Servlet returning blank page and then re-initing every 5 minutes

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Servlet returning blank page and then re-initing every 5 minutes

Servlet returning blank page and then re-initing every 5 minutes

2004-01-12 - By Allistair Crossley

Back

Reply: 1 2 3 4 5 6 7

I am not sure if this is a Tomcat or Struts or code problem...

Every now and again (every 5 minutes or so) my requests to Tomcat are coming
back with a blank white page.

The logs show the following stack trace where myController is an ActionServlet
...

Servlet.service() for servlet myController threw exception
java.lang.NullPointerException

Source code of java.lang.NullPointerException

at org.apache.struts.action.RequestProcessor

Source code of org.apache.struts.action.RequestProcessor

(RequestProcessor.java:1136)
at org.apache.struts.tiles.TilesRequestProcessor

Source code of org.apache.struts.tiles.TilesRequestProcessor

(TilesRequestProcessor.java:180)
at org.apache.struts.tiles.TilesRequestProcessor

(TilesRequestProcessor.java:309)
at org.apache.struts.action.RequestProcessor

(RequestProcessor.java:279)
at org.apache.struts.action.ActionServlet

Source code of org.apache.struts.action.ActionServlet

(ActionServlet.java:1482)
at org.apache.struts.action.ActionServlet

(ActionServlet.java:507)
at javax.servlet.http.HttpServlet

Source code of javax.servlet.http.HttpServlet

(HttpServlet.java:743)
at javax.servlet.http.HttpServlet

(HttpServlet.java:856)

About 2 subsequent requests are also blank but around the 3rd attempt works and
I notice in our own logs that the myController servlet has been reinitialised
with the init() method.

Does anyone know what could be going on here? Why is the servlet going down and
then having to be revived by subsequent requests to it?

Cheers ADC

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