Unable to deserialize object of type: java.util.concurrent.ConcurrentHashMap

[Preeti]

Hello,

   I am getting below exception. Can anyone help me in this..

WARNING: Could not load session with id 7A344970D8FA918FF097EF1292514E99-n1 from memcached.
com.esotericsoftware.kryo.SerializationException: Unable to deserialize object of type: java.util.concurrent.ConcurrentHashMap
        at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:593)
        at com.esotericsoftware.kryo.ObjectBuffer.readObject(ObjectBuffer.java:213)
        at de.javakaffee.web.msm.serializer.kryo.KryoTranscoder.deserializeAttributes(KryoTranscoder.java:256)
        at de.javakaffee.web.msm.TranscoderService.deserializeAttributes(TranscoderService.java:159)
        at de.javakaffee.web.msm.TranscoderService.deserialize(TranscoderService.java:116)
        at de.javakaffee.web.msm.MemcachedSessionService.loadFromMemcached(MemcachedSessionService.java:1017)
        at de.javakaffee.web.msm.MemcachedSessionService.findSession(MemcachedSessionService.java:568)
        at de.javakaffee.web.msm.MemcachedBackupSessionManager.findSession(MemcachedBackupSessionManager.java:228)
        at org.apache.catalina.connector.Request.doGetSession(Request.java:2419)
        at org.apache.catalina.connector.Request.getSession(Request.java:2157)
        at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:833)
        at org.apache.catalina.filters.CsrfPreventionFilter.doFilter(CsrfPreventionFilter.java:157)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at de.javakaffee.web.msm.SessionTrackerValve.invoke(SessionTrackerValve.java:126)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:563)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
        at java.lang.Thread.run(Thread.java:679)
Caused by: com.esotericsoftware.kryo.SerializationException: Unable to deserialize object of type: org.apache.catalina.filters.CsrfPreventionFilter$LruCache
        at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:571)
        at com.esotericsoftware.kryo.serialize.MapSerializer.readObjectData(MapSerializer.java:129)
        at com.esotericsoftware.kryo.Serializer.readObject(Serializer.java:61)
        at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:589)
        ... 25 more
Caused by: com.esotericsoftware.kryo.SerializationException: Serialization trace:
cache (org.apache.catalina.filters.CsrfPreventionFilter$LruCache)
        at com.esotericsoftware.kryo.serialize.FieldSerializer.readObjectData(FieldSerializer.java:238)
        at com.esotericsoftware.kryo.serialize.ReferenceFieldSerializer.readObjectData(ReferenceFieldSerializer.java:81)
        at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:566)
        ... 28 more
Caused by: java.lang.NullPointerException
        at java.util.HashMap.put(HashMap.java:390)
        at com.esotericsoftware.kryo.serialize.MapSerializer.readObjectData(MapSerializer.java:130)
        at com.esotericsoftware.kryo.serialize.FieldSerializer.readObjectData(FieldSerializer.java:220)
        ... 30 more

[Martin Grotzke]

It seems as if the implementation of the CsrfPreventionFilter.LruCache
is the issue, particularly the cache field (anonymous inner class).

You could try to write a custom kryo serializer for this class, but I
doubt that it's possible to recreate/deserialize an LruCache instance
with the same properties/the same behaviour (as the cacheSize will not
be accessible).

Alternatively you could try to use java serialization and see if this works.

Of course you might also switch off the CsrfPreventionFilter, not sure
if this is an option.

Cheers,
Martin

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[Pawan Goyal]

I am also getting the same exception .I have changed the SerializationStrategies. to  de.javakaffee.web.msm.JavaSerializationTranscoderFactory.

Now its working fine.

[Martin Grotzke]

Good to know. If you're interested (or anyone else) in having kryo
support this please submit an issue or pull request.

Cheers,
Martin

On 09/25/2015 08:48 AM, Pawan Goyal wrote:
> I am also getting the same exception .I have changed
> the SerializationStrategies

> <https://code.google.com/p/memcached-session-manager/wiki/SerializationStrategies>.

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