RE: Accessing a CMP Entity Bean

Hi There,
I have written a couple of CMP entity beans. When I run the client application, I am getting a ORB minor code 257. The error message follows. My code works with both BMP entity beans and session beans. Can anyone help? Thanks in advance.
Aug 21, 2005 10:24:57 PM com.sun.corba.ee.impl.encoding.CDRInputStream_1_0 read_value
WARNING: "IOP00810257: (MARSHAL) Could not find class"
org.omg.CORBA.MARSHAL: vmcid: SUN minor code: 257 completed: Maybe
     at com.sun.corba.ee.impl.logging.ORBUtilSystemException.couldNotFindClass(ORBUtilSystemException.java:7987)
     at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1013)
     at com.sun.corba.ee.impl.encoding.CDRInputStream.read_value(CDRInputStream.java:259)
     at com.sun.corba.ee.impl.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:1989)
     at com.sun.corba.ee.impl.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:2213)
     at com.sun.corba.ee.impl.io.IIOPInputStream.inputObject(IIOPInputStream.java:1221)
     at com.sun.corba.ee.impl.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:400)
     at com.sun.corba.ee.impl.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:330)
     at com.sun.corba.ee.impl.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:296)
     at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1034)
     at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:879)
     at com.sun.corba.ee.impl.encoding.CDRInputStream.read_value(CDRInputStream.java:255)
     at com.sun.corba.ee.spi.servicecontext.UEInfoServiceContext.<init>(UEInfoServiceContext.java:30)
     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
     at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
     at com.sun.corba.ee.spi.servicecontext.ServiceContextData.makeServiceContext(ServiceContextData.java:114)
     at com.sun.corba.ee.spi.servicecontext.ServiceContexts.unmarshal(ServiceContexts.java:195)
     at com.sun.corba.ee.spi.servicecontext.ServiceContexts.get(ServiceContexts.java:365)
     at com.sun.corba.ee.spi.servicecontext.ServiceContexts.get(ServiceContexts.java:353)
     at com.sun.corba.ee.impl.protocol.CorbaClientRequestDispatcherImpl.processResponse(CorbaClientRequestDispatcherImpl.java:470)
     at com.sun.corba.ee.impl.protocol.CorbaClientRequestDispatcherImpl.marshalingComplete(CorbaClientRequestDispatcherImpl.java:327)
     at com.sun.corba.ee.impl.protocol.CorbaClientDelegateImpl.invoke(CorbaClientDelegateImpl.java:158)
     at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.invoke(StubInvocationHandlerImpl.java:129)
     at com.sun.corba.ee.impl.presentation.rmi.bcel.BCELStubBase.invoke(Unknown Source)
     at ctaejb.entitybean.order._IOrderHome_DynamicStub.findByPrimaryKey(_IOrderHome_DynamicStub.java)
     at mainapp.CTestApplication.main(CTestApplication.java:32)
Caused by: java.lang.ClassNotFoundException
     ... 27 more
org.omg.CORBA.UNKNOWN: vmcid: 0x0 minor code: 0 completed: Maybe
     at com.sun.corba.ee.spi.servicecontext.UEInfoServiceContext.<init>(UEInfoServiceContext.java:34)
     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
     at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
     at com.sun.corba.ee.spi.servicecontext.ServiceContextData.makeServiceContext(ServiceContextData.java:114)
     at com.sun.corba.ee.spi.servicecontext.ServiceContexts.unmarshal(ServiceContexts.java:195)
     at com.sun.corba.ee.spi.servicecontext.ServiceContexts.get(ServiceContexts.java:365)
     at com.sun.corba.ee.spi.servicecontext.ServiceContexts.get(ServiceContexts.java:353)
     at com.sun.corba.ee.impl.protocol.CorbaClientRequestDispatcherImpl.processResponse(CorbaClientRequestDispatcherImpl.java:470)
     at com.sun.corba.ee.impl.protocol.CorbaClientRequestDispatcherImpl.marshalingComplete(CorbaClientRequestDispatcherImpl.java:327)
     at com.sun.corba.ee.impl.protocol.CorbaClientDelegateImpl.invoke(CorbaClientDelegateImpl.java:158)
     at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.invoke(StubInvocationHandlerImpl.java:129)
     at com.sun.corba.ee.impl.presentation.rmi.bcel.BCELStubBase.invoke(Unknown Source)
     at ctaejb.entitybean.order._IOrderHome_DynamicStub.findByPrimaryKey(_IOrderHome_DynamicStub.java)
     at mainapp.CTestApplication.main(CTestApplication.java:32)

This is probably not the best forum to get an answer. Try this one instead:
http://forum.java.sun.com/forum.jspa?forumID=13
Its difficult to know exactly the source of your problem. If your code works for session beans and Entity beans using BMP then I can only think of the following:
In a CMP Bean, the ejbLoad and ejbStore methods do nothing. The container performs the load and store for you. I don't know whether leaving code in these methods will cause any problems though.
You will need to make a few changes to your ejbCreate method though. Suppose your ejbCreate method looks like this:
public PersonKey ejbCreate(String aFirstName, String aLastName) You still need to initialise the firstName and lastName fields in the bean.
firstName = aFirstName;
lastName = aLastName;Normally, the ejbCreate method returns the key value for the created object. Using CMP, you must return null. The container generates the new key value and returns it to the client.
Not sure if that will help. Post on the link above if not.
Simon

Similar Messages

Problems accessing fields in a CMP entity bean from a session bean

Hello everybody,
I'm getting the next problem: when I try to access a field in a CMP entity bean that I have instantiated from a session bean (trhoug entitybean.getNameOfField), I get the error "the entity bean does not exist in the database".
This entity bean is accessing a table in an external database (not the DB of the WAS), but I know that it's getting the correct data from the table, since I check the entitybean.size() and the entitybean.findByPrimaryKey(), and I get the right information. For some reason, the only thing that it doesn't work in the entity bean are the getter/setter methods (I created them automatically after having created the entity fields).
I access the entity bean through its local interface...
I know it's really difficult to give an answer with so few details, but... does anybody think I forgot something important to configure??
Thank very much in advance!!
Isidro

getter and setter methods for cmp-fields are abstract.
getter and setter methods for cmr-fields are abstract.
"John Lee" <[email protected]> wrote:
>
Hi:
Which method in a CMP Entity bean should be abstract? just only SetXXX
and
GetXXX?
Thanks!
John Lee

How to use same transaction when calling CMP entity beans and DAO (JDBC)

We are currently using Weblogic 8.1 SP2 with an Oracle 10g database (using XA thin and non-XA drivers).
We have a session bean that invokes an entity bean and a DAO (data access object pattern) in order to add data in 2 separate tables (account and history). Rows are added to the first (account) table using a CMP Entity bean while inserts are done in the 2nd (history) table using a DAO. Here is some pseudo code:
addHistorySessionBean (trans-attribute="Required")
begin
Step #1 - call addAccountEntityBean (trans- attribute="Required")
Step #2 - call addHistoryDAO (get datasource, connection)
end
The 2nd table (history) has a foreign key constraint to ensure that the corresponding key exists in the first (account) table. Unfortunately, DAO inserts on the 2nd (history) table fail with a foreign key constraint violation (INTEGRITY CONSTRAINT VIOLATION - PARENT KEY NOT FOUND!) since they cannot see the row added to the 1st (account) table in step #1 by the CMP entity bean.
How does one ensure that all this is done in a single transaction ? It appears that the app server creates two seperate transactions (one for the session bean facade and the entity bean and a 2nd transaction (when we retrieve a connection using the same data source JNDI name) for the DAO.
A post on server side suggested using a "<resource-ref>" in the session bean to tie the two potentially separate transactions together, but that does not work for us. However, I am not sure if we are doing that correctly. After we define the resource ref in the session facade bean, do we use the resource ref "name" attribute to lookup the datasource or do we still lookup the datasource by JNDI name ? Do we need to define the resource-ref tag in the entity bean also ?
Does Weblogic allow using a single transaction for this type of a scenario ? How does one specify within Weblogic that the same transaction should be utilized by the entity bean and any subsequent DAOs?
People have also suggested that we defer constraint checking until the transaction(s) are committed but that sounds like a work acount without addressing this issue. Would postponing the constraint checking in Oracle cause any additional overhead ?
Any suggestions with specific examples or documentation on how to address this issue will be gratefully appreciated.

Thanks for your suggestion. Unfortunately, this does not work since it appears that there are 2 separate transactions going on here. One, the original one initiated by the session bean and used by the entity bean and the other initiated by the DAO. Any other ideas appreciated.
Hi,
Try setting the delay-database-inserts tag to
ejbCreate in RDBMS descriptor file.
http://bernal/stage/wls/docs81/ejb/DDreference-cmp-jar
.html#1113981
vasanthi ramesh

Using a CMP Entity Bean local stub as a field of another CMP Entity Bean

Hello,
Is it possible to implement a field of a CMP Entity bean as another CMP Entity bean and how is it done?
I've seen a pseudo code for this in Ed Roman's Mastering EJBs, second edition, but I can't seem to get it to work (pages: 330 - 1:1 using CMP and 339 - fake M:N using CMP).
I'm using SUN ONE Application Sever 7. Is this server capable of this?
I'm trying to implement a fake M:N relationship using 3 beans: 2 for each side of the relationship and one as the "bridge" table.
For example, the two beans on each side of the relationship are SubscriberBean, SubscriptionBean and the "bridge: bean is SubscriberSubscriptionBean. The SubscriberSubscriptionBean has two fields: SubscriberLocal stub and SubscriptionLocal stub.
Please let me know if you need more information to answer this question.
Thanks.
Nikola

Im sorry but i dont know about the example you are talking about. I kinda learn
all those techniques from forums, articles and tutorials because book often suffer from
not having the information im mostly looking for.
As far as i understand you, you want to implement a bridge been, which is representing a row in a join table. So that if one side of the relation is deleted the join-table entry (your bridge-CMP-Bean) is cascaded. Right?
First of all the simple part: (My approach)
- The joint table is foreign keys only - without a relation description. -
In this case you dont have to implement a bridge bean. Because it just wouldnt represent anything of sense.
Lets think of an entity/table USER whith the columns name (PRIMARY KEY), and prename.
Our second entity/table is ADDRESS with the columns road (PRIMARY KEY) and housenr.
The join table is simply: USER_ADDRESS with fk_name (FOREIGN KEY) and fk_road (FOREIGN KEY) both on CASCADE DELETE. So if the address is deleted the mapping entry is deleted, too same for the user part:
USER -> USER_ADDRESS <- ADDRESS.
Our entity Beans are called User and Address in class-names JNDI-names and names.
Now we want to create the CMR mapping so we can access the addresses of a user from the user bean directly. The methods on the user side are:
public abstract Collection getAddresses();
and
public abstract void setAddresses(Collection new_addresses);
the xdoclet comments on the User side are (for the getter only)
* @ejb.interface-method
* @ejb.relation
*                name = "User-has-Addresses"
*                role-name = "User-Addresses"
*                target-ejb = "Address"
*                target-multiple = "true"
* @sunone.relation
*                column="USER_ADDRESS.fk_name"
*                target="USER_ADDRESS.fk_road"
public abstract Collection getAddresses();
for the other side of the relation we define in the Address-Entity
public abstract Collection getUsers();
and
public void setUsers(Collection users);
the xdoclet comments on the Address side are (for the getter only)
* @ejb.interface-method
* @ejb.relation
*                name = "User-has-Addresses"
*                role-name = "Address-User"
*                target-ejb = "User"
*                target-multiple = "true"
* @sunone.relation
*                target="USER_ADDRESS.fk_road"
*                column="USER_ADDRESS.fk_name"
As we dont want the user or address to be deleted if the other side of the relation is deleted we dont specify cascade-delete="yes" in the ejb.relation namespace.
The sun-cmp-mappings.xml should now look like this:
(For the User - side)

<cmr-field-mapping>
<cmr-field-name>addresses</cmr-field-name>
<column-pair>
<column-name>USER_ADDRESS.fk_name</column-name>
<column-name>USER_ADDRESS.fk_road</column-name>
</column-pair>
</cmr-field-mapping>
and similar on the Address-Side:
<cmr-field-mapping>
<cmr-field-name>users</cmr-field-name>
<column-pair>
<column-name>USER_ADDRESS.fk_road</column-name>
<column-name>USER_ADDRESS.fk_name>/column-name>
</column-pair>
</cmr-field-mapping>
Dont forget that all elements in the Collection must be of the right Interface-type.
First of all the harder part:
Now what you might want is when the relation has some information specified like user live at address and is tenant or facility manager.
The, in the first step you will have to implement the UserAddressRelation entity which will have to CMR fields of the 1:N type.(Just as you wish)
Lets think of the example above extended by the relation type. Our relation bean is named UserAddressRelation.
Now User has the methods as above but the classes in the Collection must now be of the UserAddressRelationLocal/Remote interface and not AddressLocal/Remote-interface.
You will have to change the xdoclet comment to:
* @ejb.interface-method
* @ejb.relation
*                name = "User-has-Addresses"
*                role-name = "User-Address"
*                target-ejb = "UserAddressRelation"
*                target-multiple = "true"
* @sunone.relation
*                target="USER_ADDRESS.fk_name"
*                column="USER.name"
So we now dont reference the other side bean directly. We reference the relation EntityBean. Do the similar changes on the other side.
In particular you will have to specify 4 CMR mappings now:
1. User to UserAddressRelation 1:N
2. UserAddressRelation N:1
3. Address to UserAddressRelation 1:N
4. UserAddressRelation N:1
Which i dont want to explain in detail now because its kinda all the same as above.
Now you cann access the Addresses of a user in the way.
UserLocal.getAddresses(); <- !you get the mappings!
UserLocal.getAddresses().item(0).getAddress() <- you get the address (this is dirty coding just for understanding)
UserLocal.getAddresses().item(0).getUserRole() <. you get the role of the user at this address.
Hope this helped you. You are welcome to ask any detailed question.

Caching CMP Entity Beans with 9.0.2

Hi,
my CMP Entity Bean is accessed from a JSP-Page through a Stateless Session Bean. The Session-Bean executes findAll() on the Entity-Bean and the JSP-Page iterates over the Collection and displays the Fields through their getter-Methods. It turns out that every getXXX Methods results in a complete load of the Bean from the Database, so for 3 database-records with 4 attributes i get 12 SELECT - statements and 12 Activate/Load/Passivate cycles of the Entity Bean!!!!
I tried to setup the attributes in orion-ejb-jar.xml correctly, but that didn't show a difference:
-) exclusive-write-access="true" does only work in "read-only" mode (see oc4j_ejb_guide_r2.pdf)
-) setting timeouts didnt work
My Entity Bean settings are:
exclusive-write-access="true"
instance-cache-timeout="60"
max-instances="100"
max-tx-retries="0"
pool-cache-timeout="100"
The EJB-Callbacks are:
first the Session-Bean is created, and findAll() is executed - then all Entity-Beans are passivated again:
TestManBean Constructor called 1
TestManBean.setSessionContext() 1
TestManBean.ejbCreate() 1
PersonBean Constructor called 1
PersonBean.setEntityContext() 1
PersonBean.ejbActivate() 1
PersonBean.ejbLoad() 1
PersonBean Constructor called 2
PersonBean.setEntityContext() 2
PersonBean.ejbActivate() 2
PersonBean.ejbLoad() 2
PersonBean Constructor called 3
PersonBean.setEntityContext() 3
PersonBean.ejbActivate() 3
PersonBean.ejbLoad() 3
PersonBean.ejbPassivate() 1
PersonBean.ejbPassivate() 2
PersonBean.ejbPassivate() 3
now for every getXXX-Methods the following occurs:
PersonBean.ejbActivate() 3
PersonBean.ejbLoad() 3
PersonBean.ejbPassivate() 3
I user OC4J 9.0.2 Production with Oracle 8.1.6.
How can I turn on Entity-Bean Caching?
Thanks,
Gilbert

Hi Gilbert,
Someone recently asked a similar question to yours. Perhaps that thread will
be helpful to you?
Author: Valeri Kireitchik
Subject: how to set exclusive-write-access="true"
Date: May 17, 2002 10:18 PT
URL:
Re: Get the Table name by providing the Sequence name
The same person (Valeri) also asked his question on two other forums:
http://www.elephantwalker.com/rfa?id=549
http://www.mail-archive.com/orion-interest%40orionserver.com/msg19037.html
Good Luck,
Avi.

Create CMP Entity Beans from Tables Wizard - Can't see any tables with DB2

Hi,
I'm trying to use the "Create CMP Entity Beans from Tables Wizard" to create an entity from a table in a DB2 database. The problem is, on page 2, I can't see any available tables. I have verified that the connection works (I can open the connection in the Navigator frame and I can see that table).
Note that if I try this wizard on an Oracle database, I can see tables.
WTF? Can someone please help?

I second the motion. I too work in an environment with centralized data management (DBA's) that create and maintain all tables under a generic schema. This has prevented me from using the Create Entity Beans from Table feature of Jdev r3 preview.
At least I can see that I'm not alone.
Thanks
When I select the "Create CMP Entity Beans from Tables Wizard," no tables or views are available to select. The JDev database connection is using an ID assigned to me.
The tables that I am looking for were created by the DBA under his ID and are therefore in that schema. He did create Public Synonyms for them, but the tables still do not show up in the wizard.
Is there a configuration step that I need to do to have those tables show up?
Tables created by a DBA and then accessed by developers using a public synonym is a very common scenario and should be supported by JDeveloper (IMO).
Thanks.
I'm using JDev 9.0.2.8.2.

Error While Deploying A CMP Entity Bean With A Composite Primary Key

Hello all,
I have a problem deploying CMP Entity beans with composite primary keys. I have a CMP Entity Bean, which contains a composite primary key composed of two local stubs. If you know more about this please respond to my post on the EJB forum (subject: CMP Bean Local Stub as a Field of a Primary Key Class).
In the mean time, can you please tell me what following error message means and how to resolve it? From what I understand it might be a problem with Sun ONE AS 7, but I would like to make sure it's not me doing something wrong.
[05/Jan/2005:12:49:03] WARNING ( 1896):      Validation error in bean CustomerSubscription: The type of non-static field customer of the key class
test.subscription.CustomerSubscriptionCMP_1530383317_JDOState$Oid must be primitive or must implement java.io.Serializable.
     Update the type of the key class field.
     Warning: All primary key columns in primary table CustomerSubscription of the bean corresponding to the generated class test.subscription.CustomerSubscriptionCMP_1530383317_JDOState must be mapped to key fields.
     Map the following primary key columns to key fields: CustomerSubscription.CustomerEmail,CustomerSubscription.SubscriptionType. If you already have fields mapped to these columns, verify that they are key fields.Is it enough that a primary key class be serializable or all fields have to implement Serializable or be a primitive?
Please let me know if you need more information to answer my question.
Thanks.
Nikola

Hi Nikola,
There are several problems with your CMP bean.
1. Fields of a Primary Key Class must be a subset of CMP fields, so yes, they must be either a primitive or a Serializable type.
2. Sun Application Server does not support Primary Key fields of an arbitrary Serializable type (i.e. those that will be stored
as BLOB in the database), but only primitives, Java wrappers, String, and Date/Time types.
Do you try to use stubs instead of relationships or for some other reason?
If it's the former - look at the CMR fields.
If it's the latter, I suggest to store these fields as regular CMP fields and use some other value as the PK. If you prefer that
the CMP container generates the PK values, use the Unknown
PrimaryKey feature.
Regards,
-marina

How to load the existing data from the databse in the CMP entity bean?

hello
my problem is as follows--
i am creating a CMP entity bean.in these beans client create the data instances using create() function.
now a entity bean will be created for the newly created data and it's EJBObject will also be formed.
now we will be able to perform finder methods over them.
remember these data has been newly created in the database.
but now if i want to perform the finder methods on the
existing data in the database( i don't need to use create() fn as i am not "creating" the data.). how will i perform the query over the existing data.
basically i have to make a CMP bean to extract the data corresponding to a particular condition , from the database table. i don't want to create the data in the database but just find out what data satisfies my condition.
thanking you
Prashant

you have to use findByXXX methods. depending on your appserver you may have to declare them (and eventually the query you want to be used) in the vendor specific deploiement descriptor.
(e.g. using jboss i don't remember having explicitly declare the findBySomeField method - where someField is a persistent field - in the dd, whereas with bas all finder methods have to be explicitly declared)
[note that obviously these methods have to be present in your home interface]

Error while using sybase trigger with the CMP entity bean,ejb version 2.1

Hi All,
I am using ejb version 2.1 and using entity bean (Transaction required) ,i am trying to update data in sybase(ver 12.3) database table
I am using session bean(Transaction required) to update the multiple entity beans in a while loop.It is working fine .But when i am trying to run it with the trigger which updates multiple tables in different sybase databases on update of each entity.Then it throws NoSuchEntityException and it rollback the whole transaction.
My trigger has only few simple update statements and the trigger runs fine without my CMP entity bean.is the CMP does not support the update triggers in sybase or is it the problem with the transaction.
Please help
Thanks
Anshu

If you can have a look at a cmp example in the samples that ship with the server. My guess is that the weblogic-ejb-jar.xml file is missing the <persistence-use> element which for 810 would look like:
<persistence>
<persistence-use>
<type-identifier>WebLogic_CMP_RDBMS</type-identifier>
<type-version>7.0</type-version>
<type-storage>META-INF/weblogic-cmp-rdbms-jar.xml</type-storage>
</persistence-use>
</persistence>
I seem to recall that the elements might be slightly different in structure for the wls700 version of the DTD, so please check that (I cannot, I'm at home and don't have everything here).
Give that a try and see if it doesn't solve your compilation failure.
Also, the compilation should not be throwing a null pointer exception in a case like that, I consider that to be a bug.
-thorick

Error Deploying CMP Entity Bean

Hi,
I am new to Entity Beans and am trying to deploy a CMP Entity Bean without any success.
I did search this forum for similar issues and tried those suggestions as well but that has not helped. Was wondering if someone could help me out on this.
The Entity bean has 2 fields: name and description.
The ejb-jar.xml file for this bean is:
<enterprise-beans>
<entity>
<ejb-name>Product</ejb-name>
<home>example.cmp.ProductHome</home>
<remote>example.cmp.Product</remote>
<ejb-class>example.cmp.ProductBean</ejb-class>
<persistence-type>Container</persistence-type>
<prim-key-class>java.lang.String</prim-key-class>
<reentrant>false</reentrant>
<cmp-version>2.x</cmp-version>
<abstract-schema-name>PRODUCTS</abstract-schema-name>
<cmp-field>
<field-name>name</field-name>
</cmp-field>
<cmp-field>
<field-name>description</field-name>
</cmp-field>
<primkey-field>name</primkey-field>
<query>
</query>
</entity>
</enterprise-beans>
The error that I get while deploying the bean is:
Error deploying EJB homes for: file:/C:/servers/oc4j1013/j2ee/home/applications/cmptest/cmptest.jar
java.lang.InstantiationException: Error looking up cmt-datasource at jdbc/OracleDS (name not found)
at com.evermind.server.ApplicationState.getDataSourceContainer(ApplicationState.java:384)
Error deploying file:/C:/servers/oc4j1013/j2ee/home/applications/cmptest/cmptest.jar
homes: Error looking up cmt-datasource at jdbc/OracleDS (name not found)
[java] [TopLink Severe]: 2005.04.17 10:22:20.156--ServerSession(28816172)--
Local Exception Stack:
[java] Exception [TOPLINK-7060] (TopLink (Oracle OC4J CMP) - 10g release 3(10.1.3.0) (Build 041129)): oracle.toplink.exceptions.ValidationException
[java] Exception Description: Cannot acquire data source [jdbc/OracleDS].
[java] Internal Exception: javax.naming.NameNotFoundException: jdbc/OracleDS not found
[java] at oracle.toplink.exceptions.ValidationException.cannotAcquireDataSource(ValidationException.java:208)
[java] at oracle.toplink.internal.ejb.cmp.oc4j.Oc4jNonJtaConnector.getOrCreateDataSource(Oc4jNonJtaConnector.java:62)
If anybody knows what the problem is please let me know.
Thanks in advance.
Bhupen

Please note that the data-source has been re-architectured in 10.1.3 DP3 and you should have DataSource as follows:
<data-sources xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:noNamespaceSchemaLocation='http://xmlns.oracle.com/oracleas/schema/data-sources-10_1.xsd' schema-major-version='10' schema-minor-version='1'>
<managed-data-source connection-pool-name='Example Connection Pool' jndi-name='jdbc/OracleDS' name='OracleManagedDS' />
<connection-pool name='Example Connection Pool' >
<connection-factory factory-class='oracle.jdbc.pool.OracleDataSource' user='scott' password='tiger' url='jdbc:oracle:thin:@localhost:1521:orcl'>
</connection-factory>
</connection-pool>
</data-sources>

Composite Primary Key in M:N CMP Entity Bean Relationship

Dear Sir/Madam,
     We are creating an Enterprise Application for our institute using EJB 2.0 specifiactions. In the course of developement, we are facing a problem in writing the CMP Entity Beans with EJB Relationships.
     We are having many to many relationship between two beans such that the primary key of one Entity Bean (let's call it A), serves as the foreign key of another Entity Bean (let's call it B). Further, this primary key of A as foreign key in B, participates in the composite key of B.
     The EJB Specifications require that the primary key field(s) of any bean (B, in our case) declared in the Primary Key class should be the subset of the 'cmp-field' declared in the deployment descriptor for that bean. As I said earlier, we have many to many relationship at play. Hence, we require to keep the foerign key in the 'cmr-field' in lieu of 'cmp-field'. In short, the component of primary key is in 'cmr-field' while, it is needed in both 'cmp-field' and 'cmr-field'. That's perfect from Database point of view but illogical from CMP Entity Bean's view.
     How can we write the deployment descriptor for such a CMP (BMP is working fine for above scenario) Entity Bean? Also, how can we write the Primary Key class? The problem is not just to find the solution, but find under the hood of EJB 2.0 specifications.
     Please help.

I think you should realise that it would not be convenient to use CMP for everything. It is difficult to define complex relations using CMP. Mostly BMP os preferd since it gives the flexibility for the bean developer.
Regards
xH4x0r

RE: Consuming and Creating a CMP Entity Bean

Hi There,
I have been trying to find an answer for 1 day. I don't know ehre to look next.
I am creating a CMP entity bean. I have created all the set and get mehtods as abstract functions. I have added a ejbCreate and a matching ejbPostCreate. The class code looks like this.
public abstract class COrderBean implements EntityBean {
     protected EntityContext entctx;
     //abstract declarations of property accessors
     public abstract int getId();
     public abstract void setId(int intid);
     public abstract String getCustomerID();
     public abstract void setCustomerID(String strcustomerid);
     public abstract Date getDate();
     public abstract void setDate(Date datorder);
     public abstract String getNotes();
     public abstract void setNotes(String strnotes);
     public void ejbActivate() {}
     public void ejbPassivate() {}
     public void ejbRemove() {}
     public void ejbLoad() {}
     public void ejbStore() {}
     public void setEntityContext(EntityContext context)
          entctx = context;
     public void unsetEntityContext()
          entctx = null;
     public COrderPK ejbCreate()
          return null;
     public COrderPK ejbCreate(int new_id, String new_customerid, Date new_order_date, String new_notes) throws CreateException
          setId(new_id);
          setCustomerID(new_customerid);
          setDate(new_order_date);
          setNotes(new_notes);
          return new COrderPK(getId());
     public void ejbPostCreate(int id, String customerid, Date order_date, String notes) {}
My client code works with both BMP entity beans and session beans. It is shown below. I am working with Sun's Application Server 8.0 and I created the database schema with the capture-schema.exe command.
Properties prps = new Properties();
          props.put("javax.rmi.CORBA.UtilClass","com.sun.corba.ee.impl.javax.rmi.CORBA.Util");
          props.put("org.omg.CORBA.ORBClass","com.sun.corba.ee.impl.orb.ORBImpl");
          props.put("org.omg.CORBA.ORBSingletonClass","com.sun.corba.ee.impl.orb.ORBSingleton");
          Context context = new InitialContext(props);
          Object obj = context.lookup("corbaname:iiop:localhost:3700#COrderBean");
          //Object obj = context.lookup("entitybean.OrderItem");
               IOrderHome home = (IOrderHome)PortableRemoteObject.narrow(obj,Class.forName("ctaejb.entitybean.order.IOrderHome"));
               //use create
               IOrderRemote remote = home.findByPrimaryKey(new COrderPK(1));
               System.out.println(remote.getDate().toString());
I am getting the follwing error. Can someone please help. Thanks in advance.
WARNING: "IOP00810257: (MARSHAL) Could not find class"
org.omg.CORBA.MARSHAL: vmcid: SUN minor code: 257 completed: Maybe
     at com.sun.corba.ee.impl.logging.ORBUtilSystemException.couldNotFindClass(ORBUtilSystemException.java:7987)
     at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1013)
     at com.sun.corba.ee.impl.encoding.CDRInputStream.read_value(CDRInputStream.java:259)
     at com.sun.corba.ee.impl.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:1989)
     at com.sun.corba.ee.impl.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:2213)
     at com.sun.corba.ee.impl.io.IIOPInputStream.inputObject(IIOPInputStream.java:1221)
     at com.sun.corba.ee.impl.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:400)
     at com.sun.corba.ee.impl.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:330)
     at com.sun.corba.ee.impl.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:296)
     at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1034)
     at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:879)
     at com.sun.corba.ee.impl.encoding.CDRInputStream.read_value(CDRInputStream.java:255)
     at com.sun.corba.ee.spi.servicecontext.UEInfoServiceContext.<init>(UEInfoServiceContext.java:30)
     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
     at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
     at com.sun.corba.ee.spi.servicecontext.ServiceContextData.makeServiceContext(ServiceContextData.java:114)
     at com.sun.corba.ee.spi.servicecontext.ServiceContexts.unmarshal(ServiceContexts.java:195)
     at com.sun.corba.ee.spi.servicecontext.ServiceContexts.get(ServiceContexts.java:365)
     at com.sun.corba.ee.spi.servicecontext.ServiceContexts.get(ServiceContexts.java:353)
     at com.sun.corba.ee.impl.protocol.CorbaClientRequestDispatcherImpl.processResponse(CorbaClientRequestDispatcherImpl.java:470)
     at com.sun.corba.ee.impl.protocol.CorbaClientRequestDispatcherImpl.marshalingComplete(CorbaClientRequestDispatcherImpl.java:327)
     at com.sun.corba.ee.impl.protocol.CorbaClientDelegateImpl.invoke(CorbaClientDelegateImpl.java:158)
     at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.invoke(StubInvocationHandlerImpl.java:129)
     at com.sun.corba.ee.impl.presentation.rmi.bcel.BCELStubBase.invoke(Unknown Source)
     at ctaejb.entitybean.order._IOrderHome_DynamicStub.findByPrimaryKey(_IOrderHome_DynamicStub.java)
     at mainapp.CTestApplication.main(CTestApplication.java:32)
Caused by: java.lang.ClassNotFoundException
     ... 27 more
org.omg.CORBA.UNKNOWN: vmcid: 0x0 minor code: 0 completed: Maybe
     at com.sun.corba.ee.spi.servicecontext.UEInfoServiceContext.<init>(UEInfoServiceContext.java:34)
     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
     at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
     at com.sun.corba.ee.spi.servicecontext.ServiceContextData.makeServiceContext(ServiceContextData.java:114)
     at com.sun.corba.ee.spi.servicecontext.ServiceContexts.unmarshal(ServiceContexts.java:195)
     at com.sun.corba.ee.spi.servicecontext.ServiceContexts.get(ServiceContexts.java:365)
     at com.sun.corba.ee.spi.servicecontext.ServiceContexts.get(ServiceContexts.java:353)
     at com.sun.corba.ee.impl.protocol.CorbaClientRequestDispatcherImpl.processResponse(CorbaClientRequestDispatcherImpl.java:470)
     at com.sun.corba.ee.impl.protocol.CorbaClientRequestDispatcherImpl.marshalingComplete(CorbaClientRequestDispatcherImpl.java:327)
     at com.sun.corba.ee.impl.protocol.CorbaClientDelegateImpl.invoke(CorbaClientDelegateImpl.java:158)
     at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.invoke(StubInvocationHandlerImpl.java:129)
     at com.sun.corba.ee.impl.presentation.rmi.bcel.BCELStubBase.invoke(Unknown Source)
     at ctaejb.entitybean.order._IOrderHome_DynamicStub.findByPrimaryKey(_IOrderHome_DynamicStub.java)
     at mainapp.CTestApplication.main(CTestApplication.java:32)

Forget it. All the code works. I didn't know that the Sun App Server required a Persistence Manager to work with CMP entity beans. Once I added the persistence manager, all was OK. Have a good day.

Exception in calling a CMP Entity Bean

I have deployed a simple CMP entity bean using jboss App. server, Now while executing the client i got the following exception,
error in clientjavax.naming.CommunicationException [Root exception is java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: org.jnp.interfaces.FastNamingProperties (no security manager: RMI class loader disabled)]
regards,
NaveenBabu.A

Hi,
It is likely that some libraries are missing in your client environment. (it has nothing to do with security)
Make sure that the libraries in JBoss client (folder your_jboss_folder/client) are in your client application classpath. In particular, look for jnp-client.jar.
This should solve the problem.
Bruno Collet
http://www.practicalsoftwarearchitect.com

Bad Performance/OutOfMemory Error in CMP Entity Bean with Large DB

Hello:
I have an CMP Entity deployed on WLS 7.0
The entity bean maps to a table that has 97,480 records.
It has a finder: findAll() -- SELECT OBJECT(e) FROM Equipment e
I have a JSP client that invokes the findALL()
The performance is very poor ~ 150 seconds just to perform the findAll() - (Benchmark
from within the JSP code)
If more than one simultaneous call is made then I get outOfMemory Error.
WLS is started with max memory of 512MB
EJB is deployed with <max-beans-in-cache>100000</max-beans-in-cache>
(without max-beans-in-cache directive the performance is worse)
Is there any documentation available to help us in deploying CMP Entity Beans
with very large number of records (instances) ?
Any help is greatly appreciated.
Regards
Rajan

Hi
You should use a Select Method, it does support cursors.
Or a Home Select Method combination.
Regards
Thomas
WLS is started with max memory of 512MB
EJB is deployed with <max-beans-in-cache>100000</max-beans-in-cache>>
(without max-beans-in-cache directive the performance is worse)>
Is there any documentation available to help us in deploying CMP
Entity Beans with very large number of records (instances) ? Any help
is greatly appreciated.>
Regards>
Rajan>
>
"Rajan Jena" <[email protected]> schrieb im Newsbeitrag
news:3dadd7d1$[email protected]..
>
Hello:
I have an CMP Entity deployed on WLS 7.0
The entity bean maps to a table that has 97,480 records.
It has a finder: findAll() -- SELECT OBJECT(e) FROM Equipment e
I have a JSP client that invokes the findALL()
The performance is very poor ~ 150 seconds just to perform the findAll() -(Benchmark
from within the JSP code)
If more than one simultaneous call is made then I get outOfMemory Error.
WLS is started with max memory of 512MB
EJB is deployed with <max-beans-in-cache>100000</max-beans-in-cache>
(without max-beans-in-cache directive the performance is worse)
Is there any documentation available to help us in deploying CMP EntityBeans
with very large number of records (instances) ?
Any help is greatly appreciated.
Regards
Rajan

CMP Entity Bean with ejb-ql finder methods and INFORMIX database

Hi,
I have some CMP Entity Beans with finder methods defined in ejb-ql. In my ejb-jar, within <entity> definitions I have something like:
    <entity>
      <abstract-schema-name>BeanName</abstract-schema-name>
      <cmp-field><field-name>fieldOne</field-name></cmp-field>
      <cmp-field><field-name>fieldTwo</field-name></cmp-field>
      <query>
        <query-method>
          <method-name>findAll</method-name>
          <method-params></method-params>
        </query-method>
        <ejb-ql>SELECT OBJECT(o) FROM BeanName o</ejb-ql>
      </query>
    <entity>
And in persistent.xml:
<db-properties>
     <data-source-name>datasource_name</data-source-name>
</db-properties>
<entity-bean>
     <ejb-name>BeanName</ejb-name>
     <table-name>table_name</table-name>
     <field-map key-type="NoKey">
     <field-name>fieldOne</field-name>
     <column><column-name>column_one</column-name></column>
      </field-map>
     <field-map key-type="NoKey">
     <field-name>fieldTwo</field-name>
     <column><column-name>column_two</column-name></column>
      </field-map>
      <finder-descriptor>
          <method-name>findAll</method-name>
          <method-params/>
     </finder-descriptor>
Once deployed, on server side, I can found a java source file (with corresponding compiled class file) in path:
j2ee/cluster/server0/apps/companyName/MyEARApp/EJBContainer/temp/temp38837373733/route/to/package/
with names:
BeanName0_0pm.java
BeanName0_0PM.class
and the generated java file contains this code:
public java.util.Enumeration ejbFindAll() throws javax.ejb.FinderException, javax.ejb.EJBException {
    TransactionContext tc = pm.getTransactionContext();
    Connection conn = null;
    PreparedStatement pSt = null;
    ResultSet ejb_rs = null;
    int status = javax.transaction.xa.XAResource.TMSUCCESS;
    try {
      conn = pm.getConnectionForFindMethod();
      pSt = conn.prepareStatement("SELECT \"O\".\"COLUMN_ONE\",\"O\".\"COLUMN_TWO\", FROM \"TABLE_NAME\" \"O\"");
      ejb_rs = pSt.executeQuery();
I'm trying to call this method but it throws a SQLException when preparing the statement.
It seems that Informix does not like this SQL syntax because of upper case names, doble quotes on table alias, or something else.
When editing persistent.xml in netweaver, I can define the element <datasource-vendor> as ORACLE, SAPDB, MS_SQL_SERVER, DB2_UDB_AS400 or DB2_UDB_OS390 but INFORMIX is not an accepted value.
Is there any way to define how this SQL query is build?
Thanks in advance.

The return type of the finder method defined in the remote home interface is either the entity bean's remote interface or a collection of objects implementing the entity bean's remote interface. The return type of the finder method defined in the local home interface is either the entity bean's local interface or a collection of objects implementing the entity bean's local interface

RE: Accessing a CMP Entity Bean

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