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Date:         Sat, 31 Aug 2002 14:19:14 -0700
From:         "L-Soft list server at DevelopMentor (1.8e)"              <LISTSERV@DISCUSS.DEVELOP.COM>
Subject:      File: "JAVA LOG0004"
To:           Steven Haryanto <[deleted]@[deleted]>

=========================================================================
Date:         Mon, 3 Apr 2000 11:15:09 -0700
Reply-To:     Java Discussion <JAVA@DISCUSS.DEVELOP.COM>
Sender:       Java Discussion <JAVA@DISCUSS.DEVELOP.COM>
From:         Munir Hafez <munir.hafez@CHEETAHTECH.COM>
Subject:      Class Loader

Hello,

Scenario:
You are implementing an extension to the default class loaders defined by
Java to be able to load new versions of a Java class file based on the
date/time stamp on the file.

Problem:
You can easily check the date/time stamp of the file locally and decide
whether to re-load the file or not, BUT if you extending a URLClassLoader
and your files are coming from a remote web server, how can you determine
that the file on the web server is newer than the version you have loaded
into memory or on your local drive ???

Thanks.
=========================================================================
Date:         Mon, 3 Apr 2000 23:54:29 -0400
Reply-To:     Java Discussion <JAVA@DISCUSS.DEVELOP.COM>
Sender:       Java Discussion <JAVA@DISCUSS.DEVELOP.COM>
From:         Stu Halloway <stu@DEVELOP.COM>
Subject:      Re: Class Loader
In-Reply-To:  <JAVA%2000040311153674@DISCUSS.DEVELOP.COM>
MIME-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit

Hi Munir,

A simple approach would be to have a pair of version files (one each on
client and server) that list class names and version numbers.  Have your
URLClassLoader use two URLs, one local and one remote.  Then call
getResource("http://remote/versions.xml").  Compare the versions to version
numbers stored in your local copy of versions.xml.  If versions match, then
use the local URL.  If they don't then get the bytes from the remote URL,
save the class locally, load the class locally, and update the local
versions.xml.

I haven't done any JINI work--they may already have an architecture that
solves this problem.  Anybody know?

Stuart Halloway
DevelopMentor
http://staff.develop.com/halloway

> -----Original Message-----
> From: Java Discussion [mailto:JAVA@DISCUSS.DEVELOP.COM]On Behalf Of
> Munir Hafez
> Sent: Monday, April 03, 2000 2:15 PM
> To: JAVA@DISCUSS.DEVELOP.COM
> Subject: [JAVA] Class Loader
>
>
> Hello,
>
> Scenario:
> You are implementing an extension to the default class loaders defined by
> Java to be able to load new versions of a Java class file based on the
> date/time stamp on the file.
>
> Problem:
> You can easily check the date/time stamp of the file locally and decide
> whether to re-load the file or not, BUT if you extending a URLClassLoader
> and your files are coming from a remote web server, how can you determine
> that the file on the web server is newer than the version you have loaded
> into memory or on your local drive ???
>
> Thanks.
=========================================================================
Date:         Thu, 6 Apr 2000 22:00:00 -0000
Reply-To:     Java Discussion <JAVA@DISCUSS.DEVELOP.COM>
Sender:       Java Discussion <JAVA@DISCUSS.DEVELOP.COM>
Comments:     RFC822 error: <W> Incorrect or incomplete address field found and
              ignored.
From:         Sudarson Roy Pratihar <sudarson.pratihar@TATAINFOTECH.COM>
Subject:      Problem in making a calendar
MIME-Version: 1.0
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I needed a calendar in java which has the following features:
1. The calendar should show the entire calendar of the year if only year =
is specified only=20
    in a JTextField corresponding to year
2. The calendar should show the calendar should show the calendar of the =
month                  specified in  corresponding JTextField specified =
if only month is                                         specified       =
                  =20
3.  The calendar should show the calendar should show the calendar of =
the                                 month and year specified=20

4. The calendar should have some property of diary so that use can note =
important             events or appoinments against a date so that when =
user clicks a date a dialog box with     table appears.

 Can anybody have any solution or guide regarding this problem ? Please =
help me.




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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META content=3D"MSHTML 5.00.2314.1000" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV align=3Djustify><FONT face=3DArial size=3D3>I needed a calendar in =
java which has=20
the following features:<BR>1. The calendar should show the entire =
calendar of=20
the year if only year is specified =
only&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;in a=20
JTextField corresponding to year<BR>2. The calendar should show the =
calendar=20
should show the calendar of the month&nbsp; &nbsp;&nbsp;&nbsp;=20
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; specified=20
in&nbsp;&nbsp;corresponding JTextField specified if only month is=20
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;=20
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;=20
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;=20
specified&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;=20
</FONT></DIV>
<DIV align=3Djustify><FONT face=3DArial size=3D3>3.&nbsp; The calendar =
should show the=20
calendar should show the calendar of the &nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;=20
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;=20
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; month&nbsp;and year=20
specified&nbsp;<BR></FONT></DIV>
<DIV align=3Djustify><FONT face=3DArial size=3D3>4. The calendar should =
have some=20
property of diary so that use can note important &nbsp;&nbsp;&nbsp;=20
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; events or appoinments against a =
date so=20
that when user clicks a date a dialog box with &nbsp;&nbsp;&nbsp; table=20
appears.</FONT></DIV>
<DIV align=3Djustify>&nbsp;</DIV>
<DIV align=3Djustify><FONT face=3DArial size=3D3>&nbsp;Can anybody have =
any solution=20
or guide regarding this problem ? Please help me.</FONT></DIV>
<DIV align=3Djustify>&nbsp;</DIV>
<DIV align=3Djustify>&nbsp;</DIV>
<DIV align=3Djustify>&nbsp;</DIV></BODY></HTML>

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=========================================================================
Date:         Thu, 6 Apr 2000 22:00:48 -0000
Reply-To:     Java Discussion <JAVA@DISCUSS.DEVELOP.COM>
Sender:       Java Discussion <JAVA@DISCUSS.DEVELOP.COM>
Comments:     RFC822 error: <W> Incorrect or incomplete address field found and
              ignored.
From:         Sudarson Roy Pratihar <sudarson.pratihar@TATAINFOTECH.COM>
Subject:      Problem in setting an animated GIF image at JFrame's icon at
              titlebar
MIME-Version: 1.0
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While trying to set an animated gif to a JFrame's iconimage using the =
following code in MyFrames's constructor , I find the following problem:
  1.. after myframe.setVisible(true) no screen is displayed.=20
  2.. only java virtual machine runs.
For information:
os: windows 95
processor: pentium 2
builder IDE:Oracle JDeveloper 3.0

Partial code:
/*file MyFrameTest.java
*/
public class MyFrameTest
{
        MyFrameTest()
        {
        JFrame myframe=3Dnew MyFrame();
        /*Intialization code

            *
          *
            *
        */
        /*some code for adding action listener for window clasing*/
        myframe.setVisible(true);
=20
}
        public static void main(String args[])
        {   =20
            MyFrameTest();
        }
}


/*file MyFrame.java
*/
public class MyFrame extends Jframe=20
{
/* some declaration*/
ImageIcon imageicon;
=20
public MyFrame()
{
    jbinit();
    this.setIconImage(imageicon.getImage());
  }
       =20
jbinit()
{
/* some code*/
    imageicon =3D new =
ImageIcon(MyFrame.class.getResource("animatedbutton.gif");
/* some other code*/
}
}

/* animatebutton.gif is an animated gif present in the current =
directory*/


Can anybody help me ? or suggest something



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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META content=3D"MSHTML 5.00.2314.1000" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D3>While trying to set an animated gif to =
a JFrame's=20
iconimage using the following code in MyFrames's constructor , I find =
the=20
following problem:</FONT></DIV>
<OL>
  <LI><FONT face=3DArial size=3D3>after myframe.setVisible(true) no =
screen is=20
  displayed.</FONT>=20
  <LI><FONT face=3DArial>only java virtual machine =
runs.</FONT></LI></OL>
<DIV><FONT face=3DArial>For information:</FONT></DIV>
<DIV><FONT face=3DArial>os: windows 95</FONT></DIV>
<DIV><FONT face=3DArial>processor: pentium 2</FONT></DIV>
<DIV><FONT face=3DArial>builder IDE:Oracle JDeveloper 3.0</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial>Partial code:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>/*file MyFrameTest.java</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>*/</FONT></DIV>
<DIV><FONT face=3DArial>public class MyFrameTest</FONT></DIV>
<DIV><FONT face=3DArial>{</FONT></DIV>
<DIV><FONT face=3DArial =
size=3D3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
MyFrameTest()</FONT></DIV>
<DIV><FONT face=3DArial>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; =
{</FONT></DIV>
<DIV><FONT face=3DArial size=3D3>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; =
JFrame=20
myframe=3Dnew MyFrame();</FONT></DIV>
<DIV><FONT face=3DArial =
size=3D3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
/*Intialization code</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;=20
&nbsp;&nbsp;&nbsp; *</FONT></DIV>
<DIV><FONT face=3DArial=20
size=3D3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
*</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;=20
&nbsp;&nbsp;&nbsp; *</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;=20
*/</FONT></DIV>
<DIV><FONT face=3DArial =
size=3D3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; /*some=20
code for adding action listener for window clasing*/</FONT></DIV>
<DIV><FONT face=3DArial =
size=3D3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
myframe.setVisible(true);</FONT></DIV>
<DIV><FONT face=3DArial size=3D3></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D3>}</FONT></DIV>
<DIV><FONT face=3DArial>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
public static=20
void main(String args[])</FONT></DIV>
<DIV><FONT face=3DArial>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; =
{&nbsp;&nbsp;&nbsp;=20
</FONT></DIV>
<DIV><FONT face=3DArial>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;=20
MyFrameTest();</FONT></DIV>
<DIV><FONT face=3DArial>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; =
}</FONT></DIV>
<DIV><FONT face=3DArial>}</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D3>/*file MyFrame.java</FONT></DIV>
<DIV><FONT face=3DArial>*/</FONT></DIV>
<DIV><FONT face=3DArial>public class MyFrame extends Jframe =
</FONT></DIV>
<DIV><FONT face=3DArial>{</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>/* some declaration*/</FONT></DIV>
<DIV><FONT face=3DArial size=3D3>ImageIcon imageicon;</FONT></DIV>
<DIV><FONT face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial>public MyFrame()</FONT></DIV>
<DIV><FONT face=3DArial>{</FONT></DIV>
<DIV><FONT face=3DArial>&nbsp;&nbsp;&nbsp; jbinit();</FONT></DIV>
<DIV><FONT face=3DArial>&nbsp;&nbsp;&nbsp; =
this.setIconImage(</FONT><FONT=20
face=3DArial>imageicon.getImage());</FONT></DIV>
<DIV><FONT face=3DArial>&nbsp;&nbsp;}</FONT></DIV>
<DIV><FONT face=3DArial>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</FONT></DIV>
<DIV><FONT face=3DArial size=3D3>jbinit()</FONT></DIV>
<DIV><FONT face=3DArial>{</FONT></DIV>
<DIV><FONT face=3DArial>/* some code*/</FONT></DIV>
<DIV><FONT face=3DArial>&nbsp;&nbsp;&nbsp; imageicon =3D new=20
ImageIcon(MyFrame.class.getResource("animatedbutton.gif");</FONT></DIV>
<DIV><FONT face=3DArial>/* some other code*/</FONT></DIV>
<DIV><FONT face=3DArial>}</FONT></DIV>
<DIV><FONT face=3DArial>}</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>/* animatebutton.gif is an animated gif =
present in=20
the current directory*/</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D3><STRONG><U>Can anybody help me ? or =
suggest=20
something</U></STRONG></FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV></BODY></HTML>

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=========================================================================
Date:         Fri, 7 Apr 2000 15:31:48 -0700
Reply-To:     Java Discussion <JAVA@DISCUSS.DEVELOP.COM>
Sender:       Java Discussion <JAVA@DISCUSS.DEVELOP.COM>
From:         Brian Maso <brian@BLUMENFELD-MASO.COM>
Subject:      Re: Class Loader
Mime-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit

Sorry I didn't respond sooner...

Jini does not have any dynamic class loading based on version like this.
Products that do this include Sun's Java Embedded Server, and dyamic app
servers such as Marimba's Castanet.

Brian Maso
DevelopMentor Java Curriculum Developer (http://www.develop.com)
Blumenfeld & Maso, Inc.

-----Original Message-----
From: Stu Halloway <stu@DEVELOP.COM>
To: JAVA@DISCUSS.DEVELOP.COM <JAVA@DISCUSS.DEVELOP.COM>
Date: Monday, April 03, 2000 8:54 PM
Subject: Re: [JAVA] Class Loader


>Hi Munir,
>
>A simple approach would be to have a pair of version files (one each on
>client and server) that list class names and version numbers.  Have your
>URLClassLoader use two URLs, one local and one remote.  Then call
>getResource("http://remote/versions.xml").  Compare the versions to version
>numbers stored in your local copy of versions.xml.  If versions match, then
>use the local URL.  If they don't then get the bytes from the remote URL,
>save the class locally, load the class locally, and update the local
>versions.xml.
>
>I haven't done any JINI work--they may already have an architecture that
>solves this problem.  Anybody know?
>
>Stuart Halloway
>DevelopMentor
>http://staff.develop.com/halloway
>
>> -----Original Message-----
>> From: Java Discussion [mailto:JAVA@DISCUSS.DEVELOP.COM]On Behalf Of
>> Munir Hafez
>> Sent: Monday, April 03, 2000 2:15 PM
>> To: JAVA@DISCUSS.DEVELOP.COM
>> Subject: [JAVA] Class Loader
>>
>>
>> Hello,
>>
>> Scenario:
>> You are implementing an extension to the default class loaders defined by
>> Java to be able to load new versions of a Java class file based on the
>> date/time stamp on the file.
>>
>> Problem:
>> You can easily check the date/time stamp of the file locally and decide
>> whether to re-load the file or not, BUT if you extending a URLClassLoader
>> and your files are coming from a remote web server, how can you determine
>> that the file on the web server is newer than the version you have loaded
>> into memory or on your local drive ???
>>
>> Thanks.
>