I created the war file of a web application and deployed on tomcat and started the tomcat server. server is started successfully but I can see below exception in catalina.out file.

SEVERE: Exception loading sessions from persistent storage

java.io.InvalidClassException: com.vaadin.server.VaadinServletRequest; no valid constructor at java.io.ObjectStreamClass$ExceptionInfo.newInvalidClassException(ObjectStreamClass.java:169) at java.io.ObjectStreamClass.checkDeserialize(ObjectStreamClass.java:885) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2160) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1666) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2404) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2328) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2186) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1666) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:502) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:460)

Anybody has faced this issue? Your inputs/Solutions is much appreciated..