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  1. JDK
  2. JDK-5075570

browser freeze on seq. of liveconnect calls: applet>script>applet>script>applet

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P3
    • Resolution: Duplicate
    • Affects Version/s: 1.4.2, 5.0
    • Fix Version/s: None
    • Component/s: deploy
    • Labels:
    • Subcomponent:
    • CPU:
      x86
    • OS:
      windows_2000, windows_xp

      Description



      Name: gm110360 Date: 07/19/2004


      FULL PRODUCT VERSION :
      Java(TM) Plug-in: Version 1.4.2_04
      Using JRE version 1.5.0-beta Java HotSpot(TM) Client VM
      User home directory = C:\Documents and Settings\amilkowski
      Proxy Configuration: No proxy


      ADDITIONAL OS VERSION INFORMATION :
      Microsoft Windows XP [Version 5.1.2600]

      A DESCRIPTION OF THE PROBLEM :
      test case contains two (2) applets, first applet does liveconnect call
      to a script that writes an IFRAME in a span (_openSpan)
      that IFRAME contains html containing second applet that does
      another live connect call to a script (_test()) that in turn calls applet method (appletMethod()) that then makes a third live connect call to a script (_test2() )

      third live connect call (to a script function: _test2()) never completes and instead browser freezes (requiring alt-ctrl-del)

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      1. load test.html page

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      all liveconnect calls should complete with stable behaviour and
      not freeze browser
      ACTUAL -
      Applet2 attempt to make liveconnect call to _test2() fails,
      browser freezes

      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      1. source code for Applet1:

      import java.applet.*;
      import netscape.javascript.*;

      public class Applet1 extends Applet {

      private JSObject window = null;

      public void init() {
      StaticClass.register(StaticClass.C_APPLET1, this);
      window = StaticClass.getJSObjectWindow(this);
      }
      public void start() {

      System.out.println("Applet1 start(), open span via liveconnect");
      try {
      Object args[] = {};
      window.eval("var u_spn = window.document.createElement('span');");
      window.eval("document.body.insertAdjacentElement('afterBegin', u_spn);");
      window.eval("_openSpan('#000000', 'test2.html','window','height='+(screen.availHeight-36)+',width='+(screen.availWidth-10)+',menubar=0,resizable=0,titlebar=0,toolbar=0,status=0,scrollbars=0,left=0,top=0');");
      } catch(Exception e) {
      System.out.println("Exception: " + e.getMessage());
      }
      }
      public void run() {
      }
      public void stop() {
      }
      public void destroy() {
      }
      }

      2. source code for Applet2:

      import java.applet.*;
      import netscape.javascript.*;

      public class Applet2 extends Applet {

      private static final int C_JSOBJECT_WINDOW_MAX_RETRY = 5;
      private static final int C_JSOBJECT_WINDOW_MAX_SLEEP = 10;

      private JSObject window = null;

      public void init() {
      StaticClass.register(StaticClass.C_APPLET2, this);
      window = StaticClass.getJSObjectWindow(this);
      }
      public void start() {
      System.out.println("Applet2 start() call");
      try {
      Object args[] = {""};
      window.call("_test", args);
      } catch(Exception e) {
      System.out.println("Exception: " + e.getMessage());
      }
      }
      public void stop() {
      }
      public void destroy() {
      }
      public void appletMethod() {
      System.out.println("Applet2 appletMethod() call");

      StaticClass.showStatus("Applet2 appletMethod called");

      try {
      Object args[] = {""};
      window.call("_test2", args);
      } catch(Exception e) {
      System.out.println("Exception: " + e.getMessage());
      }
      }
      }

      3. source code for helper class StaticClass:

      import java.applet.*;
      import netscape.javascript.*;
      import java.util.Hashtable;

      public class StaticClass {

      public static final String C_APPLET1 = "Applet1";
      public static final String C_APPLET2 = "Applet2";

      private static Hashtable registry = new Hashtable();
      private static final int C_JSOBJECT_WINDOW_MAX_RETRY = 5;
      private static final int C_JSOBJECT_WINDOW_MAX_SLEEP = 10;

      static public JSObject getJSObjectWindow(Applet applet) {
      JSObject window = null;
      for (int i = 0; i < C_JSOBJECT_WINDOW_MAX_RETRY; i++) {
      try {
      window = (JSObject) JSObject.getWindow(applet);
      } catch (Exception e) {}
      if (window != null)
      break;
      sleep(C_JSOBJECT_WINDOW_MAX_SLEEP);
      }
      return window;
      }

      static public void sleep(long msecs) {
      long now = System.currentTimeMillis();
      long end = now + msecs;
      while (now < end) {
      try {
      Thread.sleep(end-now);
      }
      catch (InterruptedException ie) {
      }
      now = System.currentTimeMillis();
      }
      }
      static public void register(String key, Object entry) {
      registry.put( key, entry );
      }

      static public Object lookup(String key) {
      Object result = null;
      result = registry.get( key );
      return result;
      }

      static public void showStatus(String status) {
      try {
      Applet applet = (Applet) lookup(C_APPLET1);
      if (applet == null)
      applet = (Applet) lookup(C_APPLET2);
      if (applet != null)
      applet.showStatus(status);
      } catch(Exception e) {
      }
      }
      }

      4. test.html source code:

      <HTML>
      <BODY>

      <script>

      function _openSpan(bgColor, url, name, style) {


       if (document.body && document.body.readyState!="complete") {
      setTimeout("_openSpan("+bgColor+", "+url+", "+name+", "+style+");", 10);
      return;
       }

       var u_data = 'name="u_winAd" src="'+url+'" height=1 width=1';

       _dwSpn('<iframe '+u_data+' scrolling=no frameborder=0 marginheight=1 marginwidth=1></iframe>');

       function _dwSpn(html){u_spn.innerHTML=html;}
      }

      </script>


      <applet code=Applet1 codebase=http://localhost.unicast.com/Project1 name=Applet1 width=0 height=0 align=baseline mayscript></applet>


      </BODY>
      </HTML>

      5. source code for test2.html:

      <HTML>
      <BODY>
      <script>
      function _test() {
        alert('_test() called');
        appletMethod();
      }

      function _test2() {
        alert('_test2() called');
      }

      var u_t1;
      function appletMethod() {
        if(appletReady()) document.applets["Applet2"].appletMethod(); else u_t1=setTimeout(appletMethod, 50);
      }
      function appletReady(){
       var js='return(typeof document.applets["Applet2"] !="undefined" && document.applets["Applet2"].readyState>3 && document.applets["Applet2"].isActive());';
       return _try(js,false);
      }
      function _try(js,rc){return _eJS("try {"+js+"}catch(e){return "+rc+";}");}
      function _eJS(js){var func=new Function(js);return func();}
      function _dw(string) {document.write(string);}
      </script>

      <applet code=Applet2 codebase=http://localhost.unicast.com/Project1 name=Applet2 width=0 height=0 align=baseline mayscript></applet>

      </BODY>
      </HTML>



      ---------- END SOURCE ----------
      (Incident Review ID: 286337)
      ======================================================================

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              Assignee:
              djayaramsunw Devananda Jayaraman (Inactive)
              Reporter:
              gmanwanisunw Girish Manwani (Inactive)
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