Getting ClassNotFoundException after upgrading from 1.1.3 to 1.1.4/1.1.5

[shashank929]

Hello,

I am trying to use hazelcast-tomcat7-sessionmanager in client-server mode by connecting to hazelcast cluster which is running enterprise version 3.12. I am able to get it running except for a few use-cases where I saw errors related to :

Mar 07, 2021 11:48:27 PM com.hazelcast.session.HazelcastSessionManager findSession
INFO: No Session found for:35003B2FF6F8DDE5374B4A95597DDF08.localhost_abc

Since it looks related to #61 , I thought of upgrding from 1.1.13 to 1.1.14 but when I did that I am running into another basic issue where it is giving ClassNotFoundException for most of the classes:

Mar 07, 2021 11:55:01 PM com.hazelcast.session.HazelcastSession deserializeMap
WARNING: Unable to deserialize object in session
com.hazelcast.nio.serialization.HazelcastSerializationException: java.lang.ClassNotFoundException: com.tester.abc.dto.user.UserInfo
at com.hazelcast.internal.serialization.impl.JavaDefaultSerializers$JavaSerializer.read(JavaDefaultSerializers.java:88)
at com.hazelcast.internal.serialization.impl.JavaDefaultSerializers$JavaSerializer.read(JavaDefaultSerializers.java:77)
at com.hazelcast.internal.serialization.impl.StreamSerializerAdapter.read(StreamSerializerAdapter.java:48)
at com.hazelcast.internal.serialization.impl.AbstractSerializationService.readObject(AbstractSerializationService.java:269)
at com.hazelcast.internal.serialization.impl.ByteArrayObjectDataInput.readObject(ByteArrayObjectDataInput.java:574)
at com.hazelcast.session.HazelcastSession.deserializeMap(HazelcastSession.java:171)
at com.hazelcast.session.HazelcastSession.readData(HazelcastSession.java:156)
at com.hazelcast.internal.serialization.impl.DataSerializableSerializer.readInternal(DataSerializableSerializer.java:160)
at com.hazelcast.internal.serialization.impl.DataSerializableSerializer.read(DataSerializableSerializer.java:106)
at com.hazelcast.internal.serialization.impl.DataSerializableSerializer.read(DataSerializableSerializer.java:51)
at com.hazelcast.internal.serialization.impl.StreamSerializerAdapter.read(StreamSerializerAdapter.java:48)
at com.hazelcast.internal.serialization.impl.AbstractSerializationService.toObject(AbstractSerializationService.java:187)
at com.hazelcast.client.spi.ClientProxy.toObject(ClientProxy.java:102)
at com.hazelcast.client.proxy.ClientMapProxy.getAll(ClientMapProxy.java:1196)
at com.hazelcast.session.HazelcastSessionManager.findSessions(HazelcastSessionManager.java:241)
at org.apache.catalina.session.ManagerBase.processExpires(ManagerBase.java:655)
at org.apache.catalina.session.ManagerBase.backgroundProcess(ManagerBase.java:646)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1348)
at org.apache.catalina.core.StandardContext.backgroundProcess(StandardContext.java:5958)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1542)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1552)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1552)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1520)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassNotFoundException: com.tester.abc.dto.user.UserInfo
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1892)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1735)
at com.hazelcast.nio.ClassLoaderUtil.tryLoadClass(ClassLoaderUtil.java:288)
at com.hazelcast.nio.ClassLoaderUtil.loadClass(ClassLoaderUtil.java:252)
at com.hazelcast.nio.IOUtil$ClassLoaderAwareObjectInputStream.resolveClass(IOUtil.java:699)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1924)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1807)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2098)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1624)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:464)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:422)
at com.hazelcast.internal.serialization.impl.JavaDefaultSerializers$JavaSerializer.read(JavaDefaultSerializers.java:84)
... 23 more

It was working fine till 1.1.13 so definitely looks something related to #56 , #55 which were merged into 1.1.14

Can you please suggest what exactly might've caused it and what can be done to fix it?

[alparslanavci]

Hi @shashank929, could you please share a reproducer with us? That would help us to investigate the issue easier.

[shashank929]

Hi @alparslanavci ,

I am able to reproduce this issue by downloading tomcat from this link and then using a custom class to populate the record. The record gets populated fine but the above mentioned error is seen for every class whose object is in the record and that class being in the webapp/lib path.
I modified the SessionExample.java which comes along with the tomcat as a sample in /webapps/examples/WEB-INF/classes directory. Please place your own class in the same directory and use it for populating the record.
Once you populate the record then within few mins/seconds you'll be able to see the error stacktrace in logs. with 1.14 and 1.1.5 i am able to see the error but not with 1.1.3.
can it be something related to #58 ?

Thanks,
Shashank