java.sql.SQLRecoverableException: Closed Connection
===

I am using jboss7.0.2 final with Oracle 11. Currently I am facing one issue which happens randomly. But during heavy load this error trace keeps growing. Tried so many approaches couldn't succeed.

**MyDatasource Config:**
` <datasource jndi-name="sportPool" pool-name="sportPool" enabled="true" jta="true" use-java-context="true" use-ccm="true">
                    <connection-url>
                        jdbc:oracle:thin:@10.11.252.200:1521:sportsdb
                    </connection-url>
                    <driver>
                        oracleDriver
                    </driver>
                    <pool>
                        <min-pool-size>
                            1
                        </min-pool-size>
                        <max-pool-size>
                            75
                        </max-pool-size>
                        <prefill>
                            false
                        </prefill>
                        <use-strict-min>
                            false
                        </use-strict-min>
                        <flush-strategy>
                            FailingConnectionOnly
                        </flush-strategy>
                    </pool>
                    <security>
                        <user-name>
                            mportal
                        </user-name>
                        <password>
                            mobile
                        </password>
                    </security>
                    <timeout>
                        <idle-timeout-minutes>
                            60000
                        </idle-timeout-minutes>
                    </timeout>
                </datasource>
`


**StackTrace :**
nested exception is java.sql.SQLRecoverableException: Closed Connection
        at org.springframework.jdbc.support.SQLExceptionSubclassTranslator.translate(SQLExceptionSubclassTranslator.java:82)
        at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.translate(SQLErrorCodeSQLExceptionTranslator.java:237)
        at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:604)
        at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:638)
        at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:667)
        at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:683)
        at com.mportal.sport.api.subscriber.impl.SubscriberDAOImpl.getSubscriber(SubscriberDAOImpl.java:190)
        at com.mportal.sport.api.subscriber.impl.DefaultSubscriberAdapter.getSubscriber(DefaultSubscriberAdapter.java:130)
        at com.mportal.sport.api.subscriber.impl.SubscriberManager.getSubscriber(SubscriberManager.java:255)
        ... 50 more
Caused by: java.sql.SQLRecoverableException: Closed Connection
        at oracle.jdbc.driver.OracleStatement.ensureOpen(OracleStatement.java:4051)
        at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3563)
        at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3628)
        at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery(OraclePreparedStatementWrapper.java:1493)
        at org.jboss.jca.adapters.jdbc.CachedPreparedStatement.executeQuery(CachedPreparedStatement.java:111)
        at org.jboss.jca.adapters.jdbc.WrappedPreparedStatement.executeQuery(WrappedPreparedStatement.java:462)
        at org.springframework.jdbc.core.JdbcTemplate$1.doInPreparedStatement(JdbcTemplate.java:645)
        at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:588)
        ... 56 more
