How does Webservices and EJB's differ?

I have to call some of the api's from the remote application.I just wanted to know which would be better approach to call those methods?Should i do with EJB or webservices?

The main advantage of using webservices is to decouple the client and endpoint as much as
possible. This gives you the flexibility of coding the client with a variety of technologies, not
just Java. It is also a better choice if the client is being developed by either another organization
or is running outside your firewall.
However, with loose coupling comes some disadvantages. The development model is
a bit more complex than using Remote EJB. It is also more difficult to portably
support transaction and security propagation.
--ken

Similar Messages

How does mix and match works in ECC6.0?

How does mix and match works in ECC 6.0?
Can some shared on this topic?
Thanks in advance

It;s a term used in Retail for combination of sales item eg buy 3 get 1 any other @ xx price.

How does failover and load distribution work in Operations Manager resource pools?

Hello everyone,
I have a couple of questions in regard to failover and load distribution in resource pools.
What is the criteria for an x-plat or network device to initiate a failover?
How is load distributed in a resource pool - Is it round-robin, performance based or something completely different?
In case more than two management servers are in the same pool, and a management server becomes unavailable, how is load distributed among the remaining resource pool members?
Any help is appreciated.
Thx,
Claus

Hi,
Resource Pools are a collection of Health Services working together to manage instances assigned to the pool.
Workflows targeted to the instances are loaded by the Health Service in the Resource Pool that ends up managing that instance.
If one of the Health Services in the Resource pool were to fail, the other Health Services in the pool will pick up the work that the failed member was running.
And I would like to share this article with you. Hope it helps.
http://www.systemcentercentral.com/how-does-the-failover-process-work-in-opsmgr-2012-scom-sysctr/
Niki Han
TechNet Community Support

How does QoS and Queueing work?

Hello,
I am new to QoS/Networking and I have a few questions so I hope you can help me.
1. ToS is older than DiffServ so how does the router know that the bits are set by DiffServ and not ToS?
2. Why should I use L3 prioritization instead of L2? If I have Switches on the way from the frame I have to use L2 priorization right?
3. Do I need L2 and L3 priorization if I use Router and Switches or is the Router able to interpret the 802.1p CoS Tags, too?
4. I don't understand the way how Cisco Switches are queueing traffic. I read about some specification like "1P4Q4T". I know it's about priority- and standart queues and bandwith thresholds but how does they work?
4.1 How do you define the bandwith thresholds? What does 4 thresholds mean?
4.2 How are the Queues used if I don't use QoS?
4.3 How are the queues used if I prioritize 1 VLAN?
I watched a few tutorials and read a lot in the world wide web but I haven't found the answers, yet. I hope you can help me.
Best Regards,
Veit

Did nobody have an answer for those questions?

How does servicegen choose EJBs to generate webservices?

I'd like to know how servicegen Ant task chooses the EJBs to generate webservice operations from. In one of my sample applications the ejbgen Ant task (com.bea.wls.ejbgen.ant.EJBGenAntTask) generates stateless session beans. Servicegen then generates webservice operations for each of the public methods defined in the stateless session beans.
If a similar session bean is generated using XDoclet (xdoclet.modules.ejb.EjbDocletTask) instead of "ejbgen", servicegen does not find any operation to create webservices from! The <operations>-Element in the generated web-services.xml is empty (see error message below).
Are there any naming conventions a generator of EJB-Code should follow if the generated JAR file is used as input for servicegen afterwards?
<servicegen
<service
ejbJar="${build}/${ejb_jar_file}"
>
</service>
</servicegen>
weblogic.webservice.dd.DDProcessingException: There must be at least one <operation> element in <operations> (Line 14, Column 8)
at weblogic.webservice.dd.DDLoader.processOperationElements(DDLoader.java:1000)
at weblogic.webservice.dd.DDLoader.processOperationsElement(DDLoader.java:986)
at weblogic.webservice.dd.DDLoader.processWebServiceElement(DDLoader.java:497)
at weblogic.webservice.dd.DDLoader.processWebServiceElements(DDLoader.java:310)
at weblogic.webservice.dd.DDLoader.processWebServicesElement(DDLoader.java:298)
at weblogic.webservice.dd.DDLoader.load(DDLoader.java:276)
at weblogic.webservice.util.WebServiceWarFile.getWSDD(WebServiceWarFile.java:86)
at weblogic.webservice.tools.build.internal.WSDLGenImpl.getWebServiceMBean(WSDLGenImpl.java:194)
at weblogic.webservice.tools.build.internal.WSDLGenImpl.run(WSDLGenImpl.java:133)
at weblogic.webservice.tools.build.internal.ClientGenImpl.doClientGenFromEAR(ClientGenImpl.java:438)
at weblogic.webservice.tools.build.internal.ClientGenImpl.run(ClientGenImpl.java:345)
at weblogic.ant.taskdefs.webservices.servicegen.ServiceGenTask.generateClient(ServiceGenTask.java:597)
at weblogic.ant.taskdefs.webservices.servicegen.ServiceGenTask.execute(ServiceGenTask.java:195)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
at org.apache.tools.ant.Task.perform(Task.java:364)
at org.apache.tools.ant.Target.execute(Target.java:341)
at org.apache.tools.ant.Target.performTasks(Target.java:369)
at org.apache.tools.ant.Project.executeTarget(Project.java:1214)
at org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.run(InternalAntRunner.java:385)
at org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.main(InternalAntRunner.java:136)

Hi lerppu
I got same error messages. could you please post how you have solved this problem. i'm a student and is pretty new to j2ee projects. you help would be appreciated.
thanks in advance.

BC4J Question: How does AM and Connection Pooling work?

Hello everybody,
we are just trying to understand what exactly happens when a BC4J Application Module is created / when a AM is checked out of the pool with respect to Connection and Application Module Pooling. Especially we would like to understand what ConnectionStartegies, EnvInfoProvider and SessionCookies exactly do and when and how to customize them. Especially we would like to use features like virtual private databases (VPD) and proxy authentication (a feature of the Oracle OCI JDBC driver) with BC4J application modules. We found the HowTo about using JAAS and VPDs with BC4J (http://otn.oracle.com/products/jdev/howtos/bc4j/bc4jvpdjaas.html) but there are still questions, e.g. when is the afterConnect() method of an ApplicationModuleImpl called? During the instanciation of an AM or every time it's check out of the pool?
Any info on this topic would be very welcome!
Regards
Stefan

Hi,
1. Setting jbo.doconnectionpooling=false ,
connection pool still exists.
Is it correct ? When you set this parameter to false, you are saying that Connection Pool is not managed by AM, so you need to specify a JNDI Name in Application Module to use a Pool not managed by AM.
2. There is one situation to set
jbo.doconnectionpooling=true. The article said
"when you have a large number of application
module pools all needing to database connections
from the same underlying application user at the
database level. In this case, the many application
module pools can perhaps economize on the total
overall database sessions by sharing a single,
underlying database connection pool of JDBC
connections, albeit at a loss of efficiency of each
one. This choice would be favored only if total
overall database sessions is of maximum priority. "
Does it mean that if we set it to true when we
have many many AM instances and we cannot afford to
have such number of connection instance in the pool
? It's means that the JDBC connections will be shared avoid new Connection at time.
Normally i use Connection Pool not managed by Application Module.
Bye

How does idx and sub files work?

How can I get idx and sub files to work on quicktime and apple tv? I have a mp4 movie with those subtitle files and wonder how they work.
Message was edited by: elangsru

Go to ine.com and sign up for a free membership. They offer free streaming of the CCNA R/S and CCNA Voice videos. You can also use Google to find many resources to read on.

How does "create and wire unwired cases" work? I can't get it to do anything....

Ok, I have an event structure with a ton of events.
I've just added a value that goes through it...this value is a shift register on the outter loop.
I see that when your right click the tunnel on the event...there is the switch to turn off "Use Default if Un-wired".
I also see some options that appear to do what I want to do...and that is to wired all unwired connections on the other events with "Linkted Input Tunnels" -> "Create & Wire Unwired Cases".
When I click this..the cursor turns to a new shape...but from here...I cannot figure how to get this to work...I've tried right clicking on the 'broken' tunnel at that end....I've tried left clicking in an event that is unwired....but nothing.
Can someone help me here...I think this is what I want...but can't get it to work.
Thank you in advance,
cayenne
Solved!
Go to Solution.

cayenne wrote:
Ok, I have an event structure with a ton of events.
I've just added a value that goes through it...this value is a shift register on the outter loop.
I see that when your right click the tunnel on the event...there is the switch to turn off "Use Default if Un-wired".
I also see some options that appear to do what I want to do...and that is to wired all unwired connections on the other events with "Linkted Input Tunnels" -> "Create & Wire Unwired Cases".
When I click this..the cursor turns to a new shape...but from here...I cannot figure how to get this to work...I've tried right clicking on the 'broken' tunnel at that end....I've tried left clicking in an event that is unwired....but nothing.
Can someone help me here...I think this is what I want...but can't get it to work.
Thank you in advance,
cayenne
This option is used when you have large number of case structures and the wireing terminal is same. If you want to understand those things do these things
Create an Enum with 4 elements
Create a state machine design pattern but wire only one case to the shift register and leave the other cases un wired
Go to the unwired case at the right click the unwired terminal and select Create & Wire Unwired Cases you will get a wire bundle click that in the input terminal that connects the output
Undo the previous one and go to the wired case and right click the termianl at the right side of the case structure and select the same Create & Wire Unwired Cases.
I guess the explanation is clear
The best solution is the one you find it by yourself

How does decode and case works?

Hi,
I want to know how decode and case works? How they process the arguements. Please explain me with some examples.
Thanks,
Sarav
Edited by: 943941 on Jul 3, 2012 1:42 AM

welcome
check this link
https://forums.oracle.com/forums/ann.jspa?annID=1535
you will find everything you need
DECODE compares expr to each search value one by one. If expr is equal to a search, then Oracle Database returns the corresponding result. If no match is found, then Oracle returns default. If default is omitted, then Oracle returns null.
This example decodes the value warehouse_id. If warehouse_id is 1, then the function returns 'Southlake'; if warehouse_id is 2, then it returns 'San Francisco'; and so forth. If warehouse_id is not 1, 2, 3, or 4, then the function returns 'Non domestic'.
SELECT product_id,
       DECODE (warehouse_id, 1, 'Southlake',
                             2, 'San Francisco',
                             3, 'New Jersey',
                             4, 'Seattle',
                                'Non domestic')
       "Location of inventory" FROM inventories
       WHERE product_id < 1775;Edited by: user 007 on Jul 3, 2012 2:40 PM

How does db_rep_heartbeat_send (and ~_monitor) affect overall throughput?

Dear experts,
I'm testing performance of BerkeleyDb 11gR2 replication using replication manager example code(ex_rep_mgr).
I slightly modified "rep_common.c" and "rep_mgr.c" to do 'put' repeatedly.
And I measured elapse time for several iterations.
Strangely, when I used following (as original rep_mgr example has)
DB_REP_HEARTBEAT_SEND = 1000000
DB_REP_HEARTBEAT_MONITOR = 10000000
I got very poor performance. (25 transactions per sec.)
But I reduced the value of DB_REP_HEARTBEAT_SEND to 500000, I got more performance.
(650~700 txn per sec)
I configured BerkeleyDb as in-memory. (didn't specified db filename, put log in memory and so on)
1 Master and 1 Client.
And ack_policy was DB_REPMGR_ACKS_ONE
1 txn was inserting 5 rows to table with an 'int-typed' key and 100 bytes-length of value.
I'm curious to know the relation of heartbeat mechanism and throughput.
How can I set heartbeat related parameters for maximum throughput?
I turned off those parameters by setting '0', but result was not good.
Any comment would be very appreciated.
Thank you.

I'm using Ubuntu.
(Linux 2.6.22-15-generic #1 SMP Tue Oct 21 23:47:12 GMT 2008 i686 GNU/Linux)
and Berkeley DB 11gR2 5.0.21
And both master and client process runs in a same machine as follows
$ ex_rep_mgr -M -h DIR1 -l localhost:6000 -n 2 -p 100 -v
$ ex_rep_mgr -C -h DIR2 -l localhost:6001 -r localhost:6000 -n 2 -p 200 -v
Followings are verbose messages when I ran my scenario once.
Thank you.
[[[[[[[[[[ master side ]]]]]]]]]]]]]]]
CMD> xxx
Runing XXX Scenario...
[1271072497:301378][5064/3082791104] ex_rep_mgr: DIR1 rep_send_message: msgv = 5 logv 17 gen = 1 eid -1, type log, LSN [1][26316]
[1271072497:301671][5064/3082791104] ex_rep_mgr: DIR1 rep_send_message: msgv = 5 logv 17 gen = 1 eid -1, type log, LSN [1][26384]
[1271072497:301747][5064/3082791104] ex_rep_mgr: DIR1 rep_send_message: msgv = 5 logv 17 gen = 1 eid -1, type log, LSN [1][26548]
[1271072497:301818][5064/3082791104] ex_rep_mgr: DIR1 rep_send_message: msgv = 5 logv 17 gen = 1 eid -1, type log, LSN [1][26616]
[1271072497:301873][5064/3082791104] ex_rep_mgr: DIR1 rep_send_message: msgv = 5 logv 17 gen = 1 eid -1, type log, LSN [1][26780]
[1271072497:301913][5064/3082791104] ex_rep_mgr: DIR1 rep_send_message: msgv = 5 logv 17 gen = 1 eid -1, type log, LSN [1][26848]
[1271072497:301961][5064/3082791104] ex_rep_mgr: DIR1 rep_send_message: msgv = 5 logv 17 gen = 1 eid -1, type log, LSN [1][27012]
[1271072497:302001][5064/3082791104] ex_rep_mgr: DIR1 rep_send_message: msgv = 5 logv 17 gen = 1 eid -1, type log, LSN [1][27080]
[1271072497:302048][5064/3082791104] ex_rep_mgr: DIR1 rep_send_message: msgv = 5 logv 17 gen = 1 eid -1, type log, LSN [1][27244]
[1271072497:302087][5064/3082791104] ex_rep_mgr: DIR1 rep_send_message: msgv = 5 logv 17 gen = 1 eid -1, type log, LSN [1][27312]
[1271072497:302144][5064/3082791104] ex_rep_mgr: DIR1 rep_send_message: msgv = 5 logv 17 gen = 1 eid -1, type log, LSN [1][27476] flush perm
[1271072497:302178][5064/3082791104] ex_rep_mgr: will await acknowledgement: need 1
[1271072497:350173][5064/3070348176] ex_rep_mgr: got ack [1][27476](1) from site localhost:6001
Total Time : 0.049870 seconds..
--> TPS : 20.05
TPS = 20
...Done
CMD>
[[[[[[[[[[ client side ]]]]]]]]]]]]]]]
CMD (read-only)> [1271072497:303163][5079/3045759888] ex_rep_mgr: DIR2 rep_process_message: msgv = 5 logv 17 gen = 1 eid 0, type log, LSN [1][26316]
[1271072497:303267][5079/3045759888] ex_rep_mgr: rep_apply: Set apply_th 1
[1271072497:303340][5079/3045759888] ex_rep_mgr: rep_apply: Decrement apply_th 0 [1][26384]
[1271072497:348431][5079/3045759888] ex_rep_mgr: DIR2 rep_process_message: msgv = 5 logv 17 gen = 1 eid 0, type log, LSN [1][26384]
[1271072497:348493][5079/3045759888] ex_rep_mgr: rep_apply: Set apply_th 1
[1271072497:348527][5079/3045759888] ex_rep_mgr: rep_apply: Decrement apply_th 0 [1][26548]
[1271072497:348551][5079/3045759888] ex_rep_mgr: DIR2 rep_process_message: msgv = 5 logv 17 gen = 1 eid 0, type log, LSN [1][26548]
[1271072497:348589][5079/3045759888] ex_rep_mgr: rep_apply: Set apply_th 1
[1271072497:348617][5079/3045759888] ex_rep_mgr: rep_apply: Decrement apply_th 0 [1][26616]
[1271072497:348640][5079/3045759888] ex_rep_mgr: DIR2 rep_process_message: msgv = 5 logv 17 gen = 1 eid 0, type log, LSN [1][26616]
[1271072497:348663][5079/3045759888] ex_rep_mgr: rep_apply: Set apply_th 1
[1271072497:348686][5079/3045759888] ex_rep_mgr: rep_apply: Decrement apply_th 0 [1][26780]
[1271072497:348707][5079/3045759888] ex_rep_mgr: DIR2 rep_process_message: msgv = 5 logv 17 gen = 1 eid 0, type log, LSN [1][26780]
[1271072497:348730][5079/3045759888] ex_rep_mgr: rep_apply: Set apply_th 1
[1271072497:348753][5079/3045759888] ex_rep_mgr: rep_apply: Decrement apply_th 0 [1][26848]
[1271072497:348774][5079/3045759888] ex_rep_mgr: DIR2 rep_process_message: msgv = 5 logv 17 gen = 1 eid 0, type log, LSN [1][26848]
[1271072497:348796][5079/3045759888] ex_rep_mgr: rep_apply: Set apply_th 1
[1271072497:348819][5079/3045759888] ex_rep_mgr: rep_apply: Decrement apply_th 0 [1][27012]
[1271072497:348840][5079/3045759888] ex_rep_mgr: DIR2 rep_process_message: msgv = 5 logv 17 gen = 1 eid 0, type log, LSN [1][27012]
[1271072497:348862][5079/3045759888] ex_rep_mgr: rep_apply: Set apply_th 1
[1271072497:348885][5079/3045759888] ex_rep_mgr: rep_apply: Decrement apply_th 0 [1][27080]
[1271072497:348906][5079/3045759888] ex_rep_mgr: DIR2 rep_process_message: msgv = 5 logv 17 gen = 1 eid 0, type log, LSN [1][27080]
[1271072497:348928][5079/3045759888] ex_rep_mgr: rep_apply: Set apply_th 1
[1271072497:348951][5079/3045759888] ex_rep_mgr: rep_apply: Decrement apply_th 0 [1][27244]
[1271072497:348972][5079/3045759888] ex_rep_mgr: DIR2 rep_process_message: msgv = 5 logv 17 gen = 1 eid 0, type log, LSN [1][27244]
[1271072497:348994][5079/3045759888] ex_rep_mgr: rep_apply: Set apply_th 1
[1271072497:349016][5079/3045759888] ex_rep_mgr: rep_apply: Decrement apply_th 0 [1][27312]
[1271072497:349037][5079/3045759888] ex_rep_mgr: DIR2 rep_process_message: msgv = 5 logv 17 gen = 1 eid 0, type log, LSN [1][27312]
[1271072497:349059][5079/3045759888] ex_rep_mgr: rep_apply: Set apply_th 1
[1271072497:349082][5079/3045759888] ex_rep_mgr: rep_apply: Decrement apply_th 0 [1][27476]
[1271072497:349103][5079/3045759888] ex_rep_mgr: DIR2 rep_process_message: msgv = 5 logv 17 gen = 1 eid 0, type log, LSN [1][27476] flush perm
[1271072497:349126][5079/3045759888] ex_rep_mgr: rep_apply: Set apply_th 1
[1271072497:349392][5079/3045759888] ex_rep_mgr: rep_apply: Decrement apply_th 0 [1][27556]
[1271072497:349422][5079/3045759888] ex_rep_mgr: Returning ISPERM [1][27476], cmp = 0

How does friends and family mobile deal work ?

Hi there, just recently come back to Bt and have unlimited evening and weekend with friends and family mobile deal call plan.
Does this apply to all the mobiles I call, or do we have to register the numbers to get the discounted calls ?
Thanks in advance.
Shi

Hi shi,
Welcome to the forum.
The Friends and Family Mobile discount applies to all mobiles, you don't need to add any numbers. See here for more info on prices.
Thanks,
Stephanie
Stephanie
BTCare Community Manager
If you like a post, or want to say thanks for a helpful answer, please click on the Ratings star on the left-hand side of the post. If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’.

How does create and associate an apple id to an existing email?

Hello everybody,
Please, how can I found an apple id when I know my e-mail only ?
Thank you,

To create a new Apple ID go to http://appleid.apple.com and click 'Create an Apple ID'.
If you have created an Apple ID but forgotten it, click 'Find your Apple ID'.

How does "SoftReference" and "WeakReference" work?

Hello, everybody!
I want to design a cache with "SoftReference"
the cache is just like:
int length = 1024;
Object[] cacheObjects = new Object[length+1];
cacheObjects[value.hashCode() & length] = new SoftReference(value);I hope the "value" and soft reference are cleared by gc at some time before throwing "OutOfMemoryError" if there is no directly reference to the "value" object.
So I wrote a simple test:
private static void softCache() {
        int i = 400000;
        List<String> list = new ArrayList<String>(i + 1);
        String a = "...."; // a huge string;
        while (i-- > 0) {
            list.add(a + i);
        Reference<Object> ref = new SoftReference<Object>(110);
        try {
            long[] b = new long[20000000];
            System.out.println(b[0]);
        } catch (Exception e) {
        } finally {
            System.out.println(ref.get());
        System.out.println("OK");
    }The test result is:
the ref and the 110 object are not cleared before throw "OutOfMemoryError".
Why?

Well, for a start the result of boxing 110 is a
reference to a static Integer object - Integer has
predefined instances for numbers up to 128, I
believe. So there's a strong reference to it, and it
can't be cleared. The ref variable won't be cleared,
because it's a strong reference to a WeekReference
object.Yes, you are right. If I change 110 to 1000. it was cleared.
Thanks.
Your has table stuff is wrong (you need to use %
length not & length, and allow for synonyms, i.e.
different objects with the same hashCode), might as
well stick to HashMap. You need a seperate key anyway
to find the appropriate object in a cache.why '% length', not '& length'?
It 's allowed to cover by the object with same hashCode.
here the cache is for huge number object(may more than 10,000, 000).
It's more important to save space and improve speed if match probability > 90%. not nedd to find the appropriate object for each key.
You should also use a cleanup thread. Create a
reference queue and attach the SoftReferences to it,
then a cleanup thread deletes the entries from the
hashtable when their references are cleared. The
requires extending the SoftReference class to add the
key information needed to find and clear the hash
table entry.yes. thank your advice.

How does tRFC and JCO3 work?

Hello.
I'm building an application that based on JCo 3 and iDoc libraries 3 will be used to execute BAPIs remotely and also send iDocs.
I'm wondering if it will be a valid scenario to use the same TID in to make multiple calls and if this whole set of calls will be consider to be part of the same transaction. For example:
JCoFunction function1 = ...;
JCoFunction function2 = ...;
IDocDocument idoc1 = ...;
try {
   String tid = destination.createTID();
   function1.execute(destination, tid);
   JCoIDoc.send(idoc1, ..., destination, tid);
   function2.execute(destination, tid);
   destination.confirmTID(tid);
} catch(Exception ex) {
Is this something that makes sense? Or should createTID and confirmTID be called for each execute/send? If this is valid, what will happen if executing function2 fails? Is there any way to notify that the tid was not finished or is not valid?
Thank you very much.

Did nobody have an answer for those questions?

App Store - How does licensing and transferring work?

I've just purchased and downloaded Aperture from the Mac App Store and it appears to have installed correctly but I have no notification of a licence number, no dmg file and no information about whether I can load it on other computers that I own. Is this a one computer licence or what? and what happens if I lose the program or have a disk crash or change to another machine?

There is no license as the apps are already pre-registered for ownership via the MAS. There is no disc image. The applications are simply fully installed on your computer as if you installed from a disc image.
If you select MAS Help from its Help menu, open the section "Purchase applications" then select "Use applications on multiple Macs." The information should answer the question.

How does Webservices and EJB's differ?

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