CMP and BMP in application

I am new to EJB, please help me on this:
Can i have mix of CMP and BMP in my application?
Is it best enforce that all entity bean in either one but not both?

You are impling that BMP is DB-dependent. The SQL generated by the >Container is nothing magical. It is no more DB independent than SQL >written by the developer. You don't have to be DB-specific to use BMP, >but you do have to be appserver-specific to use CMP.By Db independent I mean that the sql code for container call back methods is generated by Container. You dont have to do anything. If you are deploying bean for oracle or sql , container will take care for that. Refer to the specs There is brief para on advantages of CMP.
For BMP you have to change the code according to the database. Container will not do anything for that.
"2. Reduced development efforts."
Yes, marginally, but the reduction in initial development time must >be weighed against:
The tools (or lack thereof) provided to map the beans to the tablesWell even if you are working with BMP you have to be aware of that. There are various performance improvement setting which are app server specific. It doesnt matter if you are using BMP or CMP for that matter
The time spent dealing with appserver vendors when things don't workOfcourse this happens with BMP also.
The inherent limited flexibility of CMPAlmost 90 % of the scenarios can be delt with CMP. Yes if not you can use BMP.
Also if time is such a factor, you should probably be generating your >beans (either CMP or BMP). This eliminates the development effort >difference between them. Of course that means developing BMP will be >faster since you don't have to muck about with the appserver, mapping >beans, marking methods as read-only, etc.Ha... I cannot take it. In general I can say It doesnt matter if you are using BMP or CMP , you have to be aware of different performance and other settings which are app server specific.
Remember CMP is available for 2 reasons:
1) So you can minimize development effort on simple Object-to-RDB >mappingsThey now support various relationships like 1-1,1-many, many-many
2) So that the big vendors (IBM, BEA, etc.) who were involved in >drafting the spec can provide "features" not in the specification, >encouraging vendor lock-in. Any Specification is not complet or exaustive. Vendors need to fill the gap.
--Ashwani

Similar Messages

CMP and BMP configure for deploying in weblogic

how to run CMP and BMP in weblogic and configure in welogic
tell me the steps to be followed for connection pooling and deployement and configure in weblogic builder....

Disagree that CMP is always better than BMP. CMP is in reality merely an implementation of BMP that provides a declarative method of providing a persistence layer. You could easily use other declarative systems to provide the same service, but you are alway relying on BMP and when CMP fails to provide you need to return to the raw BMP.
It a bit like the difference between high/low level languages. We don't normally write direct assembly (yes, I am aware that real programmers yada yada yada) but we do use it, and sometimes you actually have to write it for specialised applications - most notably for high performance.
Both have their pluses and minuses, and you need to know when to use one over the other.

Could I build 1:N relationship between CMP and BMP?

Hi, as subject, Could I build 1:N relationship between CMP and BMP?
Thanks a lot!
a13519

Container managed relationships only apply to CMP beans. You can look at the DTD in appendix B of the EJB spec or chapter 10 where they make this distinction.

CMP and BMP

hi there,
is this true?
CMP -> JTA
BMP -> EJBContext.getUserTransaction
note: CMP uses JTA to do transaction but BMP uses EJB api to do transaction handling.
Thanks
Neo

Disagree that CMP is always better than BMP. CMP is in reality merely an implementation of BMP that provides a declarative method of providing a persistence layer. You could easily use other declarative systems to provide the same service, but you are alway relying on BMP and when CMP fails to provide you need to return to the raw BMP.
It a bit like the difference between high/low level languages. We don't normally write direct assembly (yes, I am aware that real programmers yada yada yada) but we do use it, and sometimes you actually have to write it for specialised applications - most notably for high performance.
Both have their pluses and minuses, and you need to know when to use one over the other.

Default Isolatioin level in CMP and BMP

Hi All,
If we don't set isolation in a descriptor (in case of CMP) then what is the default level ?
and what is the default level in case of BMP?
Is it a Database dependent?

Hi,
Didnt find this reference in any books/pdf?
Did u find the same?
Seetesh
isolation-level defines a valid transaction isolation level to apply to specific EJB
methods. The following are possible values for isolation-level:
TransactionReadUncommitted:: The transaction can view uncommitted updates from other transactions.
TransactionReadCommitted: The transaction can view only committed updates from other transactions.
TransactionRepeatableRead: Once the transaction reads a subset of data, repeated reads of the same data return the same values, even if other transactions have subsequently modified the data.
TransactionSerializable: Simultaneously executing this transaction multiple times has the same effect as executing the transaction multiple times in a serial fashion.
For Oracle databases only:
TransactionReadCommittedForUpdate
TransactionReadCommittedForUpdateNoWait

Which should I use (CMP or BMP) for my Web Application?

I am developing an Web Application with Oracle Database. In this work, I always use the SQL sentences in complex (Joining many tables with WHERE condition). So that, I want to be adviced in developing this web application with CMP or BMP or other opinions?
Thanks in advance!

If you want to write long (optimized) SQL queries, than you shouldnt use
entity EJB's at all.

Nobody knows this fundamental question - CMP, CMT, BMP, BMT. Surprised !!

Hello,
I've talked to many experts and read books on EJB but none of them gave me a clear cut answers. What are the definitions of CMP, CMT, BMP and BMT? No one could explain "Persistent" from "Transaction" properly. No books clearly define them at all. Some say BMP means BMT and CMP means CMT. Some others say they are totally different concept. Others even say different stories. Actually, when we create EJBs (in Visual Cafe as an example), we can tell whether the bean is CMP or BMP but there os no place where we can define the transaction mode (BMT or CMT). How come do so many people get confused about this fundamental concept? Can anybody explain them clearly please?

CMP = Container Managed Persistence
This means that the container (part of the EJB Server) automatically handles persisting your bean to a DB. So if you have an Entity Bean, for example, that has some properties (like name, size) and a table in the database with the fields name (as a varchar), size (as an integer), then when you set the bean's properties to "Joe" and "14", you can then look in your database and those values will be there. You (the developer) do not have to write any code to put those values into the DB.
BMP = Bean Managed Persistence
This means that (in the above example of an EJB with properties name, size), if you set your bean's name to "joe" and size to 14, those values will NOT go into the DB unless you (the developer) put them there.
CMT = Container Managed Transactions
A transaction is really either one statement (or action) or a bunch of them that are grouped together. If it is a group, then for any one of them to be executed / committed, they must all execute successfully. If even just one of the actions / statements fails, they all fail (or are all "rolled back", i.e. un-done)
CMT means that the container (EJB Server) will handle making sure that all the actions or statements from a transaction (i.e. a particular context of actions kicked off when an EJB is called) are completed successfully. If they are, the container will commit (execute) all the statements and return "success". If any one of them fails, the container will handle rolling back (un-doing) all the statements. This is VERY useful, as you do not need any special if statements or try-catches, the container does it for you.
BMT = Bean Managed Transaction
This means that you (the developer) will have to logically group together all that actions that you consider for a transaction. If any one of them fails, you will need to make sure all of them are rolled back and that "failure" is returned to the caller. If they are all successful, you will have to return success.
You can do this by using the below code:
(in all the code below, they may wrap from one line to the next, just pay attention to where the ";" is)
//import Transaction
import javax.transaction.UserTransaction
//make a new transaction:
UserTransaction userTran = ( UserTransaction ) initialContext.lookup("java:comp/UserTransaction");
try
//And then marking the beginning of the transaction:
userTran.begin();
//Then Do your stuff (i.e. the actions)
myPersonalBusinessMethods();
//commit the transaction cause it's all ok
userTran.commit();
catch (Exception e)
//rollback (un-do) all the stuff cause error occurred
userTran.rollback();
Hope all this helped and finally explained it! Feel free to throw some duke dollars my way if it did! ;P
Robert

Cmp and datasource

Hi,
I have a application with CMPs, and in my iAS there are 5 Data Sources.
How to configure an application to access a Data Source ?
Jordi Pinyol Essi Projects
Ingeniero de Desarrollo
[email protected] t +34 977 221 182
http://www.essiprojects.com f +34 977 230 170

Hello,I need to change at runtime the properties of
the connection, because my database has several users,
I am working with CMP EJB . How could I do it?
Thanks in advanceYou may write your own data source wich you will pass required data (user name) to through some thread oriented storage...
class Store {
static Map cache = new HashMap();
static void setUserName(String userName) {
    cache.put(new Integer(Thread.currentThread.hashCode()), userName);
static String gerUserName() {
    return (String)cache.get(new Integer(Thread.currentThread.hashCode()));
EJB:
setEntityContext(EC ec) {
   Store.setUserName(ec.getCallerPrincipal().getName());
YourDS:
getConnection() {
   return ds.getConnection(Store.getUserName(), ...);
...

CMP and capture-schema problems

I am trying to deploy a CMP on Sun App Server 8, and I'm having a few problems. I am quite new to both CMP and Sun App Server 8.
I've created a simple table Room in mySQL DB, containing only id (varchar) and description (varchar). I'm running this command to capture the table schema
capture-schema -username username -password pwd -dburl jdbc:mysql://localhost/test -driver com.mysql.jdbc.Driver -out test.dbschema
Do I need to enter the -schemaname and -table parameters as well? I'm assuming that since the url is pointing directly to the test schema in mySQL and it only contains the room table, I don't need these 2 parameters.
test.dbschema gets generated, but when I use the deployment tool and create the database mappings to the entity bean using this schema file, no mappings are created.
Any help?

Hello,
I have similar problem and I'm really confused about it.
Working with:
Java System Application Server Platform Edition 8.1 2005Q1 UR1
mysql DataSource and Container Managed Persistence
mysql-connector-java-3.0.8-stable-bin.jar
I have problem with deploy:
Fatal Error from EJB Compiler -- JDO74025: JDOCodeGenerator: Caught an Exception validating CMP bean 'Sets' in application 'isvl' module 'isvl-EJBModule': JDO72335: If the table sets for the bean corresponding to the generated class isvl.model.set.SetBean470758938_JDOState is mapped as the primary table, it must have a primary key.Choose a different primary table or verify that the contents of the schema file are correct.
Choose a different primary table or verify that the contents of the schema file are correct. at com.sun.ejb.codegen.CmpCompiler.compile(CmpCompiler.java:274) at com.sun.ejb.codegen.IASEJBC.doCompile(IASEJBC.java:615) at com.sun.ejb.codegen.IASEJBC.ejbc(IASEJBC.java:563) at com.sun.enterprise.deployment.backend.EJBCompiler.preDeployApp(EJBCompiler.java :340) at com.sun.enterprise.deployment.backend.EJBCompiler.compile(EJBCompiler.java:209) at com.sun.enterprise.deployment.backend.AppDeployer.runEJBC(AppDeployer.java:284) at com.sun.enterprise.deployment.backend.AppDeployer.deploy(AppDeployer.java:176) at com.sun.enterprise.deployment.backend.AppDeployer.doRequestFinish(AppDeployer.j ava:107) at com.sun.enterprise.deployment.phasing.J2EECPhase.runPhase(J2EECPhase.java:146) at com.sun.enterprise.deployment.phasing.DeploymentPhase.executePhase(DeploymentPh ase.java:71) at com.sun.enterprise.deployment.phasing.PEDeploymentService.executePhases(PEDeplo ymentService.java:633) at com.sun.enterprise.deployment.phasing.PEDeploymentService.deploy(PEDeploymentSe rvice.java:188) at com.sun.enterprise.deployment.phasing.PEDeploymentService.deploy(PEDeploymentSe rvice.java:520) at com.sun.enterprise.management.deploy.DeployThread.deploy(DeployThread.java:143) at com.sun.enterprise.management.deploy.DeployThread.run(DeployThread.java:172)
Have you seen this problem?
Thanks.

Can TopLink CMP and POJO persistence be mixed (for incremental migration)?

Is it possible to mix TopLink CMP and POJO persistence in one application server container? Does anyone already have experiences with such a setting?
Background: We currently maintain an application that uses Toplink as CMP 1.1 provider for its entity beans. As this architecture is quite out-dated, we'd like to move from CMP 1.1 to POJO based persistence with TopLink (native, no JPA) and Spring inside the appserver.
Is only a "big-bang" migration feasible? Or is there a way to use CMP and POJO persistence with TL side-by-side in one container? That would extremely handy allowing us to migrate each entity bean at a time.
I would very much appreciate your input/opinion!
Sebastian
Application server is Bea Weblogic 8.1SP6
Toplink version is 9.0.4.9
Java version is 1.4.2

Thank you a lot for your answer!
I understand that with SessionAccessor from the oracle.toplink.ejb.cmp package, we can get access to the current CMP session.
We'd like to use the TopLinkDaoSupport class from Spring's TL integration and for this, Spring wants a session factory injected.
Is there a way to get something like a TL session factory for use with Spring in a CMP environment?
Thanks again for your time!
Sebastian

CMP vs BMP

hi friends
coud any tell me the core benefits/asvantages of using CMP beans on the BMP ot vice versa!!!
or any disadvantage of using any specific type... with that were should be use the CMP and where BMP
thxs!

CMP is advantegous for portability. The sql statement/parameter/tuning is done outside the java code. Very good approach if you are J2EE component vendor because your client may not use to Bea, IBM, Sun, or XXXXX product.
BMP is adventegous if you know how to tune the sql by hand, by assumption that your tuned-by-hand sql far overperform the performance of CMP's SQL, otherwise CMP is still recomended. People won't use this approach if they sell J2EE component, why? Not everyone will use WebLogic+Oracle but your code is optimized for WebLogic+Oracle.
Please pardon my bad english.

What's the difference between a web site and a web application?

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http://support.peopleperhour.com/entries/68630566--C-mon-lets-Watch-The-Other-Woman-2014-full-movie-online-free
https://glossicom.zendesk.com/entries/68643806--%D0%BC-v%C9%AA%C9%9Bc-%C3%A4st-Watch-The-Lucy-2014-full-movie-free
https://cloudhance.zendesk.com/entries/68115098--%D0%BC-v%C9%AA%C9%9Bc-%C3%A4st-Watch-The-Lucy-2014-full-movie-free
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defined by its interaction with the user. That is, a website can plausibly consist of a static content repository that's dealt out to all visitors, while a web application depends on interaction and requires programmatic user input and data processing.
For example, a news site would be a "website", but a spreadsheet or a collaborative calendar would be web "applications". The news site shows essentially the same information to all visitors, while the calendar processes individual data.
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http://support.peopleperhour.com/entries/68125597--%D0%BC-v%C9%AA%C9%9Bc-%C3%A4st-Watch-The-Lucy-2014-full-movie-free
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http://support.peopleperhour.com/entries/68168787--Watch-The-Godzilla-2014-free-Online-Full-Movie-HD-Quality
https://glossicom.zendesk.com/entries/68161538--Watch-The-Godzilla-2014-free-Online-Full-Movie-HD-Quality
There is no real "difference". Web site is a more anachronistic term that exists from the early days of
the internet where the notion of a dynamic application that can respond to user input was much more limited and much less common. Commercial websites started out largely as interactive brochures (with the notable exception of hotel/airline reservation sites).
Over time their functionality (and the supporting technologies) became more and more responsive and the line between an application that you install on your computer and one that exists in the cloud became more and more blurred.
If you're just looking to express yourself clearly when speaking about what you're building, I would continue to describe something that is an interactive brochure or business card as a "web site" and something that actually *does something that feels
more like an application as a web app.
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as a web app, even though it has a lot of very user-specific functionality). If, on the other hand, it is mostly static .html files that link to one another, I would call that a web site.
Most often, these days, a web app will have a large portion of its functionality written in something that runs on the client (doing much of the processing in either javascript or actionscript, depending on how its implemented) and reaches back through some
http process to the server for supporting data. The user doesn't move from page to page as much and experiences whatever they're going to experience on a single "page" that creates the app experience for them.

...can i make as many iweb websites as i want? ...and as many blogs as i want? ...i have never made one before....
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...anyways, i know it is splitting hairs but what exactly is the diff b/w a blog and a website ....i am under the impression that a blog is just a personal newsletter sort of thing,...?

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Dear all,
Is it possible to implement SSO for both SAP and non-SAP applications without involvement of EP at all?
I have gone through this link.
<a href="http://help.sap.com/saphelp_nw04s/helpdata/en/e5/4344b6d24a05408ca4faa94554e851/frameset.htm">http://help.sap.com/saphelp_nw04s/helpdata/en/e5/4344b6d24a05408ca4faa94554e851/frameset.htm</a>
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I am trying to figure out how to open and close an application at specific times.
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CMP and BMP in application

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