JBoss JDBC Data Source exception

i have configured JDBC Datasource with jboss using following configuration.

<datasources>
  <local-tx-datasource>
    <jndi-name>IMTPOOl</jndi-name>
    <connection-url>jdbc:microsoft:sqlserver://10.10.60.115:1433;DatabaseName=bjsqldb</connection-url>
    <driver-class>com.microsoft.jdbc.sqlserver.SQLServerDriver</driver-class>
      <connection-property name="auto-commit">false</connection-property>
    <user-name>dbimtquery</user-name>
    <password>dbimtquery</password>
    <min-pool-size>20</min-pool-size>
    <max-pool-size>100</max-pool-size>

      <!-- corresponding type-mapping in the standardjbosscmp-jdbc.xml (optional) -->
      <metadata>
         <type-mapping>MS SQLSERVER2000</type-mapping>
      </metadata>
  </local-tx-datasource>

</datasources>

i m facing exception "java.sql.SQLException: Already closed" while trying to close the recordset. Previously i was facing the excption while getting connection using datasource configured. Which sounds like my connection pool is fully utilized and further connections cannot be taken without releasing previous.

I have closed the connections immediately after using them but still facing the issue.

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