Getting java.io.StreamCorruptedException: invalid type code: nn

Issue

• We got a following error intermittently.

2014-07-07 23:18:09,802 ERROR [org.jboss.seam.exception.Exceptions] (ajp-0.0.0.0-8009-1) handled and logged exception
java.io.StreamCorruptedException: invalid type code: 12
    at java.io.ObjectInputStream$BlockDataInputStream.readBlockHeader(ObjectInputStream.java:2463)
    at java.io.ObjectInputStream$BlockDataInputStream.refill(ObjectInputStream.java:2498)
    at java.io.ObjectInputStream$BlockDataInputStream.skipBlockData(ObjectInputStream.java:2400)
    at java.io.ObjectInputStream.skipCustomData(ObjectInputStream.java:1896)
    at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1804)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1750)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
    at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1666)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1322)
....
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1322)
    at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1666)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1322)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
    at com.sun.faces.renderkit.ResponseStateManagerImpl.getTreeStructureToRestore(ResponseStateManagerImpl.java:200)
    at javax.faces.render.ResponseStateManager.getState(ResponseStateManager.java:226)
    at org.ajax4jsf.application.AjaxStateManager.restoreView(AjaxStateManager.java:436)
    at com.sun.faces.application.ViewHandlerImpl.restoreView(ViewHandlerImpl.java:311)
    at org.jboss.seam.jsf.SeamViewHandler.restoreView(SeamViewHandler.java:93)
    at com.sun.facelets.FaceletViewHandler.restoreView(FaceletViewHandler.java:318)
    at org.ajax4jsf.application.ViewHandlerWrapper.restoreView(ViewHandlerWrapper.java:107)
    at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:179)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
    at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:102)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
    at org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:40)
    at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
    at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90)
    at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
    at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
    at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
    at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
    at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
    at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)
    at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
    at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
    at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
    at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:56)
    at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
    at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:60)
    at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
...

• It occurs 0 to 4 times per day.