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java.util.ConcurrentModificationException Serialization trace: classes (java.net.URLClassLoader) classloader (java.security.ProtectionDomain) context (java.security.AccessControlContext) acc (org.apache.catalina.loader.WebappClassLoader) referent
java.util.ConcurrentModificationException: 	at java.util.Vector$Itr.checkForComodification(Vector.java:1184)	at java.util.Vector$Itr.next(Vector.java:1137)	at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:92)	at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:40)	at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:552)	at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:80)	at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:518)	at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:552)	at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:80)	at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:518)	at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:628)	at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:366)	at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:307)	at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:552)	at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:80)	at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:518)	at com.esotericsoftware.kryo.Kryo.writeObjectOrNull(Kryo.java:606)	at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:87)	at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:518)	at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:552)	at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:80)	at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:518)	at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:552)	at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:80)	at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:518)	at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:552)	at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:80)	at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:518)	at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:552)	at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:80)	at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:518)	at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:628)	at com.esotericsoftware.kryo.serializers.MapSerializer.write(MapSerializer.java:113)	at com.esotericsoftware.kryo.serializers.MapSerializer.write(MapSerializer.java:39)	at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:534)	at de.javakaffee.web.msm.serializer.kryo.KryoTranscoder.serializeAttributes(KryoTranscoder.java:230)	at de.javakaffee.web.msm.TranscoderService.serializeAttributes(TranscoderService.java:151)	at de.javakaffee.web.msm.BackupSessionTask.serializeAttributes(BackupSessionTask.java:180)	at de.javakaffee.web.msm.BackupSessionTask.call(BackupSessionTask.java:110)	at de.javakaffee.web.msm.BackupSessionTask.call(BackupSessionTask.java:51)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)