hi there,
i have a continuous error appearing in my JBoss AS. i'm suspecting that there is something wrong with my ds or db connections. please, if someone has a good knowledge in this, I hope to help me. the errors that i got is:
[org.jboss.resource.adapter.jdbc.vendor.OracleValidConnectionChecker] Unexpected error in

pingDatabase
java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor70.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.resource.adapter.jdbc.vendor.OracleValidConnectionChecker.isValidConnection

(OracleValidConnectionChecker.java:54)
at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnectionFactory.isValidConnection

(BaseWrapperManagedConnectionFactory.java:455)
at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnection.checkValid

(BaseWrapperManagedConnection.java:263)
at org.jboss.resource.adapter.jdbc.local.LocalManagedConnectionFactory.matchManagedConnections

(LocalManagedConnectionFactory.java:183)
at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.getConnection

(InternalManagedConnectionPool.java:166)
at org.jboss.resource.connectionmanager.JBossManagedConnectionPool$BasePool.getConnection

(JBossManagedConnectionPool.java:534)
at org.jboss.resource.connectionmanager.BaseConnectionManager2.getManagedConnection

(BaseConnectionManager2.java:396)
at org.jboss.resource.connectionmanager.TxConnectionManager.getManagedConnection(TxConnectionManager.java:299)
at org.jboss.resource.connectionmanager.BaseConnectionManager2.allocateConnection

(BaseConnectionManager2.java:448)
at org.jboss.resource.connectionmanager.BaseConnectionManager2$ConnectionManagerProxy.allocateConnection

(BaseConnectionManager2.java:838)
at org.jboss.resource.adapter.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:102)
at com.mobily.pfchange.util.DbHelper.getConnection(Unknown Source)
at com.mobily.pfchange.dao.FavNumberDAO.insertFavNoChangeFailed(Unknown Source)
at com.mobily.pfchange.helper.fav.FavDbHelper.saveRequest(Unknown Source)
at com.mobily.pfchange.action.ejb.fav.FavNumberActionBean.endProcess(Unknown Source)
at com.mobily.pfchange.action.ejb.fav.FavNumberActionBean.process(Unknown Source)
at sun.reflect.GeneratedMethodAccessor112.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.invocation.Invocation.performCall(Invocation.java:345)
at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:214)
at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke

(CachedConnectionInterceptor.java:185)
at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke

(StatelessSessionInstanceInterceptor.java:113)
at org.jboss.webservice.server.ServiceEndpointInterceptor.invoke(ServiceEndpointInterceptor.java:51)
at org.jboss.ejb.plugins.CallValidationInterceptor.invoke(CallValidationInterceptor.java:48)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:105)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:313)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:146)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:122)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:192)
at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
at org.jboss.ejb.SessionContainer.internalInvoke(SessionContainer.java:624)
at org.jboss.ejb.Container.invoke(Container.java:870)
at sun.reflect.GeneratedMethodAccessor101.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:144)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:249)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:642)
at org.jboss.invocation.local.LocalInvoker$MBeanServerAction.invoke(LocalInvoker.java:155)
at org.jboss.invocation.local.LocalInvoker.invoke(LocalInvoker.java:104)
at org.jboss.invocation.InvokerInterceptor.invokeLocal(InvokerInterceptor.java:115)
at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:101)
at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:46)
at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:55)
at org.jboss.proxy.ejb.StatelessSessionInterceptor.invoke(StatelessSessionInterceptor.java:97)
at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:91)
at $Proxy74.process(Unknown Source)
at com.mobily.pfchange.action.ejb.fav.FavNumberMDB.onMessage(Unknown Source)
at sun.reflect.GeneratedMethodAccessor109.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.invocation.Invocation.performCall(Invocation.java:345)
at org.jboss.ejb.MessageDrivenContainer$ContainerInterceptor.invoke(MessageDrivenContainer.java:475)
at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke

(CachedConnectionInterceptor.java:185)
at org.jboss.ejb.plugins.MessageDrivenInstanceInterceptor.invoke(MessageDrivenInstanceInterceptor.java:87)
at org.jboss.ejb.plugins.CallValidationInterceptor.invoke(CallValidationInterceptor.java:48)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:105)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:313)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:146)
at org.jboss.ejb.plugins.RunAsSecurityInterceptor.invoke(RunAsSecurityInterceptor.java:94)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:192)
at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
at org.jboss.ejb.MessageDrivenContainer.internalInvoke(MessageDrivenContainer.java:389)
at org.jboss.ejb.Container.invoke(Container.java:870)
at org.jboss.ejb.plugins.jms.JMSContainerInvoker.invoke(JMSContainerInvoker.java:967)
at org.jboss.ejb.plugins.jms.JMSContainerInvoker$MessageListenerImpl.onMessage(JMSContainerInvoker.java:1253)
at org.jboss.jms.asf.StdServerSession.onMessage(StdServerSession.java:256)
at org.jboss.mq.SpyMessageConsumer.sessionConsumerProcessMessage(SpyMessageConsumer.java:904)
at org.jboss.mq.SpyMessageConsumer.addMessage(SpyMessageConsumer.java:159)
at org.jboss.mq.SpySession.run(SpySession.java:351)
at org.jboss.jms.asf.StdServerSession.run(StdServerSession.java:180)
at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:748)
at java.lang.Thread.run(Thread.java:534)
Caused by: java.lang.OutOfMemoryError: unable to create new native thread
at java.lang.Thread.start(Native Method)
at oracle.jdbc.dbaccess.DBAccess.pingDatabase(DBAccess.java:1351)
at oracle.jdbc.driver.OracleConnection.pingDatabase(OracleConnection.java:2975)
... 79 more