SQLServerConnectionPoolProxy implements java.io.Serializable but has a field wrappedConnection of type SQLServerConnection which itself does not implement java.io.Serializable. As a result SQLServerConnectionPoolProxy objects can not be serialized successfully.
My recommendation would be to remove the java.io.Serializable marker interface from SQLServerConnectionPoolProxy.
SQLServerConnectionPoolProxy implements
java.io.Serializablebut has a fieldwrappedConnectionof typeSQLServerConnectionwhich itself does not implementjava.io.Serializable. As a resultSQLServerConnectionPoolProxyobjects can not be serialized successfully.My recommendation would be to remove the
java.io.Serializablemarker interface fromSQLServerConnectionPoolProxy.