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Struts & Hibernate
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| | | Connecting applet with ejb ? | Connecting applet with ejb ? 2004-12-21 - By Partha Ranjan Das
Back
Hi,
If you need to connect to an EJB from an applet you need to manually create the
InitialContext instance usign a code like below:
Properties p = new Properties();
p.put(Context.PROVIDER_URL, "<your_url>");
p.put(Context.INITIAL_CONTEXT_FACTORY, "<your _factory_details>");
context = new InitialContext(p);
(See the details of your EJB tier spec for these strings.)
And then use this context to call the lookup() method for getting the ejb home.
But in this way you need to communicate to the EJB using RMI in which case you
may have problem with your firewall or similar set-ups. Even the HTTP
tunnelling makes certain areas vulnerable to security risks. So I propose you
put either a servlet between your applet and ejb or expose the ejb methods
through webservices.
Regards,
Partha
-- --Original Message-- --
From: A mailing list for Java(tm) 2 Platform, Enterprise Edition [mailto:J2EE
-INTEREST@(protected)]On Behalf Of Dudi Gil
Sent: Tuesday, December 21, 2004 10:09 AM
To: J2EE-INTEREST@(protected)
Subject: Connecting applet with ejb ?
Hellow,
Can anyone show me an example of how to connect applet with ejb ?
All the JNDI procedure in particular ?
If someone can show me an example of how to to it, I'll be very grateful.
THankd
David
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<BODY bgColor=#ffffff>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=683285704-21122004>Hi,</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=683285704-21122004></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=683285704-21122004>If
you
need to connect to an EJB from an applet you need to manually create the
InitialContext instance usign a code like below:</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff><SPAN class=683285704-21122004><FONT face=Arial><FONT
color=#000000><FONT size=2>
<P>Properties</FONT> <FONT color=#000000>p</FONT> <FONT
color=#000000>=</FONT> <FONT color=#000000><SPAN
class=683285704-21122004>new </SPAN>Properties();</FONT></FONT></P></FONT>
<P><FONT face=Arial><FONT size=2><FONT color=#000000><SPAN
class=683285704-21122004>p</SPAN>.put(Context.PROVIDER_URL,</FONT> <FONT
color=#000000><SPAN
class=683285704-21122004>"<your_url>"</SPAN>);</FONT></FONT></P></FONT>
<P><FONT size=2><FONT face=Arial><FONT
color=#000000>p.put(Context.INITIAL_CONTEXT_FACTORY,</FONT> <FONT
color=#000000><FONT color=#000000><SPAN class=683285704-21122004>"<your
_factory_details>"</SPAN></FONT>);</P></FONT></FONT></FONT>
<P><FONT size=2><FONT face=Arial><FONT color=#000000>context</FONT> <FONT
color=#000000>=</FONT> <FONT color=#000000><SPAN
class=683285704-21122004>new</SPAN></FONT> <FONT
color=#000000>InitialContext(p);</FONT></FONT></FONT></P>
<P><FONT color=#000000 face=Arial size=2><SPAN class=683285704-21122004>(See
the
details of your EJB tier spec for these strings.)</SPAN></FONT></P>
<P><FONT color=#000000 face=Arial size=2><SPAN class=683285704-21122004>And
then
use this context to call the lookup() method for getting the ejb
home.</SPAN></FONT></P>
<P><FONT color=#000000 face=Arial size=2><SPAN class=683285704-21122004>But in
this way you need to communicate to the EJB using RMI in which case you may
have
problem with your firewall or similar set-ups. Even the HTTP tunnelling
makes certain areas vulnerable to security risks. So I propose you put
either a servlet between your applet and ejb or expose the ejb methods through
webservices.</SPAN></FONT></P>
<P><FONT color=#000000 face=Arial size=2><SPAN
class=683285704-21122004>Regards,</SPAN></FONT></P>
<P><FONT color=#000000 face=Arial size=2><SPAN
class=683285704-21122004>Partha</SPAN></FONT></P></SPAN></FONT></DIV>
<BLOCKQUOTE style="MARGIN-RIGHT: 0px">
<DIV align=left class=OutlookMessageHeader dir=ltr><FONT face=Tahoma
size=2>-- --Original Message-- --<BR><B>From:</B> A mailing list for Java(tm)
2 Platform, Enterprise Edition [mailto:J2EE-INTEREST@(protected)]<B>On
Behalf
Of </B>Dudi Gil<BR><B>Sent:</B> Tuesday, December 21, 2004 10:09
AM<BR><B>To:</B> J2EE-INTEREST@(protected)<BR><B>Subject:</B> Connecting
applet with ejb ?<BR><BR></DIV></FONT>
<DIV><FONT face=Arial size=2>Hellow,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Can anyone show me an example of how to connect
applet with ejb ?</FONT></DIV>
<DIV><FONT face=Arial size=2>All the JNDI procedure in particular
?</FONT></DIV>
<DIV><FONT face=Arial size=2>If someone can show me an example of how to to
it, I'll be very grateful.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>THankd</FONT></DIV>
<DIV><FONT face=Arial
size=2>David</FONT> </DIV>==============================================
=============================
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of
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<p>
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