Bira Neto [https://community.jboss.org/people/biraneto] created the discussion "Unable to load session snapshot in jbpm 5.3" To view the discussion, visit: https://community.jboss.org/message/739415#739415 -------------------------------------------------------------- I've searched the posts and found a few similar problems. I decided to post this anyway for two reasons. 1. The stack trace of the cause wasn't the same. 2. This wasn't happening on version 5.2 I am getting the error      java.lang.RuntimeException: Unable to load session snapshot with main cause Caused by: java.lang.NullPointerException      at org.drools.common.Scheduler$ActivationTimerInputMarshaller.deserialize(Scheduler.java:230)      at org.drools.marshalling.impl.ProtobufInputMarshaller.readTimer(ProtobufInputMarshaller.java:597)      at org.drools.marshalling.impl.ProtobufInputMarshaller.readSession(ProtobufInputMarshaller.java:292)      at org.drools.marshalling.impl.ProtobufInputMarshaller.readSession(ProtobufInputMarshaller.java:161)      at org.drools.marshalling.impl.ProtobufMarshaller.unmarshall(ProtobufMarshaller.java:117)      at org.drools.persistence.SessionMarshallingHelper.loadSnapshot(SessionMarshallingHelper.java:91) I'm currently using Postgres. This happens after loading a knowledge base and executing just one workflow. After that the same session can't be loaded anymore. Any ideas why this could be happening? -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/739415#739415] Start a new discussion in jBPM at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]