EJB Isolation levels in ejb-j2ee-engine.xml

Can anyone explain to me why I only seem to have the option of using the 'repeatable read' isolation level in Netweaver Developer Studio?
I'm new to SAP and Netweaver but as a seasoned J2EE developer I would have expected to find read committed, read uncommitted, serializable, as well as repeatable read.
Is there some SAP or Netweaver specific reason why I don't get to choose these options, or do I need to enable them by configuring properties somewhere?

Hi Steve,
The reason is that the J2EE Engine EJB Container supports Read Committed and Repeatable Read isolation levels and Read Committed is the default one. That's why you only have the option of specifying Repeatable Read.
For more information on locking and isolation levels please have a look at these documents:
http://help.sap.com/saphelp_nw04/helpdata/en/37/019b3e25f95f14e10000000a114084/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/a1/d81db94a10bc4b83b3f60b0e3037e7/frameset.htm
Best regards,
Vladimir

Similar Messages

No ejb-j2ee-engine.xml after new EJB module project

Hi! Can someone please help. Newbie here
I installed SDK 1.4.2_13
I installed Netweaver Developer Studio 7.0.09
When I create a new ejb module project I only see the files
ejb-jar.xml
ejbmodule
I miss the file ejb-j2ee-engine.xml
How is this possible?

I solved the problem by uninstalling SAP Netweaver Developer Studio version 7.0.09 and install version 7.0.08
However, It's still strange why there was no ejb-j2ee-engine.xml when there was created a new EJB project module.

Cannot parse ejb-j2ee-engine.xml

During installation of XI3.0 I get this error in the "Online deployment adapter framwork". Has anyone else seen this error? Here's the complete error:
Error: Aborted: development component 'com.sap.xi.mdt'/'sap.com'/'SAP AG'/'3.0.20040129102613.0000':
Caught exception during application deployment from SAP J2EE Engine's deploy service:
java.rmi.RemoteException: Cannot deploy application sap.com/com.sap.xi.mdt..
Reason: Cannot parse ejb-j2ee-engine.xml.; nested exception is:
com.sap.engine.services.ejb.exceptions.deployment.EJBXMLParserException: Cannot parse ejb-j2ee-engine.xml.
Any help will be apreciated!

Hello Dankertsen
This is a standard error in SAP XML Deployment file, you need to check the file ejb-j2ee-engine.xml if it starts with a space (first line) you must remove it and then update the file aii_mdt_bean.jar. and then retry again.
Hope this will help.
Regards,
M. Zehana

Isolation level in EJB

Hi people,
I set isolation level into ejb-j2ee-engine.xml adding entity bean methods in order to have a lock in the records table (Oracle). In the xml I have the follow for each method:
     <transaction-descriptor>
          <isolation-level>
               <method>
                    <ejb-name>DatabaseTabaccaiEjbBean</ejb-name>
                    <method-name>ejbFindByPrimaryKey</method-name>
                    <method-params>
                         <method-param>java.lang.Long</method-param>
                    </method-params>
               </method>
When I deploy the EAR containing the EJB project I have the follow error:
Caught exception during application deployment from SAP J2EE Engine's deploy service:java.rmi.RemoteException: Cannot deploy application sap.com/DatabaseTabaccaiEar.. Reason: Cannot find method ejbFindByPrimaryKey(java.lang.Long) declared in ejb-j2ee-engine.xml.; nested exception is:      com.sap.engine.services.ejb.exceptions.deployment.EJBXMLParserException: Cannot find method ejbFindByPrimaryKey(java.lang.Long) declared in ejb-j2ee-engine.xml. (message ID: com.sap.sdm.serverext.servertype.inqmy.extern.EngineApplOnlineDeployerImpl.performAction(DeploymentActionTypes).REMEXC)
Where is the problem?
Thanks,
Vito

For 5.1, look at:
          http://www.weblogic.com/docs51/classdocs/API_ejb/EJB_environment.html#107261
          7
          http://www.weblogic.com/docs51/classdocs/API_ejb/EJB_reference.html#1061916
          "marshalli" <[email protected]> wrote in message
          news:3a59546d$[email protected]..
          >
          > How to set the isolation level(Container Manager or Bean Manager) in EJB.
          Thanks
          >
          >

Transaction Isolation Level for EJB methods

L.S.
I just found out the in OC4J one can not set the transaction isolation level on ejb methods. Moreover one needs to revert to bean managed transaction (manual coding of the ALL transaction logic) to set the isolation level.
On entity beans one can only set the isolation level for the whole bean (not on individual methods), and in session beans there is no way at all to set the isolation level.
This is on shear contract to all other application servers I used before (there one can declaratively set the isolation level for a ejb method, both in session and in entitybean deployment descriptors)
Is it foreseen in a future release to include such a valuable feature will be provided by oc4j?
Note that I was VERY surprised that OC4J could not handle this (I checked the j2ee spec, but admittedly the spec is a little vague about this support and makes it vendor dependent. the j2ee spec does not mandate this, except for CMP entity beans, but includes some suggestions on this ability. But most other application servers implemented the ability)
Regadrs,
Erik

Hello Erik --
I think we met in Perth recently?
Anyway, your information is correct.
We can set the transaction isolation level for each entity bean, at the bean level. We don't have for the specification of method level isolation settings -- I'd be interested to hear how you would like/do use this. What behaviour do you expect to see when a transaction is started that spans multiple methods on a bean with different declared isolation levels.
For session beans, we do not currently have the ability to declaratively specify the isolation level to use for the bean. I know this is not in the forthcoming 904 release, and will to check what is beyond that.
As you point out, this can be done programatically using the Connection.setIsolationLevel() method on any connections you are using from within the session bean.
I'd would like to log an enhancement request for you for this functionality. Can you send me an email at [email protected] and we'll take it offline.
-steve-

Editing application-j2ee-engine.xml file in Web Dynpro DC

I'd like to set one of my web dynpro apps to automatically start whenever the J2EE engine is started.
<a href="http://help.sap.com/saphelp_erp2005/helpdata/en/94/0a5b422f786255e10000000a155106/frameset.htm">This SAP Library document</a> states that you can do that in the application-j2ee-engine.xml file. However, I cannot find the application-j2ee-engine.xml file anywhere in my Web Dynpro DC. I've opened the DC in Web Dynpro Explorer view, Package Explorer view, Navigator view, J2EE DC Explorer view and J2EE Explorer view.
Even after expanding all the folders in each view I still can't find the application-j2ee-engine.xml file.However if I search my '.dtc' folder on my hard drive I find the application-j2ee-engine.xml file in the following path:
C:\...\.dtc\1\t\13AA2EFA530FEB42915442D10D7C71A6\gen_wdp
How can I EDIT that file for a web dynpro component/app?
Thanks!
David
Message was edited by: David Z. Pantich to include the link to the SAP Library document

Hi Maksim. I understood that. It's just that I would prefer some method that doesn't require the developers to do something like extracting a file from the EAR file, changing the file and then putting it back in. As you probably know, some developers could handle it and some will most certainly make mistakes.
When they do they come to my group and say "my app doesn't work" and then we have to spend time figuring out why.
Plus, once the developers get used to doing things the automated way they're going to have a hard time remembering to do a manual step each time they do a build.
I have heard that there may be some way to do something similar to this on Visual Administrator. I'm going to investigate that too.
Thanks!
David.

Where to change application-j2ee-engine.xml ??

hi,
i have to change the application-j2ee-engine.xml file.
WHERE is this file stored ?
b. reg, Martin

hi,
okay, thank you
so far, so good. i have never used eclipse before !
when i open J2EE development the J2EE Explorer view is EMPTY.
how should eclipse (which is on my client) know from where it should get the files ????
where is the connection to sap ?
very confusing
best reg. Martin

ISA 5.0 / NWDI : web-j2ee-engine.xml / synchronization question

Hello experts
I wonder whether this is normal that whenever I start a synchronization on the crm/isa/web/b2c DC (or in my custom DC which synchronizes the used DCs including crm/isa/web/b2c), nwds asks me to create an activity to take into account changes on the web-j2ee-engine.xml file ?
I select cancel each time but maybe I'm wrong ?
Is there a solution that nwds not ask me more ? Is there a mistake in any configuration file ?
Thank you very much and have a nice day
Julien

hi
sap friends
i have configured B2B in CRM 5.0 sr2 (ABAP+JAVA) on same host VIA XCM
while login into this link
http://idescrmsr2.iserviceglobe.com:50000/b2b/b2b/init.do
http://idescrmsr2.iserviceglobe.com:50000/isauseradm/useradmin/init.do
with user test , this user is having the following roles
SAP_ALL
sap-new
sap_j2ee_admin
sap_crm_eco_isa*
sap_crm*
sap_crm_isa*
all the b2b related roles i have given, but still am unable to login into above URLs
it is giving error message like :"<b>LOGON IS INVALID,CHECK UR ENTRIES</b>"
is there any configuration related users configuratiom
plz help me anbody regarding this problem

Set isolation level in EJB 2.0

how can i set isolation level to a transaction in EJB 2.0.
If anybody can give example code much appriciated

For 5.1, look at:
          http://www.weblogic.com/docs51/classdocs/API_ejb/EJB_environment.html#107261
          7
          http://www.weblogic.com/docs51/classdocs/API_ejb/EJB_reference.html#1061916
          "marshalli" <[email protected]> wrote in message
          news:3a59546d$[email protected]..
          >
          > How to set the isolation level(Container Manager or Bean Manager) in EJB.
          Thanks
          >
          >

How to set isolation level in EJB?

          How to set the isolation level(Container Manager or Bean Manager) in EJB. Thanks


For 5.1, look at:
          http://www.weblogic.com/docs51/classdocs/API_ejb/EJB_environment.html#107261
          7
          http://www.weblogic.com/docs51/classdocs/API_ejb/EJB_reference.html#1061916
          "marshalli" <[email protected]> wrote in message
          news:3a59546d$[email protected]..
          >
          > How to set the isolation level(Container Manager or Bean Manager) in EJB.
          Thanks
          >
          >

Regarding application-j2ee-engine.xml ?

Hi @,
Where can i find complete description for the application j2ee engine file used during module develpmnt as the entries there make the whole module work.
I couldn't find proper details for the same file and how to correlate the same with the developed code
REgards

You need at least following references:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE application-j2ee-engine SYSTEM "application-j2ee-engine.dtd">
<application-j2ee-engine>
     <reference
          reference-type="hard">
          <reference-target
               provider-name="sap.com"
               target-type="library">com.sap.aii.af.lib</reference-target>
     </reference>
     <reference
          reference-type="hard">
          <reference-target
               provider-name="sap.com"
               target-type="service">com.sap.aii.adapter.xi.svc</reference-target>
     </reference>
     <reference
          reference-type="hard">
          <reference-target
               provider-name="sap.com"
               target-type="service">com.sap.aii.af.svc</reference-target>
     </reference>
     <reference
          reference-type="hard">
          <reference-target
               provider-name="sap.com"
               target-type="service">com.sap.aii.af.cpa.svc</reference-target>
     </reference>
     <fail-over-enable
          mode="disable"/>
</application-j2ee-engine>
If you refer to other libraries in your code as well, add the references also.
Regards
Stefan

Define multiple cookie paths in web-j2ee-engine.xml

Hello,
Is it possible to define more than one path JSESSIONID cookie is sent to? Something like
<web-j2ee-engine>
<cookie-config>
<cookie>
<type>SESSION</type>
<path>/irj;/login</path>
<domain>siemens.de</domain>
</cookie>
</cookie-config>
</web-j2ee-engine>
I want the cookie to be sent to /irj and /login, but not to /b2b.
Another solution could possibly be to change the name of the JSESSIONID cookie. Is that possible?
Thanks for you help,
Elmar

Hi Rüdiger,
I'm not really sure but this could work:
Regards,
Pascal

Error defining transaction-isolation at weblogic-ejb-jar.xml

Hi,
.. from WebLogic 5.1 reference:
(...) the top level elements in weblogic-ejb-jar.xml are as follows:
. description
. weblogic-version
. weblogic-enterprise-bean
. ejb-name
. caching-descriptor
. presistence-descriptor
. clustering-descriptor
. transaction-descriptor
. reference-descriptor
. enable-call-by-reference
. jndi-name
. TRANSACTION-ISOLATION
. security-role-assignment
this way i've appended a transaction isolation section immediatly after the jndi-name section
from my weblogic-ejb-jar.xml file to specify that all methods of my container-managed ejb
should use read-committed accesses to the database. But i've gotten the error message:
org.xml.sax.SAXParseException: Element "weblogic-enterprise-bean" allows no further input; "transaction-isolation" is not allowed.
during compilation time at parsing. Nowhere else in the weblogic-ejb-jar.xml i can put the
isolation transaction section without receiving some related parsing error. The same happens
trying to include such transaction section at ejb-jar.xml. I'm attaching both xml files. Should
anybody help me saying where that section should be described? And if it should be placed in
another file, why the documentation states for describing it at the weblogic-ejb-jar.xml?
[weblogic-ejb-jar.xml]

That means that you do not have the SP6 in the service pack and it is using
the old DTD.
Peace,
Cameron Purdy
Tangosol, Inc.
http://www.tangosol.com
+1.617.623.5782
WebLogic Consulting Available
"Ana Benites" <[email protected]> wrote in message
news:[email protected]...
>
Cameron,
hello.
When you say "<enterprise-bean>" block, you mean"<weblogic-enterprise-bean>"block, isn't it?
>
Because you recommend in your response exactly what i was doing in myweblogic-ejb-jar.xml,
>
that i had attached to my message when openning this discussion. I copyit again here:
>
My weblogic-ejb-jar.xml:
<?xml version="1.0"?>
<!DOCTYPE weblogic-ejb-jar PUBLIC '-//BEA Systems, Inc.//DTD WebLogic5.1.0 EJB//EN' 'http://www.bea.com/servers/wls510/dtd/weblogic-ejb-jar.dtd'>
>
>
<weblogic-ejb-jar>
<weblogic-enterprise-bean>
<ejb-name>cluster.ejb.TellerHome</ejb-name>
<caching-descriptor>
</caching-descriptor>
<enable-call-by-reference>False</enable-call-by-reference>
<jndi-name>cluster.ejb.TellerHome</jndi-name>
<transaction-isolation>
<isolation-level>TRANSACTION_READ_COMMITTED</isolation-level>
>
<method>
<ejb-name>cluster.ejb.TellerHome</ejb-name>
<method-name>*</method-name>
</method>
</transaction-isolation>
</weblogic-enterprise-bean>
</weblogic-ejb-jar>
...and this is resulting in the following parsing error during compiletime:
>
>
org.xml.sax.SAXParseException: Element "weblogic-enterprise-bean" allowsno further input; "transaction-isolation" is not allowed.
at com.sun.xml.parser.Parser.error(Parser.java:2775)
atcom.sun.xml.parser.ValidatingParser$ChildrenValidator.consume(ValidatingPars
er.java:306)
at com.sun.xml.parser.Parser.maybeElement(Parser.java:1280)
at com.sun.xml.parser.Parser.content(Parser.java:1498)
at com.sun.xml.parser.Parser.maybeElement(Parser.java:1399)
at com.sun.xml.parser.Parser.content(Parser.java:1498)
at com.sun.xml.parser.Parser.maybeElement(Parser.java:1399)
at com.sun.xml.parser.Parser.parseInternal(Parser.java:491)
at com.sun.xml.parser.Parser.parse(Parser.java:283)
at weblogic.xml.dom.SunDOMParser.getDocument(SunDOMParser.java:69)
at weblogic.xml.dom.DOMParser.getDocument(DOMParser.java:102)
atweblogic.ejb.deployment.dd.DescriptorLoader.<init>(DescriptorLoader.java:157
at weblogic.ejbc.runBody(ejbc.java, Compiled Code)
at weblogic.utils.compiler.Tool.run(Tool.java:80)
at weblogic.ejbc.main(ejbc.java:353)
Am i forgetting anything?
Thanks for your help
Ana.
"Cameron Purdy" <[email protected]> wrote:
Hi Ana,
Add to weblogic-ejb-jar.xml:
Inside each <enterprise-bean> block, add the following immediately before
the block closes:
<transaction-isolation>
<isolation-level>TRANSACTION_READ_COMMITTED</isolation-level>
<method>
<ejb-name></ejb-name>
<method-name>*</method-name>
</method>
</transaction-isolation>
The <ejb-name> value of the <method> block of the <transaction-isolation>
block must match the <ejb-name> value of the <enterprise-bean> block.
Please note the case sensitive nature of the values.
Peace,
Cameron Purdy
Tangosol, Inc.
http://www.tangosol.com
+1.617.623.5782
WebLogic Consulting Available
"Ana Benites" <[email protected]> wrote in message
news:[email protected]...
Thanks for your attention Cameron,
from my WebLogic Console one can read
"WebLogic Build 5.1.0 Service Pack 6 09/20/2000 21:03:19#84511"
...because i was suspecting the problem was due to a lack of
applying
the service pack 6. But even
after that upgrade the parsing errors remain.
regards
Ana
"Cameron Purdy" <[email protected]> wrote:
Ana,
The 5.1 release did NOT support transaction isolation in the
weblogic-ejb-jar.xml file.
That feature was introduced in a service pack. What SP are you using?
Peace,
Cameron Purdy
Tangosol, Inc.
http://www.tangosol.com
+1.617.623.5782
WebLogic Consulting Available
"Ana Benites" <[email protected]> wrote in message
news:[email protected]...
Hi,
.. from WebLogic 5.1 reference:
(...) the top level elements in weblogic-ejb-jar.xml are as follows:
description
weblogic-version
weblogic-enterprise-bean
. ejb-name
. caching-descriptor
. presistence-descriptor
. clustering-descriptor
. transaction-descriptor
. reference-descriptor
. enable-call-by-reference
. jndi-name
. TRANSACTION-ISOLATION
security-role-assignment
this way i've appended a transaction isolation section immediatly
after
the jndi-name section
from my weblogic-ejb-jar.xml file to specify that all methods of mycontainer-managed ejb
should use read-committed accesses to the database. But i've gotten
the
error message:
org.xml.sax.SAXParseException: Element "weblogic-enterprise-bean"
allows
no further input; "transaction-isolation" is not allowed.
during compilation time at parsing. Nowhere else in theweblogic-ejb-jar.xml i can put the
isolation transaction section without receiving some related parsingerror. The same happens
trying to include such transaction section at ejb-jar.xml. I'm
attaching
both xml files. Should
anybody help me saying where that section should be described? And
if
it
should be placed in
another file, why the documentation states for describing it at theweblogic-ejb-jar.xml?

J2EE Engine - Restart necessary after changing web.xml?

Hi people,
do I have to restart the whole J2EE Engine after changing the <max-sessions> parameter of my J2EE-App? Or is a restart of the app via the deploy service also sufficient?
This parameter change is done in web.xml on 620 and web-j2ee-engine.xml in 640.
Thanks!
Bjoern
Message was edited by: Bjoern Altmannsberger

restart only the application via deploy service
regards,
Violeta

Setting transaction isolation level in Weblogic 5.1

          Hi,
          I'm using Weblogic server5.1 and i'm trying to set the isolation level on one
          of my session bean. Below is the code :
          <weblogic-ejb-jar>
          <weblogic-enterprise-bean>
          <ejb-name>chargeMgr</ejb-name>
          <jndi-name>chargeMgr</jndi-name>
          <transaction-isolation>
          <isolation-level>Serializable</isolation-level>
          <method>
          <ejb-name>chargeMgr</ejb-name>
          <method-intf>Remote</method-intf>
          <method-name>*</method-name>
          </method>
          </transaction-isolation>
          </weblogic-enterprise-bean>
          </weblogic-ejb-jar>
          I have checked the syntax against the weblogic documentation.
          However, when i try to jar the beans up into the jar file (weblogic.ejbc), it
          give me the following error :
          org.xml.sax.SAXParseException: Element "weblogic-enterprise-bean" allows no further
          input; "transaction-isolation" is not allowed.
          Can anyone help?
          Regards.


yes, only in weblogic-ejb-jar.xml , and you can see that from the DTD
          source.
          thanks
          Yu
          "cw lee" <[email protected]> wrote in message
          news:[email protected]...
          >
          > thanks for ur advice.
          >
          > one thing i forgot to mention is that the isolation-level was specified in
          weblogic-ejb-jar.xml.
          > Do u mean that it must be placed in weblogic-cmp-rdbms-jar.xml and not
          weblogic-ejb-jar.xml
          > ?
          >
          > Are the codes u suggested to be in weblogic-ejb-jar.xml or
          weblogic-cmp-rdbms-jar.xml
          > ?
          >
          > Regards.
          >
          >
          >
          > "Yu Tian" <[email protected]> wrote:
          > >the right name for Seriealizable should be: TRANSACTION_SERIALIZABLE.
          > >so the
          > >DD looks like:
          > >
          > ><?xml version="1.0"?>
          > >
          > ><!DOCTYPE weblogic-ejb-jar PUBLIC '-//BEA Systems, Inc.//DTD WebLogic
          > >5.1.0
          > >EJB//EN' 'http://www.bea.com/servers/wls510/dtd/weblogic-ejb-jar.dtd'>
          > >
          > ><weblogic-ejb-jar>
          > > <weblogic-enterprise-bean>
          > > <ejb-name>containerManaged</ejb-name>
          > > <caching-descriptor>
          > > <max-beans-in-cache>1000</max-beans-in-cache>
          > > </caching-descriptor>
          > > <persistence-descriptor>
          > > <persistence-type>
          > > <type-identifier>WebLogic_CMP_RDBMS</type-identifier>
          > > <type-version>5.1.0</type-version>
          > > <type-storage>META-INF/weblogic-cmp-rdbms-jar.xml</type-storage>
          > > </persistence-type>
          > > <persistence-use>
          > > <type-identifier>WebLogic_CMP_RDBMS</type-identifier>
          > > <type-version>5.1.0</type-version>
          > > </persistence-use>
          > > </persistence-descriptor>
          > > <jndi-name>containerManaged.AccountHome</jndi-name>
          > > <transaction-isolation>
          > > <isolation-level>TRANSACTION_SERIALIZABLE</isolation-level>
          > > <method>
          > > <ejb-name>containerManaged</ejb-name>
          > > <method-name>*</method-name>
          > > </method>
          > > </transaction-isolation>
          > > </weblogic-enterprise-bean>
          > > </weblogic-ejb-jar>
          > >
          > >Thanks
          > >
          > >Yu
          > >
          > >
          > >"cw lee" <[email protected]> wrote in message
          > >news:[email protected]...
          > >>
          > >> Hi,
          > >>
          > >> I'm using Weblogic server5.1 and i'm trying to set the isolation level
          > >on
          > >one
          > >> of my session bean. Below is the code :
          > >>
          > >> <weblogic-ejb-jar>
          > >> <weblogic-enterprise-bean>
          > >> <ejb-name>chargeMgr</ejb-name>
          > >> <jndi-name>chargeMgr</jndi-name>
          > >> <transaction-isolation>
          > >> <isolation-level>Serializable</isolation-level>
          > >> <method>
          > >> <ejb-name>chargeMgr</ejb-name>
          > >> <method-intf>Remote</method-intf>
          > >> <method-name>*</method-name>
          > >> </method>
          > >> </transaction-isolation>
          > >> </weblogic-enterprise-bean>
          > >> </weblogic-ejb-jar>
          > >>
          > >> I have checked the syntax against the weblogic documentation.
          > >> However, when i try to jar the beans up into the jar file
          (weblogic.ejbc),
          > >it
          > >> give me the following error :
          > >>
          > >> org.xml.sax.SAXParseException: Element "weblogic-enterprise-bean"
          allows
          > >no further
          > >> input; "transaction-isolation" is not allowed.
          > >>
          > >> Can anyone help?
          > >>
          > >> Regards.
          > >>
          > >
          > >
          >

EJB Isolation levels in ejb-j2ee-engine.xml

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