Java plug-in 1.4.1 proxy configuration issue causes JTextField TAB problems

I have an applet that has multiple JTextFields in it. I recently updated my Java plug-in to version 1.4.1, and now using TAB to navigate among text fields does not always work when I first bring up a browser and load the applet.
I've found, however, that if I open the Java Console and hit "p" (reload proxy configuration), and then reload my applet (hit Refresh/Reload on my browser), the Tab key works as expected. I did not have this issue with releases prior to 1.4.1.
Any clue on how I can ensure proper proxy configuration upon initial instantiation of the browser? I've seen the problem in both IE 6.0 and Netscape 7.0.
Note that the reloading of the proxy configuration only appears to be necessary once per browser session.

The navigation isn't working. I click in the first text field to give the initial field focus. I then hit TAB and nothing happens. I have a key listener set up for the ENTER key, and this is also supposed to navigate to the next field via:
((JTextField)evt.getSource()).transferFocus();
To see if there was a problem with my build environment or threads in my application, I came up with the following dummy applet:
import java.awt.BorderLayout;
import javax.swing.BoxLayout;
import javax.swing.JApplet;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class TestApplet extends JApplet {
public void init() {
super.init();
public void start() {
JPanel myPanel = new JPanel();
myPanel.setLayout(new BoxLayout(myPanel, BoxLayout.Y_AXIS));
JTextField textField1 = new JTextField("Text Field 1");
myPanel.add(textField1);
JTextField textField2 = new JTextField("Text Field 2");
myPanel.add(textField2);
JTextField textField3 = new JTextField("Text Field 3");
myPanel.add(textField3);
getContentPane().add(BorderLayout.CENTER, myPanel);
public void stop() {
super.stop();
I then compiled this applet using the following:
javac TestApplet.java
I then put together the following HTML file:
<HTML>
<HEAD>
<TITLE>Test Applet</TITLE>
</HEAD>
<BODY MARGINWIDTH="0" MARGINHEIGHT="0" BGCOLOR="white">
<APPLET
CODE=TestApplet.class
WIDTH=635
HEIGHT=500
ALIGN=left
VSPACE=10
HSPACE=10
>
</APPLET>
</BODY>
</HTML>
The results are the same. I am not able to navigate using the TAB key until I bring up the Java console and then close it again. I would think that if this was a bug in 1.4.1_01, I would have seen it all over the forums. Any help would be greatly appreciated.

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    JRE 1.5.0_2
    JRE 1.5.0_3
    JRE 1.5.0_4
    JRE 1.5.0_5
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    Cecilia
    ([email protected])

  • Java Plug-in 1.5.0_02 applet error

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    This document may have the information you're looking for:
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  • Applets and memory not being released by Java Plug-in

    Hi.
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          // to the destroy() applet method.
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        catch (Exception e)
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      // Component initialization
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        label = new JLabel("Test Memory Applet");
        getContentPane().add(label, BorderLayout.CENTER);
      // Start the applet
      public void start()
        // Do nothing
      // Stop the applet
      public void stop()
        // Do nothing
      // Destroy the applet
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        // testArray = null;
      //Get Applet information
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        return "Test Memory Applet";
    // ===================================================Everything works fine if I set the byte array to "null" upon destroy(), but does this mean that I have to manually set to null all applet's member variables upon destroy()? I believe this should not be a requirement for non-static members...
    I am able to reproduce this problem on the following PC configurations:
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    * Linux (Sun Java Desktop), JRE v1.6.0, Mozilla browser
    * Mac OS X v10.4, JRE v1.5.0_06, Safari browser
    Your comments would be really appreciated.
    Thank you in advance for your feedback.
    Regards,
    Marco.

    Hi Marco,
    my guess as to why JPI would keep references around, if it does keep them, is that it propably is an implementation side effect. A lot of things are cached in the name of performance and it is easy to leave things laying around in your cache. Maybe the page with the associated images/applets is kept in the browser cache untill the browser needs some memory and if the browser memory manager is not co-operating with the JPI/JVM memory manager the browser is not out of memory, thus not releasing its caches but the JVM may be out of memory. Thus the browser indirectly keeps the reference that it realy does not need. This reference could be inderect through some 'applet context' or what ever the browser uses to interact with JPI, don't realy know any of these details, just imaging what must/could be going on there. Browser are amazingly complicated beast.
    This behaviour that you are observing, weather the origin is something like I speculated or not, is not nice but I would not expect it to be fixed even if you filed a bug report. I guess we are left with relleasing all significatn memory structures in destroy. A simple way to code this is not to store anything in the member fields of the applet but in a separate class; then one has to do is to null that one reference from the applet to that class in the destroy method and everything will be relased when necessary. This way it is not easy to forget to release things.
    Hey, here is a simple, imaginary, way in which the browser could cause this problem:
    The browser, of course needs a reference to the applet, call it m_Applet here. Presume the following helper function:
    Applet instantiateAndInit(Class appletClass) {
    Applet applet=appletClass.newInstance();
    applet.init();
    return applet;
    When the browser sees the applet tag it instantiates and inits the new applet as follows:
    m_Applet=instantiateAndInit(appletClass);
    As you can readily see, the second time the instantiation occurs, the m_Applet holds the reference to the old applet until after the new instance is created and initlized. This would not cause a memory leak but would require that twice the memory needed by the applet would be required to prevent OutOfMemory.I guess it is not fair to call this sort of thing a bug but it is questionable design.In real life this is propably not this blatant, but could happen You could try, if you like, by allocating less than 32 Megs in your init. If you then do not run out of memory it is an indication that there are at most two instances of your applet around and thus it could well be someting like I've speculated here.
    br Kusti

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