I am deploying a Seam 2.0 app onto WebLogic 9.2.  I have found myself getting the following exception at seemingly random times:

30 May 2008 17:47:14,441: WARN  org.hibernate.util.JDBCExceptionReporter - SQL Error: 0, SQLState: null
30 May 2008 17:47:14,441: ERROR org.hibernate.util.JDBCExceptionReporter - weblogic.common.resourcepool.ResourceDisabledException: Pool MyApp is disabled, cannot allocate resources to applications..
30 May 2008 17:47:14,441: WARN  org.hibernate.util.JDBCExceptionReporter - SQL Error: 0, SQLState: null
30 May 2008 17:47:14,441: ERROR org.hibernate.util.JDBCExceptionReporter - Cannot obtain connection: driverURL = jdbc:weblogic:pool:MyApp, props = {EmulateTwoPhaseCommit=false, connectionPoolID=MyApp, jdbcTxDataSource=true, LoggingLastResource=false, dataSourceName=MyApp}
30 May 2008 17:47:14,451: ERROR org.jboss.seam.jsf.SeamPhaseListener - uncaught exception
java.lang.IllegalStateException: Could not start transaction
     at org.jboss.seam.jsf.SeamPhaseListener.begin(SeamPhaseListener.java:571)
     at org.jboss.seam.jsf.SeamPhaseListener.handleTransactionsBeforePhase(SeamPhaseListener.java:307)
     at org.jboss.seam.jsf.SeamPhaseListener.beforeServletPhase(SeamPhaseListener.java:142)
     at org.jboss.seam.jsf.SeamPhaseListener.beforePhase(SeamPhaseListener.java:116)
     at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:222)
     at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244)
     at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:223)
     at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
     at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:283)
     at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
     at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:68)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:85)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:44)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:147)
     at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:276)
     at org.ajax4jsf.Filter.doFilter(Filter.java:175)
     at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:60)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
     at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:26)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
Caused by: javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: Cannot open connection
     at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:630)
     at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:41)
     at org.jboss.seam.transaction.EntityTransaction.begin(EntityTransaction.java:81)
     at org.jboss.seam.jsf.SeamPhaseListener.begin(SeamPhaseListener.java:566)
     at org.jboss.seam.jsf.SeamPhaseListener.handleTransactionsBeforePhase(SeamPhaseListener.java:307)
     at org.jboss.seam.jsf.SeamPhaseListener.beforeServletPhase(SeamPhaseListener.java:142)
     at org.jboss.seam.jsf.SeamPhaseListener.beforePhase(SeamPhaseListener.java:116)
     at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:222)
     at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244)
     at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:223)
     at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
     at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:283)
     at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
     at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:68)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:85)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:44)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:147)
     at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:276)
Caused by: org.hibernate.exception.GenericJDBCException: Cannot open connection
     at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)
     at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)
     at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
     at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29)
     at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:426)
     at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:144)
     at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:119)
     at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:57)
     at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1326)
     at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:38)
     at org.jboss.seam.transaction.EntityTransaction.begin(EntityTransaction.java:81)
     at org.jboss.seam.jsf.SeamPhaseListener.begin(SeamPhaseListener.java:566)
     at org.jboss.seam.jsf.SeamPhaseListener.handleTransactionsBeforePhase(SeamPhaseListener.java:307)
     at org.jboss.seam.jsf.SeamPhaseListener.beforeServletPhase(SeamPhaseListener.java:142)
     at org.jboss.seam.jsf.SeamPhaseListener.beforePhase(SeamPhaseListener.java:116)
     at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:222)
     at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244)
     at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:223)
     at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
     at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:283)
     at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
Caused by: weblogic.jdbc.extensions.PoolDisabledSQLException: weblogic.common.resourcepool.ResourceDisabledException: Pool MyApp is disabled, cannot allocate resources to applications..
     at weblogic.jdbc.common.internal.JDBCUtil.wrapAndThrowResourceException(JDBCUtil.java:242)
     at weblogic.jdbc.pool.Driver.connect(Driver.java:161)
     at weblogic.jdbc.jts.Driver.getNonTxConnection(Driver.java:647)
     at weblogic.jdbc.jts.Driver.connect(Driver.java:137)
     at weblogic.jdbc.common.internal.RmiDataSource.getConnection(RmiDataSource.java:359)
     at org.hibernate.connection.DatasourceConnectionProvider.getConnection(DatasourceConnectionProvider.java:69)
     at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:423)
     at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:144)
     at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:119)
     at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:57)
     at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1326)
     at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:38)
     at org.jboss.seam.transaction.EntityTransaction.begin(EntityTransaction.java:81)
     at org.jboss.seam.jsf.SeamPhaseListener.begin(SeamPhaseListener.java:566)
     at org.jboss.seam.jsf.SeamPhaseListener.handleTransactionsBeforePhase(SeamPhaseListener.java:307)
     at org.jboss.seam.jsf.SeamPhaseListener.beforeServletPhase(SeamPhaseListener.java:142)
     at org.jboss.seam.jsf.SeamPhaseListener.beforePhase(SeamPhaseListener.java:116)
     at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:222)
     at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244)
     at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:223)
     at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
     at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:283)
     at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
     at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:68)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:85)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)

I have verified that the datasource configured on WebLogic is working just fine.  And as I mentioned, this exception doesn't always happen.

If I can get insight into the kinds of conditions that lead to this situation where the datasource appears disabled, I would appreciate it.

Thanks.