https://issues.apache.org/bugzilla/show_bug.cgi?id=52761

             Bug #: 52761
           Summary: Sporadic NPE in request.setAttribute()
           Product: Tomcat 7
           Version: 7.0.26
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: regression
          Priority: P2
         Component: Connectors
        AssignedTo: dev@tomcat.apache.org
        ReportedBy: diego.rivera...@gmail.com
    Classification: Unclassified


This is the stack trace.

java.lang.NullPointerException
    at
org.apache.catalina.connector.Request.notifyAttributeAssigned(Request.java:1552)
    at org.apache.catalina.connector.Request.setAttribute(Request.java:1543)
    at
org.apache.catalina.connector.RequestFacade.setAttribute(RequestFacade.java:541)
    at
org.apache.catalina.core.ApplicationHttpRequest.setAttribute(ApplicationHttpRequest.java:281)

Both parameters for the invocation to setAttribute() are non-null.  It works
99% of the time, but sporadically it will cause requests to fail. Looking at
the code, it seems like the request's context is the culprit (value is null).

This problem wasn't showing up with earlier versions (7.0.23, I think).

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