Endeca InvokeAssembler:Assembler Exception:---java.lang.NullPointerException and also Jboss log file fills in GB with StackOverflowError message

Problem Statement:

Endeca InvokeAssembler:Assembler Exception:---java.lang.NullPointerException is thrown and also Jboss Log is filling in GB in few minutes to Hour with below exception:

2015-07-09 03:46:06,987 ERROR [nucleusNamespace.atg.endeca.InvokeAssembler] (ajp-0.0.0.0-10109-20) InvokeAssembler.service():Assembler Excepti on:---java.lang.NullPointerException 2015-07-09 2015-07-09 03:46:07,664 FATAL [org.apache.jasper.runtime.JspFactoryImpl] (ajp-0.0.0.0-10109-24) Exception initializing page context java.lang.StackOverflowError

       at org.apache.catalina.core.ApplicationHttpRequest.getSession(ApplicationHttpRequest.java:544)
       at javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:216)
       at org.apache.catalina.core.ApplicationHttpRequest.getSession(ApplicationHttpRequest.java:544)
       at javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:216)
       at org.apache.catalina.core.ApplicationHttpRequest.getSession(ApplicationHttpRequest.java:544)
       at javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:216)
       at org.apache.catalina.core.ApplicationHttpRequest.getSession(ApplicationHttpRequest.java:544)
       at javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:216)
       at org.apache.catalina.core.ApplicationHttpRequest.getSession(ApplicationHttpRequest.java:544)
       at javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:216)
       at org.apache.catalina.core.ApplicationHttpRequest.getSession(ApplicationHttpRequest.java:544)
       at javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:216)
       at org.apache.catalina.core.ApplicationHttpRequest.getSession(ApplicationHttpRequest.java:544)

Solution:
If there is no default page defined you will get above exceptions.

Assembler checks for trigger condition(s), priority, segmentation, time-boxing etc..  Make sure default page does not have expired time box or segmentation.

For example : Home page will be created for each day with time boxed. Merchandiser will create home page versions for 1 week with time boxing. If there is no valid page with expired time-box then assembler never finds default Home page and throws errors in JBOSS log.

How to check time boxing on page:

Go to Endeca XM page and check for below highlighted spot.






How to Remove time box? 

Uncheck the time and make one of the page default.


FYI
XM Promote page script run is required to reflect any changes done on site.