Where to write SQL query in a Stateless Session Bean?
Hi
I want to query a database table from a Stateless Session Bean (SSB). I have the getter and setter methods. And am connecting to the database in ejbCreate and disconnecting in ejbRemove methods. But where should I query the database to retrieve the data? In case of a entity bean it is written in the ejbLoad but where in SSB.
Thanks in advance
Siva
Stateless Session Bean as its name indicates, it has no state, ie it should have no member variables. In another word, SLSB is method based.
Hence, if somehow you need to access to the database in one of the method, you have to open db connection and query the table in that method.
BTW, a Stateless Session Bean should not have getter and setter methods, because it should not keep any stateful information.
--lichu
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We are writing a J2EE application and using Weblogic 5.1 on Unix machine. We are
considering writing some Stored Procedures or Triggers on Oracle DBMS. Hence our
Stateless Session Beans / Data Access Objects (DAOs) would be calling those stored
procedures, which would reside on Oracle 8.1.7 (on Windows 2000). (These Data
Access Objects are running under the umbrella of a Stateless Session Beans). We
are using WebLogic's Connection Pooling.
Our question is: Would we get reliable rollbacks from our stored procedures. I
mean would the Transaction Management process of the EJB container work. Remember
the SQL is written in the Database (Oracle in this case) in the form of Stored
Procedures / Triggers through PL/SQL.
Any ideas or tips would help.
I would agree with Cameron Purdy. Be very cautious to use Oracle specific
Triggers / Stored Procedures. Consider following, (apart from what he said):
1. Unreliable behaviour of the Oracle JDBC drivers, specially 8.1.6 family..
(You may visit the Oracle's web site and see the newsgroups for the JDBC drivers).
This is enough of a reason to stop right there.
However for interest sake you may consider following issues:
2. By use of Oracle specific Triggers / SPs the application will not be portable.
Vendor Lock In. Remember your choice for J2EE compliant Server (WebLogic in this
case). The whole purpose would be defeated by going for this option.
3. There are issues related to the extensibility of the application. I have
my reservations and would hold my breath on two phase commit protocol transactions
being reliable in this scenario.
Have fun...
Terry
"Cameron Purdy" <[email protected]> wrote:
>Yes, the work performed by the SPs and the triggers would be in the same
>tx.
>
>What would NOT work is if the data has been read into WebLogic and then
>it
>gets affected by a trigger or SP on the RDBMS, the data in WebLogic is
>not
>automatically re-read within that same tx so you need to be careful.
>
>Peace,
>
>--
>Cameron Purdy
>Tangosol Inc.
>Tangosol Coherence: Clustered Coherent Cache for J2EE
>Information at http://www.tangosol.com/
>
>
>"Ahmad" <[email protected]> wrote in message
>news:[email protected]...
>>
>> We are writing a J2EE application and using Weblogic 5.1 on Unix machine.
>We are
>> considering writing some Stored Procedures or Triggers on Oracle DBMS.
>Hence our
>> Stateless Session Beans / Data Access Objects (DAOs) would be calling
>those stored
>> procedures, which would reside on Oracle 8.1.7 (on Windows 2000). (These
>Data
>> Access Objects are running under the umbrella of a Stateless Session
>Beans). We
>> are using WebLogic's Connection Pooling.
>> Our question is: Would we get reliable rollbacks from our stored
>procedures. I
>> mean would the Transaction Management process of the EJB container
>work.
>Remember
>> the SQL is written in the Database (Oracle in this case) in the form
>of
>Stored
>> Procedures / Triggers through PL/SQL.
>> Any ideas or tips would help.
>
>
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Page scope (instance variable of servlet ), initialised in init() method of servlet if only needed by this page (servlet).
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Please check this pdfs
https://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/b00917dc-ead4-2910-3ebb-b0a63e49ef10&overridelayout=true
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select the type of bean as Stateless session bean and give the package name to store that EJB bean.
After that Expand ejb-jar.xml and then select the <projectEJB>
Double click on this on method tab double click you will get business method where we will create the methods for business logic
Double click on projectEJB and then RC on bean tab and write required business logic in bean window as follows(based on requirement we will design a business logic).
After writing the business logic go to project -> rebuild
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then go to File-->Enterprise Application Project -->create a project (projectEAR)
After creating a project click on next-> here we will have ear projects and then we select specific project required for our application.(here select projectEJB)
After that Calculate EAR project will be available on j2ee explorer.
Right click on <Bean> here
select New->Web Service->give a name to webservice and select Default configuration type as simple SOAP
-->click next -> Finish.
That webservice and related are created in ejb-jar.xml .
Expand the ejb-jar.xml.and double click on < webservice>
RC ProjectEJB -> Build EJB Archive RC on CalculateEAR ->Build applicationarchive.
Expand the projectEAR->RC on CalculateEAR.ear->Deploy to J2EE Engine
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After that go to Web dynpro perspective ->create one webdynpro Project and one component
RC on model> Select import Web Service model(last)>give model name and package
and select radio button as local file system or URL
Go to WSnavigator->copy the WSDL path and paste it in model WSDL path and click on finish.
from here onwards steps are same as that adaptive RFC model
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Thanks
Tulasi Palnati
Edited by: Tulasi Palnati on Aug 26, 2009 12:15 PM
Edited by: Tulasi Palnati on Aug 26, 2009 12:43 PM -
StreamCorruptedException from Stateless Session bean to java class
Hi all,
We have 2 servers, a ColdFusion App server which contains suns jdk 1.4.2 and websphere appserver using Ibm jdk, 1.4.2. On Server 1, we have a standalone java class which does a stateless session bean lookup and requests a service from it. On server 2(websphere), we have a stateless session bean deployed which connects to a database using a jndi lookup, executes a query and returns back a CachedRowSet object (which populates the ResultSet from the above query.) In some cases, session bean returns back an array of objects or String objects or just plain int values.
When the java class on server 1 invokes the methods returning CachedRowSet, we are getting a StreamCorruptedException, whereas on the server side, there is no exception. everything gets executed fine on websphere. This is the case only for CachedRowSet and not for other return types(as mentioned earlier the session bean returns an array of object in some cases which the java class on server 1 is successfully able to use).
This is what the piece of code look like on server 1:
// First gets a StatelessSessionBean using suns InitialContextFactory
Hashtable env = new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.cosnaming.CNCtxFactory");
env.put(Context.PROVIDER_URL,"iiop://localhost:2809");
System.out.println("Creating initial context");
Context ctx = new InitialContext(env);
System.out.println("Initial context created.");
Object homeObj = ctx.lookup("cell/nodes/localhost/servers/server1/ejb/SSBHome");
SSBHome eHome = (SSBHome)PortableRemoteObject.narrow(homeObj,SSBHome.class);
System.out.println("Got Home");
SSB eBean = eHome.create();
CachedRowSet crs = eBean.getAccts(param1, param2);
//This is the line of code which throws the exception.
The stacktrace shoows as follows:
Got Home
java.io.StreamCorruptedException
at com.sun.corba.se.internal.io.IIOPInputStream.inputRemoteMembersForReadFields(IIOPInputStream.java:1675)
at com.sun.corba.se.internal.io.IIOPInputStream.readFields(IIOPInputStream.java:1595)
at com.sun.corba.se.internal.io.InputStreamHook.readFields(InputStreamHook.java:177)
at java.math.BigInteger.readObject(BigInteger.java:3034)
at com.sun.corba.se.internal.io.IIOPInputStream.readObject(Native Method)
at com.sun.corba.se.internal.io.IIOPInputStream.invokeObjectReader(IIOPInputStream.java:1298)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObject(IIOPInputStream.java:908)
at com.sun.corba.se.internal.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:261)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:247)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1084)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:293)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:1484)
at com.sun.corba.se.internal.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:1893)
at com.sun.corba.se.internal.io.IIOPInputStream.defaultReadObjectDelegate(IIOPInputStream.java:424)
at com.sun.corba.se.internal.io.InputStreamHook.defaultReadObject(InputStreamHook.java:163)
at java.math.BigDecimal.readObject(BigDecimal.java:1084)
at com.sun.corba.se.internal.io.IIOPInputStream.readObject(Native Method)
at com.sun.corba.se.internal.io.IIOPInputStream.invokeObjectReader(IIOPInputStream.java:1298)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObjectUsingFVD(IIOPInputStream.java:1182)
at com.sun.corba.se.internal.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:259)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:247)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:948)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:289)
at com.sun.corba.se.internal.corba.TCUtility.unmarshalIn(TCUtility.java:266)
at com.sun.corba.se.internal.corba.AnyImpl.read_value(AnyImpl.java:561)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_any(CDRInputStream_1_0.java:635)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_any(CDRInputStream.java:260)
at com.sun.corba.se.internal.javax.rmi.CORBA.Util.readAny(Util.java:100)
at javax.rmi.CORBA.Util.readAny(Util.java:90)
at com.sun.corba.se.internal.io.ValueHandlerImpl.read_Array(ValueHandlerImpl.java:586)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:244)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1084)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:293)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:1577)
at com.sun.corba.se.internal.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:1796)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObject(IIOPInputStream.java:913)
at com.sun.corba.se.internal.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:261)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:247)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:948)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:289)
at com.sun.corba.se.internal.corba.TCUtility.unmarshalIn(TCUtility.java:266)
at com.sun.corba.se.internal.corba.AnyImpl.read_value(AnyImpl.java:561)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_any(CDRInputStream_1_0.java:635)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_any(CDRInputStream.java:260)
at com.sun.corba.se.internal.javax.rmi.CORBA.Util.readAny(Util.java:100)
at javax.rmi.CORBA.Util.readAny(Util.java:90)
at com.sun.corba.se.internal.io.ValueHandlerImpl.read_Array(ValueHandlerImpl.java:586)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:244)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1084)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:293)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:1577)
at com.sun.corba.se.internal.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:1796)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObject(IIOPInputStream.java:913)
at com.sun.corba.se.internal.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:261)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:247)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1084)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:293)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:1577)
at com.sun.corba.se.internal.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:1796)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObject(IIOPInputStream.java:913)
at com.sun.corba.se.internal.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:261)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:247)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1084)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:293)
at com.EJBProj._SSB_Stub.getAccts(_SSB_Stub.java:240)
at com.test.Test1.getAccts(Test1.java:101)
at com.test.Test1.<init>(Test1.java:65)
at com.test.Test1.main(Test1.java:81)
java.io.IOException: Unable to read value from underlying bridge : Serializable readObject method failed internally
at com.sun.corba.se.internal.io.IIOPInputStream.throwExceptionType(Native Method)
at com.sun.corba.se.internal.io.IIOPInputStream.defaultReadObjectDelegate(IIOPInputStream.java:446)
at com.sun.corba.se.internal.io.InputStreamHook.defaultReadObject(InputStreamHook.java:163)
at java.math.BigDecimal.readObject(BigDecimal.java:1084)
at com.sun.corba.se.internal.io.IIOPInputStream.readObject(Native Method)
at com.sun.corba.se.internal.io.IIOPInputStream.invokeObjectReader(IIOPInputStream.java:1298)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObjectUsingFVD(IIOPInputStream.java:1182)
at com.sun.corba.se.internal.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:259)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:247)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:948)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:289)
at com.sun.corba.se.internal.corba.TCUtility.unmarshalIn(TCUtility.java:266)
at com.sun.corba.se.internal.corba.AnyImpl.read_value(AnyImpl.java:561)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_any(CDRInputStream_1_0.java:635)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_any(CDRInputStream.java:260)
at com.sun.corba.se.internal.javax.rmi.CORBA.Util.readAny(Util.java:100)
at javax.rmi.CORBA.Util.readAny(Util.java:90)
at com.sun.corba.se.internal.io.ValueHandlerImpl.read_Array(ValueHandlerImpl.java:586)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:244)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1084)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:293)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:1577)
at com.sun.corba.se.internal.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:1796)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObject(IIOPInputStream.java:913)
at com.sun.corba.se.internal.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:261)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:247)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:948)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:289)
at com.sun.corba.se.internal.corba.TCUtility.unmarshalIn(TCUtility.java:266)
at com.sun.corba.se.internal.corba.AnyImpl.read_value(AnyImpl.java:561)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_any(CDRInputStream_1_0.java:635)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_any(CDRInputStream.java:260)
at com.sun.corba.se.internal.javax.rmi.CORBA.Util.readAny(Util.java:100)
at javax.rmi.CORBA.Util.readAny(Util.java:90)
at com.sun.corba.se.internal.io.ValueHandlerImpl.read_Array(ValueHandlerImpl.java:586)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:244)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1084)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:293)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:1577)
at com.sun.corba.se.internal.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:1796)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObject(IIOPInputStream.java:913)
at com.sun.corba.se.internal.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:261)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:247)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1084)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:293)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:1577)
at com.sun.corba.se.internal.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:1796)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObject(IIOPInputStream.java:913)
at com.sun.corba.se.internal.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:261)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:247)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1084)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:293)
at com.EJBProj._SSB_Stub.getAccts(_SSB_Stub.java:240)
at com.test.Test1.getAccts(Test1.java:101)
at com.test.Test1.<init>(Test1.java:65)
at com.test.Test1.main(Test1.java:81)
Again, everything seems to work fine on websphere server.
Any Clue of why this is happening?
All suggestions are greatly appreciated.
Thanks
Neorav
Message was edited by:
NeoravBSorry for the confusion!
The solution mentioned above is not the right solution.
The above given code works fine irrespective of having corbaloc in the url, if you are working in the IBMs jvm.
It fails if you are working in suns jvm.
Anyone with any idea whats missing here.
Thanks a lot for any suggestion/ideas
Neorav -
Help Connecting A Stateless Session Bean To MySQL Database
Hi, I'm trying to connect a simple stateless session bean that has been
deployed using the admin console to a MySQL database that has been
set up and pinged using the JDBC Resources/Connection Pools part of the
admin console.
When I attempt to connect to the database using the session bean I get the
following error message:
Exception in thread "main" java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
java.rmi.RemoteException: ; nested exception is:
java.sql.SQLException: No database selected
at com.sun.corba.ee.impl.javax.rmi.CORBA.Util.mapSystemException(Util.java:161)
at javax.rmi.CORBA.Util.mapSystemException(Unknown Source)
at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.invoke(StubInvocationHandlerImpl.java:142)
at com.sun.corba.ee.impl.presentation.rmi.bcel.BCELStubBase.invoke(Unknown Source)
at DBDynamicStub.testDatabase(_DB_DynamicStub.java)
at DBClient.main(DBClient.java:9)
Caused by: java.rmi.RemoteException: ; nested exception is:
java.sql.SQLException: No database selected
at com.sun.ejb.containers.InvocationHandlerUtil.throwRemoteException(InvocationHandlerUtil.java:96)
at com.sun.ejb.containers.EJBObjectInvocationHandler.invoke(EJBObjectInvocationHandler.java:141)
at $Proxy26.testDatabase(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.sun.corba.ee.impl.presentation.rmi.ReflectiveTie._invoke(ReflectiveTie.java:123)
at com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispatchToServant(CorbaServerRequestDispatcherImpl.java:648)
at com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispatch(CorbaServerRequestDispatcherImpl.java:192)
at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequestRequest(CorbaMessageMediatorImpl.java:1709)
at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:1569)
at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleInput(CorbaMessageMediatorImpl.java:951)
at com.sun.corba.ee.impl.protocol.giopmsgheaders.RequestMessage_1_2.callback(RequestMessage_1_2.java:181)
at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:721)
at com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImpl.dispatch(SocketOrChannelConnectionImpl.java:469)
at com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImpl.doWork(SocketOrChannelConnectionImpl.java:1258)
at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:409)
Caused by: java.sql.SQLException: No database selected
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2851)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1531)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1622)
at com.mysql.jdbc.Connection.execSQL(Connection.java:2379)
at com.mysql.jdbc.Connection.execSQL(Connection.java:2306)
at com.mysql.jdbc.Statement.executeQuery(Statement.java:1192)
at DBBean.testDatabase(DBBean.java:45)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.sun.enterprise.security.SecurityUtil$2.run(SecurityUtil.java:153)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.enterprise.security.application.EJBSecurityManager.doAsPrivileged(EJBSecurityManager.java:950)
at com.sun.enterprise.security.SecurityUtil.invoke(SecurityUtil.java:158)
Obviously this means that the bean can't connect to the database but I am
unsure why this is. When I set up the database using the admin console
I set the the jndi name to jdbc/test and I've tried using the following look up
code to find the database that is referenced by the JNDI name:
Context context = new javax.naming.InitialContext();
DataSource ds = (DataSource) context.lookup("jdbc/test");
and also
Context context = new javax.naming.InitialContext();
DataSource ds = (DataSource)context.lookup("java:comp/env/jdbc/test");
Neither of these methods work.
When I look at the JNDI Tree Browsing window which is available from the
admin console there is no mention of the database at all, there are four
items in the three, they are:
UserTransaction
->jdbc
->ejb
DBBean
Do I need to add a JNDI reference somewhere in order for the bean to locate
the database? I thought that when I created the database in the admin
console and specified a JNDI name this would be all that's required in order
for beans to locate the database, obviously not.
If anyone can offer any advice at all I would be very very grateful.
Ianstmt.execute("use YOUR_DATABASE_NAME");
// then your db queries.This approach works for me.
It also works to specify the database in the query like this:
InitialContext initCtx = new InitialContext();
Context envCtx = (Context) initCtx.lookup("java:comp/env");
DataSource ds = (DataSource) envCtx.lookup("jdbc/myDB");
Connection conn = ds.getConnection();
try {
Statement statement = conn.createStatement();
ResultSet rs = statement.executeQuery("select * from myDB.news");
...As you can see I added myDB. to the query.
But why is this necessary?
If I use DriverManager instead, this is NOT necessary. Like this:
Connection connection = null;
try {
Class.forName("com.mysql.jdbc.Driver");
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/myDB", "username", "password");
Statement statement = connection.createStatement();
ResultSet rs = statement.executeQuery("select * from news");
...Why do I not have to run the query statement.execute("use YOUR_DATABASE_NAME"); or specify the database name in the query statement.executeQuery("select * from myDB.news"); when I use DriverManager to obtain a Connection when I have to do that when using a DataSource?
It don't seem very efficient to have to run the extra query ( use db-name ) before I run any other query in my application. -
Transaction is not Rolling Back in Stateless Session Bean
Hi,
I am using UserTransaction in Stateless Session bean .
Transaction is not rolling back.
The following code is writen in stateless session bean. In UserTransaction i am
calling Two methods of another stateless session bean.
The problem is if doJob2() method fails, doJob1() method is rolling back. These
two methods consist of SQL statement with different Connection Object from TXDataSource.And
session bean(TestSession) is set to CMT, attribute as "Required".
try{
Context ictx=new InitialContext();
TestHome home=(TestHome)ictx.lookup("TestSession");
utx = sessionCtx.getUserTransaction();
utx.begin();
TestRemote remote=home.create();
remote.doJob1();
remote.doJob2();
utx.commit();
}catch(Exception e)
try{
utx.rollback();
}catch(Exception ex)
System.out.println("unable to rollback"+ex);
if any SQL Exception as occured in doJob2(), its calling method utx.rollback()
in catch block. but SQL statements executed thru. doJob1() are not rolling back.
what might be the reason?
thanks
Ranganath
Thanx Priscilla ,
Transaction is working.
ranganath
"Priscilla Fung" <[email protected]> wrote:
>
>In your ejb-jar.xml, you should specify <transaction-type> element to
>be "Container"
>for container-managed transaction. If you specified it to be "Bean" for
>bean-managed
>transaction, EJB ontainer will suspend the caller's transaction before
>starting
>a new transaction for your doJobX() methods. Thus, doJob1()nd doJob2()
>will be
>executing in different transactions, and thus rolling back doJob2()'s
>transaction
>will have no effect on work done and committed in doJob1()'s transaction.
>
>Regards,
>
>Priscilla
>
>
>"Ranganath" <[email protected]> wrote:
>>
>>
>>
>>I am sending config.xml,deployment descriptors, code snippet for TestSession.
>>i
>>am using weblogic6.0sp2.
>>if you need any aditional info. please let me know.
>>
>>thanks
>>ranganath
>>
>>EJB-JAR.xml
>>
>><?xml version="1.0"?>
>>
>><!DOCTYPE ejb-jar PUBLIC '-//Sun Microsystems, Inc.//DTD Enterprise
>JavaBeans
>>1.1//EN' 'http://java.sun.com/j2ee/dtds/ejb-jar_1_1.dtd'>
>>
>><ejb-jar>
>> <enterprise-beans>
>> <session>
>> <ejb-name>TestSession</ejb-name>
>> <home>com.apar.sslbridge.test.TestHome</home>
>> <remote>com.apar.sslbridge.test.TestRemote</remote>
>> <ejb-class>com.apar.sslbridge.test.TestBean</ejb-class>
>> <session-type>Stateless</session-type>
>> <transaction-type>Bean</transaction-type>
>> <resource-ref>
>> <res-ref-name>jdbc/oraclePool</res-ref-name>
>> <res-type>javax.sql.DataSource</res-type>
>> <res-auth>Container</res-auth>
>> </resource-ref>
>> </session>
>> </enterprise-beans>
>> <assembly-descriptor>
>> <container-transaction>
>> <method>
>> <ejb-name>TestSession</ejb-name>
>> <method-intf>Remote</method-intf>
>> <method-name>*</method-name>
>> </method>
>> <trans-attribute>Required</trans-attribute>
>> </container-transaction>
>> </assembly-descriptor>
>></ejb-jar>
>>
>>
>>TestSession CODE:
>>
>>
>> public void doJob1() throws RemoteException
>> {
>> Statement st = null;
>> String query=null;
>> try{
>> con=getConnection();
>> st=con.createStatement();
>> query="insert into x values("+x+++")";
>> System.out.println(query);
>> int rec=st.executeUpdate(query);
>> }catch(SQLException sqle)
>> {
>> System.out.println("SQL Exception "+sqle);
>> throw new RemoteException("RemoteException*****SQLError");
>> } catch (Exception e) {
>> System.out.println("Exception "+e);
>> throw new RemoteException("RemoteException*****GenralError");
>> }
>>}
>>
>>
>> public void doJob2()throws RemoteException
>> {
>> Connection con=null;
>> Statement st = null;
>> String query=null;
>> try{
>> con=getConnection();
>> st=con.createStatement();
>> query="insert into y values("+x+++")";
>> System.out.println(query);
>> int rec=st.executeUpdate(query);
>> }catch(SQLException sqle)
>> {
>> System.out.println("SQL Exception "+sqle);
>> throw new RemoteException("RemoteException*****SQLError");
>> } catch (Exception e) {
>> System.out.println("Exception "+e);
>> throw new RemoteException("RemoteException*****GenralError");
>>}
>>}
>>private Connection getConnection(){
>>try {
>>Connection con = StaticParams.POOL_DATASOURCE.getConnection();
>>return con;
>> } catch(Exception e) {
>> System.out.println("TestBean.getConnection() Unable to get get pool
>>connection
>>" + e);
>> }
>>}
>>
>>
>>
>>
>>"Priscilla Fung" <[email protected]> wrote:
>>>
>>>It should work if you are using TxDataSource. Could you post your
>config.xml,
>>>deployment descriptors, code snippet for TestSession?
>>>
>>>Regards,
>>>
>>>Priscilla
>>>
>>>"Ranganath" <[email protected]> wrote:
>>>>
>>>>Hi,
>>>>
>>>> I am using UserTransaction in Stateless Session bean .
>>>> Transaction is not rolling back.
>>>>
>>>>The following code is writen in stateless session bean. In UserTransaction
>>>>i am
>>>>calling Two methods of another stateless session bean.
>>>> The problem is if doJob2() method fails, doJob1() method is rolling
>>>> back. These
>>>>two methods consist of SQL statement with different Connection Object
>>>>from TXDataSource.And
>>>>session bean(TestSession) is set to CMT, attribute as "Required".
>>>>
>>>> try{
>>>> Context ictx=new InitialContext();
>>>> TestHome home=(TestHome)ictx.lookup("TestSession");
>>>> utx = sessionCtx.getUserTransaction();
>>>> utx.begin();
>>>> TestRemote remote=home.create();
>>>> remote.doJob1();
>>>> remote.doJob2();
>>>> utx.commit();
>>>> }catch(Exception e)
>>>> {
>>>> try{
>>>> utx.rollback();
>>>> }catch(Exception ex)
>>>> {
>>>> System.out.println("unable to rollback"+ex);
>>>> }
>>>> }
>>>>if any SQL Exception as occured in doJob2(), its calling method utx.rollback()
>>>>in catch block. but SQL statements executed thru. doJob1() are not
>>rolling
>>>>back.
>>>>what might be the reason?
>>>>
>>>>thanks
>>>>Ranganath
>>>
>>
>
-
Java.io in J2ee stateless session bean, general questions about debugging
Doing conventional Java IO (with java.io functions and classes such as
PrintWriter and println) in a Enterprise bean has been discussed before
in this and other forum. We know that the EJB specification says not to do it.
(For example the EJB 2.0 spec, 24.1.2) says that an enterprise
bean must not use the java.io package to attempt to access files and
directories int he file system."
The discussion in various forums including this one is that
a) using java.io in a bean would impact portability, ability to
move the bean for load balancing
b) However, this is not always an an issue and it may be reasonable
to use these functions anyway. e. g. see the response by "maozhoulu"
on Jun 21, 2002.
I tried it in Sun Application Server Nine in my stateless Session Bean:
package RS;
import RS.CourseHome;
import RS.CoursePK;
import java.rmi.RemoteException;
import javax.naming.InitialContext;
import javax.naming.Context;
import javax.rmi.PortableRemoteObject;
import javax.ejb.EJBException;
import java.io.*;
public class AddCourseBean implements javax.ejb.SessionBean {
public void ejbCreate(){};
public void CreateCourse (int CourseNumber, String CourseName) {
try {
System.out.println("in Create Course");
PrintWriter F = null;
try {
F = new PrintWriter (new FileOutputStream("/tmp/v/af"));
catch (java.io.FileNotFoundException fe){}
F.println ("here zero");F.flush();
InitialContext jndiContext = new InitialContext();
F.println ("here one");F.flush();
Object o = jndiContext.lookup("ejb/X");
...I got a Null pointer exception on the line:
"F.println("here zero"); Is there anyway one can do simple debugging with print lines in one's beans?
Or is there something obviousthat I am overlooking? (I saw mention of doing
debugging with System.out.println but to where would the bean write?)
I tried using the Jakarta Commons Logging, but I got a
java.lang.NoClassDefFoundError on org/apache/commons/logging/LogFactory
Which logging system does one use in GlassFish, hopefully one with minimal
configuration? I want to do some debugging, not set up logging for a full
enterprise system.
Thanks for your insight and advice.
Dr. Laurence Leff, Associate Professor of Computer Science WIU ST447 61455
Pager 309 367 0787, Fax 309 298 2302My apology for posting this message twice. I looked for it before and
did not see it. I thought I forget to click the "Post message" button.
Also, I did resolve one problem. System.out.println does go to
the log file, which in my case turned out to be:
/opt/j2ee/SUNWappserver/domains/domain1/logs/server.log
(Obvously, the first part would vary based upon where you installed your
Application Server Nine.)
However, it would be nice if there was some way to use FILE I/O inside of
beans. I am teaching some J2EE in the graduate software engineering course,
and I believe this would be pedagogically sound even if other techniques
would be appropriate for a production environment.
Thanks for your patience with this problem and my duplicate post. -
Some methods not working in EJB 3.0 stateless session bean
Hi,
I am trying to build an application with EJB 3.0 stateless session bean in weblogic 10. In that during build (using ant 1.6) it showing error as one of the ejb-class should have anotataion as @stateless, @stateful or @messageDiven
But i have given it corrrectly.
When I comment some of the methods the same bean is working fine. While i have annoatated some of the methods with @transaction attribute annotataion.
So, should i write all those methods there any particular order or what.
Can anybody pls tell me, what can be the problem as weblogic.appc is giving such error?Hi,
I am trying to build an application with EJB 3.0 stateless session bean in weblogic 10. In that during build (using ant 1.6) it showing error as one of the ejb-class should have anotataion as @stateless, @stateful or @messageDiven
But i have given it corrrectly.
When I comment some of the methods the same bean is working fine. While i have annoatated some of the methods with @transaction attribute annotataion.
So, should i write all those methods there any particular order or what.
Can anybody pls tell me, what can be the problem as weblogic.appc is giving such error? -
Problem Deploying EJB3 Stateless session bean in Jboss4.0.3
Hi All,
I have developed an EJB 3 Stateless session bean and tried to deploy in JBoss 4.0.3 , But i get the following Exception.
javax.naming.NameNotFoundException: ejb not bound
at org.jnp.server.NamingServer.getBinding(NamingServer.java:491)
at org.jnp.server.NamingServer.getBinding(NamingServer.java:499)
at org.jnp.server.NamingServer.getObject(NamingServer.java:505)
at org.jnp.server.NamingServer.lookup(NamingServer.java:249)
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:610)
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:572)
at javax.naming.InitialContext.lookup(InitialContext.java:351)
at org.apache.jsp.session_jsp._jspService(org.apache.jsp.session_jsp:69)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:157)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
at java.lang.Thread.run(Thread.java:595)
I am sorry if the question is silly..... My Remote Interface will be one like this
import javax.ejb.Remote;
@Remote
public interface CityService {
public String getCity();
And My Bean Class will be
import javax.ejb.EJB;
import javax.ejb.Remote;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.EntityTransaction;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
@EJB
@Remote(CityService.class)
@Stateless(mappedName="ejb/CityService")
public class CityServiceBean implements CityService {
public String getCity(){
return "Chennai Metropolitan";
And the client which invokes the bean will be
InitialContext ctx = new InitialContext();
CityService c = (CityService)ctx.lookup("ejb/CityService");
System.out.println("Msg from Bean"+c.getCity());
please help me out of this issue....
Thanks in advanceford wrote:
If you deploy your application in a .ear, you also can use this:
You have to set a name to your EJBBean -> @Stateless(name = "XXX")
The client for remote interface -> cxt.lookup(Name_of_your_own_ear_without_extension + "/XXX/Remote");
The client for local interface -> cxt.lookup(Name_of_your_own_ear_without_extension + "/XXX/Local");the problem with this approach is that if you version your ears, the version numbers show up in the jndi names, and your client code will be hard coded to specific server versions.
Maybe you are looking for
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