable(true);
                    }
                }
        );

        showWebView.setOnAction(actionEvent -> {
            controls.getChildren().setAll(
                    tryAgain
            );
            webViewHolder.getChildren().setAll(webView);
        });
        VBox layout = new VBox(
                10,
                distractor,
                controls,
                webViewHolder
        );
        layout.setPadding(new Insets(10));

        return layout;
    }

    public static void main(String[] args) {
        launch();
    }

}

  • Strange behavior with the function «Help in command line»

    So I do a little playing with the opening of the files compiled help (.chm) with the command-line help feature, and I saw a strange behavior when trying to index multi-level access keywords. According to the documentation, if you set the 'Key' operation, you can enter a value for ' string to search for "to access this section. The more precise help that:

    If this string contains a keyword index, the string must match the key of the index as it appears in the help index file. To access a topic with a multilevel index keyword, enter the keyword of the top-level index, a colon and the keyword of the second level index. Do not separate the elements with spaces. For example, a chain of error codes: GPIB jumps about a subject with a keyword of top-level index of error codes and a second level keyword index of GPIB.

    All right, seems simple enough. Except that when I tried, I couldn't work, even with the example provided. I tried the following simple test:

    Opens the help file, but it opens to this page, not to the page ' error codes: GPIB "non-descript. I saw this in 8.2 and 8.6. Anyone have any success with access to a multi-level keyword?

    Note - side

    Curiously, the Index for the help lvconcepts.chm file looks like this:

    In other words, the input index text is just "GPIB", but the text that appears in the keyword field is "codes error, GPIB. I'm curious to know how this was accomplished. I decompiled the lvconcepts.chm file and watched the .hhk file, and it is not immediately obvious to me. (By the way, if you try to use "error codes, GPIB" it does not either).

    Hello

    Please contact National Instruments!
    It is a very strange behavior.  I tested out and seen the exact
    same results you are experiencing.  This was reported to R & D (AUTO ID # 130246) for further investigations.
    From what I can tell the a possible workaround solution that we have documented
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    run in this way.  Thanks much for the feedback!  If
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    Dear Guru,

    We have an application developed using Jdeveloper - 11.1.2.3 and deployed to production WLS - 10.3.5, when running applications through internet Explorer became 'with the exception of compatibility"then we added under settings in the application (as suggested in many blogs) Web.XML and deployed the same,

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    oracle.adf.view.rich.HIDE_UNSUPPORTED_BROWSER_ALERTS < param-name > < / param-name >

    IECompatibilityModes < param-value > < / param-value >

    < / context-param >

    Now not to launch except for compatibility but demand was showing strange behavior as

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    (2) little components or records show not yet what is normal in chrome and mozilla.

    Please help me out.

    Best regards,

    Hello

    Please specify the version of Internet Explorer. Remove the entry mask not supported.

    To set this feature, use the following:

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    org.apache.myfaces.trinidad.Agent #OVERRIDE_IE_COMPATIBILITY_MODE
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    I also tried this and his work in my environment of webcenter for IE 8 and 9.

    Reference:something about the Fusion Middleware: work around IE (IE8/9) Compatibility Mode in ADF/WebCenter App

    Thank you
    Amey

  • [MAF - AMPA] Strange behavior of the MAF with REST service

    Hi MAF Experts.

    I just noticed that there is a strange behavior in my application of the MAF. The first loading of the page, amx:page does not make its contents (of REST). However if I kill the app and relaunch the app, content appears.

    Pattern:

    1. Start of the CRG App
    2. Opening of session
    3. Dashboard (the content is rendered)
    4. Go to any other aspect (lets say a list of products)
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    6. Kill the MAF application
    7. Start of the CRG App
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    I put a few breakpoints on EntityCRUDService and RestPersistenceManager.

    So far it return the list of entities and display the correct data (from watches in debug mode)

    Last thing I noticed is the red color below. She defined the EntityList with the new value of REST (This displays a correct value).

    TaskExecutor.getInstance (.execute (isDoRemoteReadInBackground ())

    , () -> {

    Auto Sync all actions pending first, pass false for inBackground because

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    getDataSynchManager (.synchronize (false));

    The list of entities < E > = executeRemoteFindAll();

    If (entities! = null)

    {

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    setEntityList (entities);

    }

    });

    Any suggestion?

    All the rest service are configured with AutoQuery = true in the persistence - mapping.xml

    See you soon,.

    Hendry

    Hendry,

    Thanks your testcase, I was able to understand the problem.

    It turns out that MAF 2.1 has problems dealing with the advanced way in which AMPA running background tasks with the help of a thread in all of features.

    We have slightly modified the implementation in AMPA to use one thread per function and now the update issue is resolved. I sent you a link to new construction.

    We will publish the new generation soon on GitHub so that others can benefit in the same solution.

    Steven Davelaar,

    Oracle Mobile A-team.

  • Strange behavior of the Animation

    Hello guys.

    I'm fading in the textArea 3 and 3 labels State 'default' to 'addRecommend' and fade out the text box and labels seeOther State to addREcommend. The defautl-> addRecommend works very well. However, addRecommend-> seeOther

    show "a text box" (which is not included in State seeOther) and kill my "add to database button" (which is in a State of seeOther).

    If I delete detailText and details of my transition melted, everything will work, but I need to have my detailText and fade out too much in detail. If I do not explain my question, please copy my code and paste it into your flex. I spent 5 hours to debug it but no luck. I have really really grateful if someone could help me.

    < fx:Script >

    <! [CDATA]

    protected function add_clickHandler(event:MouseEvent):void

    {

    currentState = "addRecommend";

    / / addRecommendMove.play ();

    }

    protected function seeOther_clickHandler(event:MouseEvent):void

    {

    currentState = "seeOther."

    }

    ]]>

    < / fx:Script >

    < s: states >

    < name s: State = "default" / >

    < s: State name = "addRecommend" / >

    < s: State name = "seeOther" / >

    < / s: states >

    < s:transitions >

    < s:Transition toState = "addRecommend" >

    < s:Sequence >

    < s:Parallel >

    < s:Move target = "{add}" / >

    < s:Resize target = "{add}" / >

    < s:Move target = "{seeOthers}" / >

    < / s:Parallel >

    < s:Parallel >

    < s:AddAction target = "{[yourname, username, recommendCityLabel, recommendCity, detailText, detail]}" / >

    <!-if delete detailText and detail, the transition fade will be fine... but I need them to fade our and bland in...-->

    < s: bland target = "{[yourname, username, recommendCityLabel, recommendCity, detailText, detail]}" / >

    <!-if delete detailText and detail, the transition fade will be fine... but I need them to fade our and bland in...-->

    < / s:Parallel >

    < / s:Sequence >

    < / s:Transition >

    < s:Transition toState = "seeOther" >

    < s:Sequence >

    < s:Parallel >

    < s: bland target = "{[yourname, username, recommendCityLabel, recommendCity, detailText, detail]}" / >

    <!-if delete detailText and detail, the transition fade will be fine... but I need them to fade our and bland in...-->

    < / s:Parallel >

    < s:Parallel >

    < s:Move target = "{add}" / >

    < s:Move target = "{seeOthers}" / >

    < / s:Parallel >

    < / s:Sequence >

    < / s:Transition >

    < / s:transitions >

    < s:Label color = "#000000".

    x="10"

    y="60"

    ID = "YourName".

    fontSize = "13".

    fontFamily = 'arial '.

    text = "Your name" includeIn = "addRecommend" / >

    < s:TextInput x = "10" y = "75" width = "50%" paddingLeft = "10" id = "userName" includeIn = "addRecommend" / >

    < s:Label color = "#000000".

    y="110"

    x="10"

    fontSize = "13".

    fontFamily = 'arial '.

    ID = "recommendCityLabel".

    text = "Recommended City" includeIn = "addRecommend" / >

    < s:TextInput x = "10" y = "125" id = "recommendCity" width = "85%" includeIn = "addRecommend" / >

    < s:Label color = "#000000" x = "10" y = "155".

    fontSize = "13".

    ID = "detailText" <!-if I add this label to my transition melted, the strange behavior->

    text = "you can add details!

    fontFamily = 'arial '.

    includeIn = "addRecommend" / >

    < s:TextArea = "180".

    x = "10".

    paddingLeft = "10".

    ID = "detail" <! - if I add this textArea for my transition melted, the strange behavior too - >

    Width = "90%" height = "160" includeIn = "addRecommend" / >

    < s:Button id = 'Add '.

    x="10"

    y="60"

    y.addRecommend = "350"

    width = "210".

    width.addRecommend = "150"

    height = "35".

    fontWeight = "bold".

    fontSize = "12".

    fontFamily = 'arial '.

    toolTip = "recommend your favorite places.

    label = "add your recommendation."

    label.addRecommend = "Add to database"

    Click = "add_clickHandler (Event)" "

    />

    < s:Button id = "seeOthers".

    y="105"

    x="10"

    y.addRecommend = "400"

    width = "220".

    height = "35".

    fontWeight = "bold".

    fontSize = "12".

    fontFamily = 'arial '.

    toolTip = "see recommendation of others.

    label = "see other recommendations.

    Click = "seeOther_clickHandler (event)" / >

    Hello

    I had a look at these, I think that the provision itself was a bit wonky, I enclose the code in a link like this forum tends to eat code that doesn't help when you're trying to look at the code.

    You have the basics of work, but to avoid confusion in the States and the code, I suggest you try to group your objects to display relevant to the effects of transition, it is easier to control and maintain.
    On a side note use you designview in the ide to see how States will look, this tool will be of great help while you learn, ignore anyone who tells you not to use designview, it is a page layout tool and works well for these types of tasks.
    David.

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