EJB 30 begginner question
I am trying to write a simple program to populate a table through entity beans using ejb30 with annotations. Being a begginner my question could be completely idiotic, please bear with me :)
I am using toplink as my persistence provider and i get this stracktrace
INFO: Hibernate EntityManager 3.3.1.GA
javax.persistence.PersistenceException: No Persistence provider for EntityManager named FormStorePersistenceService: Provider named oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider threw unexpected exception at create EntityManagerFactory:
oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException
Local Exception Stack:
Exception [TOPLINK-30005] (Oracle TopLink Essentials - 2.0 (Build b58g-fcs (09/07/2007))): oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException
Exception Description: An exception was thrown while searching for persistence archives with ClassLoader: sun.misc.Launcher$AppClassLoader@a39137
Internal Exception: java.lang.NullPointerException
at oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException.exceptionSearchingForPersistenceResources(PersistenceUnitLoadingException.java:143)
at oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.createEntityManagerFactory(EntityManagerFactoryProvider.java:169)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:110)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:83)
at com.spireline.fs.appserver.kernel.businessprocess.formsservice.FormStoreImplTest.testFormPersistenceService(FormStoreImplTest.java:39)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:59)
at org.junit.internal.runners.MethodRoadie.runTestMethod(MethodRoadie.java:98)
at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:79)
at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:87)
at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:77)
at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:42)
at org.junit.internal.runners.JUnit4ClassRunner.invokeTestMethod(JUnit4ClassRunner.java:88)
at org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:51)
at org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:44)
at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:27)
at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:37)
at org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Caused by: java.lang.NullPointerException
at java.util.Hashtable.put(Unknown Source)
at java.util.Properties.setProperty(Unknown Source)
at oracle.toplink.essentials.internal.ejb.cmp3.xml.parser.PersistenceContentHandler.startElement(PersistenceContentHandler.java:111)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.startElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at oracle.toplink.essentials.ejb.cmp3.persistence.PersistenceUnitProcessor.processPersistenceXML(PersistenceUnitProcessor.java:151)
at oracle.toplink.essentials.ejb.cmp3.persistence.PersistenceUnitProcessor.processPersistenceArchive(PersistenceUnitProcessor.java:99)
at oracle.toplink.essentials.ejb.cmp3.persistence.PersistenceUnitProcessor.getPersistenceUnits(PersistenceUnitProcessor.java:89)
at oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializer.initPersistenceUnits(JavaSECMPInitializer.java:236)
at oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializer.initialize(JavaSECMPInitializer.java:255)
at oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.createEntityManagerFactory(EntityManagerFactoryProvider.java:155)
... 25 more
Provider named oracle.toplink.essentials.PersistenceProvider threw unexpected exception at create EntityManagerFactory:
oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException
Local Exception Stack:
Exception [TOPLINK-30005] (Oracle TopLink Essentials - 2.0 (Build b58g-fcs (09/07/2007))): oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException
Exception Description: An exception was thrown while searching for persistence archives with ClassLoader: sun.misc.Launcher$AppClassLoader@a39137
Internal Exception: java.lang.NullPointerException
at oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException.exceptionSearchingForPersistenceResources(PersistenceUnitLoadingException.java:143)
at oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.createEntityManagerFactory(EntityManagerFactoryProvider.java:169)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:110)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:83)
at com.spireline.fs.appserver.kernel.businessprocess.formsservice.FormStoreImplTest.testFormPersistenceService(FormStoreImplTest.java:39)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:59)
at org.junit.internal.runners.MethodRoadie.runTestMethod(MethodRoadie.java:98)
at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:79)
at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:87)
at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:77)
at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:42)
at org.junit.internal.runners.JUnit4ClassRunner.invokeTestMethod(JUnit4ClassRunner.java:88)
at org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:51)
at org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:44)
at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:27)
at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:37)
at org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Caused by: java.lang.NullPointerException
at java.util.Hashtable.put(Unknown Source)
at java.util.Properties.setProperty(Unknown Source)
at oracle.toplink.essentials.internal.ejb.cmp3.xml.parser.PersistenceContentHandler.startElement(PersistenceContentHandler.java:111)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.startElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at oracle.toplink.essentials.ejb.cmp3.persistence.PersistenceUnitProcessor.processPersistenceXML(PersistenceUnitProcessor.java:151)
at oracle.toplink.essentials.ejb.cmp3.persistence.PersistenceUnitProcessor.processPersistenceArchive(PersistenceUnitProcessor.java:99)
at oracle.toplink.essentials.ejb.cmp3.persistence.PersistenceUnitProcessor.getPersistenceUnits(PersistenceUnitProcessor.java:89)
at oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializer.initPersistenceUnits(JavaSECMPInitializer.java:236)
at oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializer.initialize(JavaSECMPInitializer.java:255)
at oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.createEntityManagerFactory(EntityManagerFactoryProvider.java:155)
... 25 more
The following providers:
org.hibernate.ejb.HibernatePersistence
Returned null to createEntityManagerFactory.
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:154)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:83)
at com.spireline.fs.appserver.kernel.businessprocess.formsservice.FormStoreImplTest.testFormPersistenceService(FormStoreImplTest.java:39)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:59)
at org.junit.internal.runners.MethodRoadie.runTestMethod(MethodRoadie.java:98)
at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:79)
at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:87)
at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:77)
at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:42)
at org.junit.internal.runners.JUnit4ClassRunner.invokeTestMethod(JUnit4ClassRunner.java:88)
at org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:51)
at org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:44)
at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:27)
at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:37)
at org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
my persistence.xml is in the classes/META-INF directory("classes" directory is in the classpath).My persistence.xml is shown below.
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0">
<persistence-unit name ="FormStorePersistenceService" transaction-type="RESOURCE_LOCAL">
<class>com.spireline.fs.appserver.kernel.dao.publication.Publication</class>
<provider>oracle.toplink.essentials.PersistenceProvider</provider>
<properties>
<property name="toplink.jdbc.driver">com.microsoft.sqlserver.jdbc.SQLServerDriver</property>
<property name="toplink.jdbc.password">narsi40</property>
<property name="toplink.jdbc.username">narsi40</property>
<property name="toplink.jdbc.url">jdbc:sqlserver://testdb:1433;databaseName=narsi40</property>
</properties>
</persistence-unit>
</persistence>
It looks like the processes throws a nullpointerexception when it is parsing the above persistence.xml file and for the life of me i can't understand why !!!?
Also i am bit baffled that it is trying to look for hibernate classes as it does specifiy
*"org.hibernate.ejb.HibernatePersistence" as its provider, even though i have specified toplink as the provider in the persistence.xml. Can somebody explain what is happening here.*
Thanks in advance
Narsi
I have already tried to google smack it..with no luck of course. Will post this in the hibernate forum.
Thanks
Narsi
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dear friends
if any body is having a real time ejb interview question , pl. send me a link for that.
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Hi All,
I am new to EJB technology and i am learning EJB without training canter. I am just going through Java EE tutorials available on www.oracle.com .
My knowledge of EJB Session bean say:
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Read-mostly pattern & EJB-QL question when using Weblogic 8.1
I want to use the same implementation of an CMP entity bean for the
read-mostly pattern in BEA Weblogic 8.1 (means for the reader and the
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Therefore my ejb-jar.xml contains the following statements:
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<local-home>mypackage.MyBeanLocalHome</local-home>
The weblogic-ejb-jar.xml and weblogic-cmp-rdbms-jar.xml have the proper
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I can deploy this bean & for the corresponding session bean binding
and calling methods works for the (virtual) read-only and read-write
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When we are using Xdoclet and ejb.finder methods e.g.
@ejb.finder
signature="java.util.Collection findAllValid(java.util.Date date)"
result-type-mapping="Local"
query="SELECT DISTINCT OBJECT(u) FROM MYTABLE AS u
WHERE (?1 >= u.validFrom) AND ((u.validUntil IS NULL)
OR (?1 <= u.validUntil))"
the compilation and packaging runs well (as usual).
During the deploy to Weblogic 8.1 we get errors, because the
implementation of MyBeanReadOnly's findAllValid(...) should return
objects of type MyBeanReadOnly instead of MyBean.
Is there a way to solve this problem
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the Weblogic 5.1 sample implementation?
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Thanks for any further information.
Wolfgangsurya jeedigunta wrote:
We are using Weblogic 8.1 SP2 and our Oracle Database is of version 9.2.0.5.
I created user ID 'testa' in the database which owns all the objects.
I created another userID 'testb' which has privileges to read, modify and delete data from tables owned by testa.
I created public synonyms for all the objects owned by testa.
I set the userid 'testb' and password in weblogic administrator window and set the same in reg.xml file also.
Now when I tried to install the application, I got the following errors:
BEGINNING INSTALLATION
START INSTALLING FORMS SECTION
Installing Form ./dataform/EventHistory.xml...<ErrorStack>
<Error>
<Code>FORM_045</Code>
<Msg><![CDATA[ Form "Form" schema lacks some required columns:
Field=ID column=ID does not exist in table=QSTForm
Field=Name column=Name does not exist in table=QSTForm
Field=Version column=Version does not exist in table=QSTForm
Field=Content column=Content does not exist in table=QSTForm
Field=LastModified column=LastModified does not exist in table=QSTForm ]]></Msg>
</Error>
<Error>
<Code>FORM_7</Code>
<Msg><![CDATA[ Failed to bind FDT columns, exception com.quovadx
.bpms.core.CWException: (FORM_045) Form "Form" schema lacks some required column
s:
Field=ID column=ID does not exist in table=QSTForm
Field=Name column=Name does not exist in table=QSTForm
Field=Version column=Version does not exist in table=QSTForm
Field=Content column=Content does not exist in table=QSTForm
Field=LastModified column=LastModified does not exist in table=QSTForm ]]></Msg>
</Error>
My question is :
does weblogic 8.1 works when I use public synonyms and user id other than the schema owner ID?
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Thank YouHi. I wish I could help you more, but so far, from what symptoms you've shown us,
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I have a burning question regarding EJBs and classpaths.
Here is my situation:
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also used by my servlets.
- Each EJB is deployed in a separate JAR file
The question I have is which classes should be included in the EJB JAR
files.
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put everything else in a common JAR that is placed in my WEB-INF/lib
folder and shared by the rest of the application. However, if I do
that, Weblogic won't load the EJBs because it tries to do so before it
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I can explicitly add my jar to the Weblogic classpath on the
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problem.
The third option is to include all the dependent classes in my EJB
jars themselves, in addition to deploying them in WEB-INF/lib. This
works, but it bothers me that there are multiple copies of the same
class files lying around.
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Thanks.Use a ClassPath entry in your EJB jar module MANIFEST.MF file
Mark Cordobal
[email protected] (Frank LaRosa) wrote:
Hi,
I have a burning question regarding EJBs and classpaths.
Here is my situation:
- My application uses EJBs, Servlets and JSP pages
- My EJB remote interfaces and implementation classes extend common,
abstract base classes
- My EJB implementation classes use several utility classes, which are
also used by my servlets.
- Each EJB is deployed in a separate JAR file
The question I have is which classes should be included in the EJB JAR
files.
I'd like to put just the EJB implementation class in the EJB JAR, and
put everything else in a common JAR that is placed in my WEB-INF/lib
folder and shared by the rest of the application. However, if I do
that, Weblogic won't load the EJBs because it tries to do so before it
deploys my web app, and hence before it adds the JARs in the
WEB-INF/lib folder to its classpath.
I can explicitly add my jar to the Weblogic classpath on the
commandline (weblogic.class.path property). Now my EJBs load. However,
my servlets become unable to load any classes from any jar in
WEB-INF/lib. I read something about it being a bad idea to include a
jar from WEB-INF/lib in the classpath, so I'm probably seeing that
problem.
The third option is to include all the dependent classes in my EJB
jars themselves, in addition to deploying them in WEB-INF/lib. This
works, but it bothers me that there are multiple copies of the same
class files lying around.
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classes with a servlet or JSP page. What's the proper way to do this?
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Any thoughts from gurus or those who have skinned their knees on similar
issues would be GREATLY appreciated!
Environment:
Weblogic 6.1 sp3/Oracle 8.1.7 on Solaris
I've got a webservice that invokes the webservice ejb and then delegates
down to business layer ejb that delegates down to data layer dao classes
that store off on average 150 records which include a clob field containing
about 4k of data. (All in one JTA transaction) (I'll refer to this as
operation 1)
There is a logically independent process (parsing the clob data elements)
that I'd like to kick off after all 150 records have been stored. (Needs
access to the committed data) (I'll refer to this as operation 2)
Questions:
1. Can a stateless session ejb running under a single phase JTS transaction
safely post a message to a JMS topic or queue running on the same weblogic
instance?
2. If so, are there any guidelines as to whether the transaction for
operation 1 will complete before the sender receives notification? (the
concern being that operation 2 will be notified but the data it is
interested in will not be visible yet) If no guarantees, would configuring
a JMS message delivery delay help?
3. This operation will get invoked perhaps a thousand times a day, and I'm
fearful of falling into the message redelivery trap from transaction
rollbacks which possibly could occur from operation 2. Above all else, I
care about NOT having the queue get clogged up with resends. Given that
bias, should I use NOTSUPPORTED then have the session bean that the MDB
delegates to start a transaction or would using BMT from the MDB be more
correct?
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Thanks!Alan May wrote:
Any thoughts from gurus or those who have skinned their knees on similar
issues would be GREATLY appreciated!
Environment:
Weblogic 6.1 sp3/Oracle 8.1.7 on Solaris
I've got a webservice that invokes the webservice ejb and then delegates
down to business layer ejb that delegates down to data layer dao classes
that store off on average 150 records which include a clob field containing
about 4k of data. (All in one JTA transaction) (I'll refer to this as
operation 1)
There is a logically independent process (parsing the clob data elements)
that I'd like to kick off after all 150 records have been stored. (Needs
access to the committed data) (I'll refer to this as operation 2)
Questions:
1. Can a stateless session ejb running under a single phase JTS transaction
safely post a message to a JMS topic or queue running on the same weblogic
instance?So is the first transaction going to be writing 150 records to the
database and the publishing a JMS message? Yes, this can all be one in
one transaction in WLS, but it will be a XA/2PC transaction. I'm
curious why you specified single-phase?
>
2. If so, are there any guidelines as to whether the transaction for
operation 1 will complete before the sender receives notification? (the
concern being that operation 2 will be notified but the data it is
interested in will not be visible yet) I'm not sure I follow you here. If the message publish is part of the
transaction then no consumer will receive the message before the publish
transaction commits.
If no guarantees, would configuring a JMS message delivery delay help?
3. This operation will get invoked perhaps a thousand times a day, and I'm
fearful of falling into the message redelivery trap from transaction
rollbacks which possibly could occur from operation 2. There's 2 important WLS JMS features I would suggest you look into:
1) Message redelivery delay & limits
2) Error destinations
Take a look at
http://e-docs.bea.com/wls/docs81/jms/implement.html#1255066
Above all else, I
care about NOT having the queue get clogged up with resends. Given that
bias, should I use NOTSUPPORTED then have the session bean that the MDB
delegates to start a transaction or would using BMT from the MDB be more
correct?I think you'd be better off using redelivery limits and delay than
trying to do the JMS acknowledgement and transaction management yourself.
-- Rob
>
4. Any other thoughts?
Thanks! -
To EJB or Not to EJB (Design Question)
Hello,
New to EJB i am devlepoing a simple test App. Your suggestions will be very valuable.
Test App..
- Authenticate process
- Search for Orders
Our compnay policy forces that We must validate the sessionID (created internally) on every page call. Expected Client maybe Web srvices/servlet/JSP. Multiple users and heavy traffic expected.
My Design...
- Make Stateless Session EJBs for Authentication
- Make Stateless Session EJBs for Orders search. Number of functions will be exposed for searching.
Questions
- Does it make sense to wrap all the SQL select calls in SESSION EJB? or should i call from JSP directly
- IS SEESION EJB for authentication is the right choice
- which is the best place for using Entity EJBs
Regards
HA good app. design would be as follows:
Use three "Application Layers"
1. PRESENTATION LAYER: this layer includes
-JSP (only for view purposes!!!)
-FrontController (Pattern usally implemented as Servlet for handling authentication/authorisation AND session handling!!!!!!)
-ServiceDispatcher (Pattern for dispatching ;-))
-BusinessDelegate (for encapsulation from the BUSINESS LAYER)
2. BUSINESS LAYER: this layer includes
-SessionFacade (usally Stateless Session Beans for your needs for example order!!!)
3. PERSISTENCE LAYER: this layer includes
-EntityBeans (CMP or BMP you must decide wich is better for your needs....I prefer BMP, it is more coding, but you are not dependent on app. server provider....CMP runs faster!!!!)
-DataAccessObject (DAO--> here are your sql-statements and db-connections)
For all Patterns here look at this side for more information
http://java.sun.com/blueprints/corej2eepatterns/Patterns/
TIP: Use the Session API for your session handling!!!!!!!!!!!!
Regards
howmad23 -
I have the following EJB QL query:
SELECT object(ep) FROM Endpoint ep WHERE ep.sipAddress = :sipAddressWhen this was written sipAddress was a String ( with getter & setter) attribute within Endpoint.
Now we have added a new Table called Address (since an endpoint can have more than one address). Endpoint class contains:
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
private Collection<Address> addresses = new ArrayList<Address>();
public Collection<Address> getAddresses() {
return addresses;
}In my Address entity we have a boolean 'defaultValue' to determine if address is default.
Question:
How will my ejb ql change?
//mikeeraonel wrote:
Question:
How will my ejb ql change? that depends. what exactly do you want the query to do? find the endpoint with any matching address? find the endpoint with a "default" matching address?
assuming you want the endpoint with any matching address, i'd go with the WHERE clause:
:sipAddress MEMBER OF ep.sipAddress -
Hi everybody!
As I am a newbie to EJB, but have to do a project with this technology, I have a basic question, that might seem very simple to the pros among you.
I have to realise a system with an login at the beginning, but I am very unsure about how to realise this.
I started by creating a table, holding the username and the password.
Now I thaught about creating an enity bean, that checks if the user with the given password exists. Here is my first problem, entity beans only allow findbyPrimary() but i want to find a person by name and password. Is this possible? how?
If the person exists in the DB i thaught about creating a new instance of an session bean, for the further transactions and pass the reference on to the user?
Is this good?
Please help!
Thx in Advance!
StefYou can certainly find a user via the name/password options. You need to implement a new finder for your entity bean - like findByUsernameAndPassword that accepts the 2 parms. The implementation is a little specific to the application server vendor, but it should be pretty easy to do regardless of the proprietary descriptors. Also, depending on the caching you're using on the enttity tier - using direct JDBC for along with entitiy beans can cause some issues. For example, you may have a specific instance of an entity bean that's cached in memory on the application server - they you change this using JDBC. The application server now has a stale version of the data - but it doesn't know that it's stale. Just some issues to consider.
Cheers -
Hi there,
My questions here referred to WebLogic server 6.1 examples.ejb20.basic.statelessSession
and I m yet not attended any J2EE classes yet.
1. What does the method ejbPassivate() and setSessionContext(SessionContext ctx)
invoked inside TraderBean class does? Since I can't find any codes called the setSessionContext
that needs a input parameter?
2. Under ejbCreate(), the line statd Integer tl = (Integer) ic.lookup("java:/comp/env/tradeLimit");,
where do i get java:/comp/env/tradeLimit? Is that stated inside the ejb-jar.xml under
the entry <env-entry>?
3. Can explain what are the steps invoked inside the build.xml after compiling the
class files?
4. What does the weblogic-ejb-jar.xml does?
Thanks
NeoFor 1 & 2 You need to read a EJB Book. There is a free one available at
www.theserverside.com.
for 4, look at
http://e-docs.bea.com/wls/docs61/ejb/index.html
"Neo Gigs" <[email protected]> wrote in message
news:3cbe4ab1$[email protected]..
>
Hi there,
My questions here referred to WebLogic server 6.1examples.ejb20.basic.statelessSession
and I m yet not attended any J2EE classes yet.
1. What does the method ejbPassivate() andsetSessionContext(SessionContext ctx)
invoked inside TraderBean class does? Since I can't find any codes calledthe setSessionContext
that needs a input parameter?
2. Under ejbCreate(), the line statd Integer tl = (Integer)ic.lookup("java:/comp/env/tradeLimit");,
where do i get java:/comp/env/tradeLimit? Is that stated inside theejb-jar.xml under
the entry <env-entry>?
3. Can explain what are the steps invoked inside the build.xml aftercompiling the
class files?
4. What does the weblogic-ejb-jar.xml does?
Thanks
Neo -
I am totally new to EJB and I have gone through Sun's tutorial at http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/GettingStarted.html and I've got everything in the tutorial working with the Sun J2EE server installed on my computer. They teach you how to write a bean and call it from a client application and from a .JSP page using the web server installed with J2EE on port 8080. Now, I want to call it from my ColdFusionMX page using the CFMX web server and I can't figure it out. Can anybody help me? I'm not sure what I need to do in CFMX to get the Java bean to work. I realize this is also a question for the ColdFusion community, but I'm sure connecting from ColdFusion is not very much different than from other languages.
I created a very watered down ColdFusion version of the JSP page provided by Sun in the EJB tutorial. However, it looks like the JNDI lookup is not working for some reason. I think the problem is that I need to specify that the lookup will occur on my JNDI port, which is 10500 on my local host. It looks like it is trying to use a ColdFusion JNDI service that does not have the EJB installed or something like that. I would appreciate some code samples of how to get this to work. I can't find any good sites that give you a walk through of how this is supposed to work.
Keep in mind this does work when I call the .JSP version of this page through the J2EE web server. The trick is for me to get this working in ColdFusion.
Thanks everybody!
Jon
test.cfm
<%@page import =
"java.math.*,javax.naming.*,javax.rmi.PortableRemoteObject,java.rmi.RemoteEx
ception,Converter,ConverterHome" %>
<html>
<head>
<title>Converter</title>
</head>
<body bgcolor="white">
<cfscript>
initialContext = createObject("java", "javax.naming.InitialContext");
ejbHome = initialContext.lookup("java:comp/env/ejb/TheConverter");
</cfscript>
I hope this page doesn't throw an error.
</body>
</html>
page output
Error Occurred While Processing Request
No such binding: ejb
The Error Occurred in C:\CFusionMX\wwwroot\test.cfm: line 51
49 : initialContext = createObject("java", "javax.naming.InitialContext");
50 :
51 : ejbHome = initialContext.lookup("java:comp/env/ejb/TheConverter");It looks like it is
trying to use a ColdFusion JNDI service that does not
have the EJB installed or something like that. maybe... I am not familiar with CF.
I would
appreciate some code samples of how to get this to
work. Install trial version of JRun 4.0, it has code samples how to call EJB from CF script.
good luck
Maris -
In the EJB Specs that I have been working with (1.1), whenever you make an entity bean, you have to specify the PK ID for the bean you wish to create. This ID goes into the database for the Server to be able to persist / find your bean. My question is:
Why do I have to specify the PK ID when I create a bean? Why can't I just call ejbCreate() and have it return an ID to me? So the Server and the Database could handle making sure that it is not a duplicate key. I find it creates more work than necessary that I have to figure out what PK ID is not taken yet and create that one, when if I used an IDENTITY field in a database, that could easily do it for me.
Anyone know why they chose to FORCE developers / (and Server admins not) to choose the PK ID? Why not give us the option of either having the server do it and return the ID, or us choosing it?
Anyone have thoughts on this?
RobertHi,
Although it would have been a lot easier, they
propably didn't define this in the EJB specs this way
to stay compatible with all databases. Not all
databases support the IDENTITY field. I remember there
were some interesting discussions about other ways to
define a PK on www.theserverside.com.Yeah, but that's why they could give you a choice, so that if you didn't want to do it, or your db didn't support it, you wouldn't have to do that. -
Hi,
I am new to EJB framework and I have a question.
I want to access an EJB from another EJB. These two EJBs are in different EARs, and maybe on different servers. How can one accomplish this?
Moreover, I want to create some wrapper classes for the first EJB in order to make the accessing process of the EJB easier.
Is it good to create a new jar and pack this with the second EJB or to pack this with the client of the first EJB?
I hope I have explained my question properly.
Right now I saw that there is a section for Enterprise Java Beans. Sorry for this problem and an admin should move this thread in the right section.
Edited by: mitroiasi on Dec 10, 2008 11:58 PMhttp://forum.java.sun.com/thread.jsp?thread=333894&forum=13&message=1363968
-
I new to JDeveloper and I have question about the EJB Generator. I would like to generate EJBs for tables for a database for which I don't have access to the account who owns the tables. What I see in the wizard (EJBs from Tables - CMP) is only the few tables which are owned by the account I am using. I don't think the DBAs will give me their admin account. Is there another way to do this other than hand coding?
The database is Sybase 12.5 and the JDBC Driver is jConnect 5.5. We are converting to Oracle 9i and I am researching strategies to do this. I'm not sure if my problem is platform related.
Thanks,
JamieJamie-
We're adding this feature right now, so look for it in the forthcoming JDev 9.0.4 release.
Users will be able to view accessible tables and views owned by all schemas, or filter out all but a specific schema (as we currently do, showing you only the objects owned by the default schema).
Jon -
Seemingly simple EJB-QL question
I need to retrieve a single record matching two fields, call them jib and jab. The query is easy enough:
<query>
<query-method>
<method-name>findMatchingRecord</method-name>
<method-params>
<method-param>java.lang.Integer</method-param>
<method-param>java.lang.Integer</method-param>
</method-params>
</query-method>
<ejb-ql>SELECT OBJECT(o) from MyTable o
WHERE o.jib = ?1 AND o.jab = ?2
</ejb-ql>
</query>I know there will only be a single record, because I have a unique key constraint on jib and jab. However, jab can be null, and equality comparison doesn't work with nulls. I tried something like:
WHERE (o.jib = ?1 AND o.jab = ?2) OR (o.jib = ?1 AND o.jab IS NULL AND ?2 IS NULL)Checking parameters with "IS NULL" apparently doesn't work though, even though it works in ordinary SQL. The only solution I can think of is to write two queries and force the application to decide which one to use. I'd appreciate any suggestions!
We're using BEA WebLogic 8.1 and Oracle 9i.eraonel wrote:
Question:
How will my ejb ql change? that depends. what exactly do you want the query to do? find the endpoint with any matching address? find the endpoint with a "default" matching address?
assuming you want the endpoint with any matching address, i'd go with the WHERE clause:
:sipAddress MEMBER OF ep.sipAddress
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