DefaultTreeMode Serialization Problem

[ymnrad]

I am trying to implement ViewList Facelet and I am using Primefaces v8.0 TreeNode.
The DefaultTreeNode should be serialized with Kryo and saved in Redis and De-Serializedwith Kryo. It seems Kryo couldnt serializethe DkBaum Object since it contains DefaultTreeNode. The thing I couldnt understand, is that the DefaultTreeMode is Serializable.

The Bib we use:

1. Tomcat 7
2. Kryo Serializer 0.45
3. memcached session manager 2.3.2
4. Redis
5. Primefaces 8
   ...

Any help is appreciated. Thanks allot in advance.
...

Serialization trace:
children (org.primefaces.model.DefaultTreeNode)
rootTreeNode (*****.******.*****.BaumView)
instance (org.jboss.weld.contexts.SerializableContextualInstanceImpl)
        at de.javakaffee.web.msm.serializer.kryo.KryoTranscoder.deserializeAttributes(KryoTranscoder.java:217)
        at de.javakaffee.web.msm.TranscoderService.deserializeAttributes(TranscoderService.java:167)
        at de.javakaffee.web.msm.TranscoderService.deserialize(TranscoderService.java:124)
        at de.javakaffee.web.msm.MemcachedSessionService.loadFromMemcached(MemcachedSessionService.java:1155)
        at de.javakaffee.web.msm.MemcachedSessionService.findSession(MemcachedSessionService.java:605)
        at de.javakaffee.web.msm.MemcachedBackupSessionManager.findSession(MemcachedBackupSessionManager.java:218)
        at org.apache.catalina.ha.tcp.ReplicationValve.createPrimaryIndicator(ReplicationValve.java:615)
        at org.apache.catalina.ha.tcp.ReplicationValve.invoke(ReplicationValve.java:320)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)
        at org.apache.coyote.ajp.AjpAprProcessor.process(AjpAprProcessor.java:188)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
        at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2555)
        at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2544)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:748)
Caused by: com.esotericsoftware.kryo.KryoException: java.lang.NullPointerException
Serialization trace:
children (org.primefaces.model.DefaultTreeNode)
rootTreeNode (****.*****.*****BaumView)
instance (org.jboss.weld.contexts.SerializableContextualInstanceImpl)
        at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:144)
        at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:543)
        at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:731)
        at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:125)
        at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:543)
        at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:731)
        at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:125)
        at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:543)
        at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:813)
        at com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:161)
        at com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:39)
        at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:709)
        at de.javakaffee.web.msm.serializer.kryo.KryoTranscoder.deserializeAttributes(KryoTranscoder.java:215)
        ... 16 more
Caused by: java.lang.NullPointerException
        at java.util.ArrayList.ensureExplicitCapacity(ArrayList.java:240)
        at java.util.ArrayList.ensureCapacity(ArrayList.java:221)
        at com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:114)
        at com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:40)
        at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:731)
        at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:125)
        ... 28 more````




```@Named("bview")
@SessionScoped
public class BaumView implements Serializable {

	/**
	 * 
	 */
	private static final long serialVersionUID = 2912669851825948112L;

	private DefaultTreeNode rootTreeNode;

	private Map<String, Serializable> dkMapSlim;
	private DefaultTreeNode selectedNode;
	private Date datumErstelltAm;
	private Boolean zipped;
... ```