Best way to call EJBs from JavaBeans/JSP

Does anyone have a favorite way for getting EJB data from a JavaBean into
          your JSPs?
          I'm looking for a way of caching the EJBHome references so the beans don't
          have to do a lookup on each page, each time they are called.
          Thanks,
          -TB

How does this HelperClass keep the references cached after it looks them up?
          Is it a singleton object, or does it keep the references in static fields?
          "Argyn Kuketayev" <[email protected]> wrote in message
          news:3b1e468b$[email protected]..
          > make a HelperClass, which will have a method getXXXHome()
          > inside the Helper class you may implement cashing.
          >
          > thanks,
          > Argyn
          >
          > T. Bailey wrote in message <[email protected]>...
          > >Does anyone have a favorite way for getting EJB data from a JavaBean into
          > >your JSPs?
          > >
          > >I'm looking for a way of caching the EJBHome references so the beans
          don't
          > >have to do a lookup on each page, each time they are called.
          > >
          > >Thanks,
          > >-TB
          > >
          > >
          >
          >

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Best way to call EJB - Servlet or Tag Library

Hi,
What is the best way to call an EJB from a JSP? We are using Weblogic 7.0(moving to 8.1 beta). WE have a form on a JSP that needs to get data from an EJB. Our flow goes from JSP --> Controller servlet or tag library -->EJB "Bean" Controller ---> EJB. The specfic EJB we need to populate drop downs and fields will be called by a bean controller. Is it better to call the bean controller using a tag library in the jsp or go to the controller servlet to get the data? If servlet is the answer, where do I lookup the EJB Home and call the create from within the servlet? Any help would be greatly appreciated!!
Thanks!

IMO, if you are following some design patterns, like the MVC framework, the best thing is to populate the model(entities that contain the business data) and call the respective getXX methods from the model on the JSP page. The reason for doing so is to keep JSP pages away from any other work other than to just display the business data contained in the respective business entities.
The model can be populated in the servlet and either set in the request or session attribute as per the requirement.
The EJB can be looked up in the servlet as and when required. I would suggest to make use of the Service Locator Pattern to do a look up for the EJB Remote Interface and accordingly make the business calls.
Hopefully this answers some of your questions.

Best way to call oracle db from BPEL 2.0

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Anybody knows which is the best way to call select or call store procedures from BPEL 2.0 ? Do I need to use JCD (java collaboration definition in repository-based projects -caps 5.x) and oracle eWAY to interact with oracle database?
Regards.

You can also create a new WSDL with a concrete binding to DATABASE, as explained on http://wiki.open-esb.java.net/Wiki.jsp?page=CreatingAWSDLDocumentForTypeDATABASE
BRs
Kris

What is the best way to call a report from within a report

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A type of drill down report
Oracle Database 10g
Forms 10.1.2.0.2
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What is the best way to call a pageflow action from JavaScript?

What is the best way to call a pageflow action from JavaScript?
Thanks,
John

John,
How would I do this from a grid??? Unfortunately there are no JavaScript attributes
on any of the grid tags that I can see.
Thanks,
John
"John H" <[email protected]> wrote:
>
Thanks John!
"John Rohrlich" <[email protected]> wrote:
John,
If you want to put up a confirm dialog before calling an action from
an
anchor it is done as follows.
Here is an example from code of mine that deletes a customer order,if
the
user confirms the delete. I pass the order id as a parameter.
- john
Here is the JavaScript -
function confirmDelete() {
if(confirm('Continue with order delete?'))
return true;
else
return false;
Here is a sample anchor tag -
<netui:anchor action="requestToDeleteOrder" onClick="return
confirmDelete(); return false;">
Delete
<netui:parameter name="orderId" value="{container.item.orderId}"/>
</netui:anchor>
"John H" <[email protected]> wrote in message
news:402138f5$[email protected]..
Thanks for the replies. I figured it was going to require buildingmy own
url
to call the action. I had hoped there was an easier way to do it.Rich,
the
reason I want to do this is because I want to call the JavaScript
function
confirm()
when a user clicks on a link (in a repeater/grid) to drop a record,I only
want
to call the drop action if the user confirms the drop. Maybe thereis a
better
way to do what I am trying to do??? I really appreciate any help
you
guys
can
give me on this, I am pretty new to this sort of stuff.
Thanks,
John
"Rich Kucera" <[email protected]> wrote:
"John H" <[email protected]> wrote:
What is the best way to call a pageflow action from JavaScript?
Thanks,
JohnTry figuring out the URL to the pageflow action, create a hidden
form
in the
page, then use JS to submit the form. Why would you want to though,
isn't
the server going to want to send you to the next page?

Best way to inject EJB's in Struts 2

Hi all,
I'd like to ask you what do you think is the best way to inject EJB's in Struts 2 Actions (and perhaps other struts classes such as type converters).
I've read and implemented both a Struts 2 Interceptor and used CDI. About CDI I've read there's a discussion whether the injected resource should be a private field or injected through the constructor which would help testing.
Personally I seem to prefer CDI as it looks a bit simpler after you are familiar a bit with the technology.
What is your preferred solution and why?

Make sure you are using JDeveloper with a "regular Oracle DB" and not Oracle XE - Oracle XE doesn't have support for JPublisher.
And make sure you are trying to invoke this from the database navigator window and not from the connection manager of your application.
Anton - I think you are mixing JPublisher with something else - maybe with Java stored procedures?
JPublisher just creates a JDBC wrapper that calls the functions in the DB - it doesn't run inside the DB so I don't get your point about the mini JVM?
So it basically does exactly what you recommended: "access PL/SQL procedures from java directly?"

Call ejb from browsers

Hello Developers!
I deployed my ejb to OAS4081. I call that
from JDeveloper so it good. But when I try
to call from applet in IExpl5 I can't
instantiate the ORB. I've got a com.ms.security.SecurityException : oracle.oas.orb.CORBA.ORB.init
I coded the CLASSPATH(oasoorb(yoj),client,
ejbapi...) perfectly, I think.
If anybody could help, please...
Thanx!

Hi there,
          I saw someone on this group had a problem to locate proper classpath
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          calling the bean. But you loss all the EJB functions. To be able to utilize
          EJB features like object pooling. You need to call it from Weblogic server
          using url/jndi, not from the jar directly.
          Any comment? Am I right?
          BTW, my question about calling EJB from JSP means calling through URL,
          not a local path.
          Thank you
          >-------------------------------------------------------------------->
          Jim wrote in message <[email protected]>...
          >Hi there,
          > Can I call EJB from JSP? Is there a particular security setting or
          >concern for Weblogic? Is there an coding example?
          >
          >Thank you
          >
          >

Calling EJB from Java Stored Procedures

Hi,
I am trying to call an Enterprise Java Bean from stored procedure. This stored procedure calls a java program. As long as it is a simple java program it works fine and loadjava.exe does not give any problem (neither compile-time nor run-time).
It is not working when I am trying to call EJB from it. It is giving compile-time error.
If anybody has implemented the same please suggest how to go forward.
thanks in advance,
Shashank Agarwal

I tried the same thing without any luck. I assume you are using OC4J for your EJB ...
The compiling issue may be because you don't have the classes in your EJB client jar loaded into the database. Once those classes are loaded, you should loadjava without any problem.
However, you won't be able to call the EJB server because the EJB client (your Java code in the DB) will need the OC4J environment (oc4j.jar). I have tried to load oc4j.jar into the DB as well, and that was a big mess and nothing worked. My DB is 8.1.7, maybe the new 9i have OC4J libs bundled?!?
I looked around and only found 2 alternatives:
1. Write a JSP page that acts like an EJB client, then use URLConnection in your DB java code to send params to the JSP for it to invlode the EJB
2. Replace the JSP with RMI code, and use RMI instead of URLConnection in your DB code to invloke the EJB client.
If you find any other solution, please share it here.
Good luck!
Hi,
I am trying to call an Enterprise Java Bean from stored procedure. This stored procedure calls a java program. As long as it is a simple java program it works fine and loadjava.exe does not give any problem (neither compile-time nor run-time).
It is not working when I am trying to call EJB from it. It is giving compile-time error.
If anybody has implemented the same please suggest how to go forward.
thanks in advance,
Shashank Agarwal

Best way to read chars from InputStream

Hope this is not a too newbie question.
Suppose I have an unbuffered InputStream inputStream, what is the best way to read chars from it (in terms of performance)?
Reader reader = new BufferedReader(new InputStreamReader(inputStream));
reader.read()
or
Read reader = new InputStreamReader(new BufferedInputStream(inputStream))
reader.read()
Is there a difference between the two and if so, which one is better?
thanks.

If you are reading using a buffer of your own, then adding a buffer for binary data is a bad idea.
However for text, using a BufferedInputStream could be better as it reduces calls to the OS.
If it really matters, I suggest you do a simple performance test which runs for at least a few seconds to see what the difference is. (You should runt he test mroe than once)
Edited by: Peter__Lawrey on 20-Feb-2009 21:37

Best way to call

which is the best way to call a scotland mobile phone from skype? i been using pay as u go credit and its 8 cents a min and was wondering if a monthly thing or a subscription is the way to go

Translation patterns are for internal use to manipulate a number and then a route pattern will be responsible for pushing it out the gateway or some other method. If this DID is still being sent to you you could either manipulate this at the CUBE and hairpin it backout or send it to CUCM and hairpin it back after it gets translated with a translation pattern out a route pattern. I would recommend doing everything at the gateway unless you want to keep some record that the number is in use which CUCM can do more effectively.
This DID being used for a fax is elsewhere offnet at this point I take it? Make sure you have the proper CSS's and partitions set for hair pinning if you do this on CUCM since by nature forwarding to external numbers is disabled by default (or at least it used to be as I recall).

Calling EJB from other EJB on other J2EE Server

Can I call EJB from other EJB on other J2EE Server
Servers - Websphere 5.0
Do i require home & remote interface of that ejb on client side also
Help me, please

the problem is actually i require that is specific to websphere
for example i want to call a method ion that ejb
say my ejb name is myejb
so the normal way i should call is
InitialContext initialContext = new InitialContext();
Object homeObject = initialContext.lookup("ejb/MyEjbHome");
MyEJBHome myEJBHome =(MYEjbHome )javax.rmi.PortableRemoteObject.narrow(homeObjectMYEjbHome.class);
myEJB = lSHome.create();
myEJB.someMethod();
but here i am having class for home and remote available
now if other app server i am not having this classes then what to do

How can I access to an EJB from a JSP, using a taglib?

I'm trying to access to an EJB from a JSP using a taglib,
          and I get the example in
          http://java.sun.com/j2ee/j2sdkee/techdocs/guides/ejb/html/Advanced5.html.
          But I colund't run this example because in the weblogic Log appears many
          errors when I run the JSP.
          Can you help me?


Backing files is an option. If you need to do it from the controller, you
could use the Forward object. The forward object constructor can take a URL
object as a parameter. This should do the trick.
Regards,
Kunal
"Panji Aryaputra" <[email protected]> wrote in message
news:[email protected]..
Hi, you have to use backing file to get what you want. In my case, I am
using a page backing file. Perhaps a portlet backing file can do thatalso.
Cmiiw, the redirect header makes the page redirected only if the httpheader
has not been sent to client. In your case, the header has been sent (i.e.
the portal header.jsp has been displayed, etc). So the header need to be
sent before anything else sent to client browser. This is where thebacking
file comes handy.
hth
panji.a
"A Hagen" <[email protected]> wrote in message
news:[email protected]..
I'm using Bea Workshop 8.1 and trying to perform a redirect from inside
a
portlet
using HTTPServletResponse.sendRedirect(String url)... but nothing
happens
I tryed the same trick with a simple JSP, and that's ok, but portal
pages
obviously
catch the redirect somehow.
Please could you tell the correct way of redirecting the whole browser
to
another
page from inside portlets?
Thanks!!!

What is the best way to call SSH commands through Java technologies

What is the best way to call SSH commands through Java technologies

I don't think you can specify the password at the prompt using ssh. Plink has the -pw command option for passwords. What I did was except ssh to ask me and write the password programmatically through the outputStream I obtained from my Process object. I looked for "password: ", and then wrote the password with a trailing newline.
Both plink and ssh will also ask if you trust the host if it is the first time you are connecting to it. So before just writing the password, check if the program wants verification from you: normally supplying "y" or "n". This should only have to happen the first time the client connects. It looks like thisPLINK:
The server's host key is not cached in the registry. You
have no guarantee that the server is the computer you
think it is.
The server's key fingerprint is:
1024 f8:43:61:4c:a2:5b:77:be:5b:a7:bb:1f:f7:79:b3:b7
If you trust this host, enter "y" to add the key to
PuTTY's cache and carry on connecting.
If you want to carry on connecting just once, without
adding the key to the cache, enter "n".
If you do not trust this host, press Return to abandon the
connection.
Store key in cache? (y/n)
SSH:
The authenticity of host '127.0.0.1 (127.0.0.1)' can't be established.
RSA key fingerprint is e1:02:13:c8:52:c2:23:41:9b:5b:58:2c:18:e6:59:af.
Are you sure you want to continue connecting (yes/no)?What I did was read character by character from the inputStream until I found things of interest ... like "password: ". You only need to search for this in your method which will launch the ssh or plink Process. Once you have verifyed yourself, you can just pass commands to the Process, which is an ssh connection.
My suggestion is to read() each byte from the Process's inputStream and write it to stdout. Look and see what you need to be looking for so you can interactive with the program correctly. You can't use readLine here becuase when the ssh asks for the password it does not print a newline. I do know for sure, that ssh will simply print, "passowrd: ". Plink will print this as well if the -pw option is not supplied.

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Best way to call EJBs from JavaBeans/JSP

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