Hi,
I am using JBoss 3.0.6 and CMP for my tables with multi-hop realtions.
I have a many-to-may relation between a message and attribute.
But as the association between message and attribute has other fields like the sequence of the attribute in the message, i am modeling this as a one-to-many between message and message-attribute tables and another one-to-many between attribute and message-attribute tables.
But there is an unique constarint on the message-attibute table for messageid, attributeid. Essentially this means that i cannot have the same attribute in a message more than once.
In my application i need to get the 2nd attribute in a given message identified by its messageid. (This is the row in the message-attribute table with given messageid and seq_no = 2).
In my tables i have the following data:
Message table:
-------------
messageid 1
messagename msg1
Attribute table:
-----------------
attributeid 1 2
attributename attr1 attr2
message-attribute table:
--------------------
messageid 1 1
attributeid 1 2
seqno 1 2
Jboss loads all the rows from the message-attribute table with the seq_no 1.
I get the following exeption when i try to access message.getMessageAttributesWithSeq(1).getAttribute:
15:53:49,949 ERROR [LogInterceptor] TransactionRolledbackLocalException, causedB
y:
javax.ejb.EJBException: Data contains multiple values, but this cmr field is sin
gle valued
at org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCCMRFieldBridge.load(JDBCCMR
FieldBridge.java:851)
at org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCCMRFieldBridge.load(JDBCCMR
FieldBridge.java:839)
at org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCCMRFieldBridge.getInstanceV
alue(JDBCCMRFieldBridge.java:491)
at org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCCMRFieldBridge.getValue(JDB
CCMRFieldBridge.java:465)
at org.jboss.ejb.plugins.cmp.bridge.EntityBridgeInvocationHandler.invoke
(EntityBridgeInvocationHandler.java:124)
at org.jboss.proxy.compiler.Runtime.invoke(Runtime.java:59)
Any help in this regards would be greatly appreciated.
