Failover with idempotent methods

All,
I have a stateless session bean in a clustered environment whose methods are
idempotent. Assuming that a failure occurs when I invoke one of its
methods, will WebLogic automatically try to get another reference to the
bean and re-invoke the same method again? If so, how many times will it
attempt this retry? If not, does this mean I have to re-invoke the method
on the bean myself (and hence, what is the difference between this approach
and that taken for stateless session beans whose methods are NOT
idempotent)?
Thanks in advance for your replies,
-Jon

Based on the response from the server, in the sense that if the stub doesn't get
any exception it wouldn't retry. Idempotent means you are basically saying that
it doesn't change the state on the server even if you make the call twice or
more. If the method is not idempotent there might be instance where your call
might or might not have succeeded in which case the stub won't retry. Whereas
with idempotent methods it will retry. You don't have to do anything on client
side to get this behavior. Weblogic rmic provides with smart stubs that does
this for you under the covers.
Prasad
Jon Eagles wrote:
>
All,
I have a stateless session bean in a clustered environment whose methods are
idempotent. Assuming that a failure occurs when I invoke one of its
methods, will WebLogic automatically try to get another reference to the
bean and re-invoke the same method again? If so, how many times will it
attempt this retry? If not, does this mean I have to re-invoke the method
on the bean myself (and hence, what is the difference between this approach
and that taken for stateless session beans whose methods are NOT
idempotent)?
Thanks in advance for your replies,
-Jon

Similar Messages

Weblogic7/examples/clustering/ejb Automatic failover for idempotent methods ?

This one should be easy since it is from the examples folder of bea 7 about
          clustering.
          Ref : \bea7\weblogic007\samples\server\src\examples\cluster\ejb
          I am referring to the cluster example provided with the weblogic server 7.0
          on windows 2000.
          I deployed Admin server and 2 managed server as described in document.
          Everything works fine as shown by the example. I get load balancing and
          failover both. Too Good.
          Client.java is using the while loop to manage the failover. So on exception
          it will go thru the loop again.
          I understand from the documentation that the stateless session EJB will
          provide the automatic failover for Idempotent stateless bean
          Case Failover Idempotent : ( Automatic )
          If methods are written in such a way that repeated calls to the same method
          do not cause duplicate updates, the method is said to be "idempotent." For
          idempotent methods, WebLogic Server provides the
          stateless-bean-methods-are-idempotent deployment property. If you set this
          property to "true" in weblogic-ejb-jar.xml, WebLogic Server assumes that the
          method is idempotent and will provide failover services for the EJB method,
          even if a failure occurs during a method call.
          Now I made 2 changes to the code.
          1 . I added as follows to the weblogic-ejb-jar.xml of teller stateless EJB
          <stateless-clustering>
          <stateless-bean-is-clusterable>true</stateless-bean-is-clusterable>
          <stateless-bean-load-algorithm>random</stateless-bean-load-algorithm>
          <stateless-bean-methods-are-idempotent>true</stateless-bean-methods-are-idem
          potent>
          </stateless-clustering>
          So I should get the automatic failover .............
          2. Also I added the break statement in the catch on line around 230 in
          Client .java
          catch (RemoteException re) {
          System.out.println(" Error: " + re);
          // Replace teller, in case that's the problem
          teller = null;
          invoke = false;
          break;
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          Now I compile and restart all my three servers and redeploy application (
          just to be sure )
          I start my client and I get a automatic load balancing between the server
          which makes me happy.
          But Failover ....?
          I kill one of the managed application server in cluster at any particular
          test fail point.
          I expect the exception to be taken care automatically by error/failover
          handler in the home/remote stub
          But the client program fails and terminates.
          1. What is wrong with the code ?
          2. Does the automatic failover with the indempotent methods also has to be
          taken care by coding the similar while loop for stateless ejb ?
          Your help will be appreciated ASAP.
          Let me know if you need any thing more from my system. But I am sure this
          will be very easy as it is from the sample code.........
          Thanks


Sorry I meant to send this to the ejb newsgroup.
          dan
          dan benanav wrote:
          > Do any vendors provide for clustering with automatic failover of entity
          > beans? I know that WLS does not. How about Gemstone? If not is there
          > a reason why it is not possible?
          >
          > It seems to me that EJB servers should be capable of automatic failover
          > of entity beans.
          >
          > dan

Plz help!! idempotent methods stateful session beans? (failover)

          plz help!! idempotent methods stateful session beans? (failover)
          Hi there,
          Im trying to failover my shopping cart implemented using stateful ejb, the replication
          is working but the failover is not (Object not found exception....).
          By design is hard to think on an stateful ejb using idempotent methods, but after
          checking the documentation in detail im completely confused, so im starting to
          wonder if i should use idempotent methods or manual retry in case one server is
          down.
          Plz take a loo at these explanations about faiolver in the WLS edocs.
          "....With clustered objects, automatic failover generally occurs only in cases
          where the object is idempotent.....Because of this, replica-aware stubs will not,
          by default, attempt to retry a method that fails after the request is sent but
          before it returns. This behavior can be overridden by marking a service idempotent..."
          BUT
          "By default, a stateful session bean's Home stub provides load balancing and failover
          for its method invocations to any clustered server where the bean is deployed...."
          So is possible to achieve automatic failover (not only load balancing) for stateful
          ejb without having to worry about state-changes or manual retry. (i know the retry
          is requiered if the server crashed just before finishing a transaction but this
          is not what im talking about).
          Any help will be highly appreciated
          Alan


          Ryan,
          Yes, im deploying using In-memory replication and clusterable elements, when try
          to invoke the method (after one of the nodes is down) i recieve an "java.rmi.NoSuchObjectException:
          Bean has been deleted".
          I believe all this could be related to some sort of issue with JNDI Lookup in
          the cluster, but haavent been able to get a clue to make it work....(almost desesperate
          by now)
          Alan
          "ryan upton" <[email protected]> wrote:
          >Alan,
          >
          >If the state isn't maintained during failover I would suspect a
          >configuration error. Have you set the <replication-type> element within
          ><stateful-session-clustering> tag in the bean's deployment descriptor?
          >
          >"Alan" <[email protected]> wrote in message
          >news:40e17cf7$1@mktnews1...
          >>
          >> Ryan,
          >>
          >>
          >> Maybe i didnt explain myself, in the scenario im dealing with I KNOW
          >the
          >method
          >> finished succesfully (example, the user succesfully added an item to
          >a
          >cart).
          >>
          >>
          >> Just after that one of the nodes goes down, and the user decides to
          >add a
          >new
          >> item (new invocation , not a retry of failed one) on the same session.
          >>
          >> This is the case in which failover should work automatically as you
          >say,
          >meaning
          >> the new method invokation should be able to retrieve the session state
          >info from
          >> the replica and switch the primary.....Well, this is the part wich
          >isnt
          >working
          >> :( as i understand it should transparently
          >>
          >> I believe could be a config issue , but have no way to make it work.
          >>
          >> Regards,
          >>
          >> Alan
          >> "ryan upton" <[email protected]> wrote:
          >> >
          >> >"Alan" <[email protected]> wrote in message
          >news:40e06296@mktnews1...
          >> >>
          >> >> Ryan,
          >> >>
          >> >> Thanks for clearing the both conditions a bit more, in this case
          >my
          >> >issue
          >> >has
          >> >> to do with the scenario #1 in which subsequent calls (invocations)
          >> >go to a
          >> >node
          >> >> which isnt avaliable(down), do you have any idea of in what conditions
          >> >the
          >> >"automnatic"
          >> >> failover would fail??? (meaning why the stub would try to dispatch
          >> >a call
          >> >to the
          >> >> same previous node)
          >> >>
          >> >> Thanks for the help again
          >> >>
          >> >
          >> >Subsequent calls won't go to a node that's down. That's the whole
          >> >point
          >> >;-). Failover is always automatic, what you are getting confused
          >on
          >> >is
          >> >automatic method re-execution upon failover which happens if the method
          >> >has
          >> >been marked as idempotent. The logic is this: if I failover to an
          >EJB
          >> >that
          >> >I know is still alive, I can't safely call the same method again.
          > Why?
          >> >Because I don't know how much of the method completed the last time
          >before
          >> >the previous bean's failure. So if the bean can yield multiple results
          >> >from
          >> >multiple invocations I had better play it safe and not re-execute
          >the
          >> >method
          >> >on the bean I failed over to (unless it's idempotent because in that
          >> >case it
          >> >doesn't matter how many times I call it, it always does the same thing).
          >> > In
          >> >scenario #1 and #2 failover is automatic and all new calls are executed
          >> >against the bean the client failed over to, but only idempotent methods
          >> >are
          >> >re-executed.
          >> >
          >> >
          >>
          >
          >

Issue with a method call in a TaskFlow (works 2 times instead of 1)

Hi guys,
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Let me tell us the details of :
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Hi
create a temp calculated column
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Romeo Donca, Orange Romania (MCSE, MCITP, CCNA) Please Mark As Answer if my post solves your problem or Vote As Helpful if the post has been helpful for you.

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Tessalating the polygons (tax districts) is the answer!
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Index
NUM_TAX_DIST
1
6
<2
49
<3
44
<4
23
<5
11
<6
9
<7
9
<8
4
<9
1
<10
4
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14
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TROUBLE WITH PAYMENT METHOD USED DIFFRENT VISA PAYMENTS STILL WONT WORK

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This is a case for the iTunes Store Support:
1. Go to expresslane.apple.com
2. select 'itunes' and then 'itunes store' on the right
3. select a topic and a subject
4. click 'continue' and then 'email'
5. fill out the form and explain your situation
6. they will respond within 24 hours usually
Good luck
Stijn

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Marco Tranquillin

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Marco Tranquillin

Redirect page with POST method in JSTL

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how to hide the parameter, so it didn't show at the URL..??
anybody help me..??
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Original Question:
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Contact iTunes store support: https://ssl.apple.com/emea/support/itunes/contact.html.

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>
Even if i have a same "fieldValue" in the database
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private static void readTextFile(File f) {
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line = in.readLine();
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recordIn.putAreaNumber(Integer.parseInt(line.substring(0,i).trim()));
recordIn.putLocation(line.substring(i+1).trim());
records.addElement(recordIn);
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in.close();
} catch (IOException e) {
System.out.println ("Error reading file");
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for (int i = 0; i < 11; i++)
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RESULTS:
C:\Training\Java>java ConvertTextFileToObjectFile data\ssn.dat
0 null
3 New Hampshire
7 Maine
9 Vermont
34 Massachusetts
39 Rhode Island
49 Connecticut
134 New York
158 New Jersey
211 Pennsylvania
680 Nevada
680 Nevada
680 Nevada
680 Nevada
680 Nevada
680 Nevada
680 Nevada
680 Nevada
680 Nevada
680 Nevada
680 Nevada
C:\Training\Java>

First of all it would be better if you did a priming read and then checked line == null in the while statement instead of the way you have it.
ctr++ will also accomplish what ctr +=1 is doing.
you need to create a new instance of SsnLocationRecord for each line read. What you are doing is overlaying the objects data each time you execute the .putxxxx methods. The reference to the object is placed in the vector. The actual object is still being updated by the .putxxx methods (NOTE : THIS IS THE ANSWER TO YOUR MAIN QUESTION).
you close should be in a finally statement.
To process through all the elements of a Vector create an Enumeration and then use the nextElement() method instead of the elementAt is probably better. (Some will argue with me on this I am sure).
Also, on a catch do not call System.exit(0). This will end your JVM normally. Instead throw an Exception (Runtime or Error level if you want an abnormal end).

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I have a program to save each row of a A/R Invoice as one A/R Invoice document.
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            Next
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                SBO_COMPANY.EndTransaction(SAPbobsCOM.BoWfTransOpt.wf_Commit)
            End If
            BubbleEvent = False
            oForm.Mode = SAPbouiCOM.BoFormMode.fm_OK_MODE
            oForm.Mode = SAPbouiCOM.BoFormMode.fm_ADD_MODE
        Catch ex As Exception
            If SBO_COMPANY.InTransaction Then
                SBO_COMPANY.EndTransaction(SAPbobsCOM.BoWfTransOpt.wf_RollBack)
            End If
        End Try
   End Sub
   Private Sub subSetInvoiceH()
   //code to set A/R Invoice header data to SAPbobsCOM.Documents
   End Sub
   Private Sub subSetInvoiceL()
//code to set A/R Invoice line data to SAPbobsCOM.Documents_Lines
   End Sub
Can someone help me?
Thanks in advance.

Thanks for the response.
I tried GetLineData(i-1), but got error "Row - Invalid index" message.
I think the index of the datasource has no problem in my program since i set -1 when i get the data from datasource.
The following is the code when setting data to the business objects.
Private Sub subSetInvoiceH()
        Dim nCount As Integer
        Dim oDBDataSource As SAPbouiCOM.DBDataSource
        oDBDataSource = oDBDataSources.Item("OINV")
        nCount = oDBDataSource.Size - 1
        InvoiceH = SBO_COMPANY.GetBusinessObject(SAPbobsCOM.BoObjectTypes.oInvoices)
        With InvoiceH
            If oDBDataSource.GetValue("CardCode", nCount) <> "" Then
                .CardCode = oDBDataSource.GetValue("CardCode", nCount)
            Else
                .CardCode = ""
            End If
            If oDBDataSource.GetValue("DocDate", nCount) <> "" Then
                .DocDate = oDBDataSource.GetValue("DocDate", nCount).Insert(4, "/").Insert(7, "/")
            Else
                .DocDate = "0"
            End If
        End With
    End Sub
Mika

Problem with prerender method

Hi,
I have a problem with the method prerender. A month ago, I started to develop a web project using Sun Studio Creator and a few page beans that i used extended the Abstract Page Bean, so I overrided the prerender and customized it.
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The code of java bean doesn't change, the only thing that has changed is the configuration files (faces-config.xml, web.xml, etc).
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After serveral changes, I wrote this code in the method prerender :
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I'm a bit lost,
thanks

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