Hi ,
>From the document of EJB, I also find that:
1. can not use "ServerSocket"
2. can not use "java.io" to access a file.
...
But :
1. from jps1.0.1, it need to modify the j2sdk1.2.1\lib\security\server.policy,
and
grant the following:
permission java.io.FilePermission "??ALL FILES>>","read, write,delete";
2. And after I grant such "Permission", my session bean can access local files.
So :
1. Can we grant some "Permission" to "ServerSocket"?
2. If we can grant such "Permission" , how to explain the document
of EJB? Does the document means that it is not "robust" if we grant such
"Permission"? Because now I don't have a "Object database" to use, so
sometimes it is not convenient to "divide" my class, so I need to save the
class
into a file.
Thanks for your time!
Bo
July 07,2000
yu_robin wrote:
> Hi,
> but I must communicate with a server application that lies in an
> another machine, the server application is a intrinsic part, and it only has
> the socket interface, I cannot modify it. In my project, a part of my date
> lies in a database, but another part lies in a close environment that must
> be accessed through that server application. So I must access some through
> entity bean and some through sockets. For hiding the difference of the two
> ways of accessing data, I want to write sockets in my entity beans also. And
> I need not take care of transaction, because the socket server application
> can do it automatically.
>
> ++++++++++++++++++++++++++++
> Shanghai Huateng Software Systems Co., Ltd.
> 418 Gui Lin Road
> Shanghai, P.R.China 200233
> Tel : +86-21-6451-3533-11
> Fax : +86-21-6472-8625
> E-mail : [EMAIL PROTECTED]
> Web : http://www.huateng.com
> http://www.chinapay.com
>
> ? ----------
> ? From: Jonas Wallenius[SMTP:[EMAIL PROTECTED]]
> ? Reply To: A mailing list for Enterprise JavaBeans development
> ? Sent: Friday, July 7, 2000 5:40 PM
> ? To: [EMAIL PROTECTED]
> ? Subject: Re: Socket in Entity Bean
> ?
> ? Afaik you _could_, but it wouldn't be transactional (not a problem for
> ? read-only operations I suppose), you expose yourself to more potential
> ? exception sources (=higher risk your bean might mess up transactions it
> ? partakes in unless the network the socket call is made over can be
> ? considered
> ? reliable), and I guess there might be potential problems if the remote end
> ? blocks for a long time or so... It shouldn't be too hard to put together a
> ? very
> ? simple test environment to find out, though?
> ?
> ? /Jonas
> ?
> ? On Fri, 7 Jul 2000, yu_robin wrote:
> ?
> ? ? Hi canals,
> ? ? Yes, I want to make an ejb that acts as a client using sockets,
> ? I
> ? ? know that I can write client sockets in my ejbs but not server sockets,
> ? but
> ? ? the problem is that whether I can implement the ejb's ejbCreate(),
> ? ? ejbRemove(), ejbStore() and other methods through my client sockets
> ? sending
> ? ? data to and receiving data from a remote server socket, just as
> ? connecting
> ? ? to a database connection pool and make some sql operation.
> ? ?
> ? ? thanks.
> ? ?
> ? ?
> ? ? ++++++++++++++++++++++++++++
> ? ? Shanghai Huateng Software Systems Co., Ltd.
> ? ? 418 Gui Lin Road
> ? ? Shanghai, P.R.China 200233
> ? ? Tel : +86-21-6451-3533-11
> ? ? Fax : +86-21-6472-8625
> ? ? E-mail : [EMAIL PROTECTED]
> ? ? Web : http://www.huateng.com
> ? ? http://www.chinapay.com
> ? ?
> ? ? ? ----------
> ? ? ? From: Luis F. Canals[SMTP:[EMAIL PROTECTED]]
> ? ? ? Reply To: A mailing list for Enterprise JavaBeans development
> ? ? ? Sent: Friday, July 7, 2000 2:45 PM
> ? ? ? To: [EMAIL PROTECTED]
> ? ? ? Subject: Re: Socket in Entity Bean
> ? ? ?
> ? ? ? Hello Robin,
> ? ? ? If you want to listen (like a server) on a socket, you can't
> ? do it
> ? ? ? whit
> ? ? ? EJB (see Enterprise JavaBeans Specification, chap. 18, sec. 18.1.2.
> ? -you
> ? ? ? can
> ? ? ? download from http://java.sun.com/products/ejb/docs.html). If you want
> ? to
> ? ? ? make an EJB that acts as a client using sokects (I think this is
> ? you're
> ? ? ? trying, don't you?), the specification permits you.
> ? ? ?
> ? ? ? Regards.
> ? ? ?
> ? ? ? Luis F. Canals Samaniego
> ? ? ? CEDETEL
> ? ? ? Parque Tecnol??(r)gico de Boecillo
> ? ? ? Edificio Centro, Parcela 109
> ? ? ? E-47151 Boecillo (Valladolid)
> ? ? ? SPAIN
> ? ? ?
> ? ? ? Tfno: +34 983 54 65 02
> ? ? ? Fax: +34 983 54 66 96
> ? ? ?
> ? ? ?
> ? ? ? -----Mensaje original-----
> ? ? ? De: A mailing list for Enterprise JavaBeans development
> ? ? ? [mailto:[EMAIL PROTECTED]]En nombre de yu_robin
> ? ? ? Enviado el: viernes 7 de julio de 2000 8:05
> ? ? ? Para: [EMAIL PROTECTED]
> ? ? ? Asunto: Socket in Entity Bean
> ? ? ?
> ? ? ?
> ? ? ? Hi everyone,
> ? ? ? I have some data that must be fetched from a remote host through
> ? socket,
> ? ? ? and some others from a db. I want to hide the difference between
> ? these
> ? ? ? two
> ? ? ? ways of getting data upon the entity bean layer??? then session beans
> ? can
> ? ? ? get
> ? ? ? data through entity beans uniformly. Can I write socket in my bean
> ? managed
> ? ? ? entity beans?
> ? ? ? pls help me.
> ? ? ? thanks.
> ? ? ?
> ? ? ? robin
> ? ? ? ++++++++++++++++++++++++++++
> ? ? ? Shanghai Huateng Software Systems Co., Ltd.
> ? ? ? 418 Gui Lin Road
> ? ? ? Shanghai, P.R.China 200233
> ? ? ? Tel : +86-21-6451-3533-11
> ? ? ? Fax : +86-21-6472-8625
> ? ? ? E-mail : [EMAIL PROTECTED]
> ? ? ? Web : http://www.huateng.com
> ? ? ? http://www.chinapay.com
> ? ? ?
> ? ? ?
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