Relationship mapping problem
Hello,
I tried the relationship mapping of CMP2.0 and I just can't get it working. I have a table for all countries of the world, with an primary key Land_Id. Then I have a table with adresses. This table has a field Land_Id for specifiying one country for each adress. I wanted jBoss 3.0 alpha to map that relationship. I have two entity beans, one for the adresses, one for the countries. I added the following methods in the entity bean for the adress:
public abstract Land getLand();
public abstract void setLand(Land aLand);
And in the entity bean for the country:
public abstract Collection getAdressen();
public abstract void setAdressen(Collection Adressen);
I didn't declared the Land-field in the ejb-jar.xml for the adress entity bean, because that didn't seem to be the right thing. Then I added the relationships to my ejb-jar.xml:
<ejb-relation>
<ejb-relation-name>Adresse-Land</ejb-relation-name>
<ejb-relationship-role>
<ejb-relationship-role-name>land-hat-adressen</ejb-relationship-role-name>
One
<relationship-role-source>
<ejb-name>intrablue_Land</ejb-name>
</relationship-role-source>
<cmr-field>
<cmr-field-name>Adressen</cmr-field-name>
<cmr-field-type>java.util.Collection</cmr-field-type>
</cmr-field>
</ejb-relationship-role>
<ejb-relationship-role>
<ejb-relationship-role-name>adressen-haben-land</ejb-relationship-role-name>
Many
<relationship-role-source>
<ejb-name>intrablue_Adresse</ejb-name>
</relationship-role-source>
<cmr-field>
<cmr-field-name>Land</cmr-field-name>
</cmr-field>
</ejb-relationship-role>
</ejb-relation>
and to the jbosscmp-jdbc.xml:
<ejb-relation>
<ejb-relation-name>Adresse-Land</ejb-relation-name>
<foreign-key-mapping>
<ejb-relationship-role>
<ejb-relationship-role-name>land-hat-adressen</ejb-relationship-role-name>
<fk-constraint>false</fk-constraint>
<foreign-key-fields/>
</ejb-relationship-role>
<ejb-relationship-role>
<ejb-relationship-role-name>adressen-haben-land</ejb-relationship-role-name>
<fk-constraint>false</fk-constraint>
<foreign-key-fields>
<foreign-key-field>
<field-name>Land_Id</field-name>
<column-name>Land_Id</column-name>
</foreign-key-field>
</foreign-key-fields>
</ejb-relationship-role>
</foreign-key-mapping>
</ejb-relation>
But everytime I try to use getLand() from the client now, it doesn't work! I just get an null pointer exception like this:
[10:28:43,706,Default] java.lang.NullPointerException
[10:28:43,706,Default] at org.jboss.ejb.plugins.local.BaseLocalContainerInvoker
.getEntityEJBLocalObject(BaseLocalContainerInvoker.java:226)
[10:28:43,716,Default] at org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCCMRFieldBri
dge.getValue(JDBCCMRFieldBridge.java:399)
[10:28:43,716,Default] at org.jboss.ejb.plugins.cmp.bridge.EntityBridgeInvocati
onHandler.invoke(EntityBridgeInvocationHandler.java:111)
[10:28:43,716,Default] at org.jboss.proxy.ProxyCompiler$Runtime.invoke(ProxyCom
piler.java:89)
[10:28:43,726,Default] at server.adressen.adresse.AdresseBean$Proxy.getLand(Unk
nown Source)
[10:28:43,726,Default] at java.lang.reflect.Method.invoke(Native Method)
[10:28:43,726,Default] at org.jboss.ejb.EntityContainer$ContainerInterceptor.in
voke(EntityContainer.java:1002)
[10:28:43,726,Default] at org.jboss.ejb.plugins.cmp.jdbc.JDBCReadAheadIntercept
or.invoke(JDBCReadAheadInterceptor.java:100)
[10:28:43,736,Default] at org.jboss.ejb.plugins.cmp.jdbc.JDBCRelationIntercepto
r.invoke(JDBCRelationInterceptor.java:134)
[10:28:43,736,Default] at org.jboss.ejb.plugins.EntitySynchronizationIntercepto
r.invoke(EntitySynchronizationInterceptor.java:308)
[10:28:43,736,Default] at org.jboss.ejb.plugins.EntityInstanceInterceptor.invok
e(EntityInstanceInterceptor.java:201)
[10:28:43,746,Default] at org.jboss.ejb.plugins.EntityLockInterceptor.invoke(En
tityLockInterceptor.java:132)
[10:28:43,746,Default] at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNex
t(AbstractTxInterceptor.java:98)
[10:28:43,756,Default] at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransac
tions(TxInterceptorCMT.java:156)
[10:28:43,756,Default] at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInter
ceptorCMT.java:65)
[10:28:43,756,Default] at org.jboss.ejb.plugins.SecurityInterceptor.invoke(Secu
rityInterceptor.java:131)
[10:28:43,756,Default] at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterc
eptor.java:166)
[10:28:43,766,Default] at org.jboss.ejb.EntityContainer.invoke(EntityContainer.
java:447)
[10:28:43,766,Default] at org.jboss.ejb.Container.invoke(Container.java:528)
[10:28:43,766,Default] at com.sun.management.jmx.MBeanServerImpl.invoke(MBeanSe
rverImpl.java:1555)
[10:28:43,776,Default] at com.sun.management.jmx.MBeanServerImpl.invoke(MBeanSe
rverImpl.java:1523)
[10:28:43,776,Default] at org.jboss.ejb.plugins.jrmp.server.JRMPContainerInvoke
r.invoke(JRMPContainerInvoker.java:411)
[10:28:43,776,Default] at java.lang.reflect.Method.invoke(Native Method)
[10:28:43,786,Default] at sun.rmi.server.UnicastServerRef.dispatch(UnicastServe
rRef.java:241)
[10:28:43,786,Default] at sun.rmi.transport.Transport$1.run(Transport.java:152)
[10:28:43,786,Default] at java.security.AccessController.doPrivileged(Native Me
thod)
[10:28:43,786,Default] at sun.rmi.transport.Transport.serviceCall(Transport.jav
a:148)
[10:28:43,796,Default] at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCP
Transport.java:465)
[10:28:43,796,Default] at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.
run(TCPTransport.java:706)
[10:28:43,796,Default] at java.lang.Thread.run(Thread.java:484)
[10:28:43,806,EntityContainer] invoke returned an exception
java.rmi.ServerException: null
Embedded Exception
null; nested exception is:
javax.ejb.EJBException: null
Embedded Exception
null
javax.ejb.EJBException: null
Embedded Exception
null
at org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCCMRFieldBridge.getValue(JDB
CCMRFieldBridge.java:404)
at org.jboss.ejb.plugins.cmp.bridge.EntityBridgeInvocationHandler.invoke
(EntityBridgeInvocationHandler.java:111)
at org.jboss.proxy.ProxyCompiler$Runtime.invoke(ProxyCompiler.java:89)
at server.adressen.adresse.AdresseBean$Proxy.getLand(Unknown Source)
at java.lang.reflect.Method.invoke(Native Method)
at org.jboss.ejb.EntityContainer$ContainerInterceptor.invoke(EntityConta
iner.java:1002)
at org.jboss.ejb.plugins.cmp.jdbc.JDBCReadAheadInterceptor.invoke(JDBCRe
adAheadInterceptor.java:100)
at org.jboss.ejb.plugins.cmp.jdbc.JDBCRelationInterceptor.invoke(JDBCRel
ationInterceptor.java:134)
at org.jboss.ejb.plugins.EntitySynchronizationInterceptor.invoke(EntityS
ynchronizationInterceptor.java:308)
at org.jboss.ejb.plugins.EntityInstanceInterceptor.invoke(EntityInstance
Interceptor.java:201)
at org.jboss.ejb.plugins.EntityLockInterceptor.invoke(EntityLockIntercep
tor.java:132)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInte
rceptor.java:98)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxIntercep
torCMT.java:156)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:6
5)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.
java:131)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:166)
at org.jboss.ejb.EntityContainer.invoke(EntityContainer.java:447)
at org.jboss.ejb.Container.invoke(Container.java:528)
at com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:15
55)
at com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:15
23)
at org.jboss.ejb.plugins.jrmp.server.JRMPContainerInvoker.invoke(JRMPCon
tainerInvoker.java:411)
at java.lang.reflect.Method.invoke(Native Method)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:241)
at sun.rmi.transport.Transport$1.run(Transport.java:152)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:148)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:4
65)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport
.java:706)
at java.lang.Thread.run(Thread.java:484)
java.lang.NullPointerException
at org.jboss.ejb.plugins.local.BaseLocalContainerInvoker.getEntityEJBLoc
alObject(BaseLocalContainerInvoker.java:226)
at org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCCMRFieldBridge.getValue(JDB
CCMRFieldBridge.java:399)
at org.jboss.ejb.plugins.cmp.bridge.EntityBridgeInvocationHandler.invoke
(EntityBridgeInvocationHandler.java:111)
at org.jboss.proxy.ProxyCompiler$Runtime.invoke(ProxyCompiler.java:89)
at server.adressen.adresse.AdresseBean$Proxy.getLand(Unknown Source)
at java.lang.reflect.Method.invoke(Native Method)
at org.jboss.ejb.EntityContainer$ContainerInterceptor.invoke(EntityConta
iner.java:1002)
at org.jboss.ejb.plugins.cmp.jdbc.JDBCReadAheadInterceptor.invoke(JDBCRe
adAheadInterceptor.java:100)
at org.jboss.ejb.plugins.cmp.jdbc.JDBCRelationInterceptor.invoke(JDBCRel
ationInterceptor.java:134)
at org.jboss.ejb.plugins.EntitySynchronizationInterceptor.invoke(EntityS
ynchronizationInterceptor.java:308)
at org.jboss.ejb.plugins.EntityInstanceInterceptor.invoke(EntityInstance
Interceptor.java:201)
at org.jboss.ejb.plugins.EntityLockInterceptor.invoke(EntityLockIntercep
tor.java:132)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInte
rceptor.java:98)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxIntercep
torCMT.java:156)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:6
5)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.
java:131)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:166)
at org.jboss.ejb.EntityContainer.invoke(EntityContainer.java:447)
at org.jboss.ejb.Container.invoke(Container.java:528)
at com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:15
55)
at com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:15
23)
at org.jboss.ejb.plugins.jrmp.server.JRMPContainerInvoker.invoke(JRMPCon
tainerInvoker.java:411)
at java.lang.reflect.Method.invoke(Native Method)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:241)
at sun.rmi.transport.Transport$1.run(Transport.java:152)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:148)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:4
65)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport
.java:706)
at java.lang.Thread.run(Thread.java:484)
What's wrong with the relationship mapping in my example ?
Thanks in advance!
Regards,
Ralf
