Tomcat - GRAVE: Excepción cargando sesiones desde almacenamiento persistente

Hola a todos, estoy teniendo este error. En un post observé que indicaban que faltaba la serialización pero lo hice y me provocó mas errores. Favor si alguien puede sugerir alguna solución.

INFORMACIÓN: Running on PrimeFaces Extensions 1.2.1
sep 30, 2015 10:17:30 AM org.apache.catalina.session.StandardManager doLoad
GRAVE: IOException al cargar sesiones persistidas: java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: ec.edu.epn.controlador.seguridades.UsuarioDataManager
java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: ec.edu.epn.controlador.seguridades.UsuarioDataManager
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
at java.io.ObjectInputStream.readSerialData(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at org.apache.catalina.session.StandardSession.readObject(StandardSession.java:1619)
at org.apache.catalina.session.StandardSession.readObjectData(StandardSession.java:1084)
at org.apache.catalina.session.StandardManager.doLoad(StandardManager.java:282)
at org.apache.catalina.session.StandardManager.load(StandardManager.java:202)
at org.apache.catalina.session.StandardManager.startInternal(StandardManager.java:489)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5540)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.StandardContext.reload(StandardContext.java:4034)
at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:425)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1344)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1545)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1555)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1555)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1523)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.NotSerializableException: ec.edu.epn.controlador.seguridades.UsuarioDataManager
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at org.apache.catalina.session.StandardSession.writeObject(StandardSession.java:1695)
at org.apache.catalina.session.StandardSession.writeObjectData(StandardSession.java:1101)
at org.apache.catalina.session.StandardManager.doUnload(StandardManager.java:430)
at org.apache.catalina.session.StandardManager.unload(StandardManager.java:351)
at org.apache.catalina.session.StandardManager.stopInternal(StandardManager.java:516)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5722)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
at org.apache.catalina.core.StandardContext.reload(StandardContext.java:4027)
... 7 more

sep 30, 2015 10:17:30 AM org.apache.catalina.session.StandardManager startInternal
GRAVE: Excepción cargando sesiones desde almacenamiento persistente
java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: ec.edu.epn.controlador.seguridades.UsuarioDataManager
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
at java.io.ObjectInputStream.readSerialData(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at org.apache.catalina.session.StandardSession.readObject(StandardSession.java:1619)
at org.apache.catalina.session.StandardSession.readObjectData(StandardSession.java:1084)
at org.apache.catalina.session.StandardManager.doLoad(StandardManager.java:282)
at org.apache.catalina.session.StandardManager.load(StandardManager.java:202)
at org.apache.catalina.session.StandardManager.startInternal(StandardManager.java:489)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5540)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.StandardContext.reload(StandardContext.java:4034)
at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:425)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1344)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1545)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1555)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1555)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1523)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.NotSerializableException: ec.edu.epn.controlador.seguridades.UsuarioDataManager
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at org.apache.catalina.session.StandardSession.writeObject(StandardSession.java:1695)
at org.apache.catalina.session.StandardSession.writeObjectData(StandardSession.java:1101)
at org.apache.catalina.session.StandardManager.doUnload(StandardManager.java:430)
at org.apache.catalina.session.StandardManager.unload(StandardManager.java:351)
at org.apache.catalina.session.StandardManager.stopInternal(StandardManager.java:516)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5722)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
at org.apache.catalina.core.StandardContext.reload(StandardContext.java:4027)
... 7 more