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Error while using RedissonSessionManager at tomcat(java.io.IOException: java.lang.ClassNotFoundException: org.springframework.webflow.conversation.impl.Conversation…

at java.io.ObjectInputStream.defaultReadFields (ObjectInputStream.java:2245) at java.io.ObjectInputStream.readSerialData (ObjectInputStream.java:2169) at java.io.ObjectInputStream.readOrdinaryObject ...
GitHub

error in CreateThumbnailModule.java IOException is never thrown

Unreported exception error IOException; it must be caught or declared to be thrown. "retriever.release()" #96 ...