[jboss-user] [Persistence, JBoss/CMP, Hibernate, Database] - "The result set is closed." error on SQL Server

[ro.dondi]

I have a problem with my application running in jboss 4.2.2. I recive randomly the following error:
java.sql.SQLException: The result set is closed.
  | 	at org.jboss.resource.adapter.jdbc.WrappedResultSet.checkState(WrappedResultSet.java:1939)
  | 	at org.jboss.resource.adapter.jdbc.WrappedResultSet.next(WrappedResultSet.java:1181)
while processing a resultset in a stateless session bean. The bean is invoked by a web layer not directly, but through a session facade. I can reproduce this error running a test application made with Selenium. This test case reproduce several time the same user navigation flow. The test case uses few stateless session bean: everyone makes a query to the db using stored procedures. The error occurs not in the same piece of code everytime, but in different db call. Every call to ejb layer is synchronized. I check that every connections is closed after the use.
Checking the connection pool i verified that only one connection is used.
Follows the datasource definition.

  <local-tx-datasource>
  |     <jndi-name>myDS</jndi-name>
  |     <connection-url>jdbc:microsoft:sqlserver://dbserver:1433;SelectMethod=cursor;DatabaseName=myDBSchema</connection-url>
  |     <driver-class>com.microsoft.jdbc.sqlserver.SQLServerDriver</driver-class>
  |     <user-name>user</user-name>
  |     <password>password</password>
  |         <!-- sql to call when connection is created
  |         <new-connection-sql>some arbitrary sql</new-connection-sql>
  |         -->
  |     <min-pool-size>1</min-pool-size>
  |     <max-pool-size>10</max-pool-size>
  |     <idle-timeout-minutes>15</idle-timeout-minutes>
  |     <blocking-timeout-millis>5000</blocking-timeout-millis>    	
  | 
  |         <!-- sql to call on an existing pooled connection when it is obtained from pool 
  |         <check-valid-connection-sql>some arbitrary sql</check-valid-connection-sql>
  |         -->
  | 
  |       <!-- corresponding type-mapping in the standardjbosscmp-jdbc.xml (optional) -->
  |       <metadata>
  |          <type-mapping>MS SQLSERVER2000</type-mapping>
  |       </metadata>
  |   </local-tx-datasource>
This error occurs using also Sql Server 2005.

Any suggestions?
Thanks

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