Lookup a MySQL Datasource with a EntityBean EJB with jboss

Question

Hy all,
For a few days, i have problems to instance a datasource from my Entitybean
EJB
jboss release is 3.2.2 , MySQL 3.23.38
i use mysql-connector-java-3.0.9-stable-bin.jar for jdbc connectivity
Here is the source of my datasource mysql-ds.xml
<datasources>
<local-tx-datasource>
<jndi-name>MySQLmydbDS</jndi-name>
<connection-url>jdbc:mysql://localhost:3306/mydb</connection-url>
<driver-class>org.gjt.mm.mysql.Driver</driver-class>
<user-name>mylogin</user-name>
<password>mypass</password>
</local-tx-datasource>
</datasources>
The datasource is deployed in jboss cause i see the ligne as followed in the
administration console
http://localhost:8080/jmx-console
a.. name=MySQLmydbDS,service=LocalTxCM
a.. name=MySQLmydbDS,service=ManagedConnectionFactory
a.. name=MySQLmydbDS,service=ManagedConnectionPool
My EJB deploy without problems when i put the jar in the deploy directory
Here is the part of the source of my EJB causing Exception
public void setEntityContext(EntityContext context) {
this.context = context;
try {
InitialContext ic = new InitialContext();
DataSource ds = (DataSource) ic.lookup("java:comp/env/jdbc/ClientDB");
/* ----> ERROR */
connexionBD = ds.getConnection();
catch (Exception e) {
throw new EJBException("Connexion � la base de donn�es impossible : "
+ e.getMessage());
Here my ejb-jar.xml
<ejb-jar>
<description>Descripteur de d�ploiement pour l'EJB client</description>
<display-name>EJB Client</display-name>
<enterprise-beans>
<entity>
<description>EJB Client ( BMP )</description>
<ejb-name>Client</ejb-name>
<home>com.foobar.ejbs.ClientHome</home>
<remote>com.foobar.ejbs.Client</remote>
<ejb-class>com.foobar.ejbs.ClientBean</ejb-class>
<persistence-type>Bean</persistence-type>
<prim-key-class>java.lang.String</prim-key-class>
<reentrant>False</reentrant>
<resource-ref>
<res-ref-name>jdbc/ClientDB</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
</entity>
</enterprise-beans>
<assembly-descriptor>
<container-transaction>
<method>
<ejb-name>Client</ejb-name>
<method-name>*</method-name>
</method>
<trans-attribute>Required</trans-attribute>
</container-transaction>
</assembly-descriptor>
</ejb-jar>
And finally the jboss.xml
<jboss>
<enterprise-beans>
<entity>
<ejb-name>Client</ejb-name>
<jndi-name>ejb/Client</jndi-name>
<resource-ref>
<res-ref-name>jdbc/ClientDB</res-ref-name>
<jndi-name>MySQLmydbDS</jndi-name>
</resource-ref>
</entity>
</enterprise-beans>
</jboss>
The error message when i execute my client :
java.rmi.ServerException : RemoteException occured in server Thread; nested
exception is :
java.rmi.ServerException: EJBException:; nested exception is :
javax.ejb.EJBException: Connexion � la base de donn�e impossible : Could not
dereference object
Thanks in advance if you've already seen this problem.
Antoine

Answer 1

I uses MSSQLERVER 2000,<res-ref-name>jdbc/MSSQLDS</res-ref-name>
<jndi-name>java:/java:/MSSQLDS</jndi-name>
but DataSource ds = (DataSource) ic.lookup("java:comp/env/jdbc/MSSQLDS")cann't be execute throwing execption:
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
     java.rmi.ServerException: RuntimeException; nested exception is:
     java.lang.NullPointerException
     at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:292)
     at sun.rmi.transport.Transport$1.run(Transport.java:148)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
     at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
     at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
     at java.lang.Thread.run(Thread.java:534)
     at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:247)
     at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
     at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:133)
     at org.jboss.invocation.jrmp.server.JRMPInvoker_Stub.invoke(Unknown Source)
     at org.jboss.invocation.jrmp.interfaces.JRMPInvokerProxy.invoke(JRMPInvokerProxy.java:135)
     at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:96)
     at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:46)
     at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:45)
     at org.jboss.proxy.ejb.StatelessSessionInterceptor.invoke(StatelessSessionInterceptor.java:100)
     at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:85)
     at $Proxy1.loginUser(Unknown Source)
     at au.com.tusc.client.SessionBMPClient.testBean(SessionBMPClient.java:55)
     at au.com.tusc.client.SessionBMPClient.main(SessionBMPClient.java:77)
Caused by: java.rmi.ServerException: RuntimeException; nested exception is:
     java.lang.NullPointerException
     at org.jboss.ejb.plugins.LogInterceptor.handleException(LogInterceptor.java:361)
     at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:195)
     at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
     at org.jboss.ejb.StatelessSessionContainer.internalInvoke(StatelessSessionContainer.java:331)
     at org.jboss.ejb.Container.invoke(Container.java:700)
     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:324)
     at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
     at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
     at org.jboss.invocation.jrmp.server.JRMPInvoker.invoke(JRMPInvoker.java:367)
     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:324)
     at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:261)
     at sun.rmi.transport.Transport$1.run(Transport.java:148)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
     at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
     at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
     at java.lang.Thread.run(Thread.java:534)
Caused by: java.lang.NullPointerException
     at au.com.tusc.dao.StoreAccessDAOImpl.loginUser(StoreAccessDAOImpl.java:82)
     at au.com.tusc.session.StoreAccessSession.loginUser(StoreAccessSession.java:60)
     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:324)
     at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:683)
     at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:185)
     at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:72)
     at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:84)
     at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:267)
     at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:128)
     at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:118)
     at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:191)
     ... 21 more
you said:"Also, when you get a change I believe it recommended that the name and password are placed in the login-config.xml ".
How where to set up name and password in the login-config.xml .
additionally,i uses jboss3.2.3,on the jmx-console management,i cann't find "jboss;service=Hypersonic SQL",why?