Best practice for Servlet EJB integration

          I'm wondering what the best practice is for Servlet EJB integration in terms of
          caching the home and remote objects. My understanding is that the Home object
          is threadsafe and could therefore be cached as an attribute of the Servlet. This
          would remove the need for a JNDI lookup for each request. Similarly caching the
          ProxyObject would yield further savings. However, I have noticed that most examples
          don't use either of these practices. Why not?
          Thanks in advance,
          Geordie

This has been answered repeatedly. WL allows you to cache JNDI context
          objects, ejb homes and remotes without any problems. (EJB remote interfaces
          must only be used by one thread at a time, but that requirement is provided
          by the EJB spec itself.)
          Peace,
          Cameron Purdy
          Tangosol, Inc.
          http://www.tangosol.com
          +1.617.623.5782
          WebLogic Consulting Available
          "Geordie" <[email protected]> wrote in message
          news:3af9579f$[email protected]..
          >
          > I'm wondering what the best practice is for Servlet EJB integration in
          terms of
          > caching the home and remote objects. My understanding is that the Home
          object
          > is threadsafe and could therefore be cached as an attribute of the
          Servlet. This
          > would remove the need for a JNDI lookup for each request. Similarly
          caching the
          > ProxyObject would yield further savings. However, I have noticed that
          most examples
          > don't use either of these practices. Why not?
          >
          > Thanks in advance,
          > Geordie

Similar Messages

Best Practice for Enterprise Application Integration

I would like to integrate a few corporate systems together by using Oracle Fusion Middleware. I suppose the integrated process is running in synchronous mode such that it also supports two phase commit.
In BPEL Process manager, there is a tool called "WSIF" which seems to be relevant to my requirement. I would like to know which tools should be best for my integration project and any suggestion on implementation.
Thanks in advance,
Samuel Wai

This has been answered repeatedly. WL allows you to cache JNDI context
          objects, ejb homes and remotes without any problems. (EJB remote interfaces
          must only be used by one thread at a time, but that requirement is provided
          by the EJB spec itself.)
          Peace,
          Cameron Purdy
          Tangosol, Inc.
          http://www.tangosol.com
          +1.617.623.5782
          WebLogic Consulting Available
          "Geordie" <[email protected]> wrote in message
          news:3af9579f$[email protected]..
          >
          > I'm wondering what the best practice is for Servlet EJB integration in
          terms of
          > caching the home and remote objects. My understanding is that the Home
          object
          > is threadsafe and could therefore be cached as an attribute of the
          Servlet. This
          > would remove the need for a JNDI lookup for each request. Similarly
          caching the
          > ProxyObject would yield further savings. However, I have noticed that
          most examples
          > don't use either of these practices. Why not?
          >
          > Thanks in advance,
          > Geordie

Best practice for customizing EJB property after deployment

Hi Gurus,
What is the best practice for customizing EJB property after deployment in NW7.1? I have a stateless session bean and it needs to get some environment information before acting. While the information can only be known at runtime. What should I do to achieve it? I thought I can bind the property with a JNDI context but I did not find out where to declare and change the context value. Please advise. Thanks.
B.R.

Hi.
I have a similar problem. But I still can not edit the properties of the ejb-jar.xml.
I tried to stop the web service, but the properties still remain unmodifiable.
Could you advise me how to change them?
We have installed SAP Server 7.0.2

Best Practice for Servlets

I guess I'm asking for most peoples' input on what I'm planning to do here ....
Here's what I want to do, and know a bit about.
o I want to make a servlet that serves only XML.
o After that, I want to transform the XML into web pages, RSS feeds etc.. using XSLT.
Here's what I'm not so sure about...
o How should I implement the interface to the web-based aspects? Should the servlet be coded to display HTML pages on "GET" requests? Or should I use a pile of HTML files to make forms?
o What do I use to perform the XSLT transformations? Where should the set of solutions be placed relative to my servlet? Would a user then access this solution rather than the servlet itself?
o How do I code the servlet on one machine, and then test it on another without breaking the libraries? How do I set up any libraries I might have to use (like for XSLT transformations) on the server?
Any other advice here? I'm sure this is done often, but I can't find a resource that explains the best practices for it all.
I know this sounds like a lot of stupid questions. I've had lots of programs working with Java before, but I'm at a loss as to how I'm supposed to package libraries I use in my programs - moreso with a servlet. To make matters worse, I plan on using MySQL as the database.
If there's some wizard on the forums here who's willing to say more than just "RTFM" (of which there is none to answer my questions together as one), I'd be very very happy ":^)

Let me re-pose my question so as to be specific
enough to not be picked apart in my answer.
I want to FIRST AND FOREMOST, create a servlet that
serves up XML based on parameters given to it (how?
who cares.).What does "serves up XML" mean?
Let's be precise. Do you intend the servlet to send the XML back to the client? Or is the XML an intermediate step in your processing? (Yes, it matters.)
Then, I want to create interfaces (HTML, RSS,
boogledeedoo) to this XML data by having either JSP,
another servlet or insert something else here,
transform the XML into whatever the desired format
is."interface" is a loaded term in Java. What do you mean by it?
>
My assumption is that I'll make the servlet that is
capable of outputting my desired XML data and then
create another servlet that will poke it for data as
needed to transform the XML into HTML. This servlet
would also likely serve as the web site itself and
would manage user logins etc...(persistance yaddy
yadda)You're not thinking about this properly.
"yadda yadda" == muddled thinking.
My other assumption is that I'll make another servlet
that will poke the XML servlet and transform that
into RSS or anything else I can dream up.How does "poke the XML servlet" fit into the request/response protocol that is HTTP? Please explain.
-=-!REASONING!-=-
Previously, when I was working with PHP, I liked to
make scripts that would display interfaces and post
to themselves. OK, now I see. "interface" == GUI in a browser to you. Very good.
You can create a JSP that is an interface. You can have that JSP submit the HTTP POST or GET request to itself. No problem there, as long as "itself" knows what to do with the request.
It was a nice way of creating a
complete little package. Everything for one function
was encapsulated nicely under one roof. No excessive
HTML files all over the place to nurture.A simple problem, a simple solution. You can do that with a JSP.
Look. Part of my inability to describe this well is
because I DO feel like I'm in a lot of directions at
once. Or you don't understand the technology very well.
But I have to be in order to pull together
some sort of plan for myself. I understand many
concepts and have just finished studying object
oriented design etc..."Just finished"? How long did it take?
I know things about how Tomcat does connection
pooling for SQL connections.Great. Not much to understand there. It's harder to figure out how to do n-tier apps with more than one page well.
I do know how to use Google, probably a lot better
than most. But rest assured, I've yet to find a
little guide as complete as any of the "LAMP" books
there are out there. Which by the way, I have never
purchased.That's because Java Enterprise Edition isn't intended for little problems. LAMP is. Maybe the limitation is that you are used to "little" problems and not bigger ones.
If JEE seems scattered and complex, it's because it is. It encompasses more than LAMP.
I'm confident in good guidance, and not a heartfelt
smackdown. I'm still waiting for some clear suggestions.I gave you one, you just didn't know it: go read about Spring.
http://www.springframework.org
It'll help you structure complex apps from the user interface to the database in the back.
You're welcome.
%

Best practice for integrating a 3 point metro-e in to our network.

Hello,
We have just started to integrate a new 3 point metro-e wan connection to our main school office. We are moving from point to point T-1?s to 10 MB metro-e. At the main office we have a 50 MB going out to 3 other sites at 10 MB each. For two of the remote sites we have purchase new routers ? which should be straight up configurations. We are having an issue connecting the main office with the 3rd site.
At the main office we have a Catalyst 4006 and at the 3rd site we are trying to connect to a catalyst 4503.
I have attached configurations from both the main office and 3rd remote site as well as a basic diagram of how everything physically connects. These configurations are not working ? we feel that it is a gateway type problem ? but have reached no great solutions. We have tried posting to a different forum ? but so far unable to find the a solution that helps.
The problem I am having is on the remote side. I can reach the remote catalyst from the main site, but I cannot reach the devices on the other side of the remote catalyst however the remote catalyst can see devices on it's side as well as devices at the main site.
We have also tried trunking the ports on both sides and using encapsulation dot10q ? but when we do this the 3rd site is able to pick up a DHCP address from the main office ? and we do not feel that is correct. But it works ? is this not causing a large broad cast domain?
If you have any questions or need further configuration data please let me know.
The previous connection was a T1 connection through a 2620 but this is not compatible with metro-e so we are trying to connect directly through the catalysts.
The other two connection points will be connecting through cisco routers that are compatible with metro-e so i don't think I'll have problems with those sites.
Any and all help is greatly welcome ? as this is our 1st metro e project and want to make sure we are following best practices for this type of integration.
Thank you in advance for your help.
Jeff

Jeff, form your config it seems you main site and remote site are not adjacent in eigrp.
Try adding a network statement for the 171.0 link and form a neighbourship between main and remote site for the L3 routing to work.
Upon this you should be able to reach the remote site hosts.
HTH-Cheers,
Swaroop

Best practice for integrating oracle atg with external web service

Hi All
What is the best practice for integrating oracle atg with external web service? Is it using integration repository or calling the web service directly from the java class using a WS client?
With Thanks & Regards
Abhishek

Using Integration Repository might cause performance overhead based on the operation you are doing, I have never used Integration Repository for 3rd Party integration therefore I am not able to make any comment on this.
Calling directly as a Java Client is an easy approach and you can use ATG component framework to support that by making the endpoint, security credentials etc as configurable properties.
Cheers
R
Edited by: Rajeev_R on Apr 29, 2013 3:49 AM

Best Practice For Referencing JPEG Path Using Servlets To Prepare HTML IMG

I am migrating a legacy app from Tomcat 5 to Weblogic 11g (10.3). In the legacy app, servlets write HTML that uses relative paths for <IMG src="../images/img.jpeg"> and <script src="../javascript/js.js">. The app is deployed as an exploded archive. Unfortunately, none of the images or script are being loaded. I've tried using http://serverIP:portNum/contextName/images/img.jpeg"> but it doesn't work. I've also checked to get the name of the context in the servlet and it's the root context. Could it have something to do with me having to append .war onto the application when I deploy it? Would it help if I deployed it as a war inside an ear? Basically, I want some best practices for doing this on Weblogic 11g. There are a lot of images and javascript and I'm really hoping they don't have to be inserted using ClassLoader.getResourceAsStream()... thank you.

Best Practice:
1. Move Static files like images, css, java scripts to a web server infrastructure if available.
2. If this is not your case, then please send your directory information how you have packaged your EAR. I can advice :)

Best practices for apps integration with third party systems ?

Hi all
I would like to know if there is any document from oracle or from your own regarding best practices for apps integration with third party systems.
For example, in particular, let's say we need customization in a given module(ex:payables) need to provide data to a third party system, consider following:
outbound interface:
1)should third party system should be given with direct access to oracle database to access a particular payments data information table/view to look for data ?
2) should oracle create a file to third party system, so that it can read and do what it need to do?
inbound:
1) should third party should directly login and insert data into tables which holds response data?
2) again, should third party create file and oralce apps will pick up for further processing?
again, there could be lot of company specific scenarios like it has to be real time or not... etc...
How does companies make sure third party systems are not directly dipping into other systems (oracle apps/others), so that it will follow certain integration best practices.
how does enterprise architectute will play a role in this? can we apply SOA standards? should use request/reply using Tibco etc?
Many oracle apps implementations customizations are more or less directly interacting with third party systems by including code to login into respective third party systems and vice versa.
Let me your know if you have done differently and that would help oracle apps community.
thanks
rrb.

you want to send idoc to third party system (NONSAP).
what kind of system is it? can it handle http requests
or
can it handle webservice?
which version of R/3 you are using?
what is the mechanism the receiving system has, to receive data?
Regards
Raja

Tips n Tricks/Best Practices for integrating iPhone, iPad and MacBook Pro

My wife just purchased an iPhone, iPad and Macbook Pro for her non profit consulting business and I was wondering if a tips and tricks or best practices for efficiently and productively integrating these devices exists?

http://www.apple.com/icloud/

Best practice for a deplomyent (EAR containing WAR/EJB) in a productive environment

Hi there,
I'm looking for some hints regarding to the best practice deployment in a productive
environment (currently we are not using a WLS-cluster);
We are using ANT for buildung, packaging and (dynamic) deployment (via weblogic.Deployer)
on the development environment and this works fine (in the meantime);
For my point of view, I would like to prefere this kind of Deploment not only
for the development, also for the productive system.
But I found some hints in some books, and this guys prefere the static deployment
for the p-system.
My question now:
Could anybody provide me with some links to some whitepapers regarding best practice
for a deployment into a p-system ??
What is your experiance with the new two-phase-deploment coming up with WLS 7.0
Is it really a good idea to use the static deployment (what is the advantage of
this kind of deployment ???
THX in advanced
-Martin

Hi Siva,
What best practise are you looking for ? If you can be specific on your question we could provide appropriate response.
From my basis experience some of the best practices.
1) Productive landscape should have high availability to business. For this you may setup DR or HA or both.
2) It should have backup configured for which restore has been already tested
3) It should have all the monitoring setup viz application, OS and DB
4) Productive client should not be modifiable
5) Users in Production landscape should have appropriate authorization based on SOD. There should not be any SOD conflicts
6) Transport to Production should be highly controlled. Any transport to Production should be moved only with appropriate Change Board approvals.
7) Relevant Database and OS security parameters should be tested before golive and enabled
8) Pre-Golive , Post Golive should have been performed on Production system
9) EWA should be configured atleast for Production system
10) Production system availability using DR should have been tested
Hope this helps.
Regards,
Deepak Kori

Best practice for placing module

Hello
I have an enterprise application project, with :
1) EJB Module
2) Web Module .
I want to add the hibernate jars+classes+data+servlets+utils etc...
Should i create a new Web module for hibernate or should i add it to the existing EJB module which is my business logic ?
What is the best practice for that?
Thanks !

Thanks for the reply, Jiri.
I believe that the answer is 'yes' to both of your questions above. I do have a question about the formatting of the meta tag itself, as my main question is how do I extract the needed information from a particular CDF so that it is displayed in the <head> section located in the page template.
I have a Region Definition for the content section of my page with a 'Title' field, which a contributor can fill in, save, and create a Contributor Data File with their own specified title. Let's also say that my page template, which formats the entire page, looks like this (rough):
<html>
<head>
<title>Web page</title>
</head>
<body>



</body>
</html>
What would my <meta> tag look like for the following:
<meta property="og:title" content="Title of the content section"/>
Let's name our templates/definitions:
Page Template: PT_META
Region Template: RT_META
Region Definition: RD_META
Contributor Data File: CDF_META
In other words, how do I extract the information included in the Contributor Data File (as well as its metadata) for use in the Page Template? Is there some sort of Idoc Script call that can be used?
Thank you so much,
Josh

Best Practices for Using Photoshop (and Computing in General)

I've been seeing some threads that lead me to realize that not everyone knows the best practices for doing Photoshop on a computer, and in doing conscientious computing in general. I thought it might be a good idea for those of us with some exprience to contribute and discuss best practices for making the Photoshop and computing experience more reliable and enjoyable.
It'd be great if everyone would contribute their ideas, and especially their personal experience.
Here are some of my thoughts on data integrity (this shouldn't be the only subject of this thread):
Consider paying more for good hardware. Computers have almost become commodities, and price shopping abounds, but there are some areas where spending a few dollars more can be beneficial. For example, the difference in price between a top-of-the-line high performance enterprise class hard drive and the cheapest model around with, say, a 1 TB capacity is less than a hundred bucks! Disk drives do fail! They're not all created equal. What would it cost you in aggravation and time to lose your data? Imagine it happening at the worst possible time, because that's exactly when failures occur.
Use an Uninterruptable Power Supply (UPS). Unexpected power outages are TERRIBLE for both computer software and hardware. Lost files and burned out hardware are a possibility. A UPS that will power the computer and monitor can be found at the local high tech store and doesn't cost much. The modern ones will even communicate with the computer via USB to perform an orderly shutdown if the power failure goes on too long for the batteries to keep going. Again, how much is it worth to you to have a computer outage and loss of data?
Work locally, copy files elsewhere. Photoshop likes to be run on files on the local hard drive(s). If you are working in an environment where you have networking, rather than opening a file right off the network, then saving it back there, consider copying the file to your local hard drive then working on it there. This way an unexpected network outage or error won't cause you to lose work.
Never save over your original files. You may have a library of original images you have captured with your camera or created. Sometimes these are in formats that can be re-saved. If you're going to work on one of those files (e.g., to prepare it for some use, such as printing), and it's a file type that can be overwritten (e.g., JPEG), as soon as you open the file save the document in another location, e.g., in Photoshop .psd format.
Save your master files in several places. While you are working in Photoshop, especially if you've done a lot of work on one document, remember to save your work regularly, and you may want to save it in several different places (or copy the file after you have saved it to a backup folder, or save it in a version management system). Things can go wrong and it's nice to be able to go back to a prior saved version without losing too much work.
Make Backups. Back up your computer files, including your Photoshop work, ideally to external media. Windows now ships with a quite good backup system, and external USB drives with surprisingly high capacity (e.g., Western Digital MyBook) are very inexpensive. The external drives aren't that fast, but a backup you've set up to run late at night can finish by morning, and if/when you have a failure or loss of data. And if you're really concerned with backup integrity, you can unplug an external drive and take it to another location.
This stuff is kind of "motherhood and apple pie" but it's worth getting the word out I think.
Your ideas?
-Noel

APC Back-UPS XS 1300. $169.99 at Best Buy.
Our power outages here are usually only a few seconds; this should give my server about 20 or 25 minutes run-time.
I'm setting up the PowerChute software now to shut down the computer when 5 minutes of power is left. The load with the monitor sleeping is 171 watts.
This has surge protection and other nice features as well.
-Noel

Best Practices for Defining NDS Java Projects...

We are doing a Proof of Concept on using NDS to develop non-SAP Java applications. We are attempting to determine if we can replace our current Java development tools with NDS/WAS.
We are struggling with SAP's terminology and "plumbing" for setting up/defining Java projects. For example, what is and when do you define Tracks, Software Components, Development Components, etc. All of these terms are totally foreign to us and do not relate to our current Java environment (at least not that we can see). We are also struggling with how the DTR and activities tie in to those components.
If any one has defined best practices for setting up Java projects or has struggled with and overcome these same issues, please provide us with some guidance. This is a very frustrating and time-consuming issue for us.
Thank you!!

Hi Peggy,
In Component Model we divide software projects into small components.Components can use other components in well defined manner.
A development object is a part of a component that can be changed or developed in some way; it provides the component with a certain part of its functionality. A development object may be a Java class, a Web Dynpro view, a table definition, a JSP page, and so on. Development objects are always stored as sources in a repository.
A development component can be defined as a frame shared by a number of objects, which are part of the software.
Software components combine components (DCs) to larger units for delivery and deployment.
A track comprises configurations and runtime systems required for developing software component versions.It ensures stable states of deliverables used by subsequent tracks.
The Design Time Repository is for versioning source code management. Distributed development of software in teams. Transport and replication of sources.
You can also find lot of support in SDN for the above concepts with tutorials.
Refer this Link for a overview on Java development Infrastructure(JDI)
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/webas/java/java development infrastructure jdi overview.pdf
To understand further
Working with Net Weaver Development Infrastructure :
http://help.sap.com/saphelp_nw04/helpdata/en/03/f6bc3d42f46c33e10000000a11405a/content.htm
In the above link you can find all the concepts clearly explained.You can also find the required tutorials for development.
Regards,
Vijith

Best practice for declaring and initializing String?

What is the best practice for the way Strings are declared in a class?
Should it be
private String strHello = "";
or should I have the initialization in the constructors?

The servlet constructor is usually called once, when the servlet is first accessed. But then again maybe something else happens, google servlet life cycle if you must know.
But let's take a step backwards here. It seems like you are trying to put fields into servlets. Don't do that. When two users fetch the servlet's URL at the same time, the fields are shared between the two hits. If you store something like HTTP parameters in the fields, the two hits' parameters will get mangled. The hits can end up seeing each other's parameter values.
The best way is not to have fields in servlets. (Except maybe "static final" constants, sometimes rarely something else.) Many concurrency worries go away, servlet life cycle worries go away, servlet constructors go away, init() usually goes away.

Best Practice for SRST deployment at a remote site

What is the best practice for a SRST deployment at a remote site? Should a separate router such as a 3800 series be deployed for telephony in addition to another router to be deployed for Data? Is there a need for 2 different devices?

Hi Brian,
This is typically done all on one ISR Router at the remote site :)There are two flavors of SRST. Here is the feature comparison;
SRST Fallback
This feature enables routers to provide call-handling support for Cisco Unified IP phones if they lose connection to remote primary, secondary, or tertiary Cisco Unified Communications Manager installations or if the WAN connection is down. When Cisco Unified SRST functionality is provided by Cisco Unified CME, provisioning of phones is automatic and most Cisco Unified CME features are available to the phones during periods of fallback, including hunt-groups, call park and access to Cisco Unity voice messaging services using SCCP protocol. The benefit is that Cisco Unified Communications Manager users will gain access to more features during fallback ****without any additional licensing costs.
Comparison of Cisco Unified SRST and
Cisco Unified CME in SRST Fallback Mode
Cisco Unified CME in SRST Fallback Mode
â¢ First supported with Cisco Unified CME 4.0: Cisco IOS Software 12.4(9)T
â¢ IP phones re-home to Cisco Unified CME if Cisco Unified Communications Manager fails. CME in SRST allows IP phones to access some advanced Cisco Unified CME telephony features not supported in traditional SRST
â¢ Support for up to 240 phones
â¢ No support for Cisco VG248 48-Port Analog Phone Gateway registration during fallback
â¢ Lack of support for alias command
â¢ Support for Cisco UnityÂ® unified messaging at remote sites (Distributed Exchange or Domino)
â¢ Support for features such as Pickup Groups, Hunt Groups, Basic Automatic Call Distributor (BACD), Call Park, softkey templates, and paging
â¢ Support for Cisco IP Communicator 2.0 with Cisco Unified Video Advantage 2.0 on same computer
â¢ No support for secure voice in SRST mode
â¢ More complex configuration required
â¢ Support for digital signal processor (DSP)-based hardware conferencing
â¢ E-911 support with per-phone emergency response location (ERL) assignment for IP phones (Cisco Unified CME 4.1 only)
Cisco Unified SRST
â¢ Supported since Cisco Unified SRST 2.0 with Cisco IOS Software 12.2(8)T5
â¢ IP phones re-home to SRST router if Cisco Unified Communications Manager fails. SRST allows IP phones to have basic telephony features
â¢ Support for up to 720 phones
â¢ Support for Cisco VG248 registration during fallback
â¢ Support for alias command
â¢ Lack of support for features such as Pickup Groups, Hunt Groups, Call Park, and BACD
â¢ No support for Cisco IP Communicator 2.0 with Cisco Unified Video Advantage 2.0
â¢ Support for secure voice during SRST fallback
â¢ Simple, one-time configuration for SRST fallback service
â¢ No per-phone emergency response location (ERL) assignment for SCCP Phones (E911 is a new feature supported in SRST 4.1)
http://www.cisco.com/en/US/prod/collateral/voicesw/ps6788/vcallcon/ps2169/prod_qas0900aecd8028d113.html
These SRST hardware based restrictions are very similar to the number of supported phones with CME. Here is the actual breakdown;
Cisco 880 SRST Series Integrated Services Router
Up to 4 phones
Cisco 1861 Integrated Services Router
Up to 8 phones
Cisco 2801 Integrated Services Router
Up to 25 phones
Cisco 2811 Integrated Services Router
Up to 35 phones
Cisco 2821 Integrated Services Router
Up to 50 phones
Cisco 2851 Integrated Services Router
Up to 100 phones
Cisco 3825 Integrated Services Router
Up to 350 phones
Cisco CatalystÂ® 6500 Series Communications Media Module (CMM)
Up to 480 phones
Cisco 3845 Integrated Services Router
Up to 730 phones
*The number of phones supported by SRST have been changed to multiples of 5 starting with Cisco IOS Software Release 12.4(15)T3.
From this excellent doc;
http://www.cisco.com/en/US/prod/collateral/voicesw/ps6788/vcallcon/ps2169/data_sheet_c78-485221.html
Hope this helps!
Rob

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