Q: General : When will you use Web Service as opposed to just Servlet and/or EJB?

Hi,
I don't know if this is an appropriate question to ask for this class as it's not
workshop
specific. I was wondering how will I decide when it is appropriate to use a web
service as opposed to say servlet or an EJB for my application? What is a good
rationale to use?
Thanks,
Sadhana

Hi Adam,
Thanks a lot for giving such a lucid explanation of my vague question!
I understand now the difference between when to use EJBs/Servlets/Web Services.
Thanks again!
Sadhana
"Adam FitzGerald" <[email protected]> wrote:
>
Hi Sadhana,
Web service versus Servlet versus EJB. Which one to use? That is a very
good question.
EJBs should be the core desription and processing of your business rules.
They generally
have good performance, are easy to integrate into your security set up but
they require
access using the RMI-IIOP protocol. This means that generally EJBs are not
accessible
outside of your firewall and their clients have to be written in Java (other
enterprise
objects or applets or GUI applications).
Servlets often form a web-based front end to EJBs. They also have good performance,
integrate into security and only require HTTP access. This means they are
accessible
outside your firewall and any client with a HTTP or web API can call on
them, however,
there is no standard contract or rules for this type of interaction so you
will need
provide direct input into development of the client.
Web services are also accessible via HTTP and so can be accessed from outside
your
firewall. In fact, Web services internally within Workshop and WebLogic
actually
operate by using servlets and EJBs but the main advantage is that the mechanism/contract
for interacting with the web service is a well defined standard (WSDL) and
can actually
be registered or retreived dynamically (UDDI). Since web service standards
are open,
most popular programming languages already provide client APIs to interact
with them
thus freeing the web service developer from direct interaction with the
client developer
and letting the client be developed on any platform. The penalty for this
openness
is a small performance hit (XML translation) and a slowly maturing security
model.
So in summary, use EJBs for business operations that have Java clients within
your
enterprise, use servlets to provide web style access to your business operations
(like web pages) and use web services to enable automated clients that can
be written
on any platform either inside or outside your enterprise (firewall). In
fact, it
is common to write the EJB first and then to expose some parts of it outside
of your
enterprise by writing a web service wrapper (maybe using the EJB controls
that we
saw in class).
I hope this helps.
Adam
"Sadhana Jain" <[email protected]> wrote:
Hi,
I don't know if this is an appropriate question to ask for this class as
it's not
workshop
specific. I was wondering how will I decide when it is appropriate to use
a web
service as opposed to say servlet or an EJB for my application? What is
a good
rationale to use?
Thanks,
Sadhana

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Edited by: doubleEspresso on Jan 10, 2008 8:06 AM

>
I'm fairly new to Java and web services. From what I understand, JNLP and WebStart are methods to deploy Java clients to users and not for creating war files and the like. >Correct, while Java Web Start has 'web' in the name, it has little if anything to do with web applications - certainly not providing much toward their installation. It is for launching rich client GUI based (AWT, Swing, SWT..) applications onto the end-user's desktop.
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>
..Any suggestions would be so helpful and appreciated!>You might try the forums for the 'web tier' APIs.
<http://forum.java.sun.com/category.jspa?categoryID=20>
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<http://forum.java.sun.com/forum.jspa?forumID=331>
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We were able to make this work by re-modeling my code after a code sample I found that creates new Activities.
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AddError("Error: Invalid or Missing Type")
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AddError("Error: Invalid or Missing Status")
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AddError("Error: Invalid or Missing Priority")
Exit Function
End If
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objOpportunity(0).SalesStage = "Rebuy"
objOpportunity(0).CloseDate = Date.Today
objOpportunity(0).Territory = "North America"
objOpportunity(0).stProject_Name = "FINAL SHIPMENT REBUY"
objOpportunity(0).SourceCampaign = "Rebuy"
objOpportunity(0).OpportunityType = oppType
objOpportunity(0).Revenue = POValue
objOpportunity(0).Description = Description
objOpportunity(0).bRebuy = True
objOpportunity(0).ProductInterest = partNumber
objOpportunity(0).plCurrency_Type = currency
'Connect the Opportunity to ListOfOpportunity
objListOfOpportunity.Opportunity = objOpportunity
'Connect ListofOpportunity to Input Parameter
OppInput.ListOfOpportunity = objListOfOpportunity
Opportunity.Url = servername & "/Services/Integration;jsessionid=" & sessionId
'Opportunity.CookieContainer = Session.GetCookieContainer()
Opportunity.OpportunityInsert(OppInput)
Return "success"
Catch webex As WebException
AddError(webex.Message)
Catch ex As Exception
AddError(ex.Message)
End Try
End Function
Public Function getSessionLogin(ByVal usrname As String, ByVal pass As String, ByVal servername As String)
Dim loginurl As String = servername & "/Services/Integration?command=login"
'MessageBox.Show(loginurl);
Dim req As HttpWebRequest = DirectCast(WebRequest.Create(loginurl), HttpWebRequest)
' username and password are passed as HTTP headers
req.Headers.Add("UserName", usrname)
req.Headers.Add("Password", pass)
' cookie container has to be added to request in order to
' retrieve the cookie from the response.
Dim cookie As Cookie
req.CookieContainer = New CookieContainer()
' make the HTTP callby
Dim resp As HttpWebResponse = DirectCast(req.GetResponse(), HttpWebResponse)
If resp.StatusCode = System.Net.HttpStatusCode.OK Then
' store cookie for later...
cookie = resp.Cookies("JSESSIONID")
If cookie Is Nothing Then
Return "invalid session"
End If
Return cookie.Value
Else
Return "invalid session"
End If
End Function

Crystal Reports 2008 fails when called from e Web Service under 64bit OS

I have discovered that Crystal Reports 2008 doesn't work when called from a Web Service running under 64bit Windows platforms (in my case Windows 2003 Server and Windows XP 64bit); practically no object is instantiated. I've tried several solutions without success.
Before creating a wrapper component to use under COM+, is there anybody who has a better and cheaper solution than creating another component to wrap CR 2008 ?

Hi Sergio,
Before I mark this post as assumed answered I would just like to say and re-iterate that at this time there is no one answer and we fully understand your concerns. As you know in CR 6.0 it came in 16 and 32 bit versions because at the time 32 bit was relatively new but 16 bit was the norm. This is also true for 32 to 64 bit, 32 is the norm and 64 bit is relatively new. We know and are well aware 64 bit is the future and we are working as quickly as we can to move in that direction. Because of the complexity of the Product it's not simply a matter of re-compiling all of our dll's in 64 bit format. The core of our data connectivity with our database drivers which are dependant on third party clients must also need to support 64 bit modes. This as well as Printer drivers also need to be 64 compatable, there are a multitude of dependencies that we rely on that must add 64 bit support. As a programmer you are well aware of the issues around Thunking back and forth between 32 to 64 bits, it can cause delays and potentially loss of data which is a whole other issue. Not to mention also that we would have to ship both versions potentially doubling the size of the distribution packages or doubling the size of the dll's to have the ability to work in both modes. Relatively speaking of course, it would not be double the size but the variables would need to be able to allocate 32 or 64 memory blocks.
The other option is to produce 2 separate versions, this alone is a massive project. Any issue would need to be fixed in separate code streams.
So I'm sure you can see it's not simply a matter of saying yes we support 64 bit. It's a massive project that is going to take time to do and we have to wait for the third party drivers to commit also.
Visual Studio .NET 2005 and 2008 is the only option if you want true 64 bit but you will be limited on what DB's you can support and export formats you can export to. They are the only drivers we did convert to 64 bit.
Thank you for your understanding
Don

As400 performence issue using web services

Performance degrade while accessing as400 using web services instead of MQ Connection. Any suggestion what might cause this ?
Edited by: indubala on Dec 16, 2009 6:26 PM

It is not just 1 node, you will need to do several things which I have outlined here.
In the first node set your variables.
Here the invocation class is defined.
Set this to the standard Native Invocation Class used in CCA.
If this was not defined, the Campaign should use a default invocation class but I'd advise you to specify just to be sure.
The values are:
$invocationClass
com.taw.web.invocation.WebServiceInvocation
Remember that when specifying the string value single quotes (ticks) should surround the value (as with any string in CCA Campaigns).
Next in the same node set the values for the service name.
Set this to the default of ‘invoke’ used in CCA.
If this was not defined, the Campaign should use the default of ‘invoke’ but again I'd advise on setting it to be sure.
The values are :
$serviceName
invoke
Next you will need to set the values that will be passed as the input objects to the invocation class.
Recall that the two required objects are WebServiceInvocationId and KeyValue.
The next area that would need to be defined is the Invocation wait loop.
This is done for both testing as well as operation reasons.
For testing this provides simple troubleshooting.
For production use, the loop is important to handle time outs and errors.
If the timeout value is ever reached, the return value will be set to Fail.
First set the loop counter, then in the child nodes define the Loop counter expressions to check for a specific time to wait value.
The external web service will need to be prepared to receive the exact objects sent by the Invocation class.
In addition it will also expect to be instructed to process the invoke method.
That should be enough to get you going.

HP 6700 printer will not enable web services.

My HP 6700 printer will not enable web services. I've already downloaded the firmware update, manually entered the IP and DNS numbers... shutdown the printer and turned it back on.But when i try to enable web services it try's for a while then says web services could not be enabled.. any help would be appreciated. I have vista.
This question was solved.
View Solution.

Hi there, two other things you could try (if not already attempted) are:
Check to ensure that you have the latest firmware for your router – review your router documentation/help (or the router manufacturer’s web site) for information on how to check for and install firmware updates.
Restore factory defaults - The factory default option is usually found in the Setup>Tools menu on your printer. Do the following on your device:
Remove/Disable Web Services
Restore factory defaults/settings (depending on the printer this is found under the Setup>Tools menu, or the Setup>Web Services menus, but varies by printer)
If prompted, re-do initial setup of your device and add it to your network
Re-enable Web Services
Once the Web Services information sheet is printed, use the printer claiming code to add your printer to your account on ePrintCenter
If my reply helped you, feel free to click on the Kudos button (hover over the "thumbs up").
If my reply solved your problem please click on the Accepted Solution button so other Forum users may benefit from viewing the post.
I am an HP employee.

Q: General : When will you use Web Service as opposed to just Servlet and/or EJB?

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