Hi,
That piece of code was not changed since 2008 March and the application was
working fine with this code more than half year.
I can't see any suspicious in that class, maybe you can:
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain filterChain) throws IOException, ServletException {
if (isMetadataRequest(request)) {
log.info("Metadata request (wsdl/xsd) received, performing
synchronization.");
synchronized (lock) {
filterChain.doFilter(request, response);
}
} else {
filterChain.doFilter(request, response); // row 54
}
}
private boolean isMetadataRequest(ServletRequest request) {
return request.getParameter("wsdl") != null ||
request.getParameter("WSDL") != null ||
request.getParameter("xsd") != null;
}
Cheers,
Bertalan Kis
-----Original Message-----
From: Caldarale, Charles R [mailto:chuck.caldar...@unisys.com]
Sent: 02 February 2010 12:53
To: Tomcat Users List
Subject: RE: NullPointerException in MimeHeaders
> From: Bertalan Kis [mailto:bertalan....@razorfish.com]
> Subject: RE: NullPointerException in MimeHeaders
>
> com.dnaO2.openspace.client.filter.MetadataRequestSynchFilter.doFilter
> (MetadataRequestSynchFilter.java:54)
The above is the spot you should be looking at, since that's the only stack
entry for your code.
One possible problem is incorrect variable scope, such as using a static or
instance variable in a filter or servlet when you should be using a local one.
Static and instance variables are shared by all requests, so any concurrent
threads using them can trip each other up. The same issue applies to
request-specific information being stored in a session while multiple requests
are being processed.
- Chuck
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