I'm using wildfly-8.1.0 with standalone-full-ha profile and configured a postgresql xa-datasource with driver version 9.3-1102-jdbc41, running test connection through admin console works fine also using the app that uses this datasource works fine but the log is filled with this exception every 2 minutes:

IJ000906: Error during crash recovery: java:/myApp/datasources/DS (Could not create connection)

javax.resource.ResourceException: Could not create connection

at org.jboss.jca.adapters.jdbc.xa.XAManagedConnectionFactory.getXAManagedConnection(XAManagedConnectionFactory.java:514)

at org.jboss.jca.adapters.jdbc.xa.XAManagedConnectionFactory$1.run(XAManagedConnectionFactory.java:410)

at org.jboss.jca.adapters.jdbc.xa.XAManagedConnectionFactory$1.run(XAManagedConnectionFactory.java:407)

at java.security.AccessController.doPrivileged(Native Method)

at javax.security.auth.Subject.doAs(Subject.java:422)

at org.jboss.jca.adapters.jdbc.xa.XAManagedConnectionFactory.createManagedConnection(XAManagedConnectionFactory.java:406)

at org.jboss.jca.core.tx.jbossts.XAResourceRecoveryImpl.open(XAResourceRecoveryImpl.java:343)

at org.jboss.jca.core.tx.jbossts.XAResourceRecoveryImpl.getXAResources(XAResourceRecoveryImpl.java:170)

at com.arjuna.ats.internal.jbossatx.jta.XAResourceRecoveryHelperWrapper.getXAResources(XAResourceRecoveryHelperWrapper.java:51)

at com.arjuna.ats.internal.jta.recovery.arjunacore.XARecoveryModule.resourceInitiatedRecoveryForRecoveryHelpers(XARecoveryModule.java:516)

at com.arjuna.ats.internal.jta.recovery.arjunacore.XARecoveryModule.periodicWorkFirstPass(XARecoveryModule.java:182)

at com.arjuna.ats.internal.arjuna.recovery.PeriodicRecovery.doWorkInternal(PeriodicRecovery.java:743)

at com.arjuna.ats.internal.arjuna.recovery.PeriodicRecovery.run(PeriodicRecovery.java:371)

Caused by: java.lang.IllegalStateException

at org.jboss.msc.value.InjectedValue.getValue(InjectedValue.java:47)

at org.jboss.as.connector.subsystems.datasources.AbstractDataSourceService.driverClassLoader(AbstractDataSourceService.java:246)

at org.jboss.as.connector.subsystems.datasources.AbstractDataSourceService.access$200(AbstractDataSourceService.java:93)

at org.jboss.as.connector.subsystems.datasources.AbstractDataSourceService$AS7DataSourceDeployer$1.getClassLoader(AbstractDataSourceService.java:396)

at org.jboss.jca.adapters.jdbc.xa.XAManagedConnectionFactory.getXADataSource(XAManagedConnectionFactory.java:634)

at org.jboss.jca.adapters.jdbc.xa.XAManagedConnectionFactory.getXAManagedConnection(XAManagedConnectionFactory.java:497)

... 12 more