apache tomcat 5.5.25 stops working after sometime

[ramesh agarwal]

i am using a struts application. Apache talks to tomcat uisng mod_jk everything works fine and after sometime nothing happens and requests return nothing. I see the follwing from logs:

org.apache.catalina.core.ApplicationHttpRequest@6c2a78 becomes null.

i also see

SEVERE: Exception Processing ErrorPage[errorCode=500, location=/500error.jsp]
java.lang.IllegalStateException
at org.apache.coyote.Response.reset(Response.java:297)
at org.apache.catalina.connector.Response.reset(Response.java:653)
at org.apache.catalina.connector.Response.reset(Resp

Is there any known struts 1.x + tomcat 5.5.25 + apache issue here?