Timers do not recover after database disconnection

Setup RHPAM with an oracle database from docker, with recovery setup.

```
<validation>
<validate-on-match>true</validate-on-match>
<valid-connection-checker class-name="org.jboss.jca.adapters.jdbc.extensions.oracle.OracleValidConnectionChecker"></valid-connection-checker>
<stale-connection-checker class-name="org.jboss.jca.adapters.jdbc.extensions.oracle.OracleStaleConnectionChecker"></stale-connection-checker>
<exception-sorter class-name="org.jboss.jca.adapters.jdbc.extensions.oracle.OracleExceptionSorter"></exception-sorter>
</validation>

```

After run oracle database

docker run -d -p 8090:8080 -p 1521:1521 -v /home/alberto/redhat/databases/oracle12c:/u01/app/oracle oracle-12c

and start RHPAM (with the timer project uploaded)

./standalone.sh -c standalone-full.xml

I start to see the messages from timer:

```
14:06:52,266 INFO [stdout] (EJB default - 5) Triggered timer ...
14:06:53,262 INFO [stdout] (EJB default - 6) Triggered timer ...
14:06:54,257 INFO [stdout] (EJB default - 7) Triggered timer ...
```

Then when stopped the database:

docker stop container_name

I can see error inspecting process instances (see screenshot attached)

and an error in log for timer

```
14:07:12,362 WARN [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] (EJB default - 5) SQL Error: 0, SQLState: null
14:07:12,362 ERROR [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] (EJB default - 5) javax.resource.ResourceException: IJ000453: Unable to get managed connection for java:jboss/datasources/OracleDS
14:07:12,363 INFO [org.hibernate.event.internal.DefaultLoadEventListener] (EJB default - 5) HHH000327: Error performing load command : org.hibernate.exception.GenericJDBCException: Unable to acquire JDBC Connection
14:07:12,364 WARN [org.drools.persistence.PersistableRunner] (EJB default - 5) Could not commit session: org.drools.persistence.api.SessionNotFoundException: Could not find session data for id 1
at org.drools.persistence.PersistableRunner.initExistingKnowledgeSession(PersistableRunner.java:231)
at org.drools.persistence.PersistableRunner$TransactionInterceptor.execute(PersistableRunner.java:588)
at org.drools.persistence.PersistableRunner$TransactionInterceptor.execute(PersistableRunner.java:563)
at org.drools.core.command.impl.AbstractInterceptor.executeNext(AbstractInterceptor.java:39)
at org.drools.persistence.jpa.OptimisticLockRetryInterceptor.internalExecute(OptimisticLockRetryInterceptor.java:102)
at org.drools.persistence.jpa.OptimisticLockRetryInterceptor.execute(OptimisticLockRetryInterceptor.java:83)
at org.drools.persistence.jpa.OptimisticLockRetryInterceptor.execute(OptimisticLockRetryInterceptor.java:44)
at org.drools.core.command.impl.AbstractInterceptor.executeNext(AbstractInterceptor.java:39)
at org.drools.persistence.jta.TransactionLockInterceptor.execute(TransactionLockInterceptor.java:73)
at org.drools.persistence.jta.TransactionLockInterceptor.execute(TransactionLockInterceptor.java:45)
at org.drools.core.command.impl.AbstractInterceptor.executeNext(AbstractInterceptor.java:39)
at org.jbpm.runtime.manager.impl.error.ExecutionErrorHandlerInterceptor.internalExecute(ExecutionErrorHandlerInterceptor.java:66)
at org.jbpm.runtime.manager.impl.error.ExecutionErrorHandlerInterceptor.execute(ExecutionErrorHandlerInterceptor.java:52)
at org.jbpm.runtime.manager.impl.error.ExecutionErrorHandlerInterceptor.execute(ExecutionErrorHandlerInterceptor.java:29)
at org.drools.persistence.PersistableRunner.execute(PersistableRunner.java:398)
at org.drools.persistence.PersistableRunner.execute(PersistableRunner.java:66)
at org.drools.core.runtime.InternalLocalRunner.execute(InternalLocalRunner.java:37)
at org.drools.core.runtime.InternalLocalRunner.execute(InternalLocalRunner.java:35)
at org.jbpm.process.core.timer.impl.GlobalTimerService$DisposableCommandService.execute(GlobalTimerService.java:346)
at org.jbpm.process.core.timer.impl.GlobalTimerService$DisposableCommandService.execute(GlobalTimerService.java:323)
at org.drools.core.runtime.InternalLocalRunner.execute(InternalLocalRunner.java:37)
at org.drools.core.runtime.InternalLocalRunner.execute(InternalLocalRunner.java:41)
at org.jbpm.persistence.timer.GlobalJpaTimerJobInstance.call(GlobalJpaTimerJobInstance.java:82)
at org.jbpm.persistence.timer.GlobalJpaTimerJobInstance.call(GlobalJpaTimerJobInstance.java:49)
at org.jbpm.services.ejb.timer.EJBTimerScheduler.executeTimerJob(EJBTimerScheduler.java:91)
at sun.reflect.GeneratedMethodAccessor80.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.jboss.as.ee.component.ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptor.java:52)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:50)
at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:61)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:509)
at org.jboss.as.weld.interceptors.Jsr299BindingsInterceptor.doMethodInterception(Jsr299BindingsInterceptor.java:90)
at org.jboss.as.weld.interceptors.Jsr299BindingsInterceptor.processInvocation(Jsr299BindingsInterceptor.java:103)
at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:61)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:50)
at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:61)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ejb3.component.invocationmetrics.ExecutionTimeInterceptor.processInvocation(ExecutionTimeInterceptor.java:43)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ee.concurrent.ConcurrentContextInterceptor.processInvocation(ConcurrentContextInterceptor.java:45)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.invocation.InitialInterceptor.processInvocation(InitialInterceptor.java:40)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:53)
at org.jboss.as.ee.component.interceptors.ComponentDispatcherInterceptor.processInvocation(ComponentDispatcherInterceptor.java:52)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ejb3.component.singleton.SingletonComponentInstanceAssociationInterceptor.processInvocation(SingletonComponentInstanceAssociationInterceptor.java:53)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ejb3.component.interceptors.AdditionalSetupInterceptor.processInvocation(AdditionalSetupInterceptor.java:54)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:237)
at org.jboss.as.ejb3.tx.CMTTxInterceptor.required(CMTTxInterceptor.java:362)
at org.jboss.as.ejb3.tx.CMTTxInterceptor.processInvocation(CMTTxInterceptor.java:144)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:509)
at org.jboss.weld.module.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:81)
at org.jboss.as.weld.ejb.EjbRequestScopeActivationInterceptor.processInvocation(EjbRequestScopeActivationInterceptor.java:89)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ejb3.security.SecurityContextInterceptor.processInvocation(SecurityContextInterceptor.java:100)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:509)
at org.jboss.as.ejb3.component.singleton.ContainerManagedConcurrencyInterceptor.processInvocation(ContainerManagedConcurrencyInterceptor.java:106)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ejb3.component.interceptors.ShutDownInterceptorFactory$1.processInvocation(ShutDownInterceptorFactory.java:64)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.invocation.ContextClassLoaderInterceptor.processInvocation(ContextClassLoaderInterceptor.java:60)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.invocation.InterceptorContext.run(InterceptorContext.java:438)
at org.wildfly.security.manager.WildFlySecurityManager.doChecked(WildFlySecurityManager.java:619)
at org.jboss.invocation.AccessCheckingInterceptor.processInvocation(AccessCheckingInterceptor.java:57)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:53)
at org.jboss.as.ejb3.timerservice.TimedObjectInvokerImpl.callTimeout(TimedObjectInvokerImpl.java:99)
at org.jboss.as.ejb3.timerservice.TimedObjectInvokerImpl.callTimeout(TimedObjectInvokerImpl.java:109)
at org.jboss.as.ejb3.timerservice.TimerTask.invokeBeanMethod(TimerTask.java:189)
at org.jboss.as.ejb3.timerservice.TimerTask.callTimeout(TimerTask.java:185)
at org.jboss.as.ejb3.timerservice.TimerTask.retryTimeout(TimerTask.java:230)
at org.jboss.as.ejb3.timerservice.TimerTask.run(TimerTask.java:164)
at org.jboss.as.ejb3.timerservice.TimerServiceImpl$Task$1.run(TimerServiceImpl.java:1299)
at org.wildfly.extension.requestcontroller.RequestController$QueuedTask$1.run(RequestController.java:494)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
at org.jboss.threads.JBossThread.run(JBossThread.java:485)
Caused by: javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: Unable to acquire JDBC Connection
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:154)
at org.hibernate.internal.SessionImpl.find(SessionImpl.java:3512)
at org.hibernate.internal.SessionImpl.find(SessionImpl.java:3447)
at org.drools.persistence.jpa.JpaPersistenceContext.findSession(JpaPersistenceContext.java:79)
at org.drools.persistence.PersistableRunner.initExistingKnowledgeSession(PersistableRunner.java:229)
... 91 more
Caused by: org.hibernate.exception.GenericJDBCException: Unable to acquire JDBC Connection
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:47)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:113)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:99)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.acquireConnectionIfNeeded(LogicalConnectionManagedImpl.java:109)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.getPhysicalConnection(LogicalConnectionManagedImpl.java:136)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.connection(StatementPreparerImpl.java:47)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$5.doPrepare(StatementPreparerImpl.java:146)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:172)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:148)
at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.prepareQueryStatement(AbstractLoadPlanBasedLoader.java:226)
at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeQueryStatement(AbstractLoadPlanBasedLoader.java:190)
at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:121)
at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:86)
at org.hibernate.loader.entity.plan.AbstractLoadPlanBasedEntityLoader.load(AbstractLoadPlanBasedEntityLoader.java:188)
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:4269)
at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:511)
at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:481)
at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:222)
at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:281)
at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:124)
at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:92)
at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1257)
at org.hibernate.internal.SessionImpl.access$1900(SessionImpl.java:207)
at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.doLoad(SessionImpl.java:2874)
at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.load(SessionImpl.java:2848)
at org.hibernate.internal.SessionImpl.find(SessionImpl.java:3483)
... 94 more
Caused by: java.sql.SQLException: javax.resource.ResourceException: IJ000453: Unable to get managed connection for java:jboss/datasources/OracleDS
at org.jboss.jca.adapters.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:146)
at org.jboss.as.connector.subsystems.datasources.WildFlyDataSource.getConnection(WildFlyDataSource.java:64)
at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122)
at org.hibernate.internal.NonContextualJdbcConnectionAccess.obtainConnection(NonContextualJdbcConnectionAccess.java:35)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.acquireConnectionIfNeeded(LogicalConnectionManagedImpl.java:106)
... 116 more
Caused by: javax.resource.ResourceException: IJ000453: Unable to get managed connection for java:jboss/datasources/OracleDS
at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.getManagedConnection(AbstractConnectionManager.java:690)
at org.jboss.jca.core.connectionmanager.tx.TxConnectionManagerImpl.getManagedConnection(TxConnectionManagerImpl.java:440)
at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.allocateConnection(AbstractConnectionManager.java:789)
at org.jboss.jca.adapters.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:138)
... 120 more
Caused by: javax.resource.ResourceException: IJ031084: Unable to create connection
at org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.createLocalManagedConnection(LocalManagedConnectionFactory.java:345)
at org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.getLocalManagedConnection(LocalManagedConnectionFactory.java:352)
at org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.createManagedConnection(LocalManagedConnectionFactory.java:287)
at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreConcurrentLinkedDequeManagedConnectionPool.createConnectionEventListener(SemaphoreConcurrentLinkedDequeManagedConnectionPool.java:1326)
at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreConcurrentLinkedDequeManagedConnectionPool.getConnection(SemaphoreConcurrentLinkedDequeManagedConnectionPool.java:499)
at org.jboss.jca.core.connectionmanager.pool.AbstractPool.getTransactionNewConnection(AbstractPool.java:714)
at org.jboss.jca.core.connectionmanager.pool.AbstractPool.getConnection(AbstractPool.java:613)
at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.getManagedConnection(AbstractConnectionManager.java:624)
... 123 more
Caused by: java.sql.SQLException: Listener refused the connection with the following error:
ORA-12528, TNS:listener: all appropriate instances are blocking new connections

at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:774)
at oracle.jdbc.driver.PhysicalConnection.connect(PhysicalConnection.java:688)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:39)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:691)
at org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.createLocalManagedConnection(LocalManagedConnectionFactory.java:321)
... 130 more
Caused by: oracle.net.ns.NetException: Listener refused the connection with the following error:
ORA-12528, TNS:listener: all appropriate instances are blocking new connections

at oracle.net.ns.NSProtocolNIO.negotiateConnection(NSProtocolNIO.java:271)
at oracle.net.ns.NSProtocol.connect(NSProtocol.java:317)
at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1438)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:518)
... 134 more
```

After restart the database, process instances are readed again without need to relogin, but timer do not start again.