Problem with Read-Only Entity Bean

Hi All,
I have an Read-Only BMP that just read data from 20 tables and stores them in a Collection. In a 'Read-Only' Entity bean, the ejbLoad() is supposed to called periodically as defined by 'read-timeout-seconds' parameter in 'weblogic-ejb-jar.xml'. But this doesn't happen. Every time I invoke the EJB, ejbCreate() and ejbLoad() get called. Any suggestions will be highly appreciated.
Here is the content of my 'weblogic-ejb-jar.xml' file.
<?xml version="1.0"?>
<!DOCTYPE weblogic-ejb-jar PUBLIC
'-//BEA Systems, Inc.//DTD WebLogic 6.0.0 EJB//EN'
'http://www.bea.com/servers/wls600/dtd/weblogic-ejb-jar.dtd'>
<weblogic-ejb-jar>
<weblogic-enterprise-bean>
<ejb-name>beanManaged</ejb-name>
     <entity-descriptor>
          <entity-cache>
               <max-beans-in-cache>1</max-beans-in-cache>
               <read-timeout-seconds>5</read-timeout-seconds>
               <concurrency-strategy>ReadOnly</concurrency-strategy>
          </entity-cache>
     </entity-descriptor>
<jndi-name>beanManaged</jndi-name>
</weblogic-enterprise-bean>
</weblogic-ejb-jar>
Thanks,
Prem

Yes, it calls ejbLoad() at intervals defined by read-timeout-seconds, but only when bean
is requested by the client, and the cached copy is old. If bean just sits in the cache
unused no ejbLoad()'s will be called.
Prem Raghupathy <[email protected]> wrote:
The weblogic document on 'Setting Entity EJBs to Read-Only' says "WebLogic Server
never calls ejbStore() for a read-only entity EJB. ejbLoad() is called initially
when the EJB is created; afterwards, WebLogic Server calls ejbLoad() only at intervals
defined by the read-timeout-seconds deployment parameter.". Here is the link to
the document
http://edocs.bea.com/wls/docs61/ejb/EJB_environment.html#1074846
Dimitri Rakitine <[email protected]> wrote:
WebLogic doesn't reload Read-Only entity beans periodically. It loads
bean instance only when client requests it, and instance is not in the
cache, or cached instance is older than read-timeout-seconds.
Prem Raghupathy <[email protected]> wrote:
This is a multi-part message in MIME format.
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Rajesh,
Thanks for your reply. I’m using WL6.1 sp1. When I log the methodcalls,
this is what I see on the server console.
SetEntityContext()
ejbCreate()
ejbPostCreate()
ejbLoad()
As you see, the ejbLoad() doesn’t get called every 5 sec, eventhough I
set the ‘read-timeout-seconds=5’ in the weblogic-ejb-jar.xml,
Do you have a working example for Read-Only BMP on WL6.1? The examplesdirectory
in weblogic 6.1 doesn’t have one.
Also find attached all the files. Any suggestions will be highly appreciated.
Thanks,
Prem.
Rajesh Mirchandani <[email protected]> wrote:
What version of the Server and Service pack are you using? Turn on
JDBC
logging and see if every ejbLoad() hits the DB.
prem wrote:
Hi All,
I have an Read-Only BMP that just read data from 20 tables and storesthem in a Collection. In a 'Read-Only' Entity bean, the ejbLoad() is
supposed to called periodically as defined by 'read-timeout-seconds'
parameter in 'weblogic-ejb-jar.xml'. But this doesn't happen. Every
time I invoke the EJB, ejbCreate() and ejbLoad() get called. Any suggestions
will be highly appreciated.
Here is the content of my 'weblogic-ejb-jar.xml' file.
<?xml version="1.0"?>
<!DOCTYPE weblogic-ejb-jar PUBLIC
'-//BEA Systems, Inc.//DTD WebLogic 6.0.0 EJB//EN'
'http://www.bea.com/servers/wls600/dtd/weblogic-ejb-jar.dtd'>
<weblogic-ejb-jar>
<weblogic-enterprise-bean>
<ejb-name>beanManaged</ejb-name>
<entity-descriptor>
<entity-cache>
<max-beans-in-cache>1</max-beans-in-cache>
<read-timeout-seconds>5</read-timeout-seconds>
<concurrency-strategy>ReadOnly</concurrency-strategy>
</entity-cache>
</entity-descriptor>
<jndi-name>beanManaged</jndi-name>
</weblogic-enterprise-bean>
</weblogic-ejb-jar>
Thanks,
Prem--
Rajesh Mirchandani
Developer Relations Engineer
BEA Support
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---=_newsgroups3c21148f----
Dimitri
Dimitri

Similar Messages

Load balancing not happending but fail over is for Read only Entity beans

          The following are the configuration.
          Two NT servers with WL5.1 sp9 having only EJBs(Read only entity beans)
          One Client with WL5.1 sp9 having servlet/java application as
          EJB client.
          I am trying to make a call like findbyprimarykey in one of the
          entity bean. I could see the request is being directed only to the one of the
          server always. When I bring that server, fail over is happening to the other server.
          Here are the settings I have in the ejb-jar.xml :
                    <entity>
                         <ejb-name>device.StartHome</ejb-name>
                         <home>com.wl.api.device.StartHome</home>
                         <remote>com.wl.api.device.StartRemote</remote>
                         <ejb-class>com.wl.server.device.StartImpl</ejb-class>
                         <persistence-type>Bean</persistence-type>
                         <prim-key-class>java.lang.Long</prim-key-class>
                         <reentrant>False</reentrant>
                         <resource-ref>
                              <res-ref-name>jdbc/wlPool</res-ref-name>
                              <res-type>javax.sql.DataSource</res-type>
                              <res-auth>Container</res-auth>
                         </resource-ref>
                    </entity>
          Here are the settings I have in the weblogic-ejb-jar.xml.
          <weblogic-enterprise-bean>
                    <ejb-name>device.StartHome</ejb-name>
                    <caching-descriptor>
                         <max-beans-in-cache>50</max-beans-in-cache>
                         <cache-strategy>Read-Only</cache-strategy>
                         <read-timeout-seconds>900</read-timeout-seconds>
                    </caching-descriptor>
                    <reference-descriptor>
                         <resource-description>
                              <res-ref-name>jdbc/wlPool</res-ref-name>
                              <jndi-name>weblogic.jdbc.pool.wlPool</jndi-name>
                         </resource-description>
                    </reference-descriptor>
                    <enable-call-by-reference>False</enable-call-by-reference>
                    <jndi-name>device.StartHome</jndi-name>
               </weblogic-enterprise-bean>
          Am I doin any mistake in this?
          Any one's help is appreciated.
          Thanks
          Suresh


we are using 5.1
          "Gene Chuang" <[email protected]> wrote in message
          news:[email protected]...
          > Colocation optimization occurs if your client resides in the same
          container (and also in the same
          > EAR for 6.0) as your ejbs.
          >
          > Gene
          >
          > "Suresh" <[email protected]> wrote in message
          news:[email protected]...
          > > Ok....the ejb-call-by-reference set to true is making the call to one
          server
          > > only. i am not sure why it is. I removed the property name and it
          works.
          > > Also I have one question, in our prduct environment, when i cache the
          ejb
          > > home it is not doing the load balancing. can any one help me for that.
          > > thanks
          > >
          > > Mike,
          > > From the sample pgm I sent, even from single client calls get load
          > > balanced.
          > >
          > > Suresh
          > >
          > >
          > > "Gene Chuang" <[email protected]> wrote in message
          > > news:[email protected]...
          > > > In WL, LoadBalancing will ONLY WORK if you reuse your EJBHome! Take
          your
          > > StartEndPointHome lookup
          > > > out of your for loop and see if this fixes your problem.
          > > >
          > > > I've seen this discussion in ejb-interest, and some other vendor
          (Borland,
          > > I believe it is), brings
          > > > up an interesting point: Clustering and LoadBalance is not in the
          J2EE
          > > specs, hence implementation
          > > > is totally up to the vendor. Weblogic loadbalances from the remote
          > > interfaces (EJBObject, EJBHome,
          > > > etc..), while Borland loadbalances from JNDI Context lookup.
          > > >
          > > > Let me suggest a third implmentation: loadbalance from BOTH Context
          > > lookup as well as stub method
          > > > invocation! Or create a smart replica-aware list manager which
          persists
          > > on the client thread
          > > > (ThreadLocal) and is aware of lookup/evocation history. Hence if I do
          the
          > > following in a client
          > > > hitting a 3 node cluster, I'll still get perfect round-robining
          regardless
          > > of what I do on the
          > > > client side:
          > > >
          > > > InitialContext ctxt = new InitialContext();
          > > > EJBHome myHome = ctxt.lookup(MY_BEAN);
          > > > myHome.findByPrimaryKey(pk); <== hits Node #1
          > > > myHome = ctxt.lookup(MY_BEAN);
          > > > myHome.findByPrimaryKey(pk); <== hits Node #2
          > > > myHome.findByPrimaryKey(pk); <== hits Node #3
          > > > myHome = ctxt.lookup(MY_BEAN);
          > > > myHome.findByPrimaryKey(pk); <== hits Node #1
          > > > ...
          > > >
          > > >
          > > > Gene
          > > >
          > > > "Suresh" <[email protected]> wrote in message
          > > news:[email protected]...
          > > > > Mike ,
          > > > >
          > > > > Do you have any reasons for the total number of machines to be 10.
          > > > >
          > > > > I tried with 7 machines.
          > > > >
          > > > >
          > > > > Here is my sample client java application running individual in the
          > > seven
          > > > > machines.
          > > > >
          > > > > StartEndPointHome =
          > > > > (StartEndPointHome)ctx.lookup("dev.StartEndPointHome");
          > > > > for(;;)
          > > > > {
          > > > > // logMsg(" --in loop "+currentTime);
          > > > > if (currentTime > nextRefereshTime)
          > > > > {
          > > > > logMsg("****- going to call");
          > > > > currentTime=getSystemTime();
          > > > > nextRefereshTime=currentTime+timeInterval;
          > > > > StartEndPointHome =
          > > > > (StartEndPointHome)ctx.lookup("dev.StartEndPointHome");
          > > > > long rndno=(long)(Math.random()*10)+range;
          > > > > logMsg(" going to call remotestub"+rndno);
          > > > > retVal =
          > > > >
          > >
          ((StartEndPointHome)getStartHome()).findByNumber("pe"+rndno+"_mportal_dsk36.
          > > > > mportal.com");
          > > > >
          > > > > logMsg("**++- called stub");
          > > > > }
          > > > >
          > > > >
          > > > >
          > > > > The range value is different for each of the machines in the
          cluster.
          > > > >
          > > > > If the first request starts at srv1, all request starts hitting the
          same
          > > > > server.
          > > > > If the first request starts at srv2, all request starts hitting the
          same
          > > > > server.
          > > > >
          > > > > I have the following for the url , user and pwd values for the
          context
          > > .
          > > > >
          > > > > public static String url="t3://10.11.12.14,10.11.12.117:8000";
          > > > > public static String user="guest";
          > > > > public static String password="guest";
          > > > >
          > > > >
          > > > >
          > > > > It would be great if you could help me.
          > > > >
          > > > > Thanks
          > > > > suresh
          > > > >
          > > > >
          > > > > "Mike Reiche" <[email protected]> wrote in message
          > > > > news:[email protected]...
          > > > > >
          > > > > > If you have only one client don't be surprised if you only hit one
          > > server.
          > > > > Try
          > > > > > running ten different clients and see if the hit the same server.
          > > > > >
          > > > > > Mike
          > > > > >
          > > > > >
          > > > > > "suresh" <[email protected]> wrote:
          > > > > > >
          > > > > > >The following are the configuration.
          > > > > > >
          > > > > > > Two NT servers with WL5.1 sp9 having only EJBs(Read only entity
          > > beans)
          > > > > > >
          > > > > > > One Client with WL5.1 sp9 having servlet/java application as
          > > > > > > EJB client.
          > > > > > >
          > > > > > >
          > > > > > >I am trying to make a call like findbyprimarykey in one of the
          > > > > > >entity bean. I could see the request is being directed only to
          the
          > > one
          > > > > > >of the
          > > > > > >server always. When I bring that server, fail over is happening
          to
          > > the
          > > > > > >other server.
          > > > > > >
          > > > > > >
          > > > > > >Here are the settings I have in the ejb-jar.xml :
          > > > > > > <entity>
          > > > > > > <ejb-name>device.StartHome</ejb-name>
          > > > > > > <home>com.wl.api.device.StartHome</home>
          > > > > > > <remote>com.wl.api.device.StartRemote</remote>
          > > > > > > <ejb-class>com.wl.server.device.StartImpl</ejb-class>
          > > > > > > <persistence-type>Bean</persistence-type>
          > > > > > > <prim-key-class>java.lang.Long</prim-key-class>
          > > > > > > <reentrant>False</reentrant>
          > > > > > > <resource-ref>
          > > > > > > <res-ref-name>jdbc/wlPool</res-ref-name>
          > > > > > > <res-type>javax.sql.DataSource</res-type>
          > > > > > > <res-auth>Container</res-auth>
          > > > > > > </resource-ref>
          > > > > > > </entity>
          > > > > > >
          > > > > > >
          > > > > > >Here are the settings I have in the weblogic-ejb-jar.xml.
          > > > > > >
          > > > > > ><weblogic-enterprise-bean>
          > > > > > > <ejb-name>device.StartHome</ejb-name>
          > > > > > >
          > > > > > > <caching-descriptor>
          > > > > > > <max-beans-in-cache>50</max-beans-in-cache>
          > > > > > > <cache-strategy>Read-Only</cache-strategy>
          > > > > > > <read-timeout-seconds>900</read-timeout-seconds>
          > > > > > > </caching-descriptor>
          > > > > > >
          > > > > > > <reference-descriptor>
          > > > > > > <resource-description>
          > > > > > > <res-ref-name>jdbc/wlPool</res-ref-name>
          > > > > > > <jndi-name>weblogic.jdbc.pool.wlPool</jndi-name>
          > > > > > > </resource-description>
          > > > > > > </reference-descriptor>
          > > > > > > <enable-call-by-reference>False</enable-call-by-reference>
          > > > > > > <jndi-name>device.StartHome</jndi-name>
          > > > > > > </weblogic-enterprise-bean>
          > > > > > >
          > > > > > >
          > > > > > >Am I doin any mistake in this?
          > > > > > >
          > > > > > >Any one's help is appreciated.
          > > > > > >Thanks
          > > > > > >Suresh
          > > > > >
          > > > >
          > > > >
          > > >
          > > >
          > >
          > >
          >
          >

Read Only entity beans and Finders

Hi,
We are using Read Only entity beans with WLS 7.0 SP1 for some entities that represent Reference Data that will never change. What I would like to know is whether WLS needs to hit the database when a finder on these beans is run or does WLS cache the results of the Finder also?
Thanks.
Santosh

Hi,
we use read only entity beans. It is beneficial if have findByPrimaryKey finders. but we also have finders on non primary key coloumn also. is there a way to cache such local references returned by such non primary key finders also.

Primary Key for Read Only Entity Beans In EJB 3.0

Hi,
I have checked the spec for ejb 3.0 which mentions that, there is no common standard for the vendor to implement the Read only Entity Beans.
My question over here is how it is implemented in OC4J??
Do we need to specify a primary key attribute in the read-only entity bean?
w.r.t BC4J(ADF) i remember, we used to create a read-only View Object with out specifying a primary key.
Just want to check is that the way it works in EJB 3.0 (Implemented by OC4J).
Thanks for your help in advance.
Shiva

Hi,
Try using the JBoss embedded container:
http://docs.codehaus.org/display/MAVENUSER/How+to+use+the+JBoss+Embedded+EJB3+Container+for+Unit+testing
/klejs

Problem with mapping the Entity beans onto database tables

Hi,
I got a problem with mapping the Entity beans onto database tables. Here are what I did:
First Step:
asant capture-schema
Second Step:
capture-schema -driver com.pointbase.jdbc.jdbcUniversalDriver -dburl jdbc:pointbase:server://localhost/sun-appserv-samples -username pbPublic -password pbpublic -table APPLICANT -table APPLICANTSKILL -table CUSTOMER -table LOCATION -table job -table JOBSKILL -table SKILL -out build/agency.dbschema
The first step was fine. But, in the second step, I got the error message as follow:
using dburl:jdbc:pointbase:server://localhost/sun-appserv-samples
using username:pbPublic
using password:pbpublic
using driver:com.pointbase.jdbc.jdbcUniversalDriver
using schemaname:null
using output file:build/agency.dbschema
JDO71100: Failed to find a class. Verify that the class is available on your CLASSPATH
java.lang.ClassNotFoundException: com.pointbase.jdbc.jdbcUniversalDriver
at java.net.URLClassLoader$1.run(URLClassLoader.java:199)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:141)
at com.sun.forte4j.modules.dbmodel.jdbcimpl.ConnectionProvider.<init>(Co
nnectionProvider.java:38)
at com.sun.jdo.api.persistence.mapping.ejb.CaptureSchema.main(CaptureSch
ema.java:130)
at com.sun.jdo.spi.persistence.support.ejb.util.CaptureSchemaWrapper.mai
n(CaptureSchemaWrapper.java:29)
Thanks for your help!

You need to add the pbclient.jar or some similar name like that, in the CalssPath.

Read Only Entity Bean will not cache

I'm using the Sun Java Application Server version 8.2. I've created a read only entity bean with a 900 second refresh. This bean has a findAll() method that I've created. The table it is reading from has only 22 rows of data that doesn't change (well, maybe 2 or 3 times a year).
As stated I've set the read-only property to true and the refresh to 900 seconds. I've also set the caching settings, which I guess i don't really need to mess with from the defaults.
I do not seem to be achieving any caching at all. My check for this is very simple. I simply load a drop down in the client application with these 22 values. After the intial load I add another row in the database. The newley added row always shows up in the drop down in real time. If i'm caching correctly I shouldn't see this value until the refresh time of 900 seconds. Is there something I am missing? I'm using NetBeans 5.0 to set the values of the entity beans and such.
Thanks for the help!
ryan

Hi Ryan,
The 8.2 read-only bean implementation still executes non-findByPrimaryKey queries within the database.
If your application calls findByPrimaryKey or accesses a business method on one of the
read-only beans returned from a query, that will not result in a database access (unless a refresh
period boundary is crossed).
We have added the additional optimization of caching specific result sets of non-findByPrimaryKey
read-only bean finders in the latest development version of Glassfish (V2).
https://glassfish.dev.java.net/public/downloadsindex.html#Official_supported_builds
It will also be available in our Application Server release 9.1. There are no plans to backport this
optimization to the 8.2 codebase.
--ken

Problem with cache refresh entity bean / server node

Hello,
ive got a big problem and not found answer in sdn until now.
Ive got a job that gets data from maxdb by sapjob - jco - session bean - entity bean - database.
this job works daily. the data to work with is written directly to database from external.
on first execute it works, but second etc not. i search for answer and i guess something:
entity bean is cached (increase percormance?) with results of the select and do not know about new database entries when they are written directly to database. so second select says: there is no new data (but they are there).
i only get this new data when i restart netweaver server node, then it works, but only for one time. then result is in cache and then i have to do same procedure before it goes (restart server).
how can i get this data? is there any setting for force node to refresh cache? or any other settings to affect something like this?
we have to go live with this in august.
thx for help.
Version: NW04, SP21

thanks at first.
OSS was the next step i consider, enforcedly.
I hoped that there was a kind of timeout in visual admin or somewhere else where (for example) i can set a special time (seconds?) for refreshig the cache. Or i can set a flag for "do not cache entity beans".
Someone else any idea?
Nowadays on test system whe have made a task that starts windows every night so that netweaver also is "fresh". a kind of resolution but not the best and no resolution for the productiv system. or whe have to write a kind of batch job that only restarts server node once a day.
New Info:
I think cache was filled directly after restart.
when we restart, then data are written, and then our application wanted to read them, they are also not seen.
The data are only seen by bean when the restart takes place AFTER the data are written into db.
So we change restart time to point after data are written. so we will test if this works, on monday we will see.
Edited by: Torsten on Jul 11, 2008 11:27 AM

Re: Read Only Entity Bean

I am trying to convert an entity bean into a read only bean .
I am not sure how it works ? I read the documentation and it said that I had to
set
the following parameters
cache-strategy>Read-Write</cache-strategy>
read-timeout-seconds>100</read-timeout-seconds>
If I set the time out time to 100 seconds will the container call the ejbLoad
method
to reload the bean after every 100 seconds or only when the a request is made
on the
bean
Thanks a lot in advance for your answers.

Kevin,
"Kevin" <[email protected]> wrote in message
news:3ec25923$[email protected]..
I am trying to convert an entity bean into a read only bean .
I am not sure how it works ? I read the documentation and it said that Ihad to
set
the following parameters
cache-strategy>Read-Write</cache-strategy>
read-timeout-seconds>100</read-timeout-seconds>
If I set the time out time to 100 seconds will the container call theejbLoad
method
to reload the bean after every 100 seconds or only when the a request ismade
on the
bean
Thanks a lot in advance for your answers.read-timeout-seconds make sense only for Read-Only
cache strategy and defines cache element expiration time.
For Read-Write strategy data will be loaded from the database
in with every new transaction (if db-is-shared set to true).
Hope this helps.
Regards,
Slava Imeshev

Read only entity beans

Is there any way to mark an entity bean as read only? I'm using glassfish V2.

JPA does not define a read-only concept, but TopLink Essentials (glassfish v2 persistence) does. You can use a DescriptorCustomizer to set your TopLink Descriptor to be read-only (descriptor.setReadOnly()).
TopLink 11g, and EclipseLink (Glassfish v3) also provider a query hint for returning read-only objects at the query level ("eclipselink.return-shared").
-- James : EclipseLink

Problem with Read-only user being able to add and delete files and folders.

The setup:
Computer #1
iMac (intel) running 10.5.5
File sharing ON
Sharing folder on external USB drive called 'iTunes' (but not the drive volume itself)
Users:
- Everyone = Read Only
- Admin(me) = Read/write
- UserA = Read Only (with account PW and username identical to local login for computer below)
Computer #2
UserA's iBook G4 running 10.4.11
When I go to finder>network>iMac>connect it prompts me to login which I do and then select 'iTunes' folder which is visible and mounts successfully. I can see all files, access them all. Life seems great. Then I discover that I can also modify and delete files from the iBook, and create and delete directories.
I'm new to networking and although I've setup and managed minimal networking tasks on PCs before, this is my first foray into the Mac networking world. Please help.
What am I doing wrong? What haven't I set?
Thanks in advance.

Sorry, I should have clarified this in the first email.
When I login from the iBook, I am logging in under a read-only user (not as myself, who is admin on the iMac). The user on the iBook has only been given read-only permissions on the iMac yet is able to add and delete files.
This read-only login/PW however, is the admin account on the iBook, but that shouldn't allow this person to write on the iMac so far as I understand things...right?

Problem with Read Only Display settings

Hi Guys,
When you use the "Read only display setting" for a field (bgcolor="#FF0000") it actually makes the whole cell red. The cell is longer then the field. Is there a way to just adjust the color of the display-only field. Firefox displays the read-only fields with the grey background (good). IE displays them as a normal text field (stupid).

Sorry, found it. You set it in HTML Form Element Attributes.
Would it not be better to have an option in the "Read Only Display setting" to set the HTML Form element aswell or instead of the cell?

Help reg. read only CMP bean in the examples!!

Hi,
I have been working with examples of EJB in WLS 6.1
I used the Access database with CMP.
The basic entity beans, both CMP and BMP worked well.
However when I tried the read-only Stock Bean and write StockWriter Beans... I received the following error... I am not sure what does it say...
==============================================
Beginning readMostly.Client...
Creating a StockWriter for BEAS
There was an exception while creating and using the Beans.
This indicates that there was a problem communicating with the server: java.rmi.RemoteException: EJB Exception:; nested exception is:
java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver]Optional feature not implemented
Start server side stack trace:
java.rmi.RemoteException: EJB Exception:; nested exception is:
java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver]Optional feature not implemented
java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver]Optional feature not implemented
at sun.jdbc.odbc.JdbcOdbc.createSQLException(JdbcOdbc.java:6026)
at sun.jdbc.odbc.JdbcOdbc.standardError(JdbcOdbc.java:6183)
at sun.jdbc.odbc.JdbcOdbc.SQLBindInParameterFloat(JdbcOdbc.java:852)
at sun.jdbc.odbc.JdbcOdbcPreparedStatement.setLong(JdbcOdbcPreparedStatement.java:575)
at weblogic.jdbc.pool.Statement.setLong(Statement.java:369)
at weblogic.jdbc.rmi.internal.PreparedStatementImpl.setLong(PreparedStatementImpl.java:114)
at weblogic.jdbc.rmi.SerialPreparedStatement.setLong(SerialPreparedStatement.java:147)
at ejb.readMostly.StockWriterBean_u4qwd5__WebLogic_CMP_RDBMS.__WL_create(StockWriterBean_u4qwd5__WebLogic_CMP_RDBMS.java:589)
at ejb.readMostly.StockWriterBean_u4qwd5__WebLogic_CMP_RDBMS.ejbCreate(StockWriterBean_u4qwd5__WebLogic_CMP_RDBMS.java:518)
at java.lang.reflect.Method.invoke(Native Method)
at weblogic.ejb20.manager.DBManager.create(DBManager.java:519)
at weblogic.ejb20.manager.DBManager.remoteCreate(DBManager.java:489)
at weblogic.ejb20.internal.EntityEJBHome.create(EntityEJBHome.java:190)
at ejb.readMostly.StockWriterBean_u4qwd5_HomeImpl.create(StockWriterBean_u4qwd5_HomeImpl.java:78)
at ejb.readMostly.StockWriterBean_u4qwd5_HomeImpl_WLSkel.invoke(Unknown Source)
at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:305)
at weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerRef.java:93)
at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:274)
at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:22)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
End server side stack trace
; nested exception is:
java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver]Optional feature not implemented
Start server side stack trace:
java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver]Optional feature not implemented
at sun.jdbc.odbc.JdbcOdbc.createSQLException(JdbcOdbc.java:6026)
at sun.jdbc.odbc.JdbcOdbc.standardError(JdbcOdbc.java:6183)
at sun.jdbc.odbc.JdbcOdbc.SQLBindInParameterFloat(JdbcOdbc.java:852)
at sun.jdbc.odbc.JdbcOdbcPreparedStatement.setLong(JdbcOdbcPreparedStatement.java:575)
at weblogic.jdbc.pool.Statement.setLong(Statement.java:369)
at weblogic.jdbc.rmi.internal.PreparedStatementImpl.setLong(PreparedStatementImpl.java:114)
at weblogic.jdbc.rmi.SerialPreparedStatement.setLong(SerialPreparedStatement.java:147)
at ejb.readMostly.StockWriterBean_u4qwd5__WebLogic_CMP_RDBMS.__WL_create(StockWriterBean_u4qwd5__WebLogic_CMP_RDBMS.java:589)
at ejb.readMostly.StockWriterBean_u4qwd5__WebLogic_CMP_RDBMS.ejbCreate(StockWriterBean_u4qwd5__WebLogic_CMP_RDBMS.java:518)
at java.lang.reflect.Method.invoke(Native Method)
at weblogic.ejb20.manager.DBManager.create(DBManager.java:519)
at weblogic.ejb20.manager.DBManager.remoteCreate(DBManager.java:489)
at weblogic.ejb20.internal.EntityEJBHome.create(EntityEJBHome.java:190)
at ejb.readMostly.StockWriterBean_u4qwd5_HomeImpl.create(StockWriterBean_u4qwd5_HomeImpl.java:78)
at ejb.readMostly.StockWriterBean_u4qwd5_HomeImpl_WLSkel.invoke(Unknown Source)
at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:305)
at weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerRef.java:93)
at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:274)
at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:22)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
End server side stack trace
End readMostly.Client...
==========================================
please help
SP
[att1.html]

<entity-cache>
          <max-beans-in-cache>...</max-beans-in-cache>
          <read-timeout-seconds>...</read-timeout-seconds>
          <concurrency-strategy>ReadOnly</concurrency-strategy>
          </entity-cache>
          I believe this is what you are looking for and this is part of entity-descriptor.
          -- Prasad
          Aruna wrote:
          > Hi
          > I am trying to develop few entity beans which is for only reading the
          > data from the data base, As Read only entity beans are treated like stateless
          > session beans(ie lead balancing at method calls as well auto failover) in the
          > cluster. I want to know how to specify an entity bean as read only entity bean???
          > ie in deployment descriptor so that ejb container treats it as a read only entity
          > bean.
          >
          > Any help on this highly appreciated
          >
          > Thanks and Regards
          > Aruna

Session bean calling read-only entiti bean

I have a session bean that is calling a read-only entity bean. I gets the remote
reference to the bean ok but when I call a method on the entity bean it locks.
After 5 minutes the call executes but then the session bean times out. Is there
any special setting I need to do this? I set both transaction attributes to Required.
Thanks,
Tim

5.1
Seth White <[email protected]> wrote:
>
Hi.
What release are you using?
Seth
Tim wrote:
I have a session bean that is calling a read-only entity bean. I getsthe remote
reference to the bean ok but when I call a method on the entity beanit locks.
After 5 minutes the call executes but then the session bean timesout. Is there
any special setting I need to do this? I set both transaction attributesto Required.
Thanks,
Tim

Rad-only Entity beans are replicated?

Hi. I have just read the document "Failover and Replication in a cluster": http://edocs.bea.com/wls/docs81/cluster/failover.html#1008850
I have no clear if read-only entity beans are replicated?
I understand that replica-aware stub does not mean that stub objects are replicated in all the servers of the cluster. This seems to be only for statefull session beans.
Thx.

Hi,
we use read only entity beans. It is beneficial if have findByPrimaryKey finders. but we also have finders on non primary key coloumn also. is there a way to cache such local references returned by such non primary key finders also.

I am facing a problem while deploying an Entity bean in iPlanet(sp3).I have attached the exception thrown.Why has this exception occured?

[04/Dec/2001 10:54:00:2] error: EBFP-marshal_internal: internal exception caught in kcp skeleton, ex
ception = java.lang.NullPointerException
[04/Dec/2001 10:54:00:2] error: Exception Stack Trace:
java.lang.NullPointerException
at java.util.Hashtable.get(Hashtable.java:321)
at com.netscape.server.ejb.SQLPersistenceManager.<init>(Unknown Source)
at com.netscape.server.ejb.SQLPersistenceManagerFactory.newInstance(Unknown Source)
at com.netscape.server.ejb.EntityDelegateManagerImpl.getPersistenceManager(Unknown Source)
at com.netscape.server.ejb.EntityDelegateManagerImpl.doPersistentFind(Unknown Source)
at com.netscape.server.ejb.EntityDelegateManagerImpl.find(Unknown Source)
at com.kivasoft.eb.EBHomeBase.findSingleByParms(Unknown Source)
at samples.test.ejb.Entity.ejb_home_samples_test_ejb_Entity_TestEntityBean.findByPrimaryKey(
ejb_home_samples_test_ejb_Entity_TestEntityBean.java:126)
at samples.test.ejb.Entity.ejb_kcp_skel_TestEntityHome.findByPrimaryKey__samples_test_ejb_En
tity_TestEntity__int(ejb_kcp_skel_TestEntityHome.java:266)
at com.kivasoft.ebfp.FPRequest.invokenative(Native Method)
at com.kivasoft.ebfp.FPRequest.invoke(Unknown Source)
at samples.test.ejb.Entity.ejb_kcp_stub_TestEntityHome.findByPrimaryKey(ejb_kcp_stub_TestEnt
ityHome.java:338)
at samples.test.ejb.Entity.ejb_stub_TestEntityHome.findByPrimaryKey(ejb_stub_TestEntityHome.
java:85)
at samples.test.ejb.TestEJB.getGreeting(TestEJB.java:51)

Hi,
I think you are trying to test the Hello world EJB example shipped with the product. As a first
step I would recomend you to go through every line of the document on deploying this application,
since, I too have experienced many errors while trying to deploy the sample applications, but on
following the documentation, I subsequently overcame all the errors and have been working with the
applications. So please follow the steps in documentation and let me know, if you still encounter any
issues.
Regards
Raj
Sandhya S wrote:
I am facing a problem while deploying an Entity bean in iPlanet(sp3).I
have attached the exception thrown.Why has this exception occured?
[04/Dec/2001 10:54:00:2] error: EBFP-marshal_internal: internal
exception caught in kcp skeleton, ex
ception = java.lang.NullPointerException
[04/Dec/2001 10:54:00:2] error: Exception Stack Trace:
java.lang.NullPointerException
at java.util.Hashtable.get(Hashtable.java:321)
at
com.netscape.server.ejb.SQLPersistenceManager.<init>(Unknown Source)
at
com.netscape.server.ejb.SQLPersistenceManagerFactory.newInstance(Unknown
Source)
at
com.netscape.server.ejb.EntityDelegateManagerImpl.getPersistenceManager(Unknown
Source)
at
com.netscape.server.ejb.EntityDelegateManagerImpl.doPersistentFind(Unknown
Source)
at
com.netscape.server.ejb.EntityDelegateManagerImpl.find(Unknown Source)
at com.kivasoft.eb.EBHomeBase.findSingleByParms(Unknown
Source)
at
samples.test.ejb.Entity.ejb_home_samples_test_ejb_Entity_TestEntityBean.findByPrimaryKey(
ejb_home_samples_test_ejb_Entity_TestEntityBean.java:126)
at
samples.test.ejb.Entity.ejb_kcp_skel_TestEntityHome.findByPrimaryKey__samples_test_ejb_En
tity_TestEntity__int(ejb_kcp_skel_TestEntityHome.java:266)
at com.kivasoft.ebfp.FPRequest.invokenative(Native Method)
at com.kivasoft.ebfp.FPRequest.invoke(Unknown Source)
at
samples.test.ejb.Entity.ejb_kcp_stub_TestEntityHome.findByPrimaryKey(ejb_kcp_stub_TestEnt
ityHome.java:338)
at
samples.test.ejb.Entity.ejb_stub_TestEntityHome.findByPrimaryKey(ejb_stub_TestEntityHome.
java:85)
at samples.test.ejb.TestEJB.getGreeting(TestEJB.java:51)
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