I was scanning some older logs and found this exception in the google sql driver. It's the first time I have seen it, but it may be interesting to you:
Caused by: java.sql.SQLException: javax.resource.ResourceException: IJ000453: Unable to get managed connection for java:jboss/datasources/ef2fDS
at org.jboss.jca.adapters.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:147)
at org.hibernate.service.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:141) [hibernate-core-4.1.2.Final.jar:4.1.2.Final]
at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:278) [hibernate-core-4.1.2.Final.jar:4.1.2.Final]
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:297) [hibernate-core-4.1.2.Final.jar:4.1.2.Final]
... 84 more
Caused by: javax.resource.ResourceException: IJ000453: Unable to get managed connection for java:jboss/datasources/ef2fDS
at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.getManagedConnection(AbstractConnectionManager.java:390)
at org.jboss.jca.core.connectionmanager.tx.TxConnectionManagerImpl.getManagedConnection(TxConnectionManagerImpl.java:368)
at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.allocateConnection(AbstractConnectionManager.java:464)
at org.jboss.jca.adapters.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:139)
... 87 more
Caused by: javax.resource.ResourceException: IJ000658: Unexpected throwable while trying to create a connection: null
at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreArrayListManagedConnectionPool.getConnection(SemaphoreArrayListManagedConnectionPool.java:371)
at org.jboss.jca.core.connectionmanager.pool.AbstractPool.getSimpleConnection(AbstractPool.java:397)
at org.jboss.jca.core.connectionmanager.pool.AbstractPool.getConnection(AbstractPool.java:365)
at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.getManagedConnection(AbstractConnectionManager.java:329)
... 90 more
Caused by: javax.resource.ResourceException: Could not create connection
at org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.getLocalManagedConnection(LocalManagedConnectionFactory.java:277)
at org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.createManagedConnection(LocalManagedConnectionFactory.java:235)
at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreArrayListManagedConnectionPool.createConnectionEventListener(SemaphoreArrayListManagedConnectionPool.java:761)
at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreArrayListManagedConnectionPool.getConnection(SemaphoreArrayListManagedConnectionPool.java:343)
... 93 more
Caused by: java.sql.SQLNonTransientException: Internal error.
at com.google.cloud.sql.jdbc.internal.Exceptions.newSqlExceptionForApplicationError(Exceptions.java:185)
at com.google.cloud.sql.jdbc.internal.Exceptions.newSqlException(Exceptions.java:211)
at com.google.cloud.sql.jdbc.internal.SqlProtoClient.check(SqlProtoClient.java:158)
at com.google.cloud.sql.jdbc.internal.SqlProtoClient.openConnection(SqlProtoClient.java:60)
at com.google.cloud.sql.jdbc.Driver.connect(Driver.java:66)
at com.google.cloud.sql.Driver.connectImpl(Driver.java:109)
at com.google.cloud.sql.Driver.connect(Driver.java:98)
at com.google.cloud.sql.Driver.connect(Driver.java:31)
at org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.getLocalManagedConnection(LocalManagedConnectionFactory.java:249)
... 96 more
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