Hello,
with Tomcat 8.0.32 (and 8.0.28) sometimes the response object is already
committed, before the servlet or JSP page is doing anything.
I am moving a large legacy application from Tomcat 6 to Tomcat 8 and
found, that JSP pages were sometimes returned to the browser without
any HTTP header or HTTP status line.
So I wrote a servlet filter for debugging:
public class JSPDebugFilter implements Filter {
public void doFilter(ServletRequest req, ServletResponse resp,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest httpReq = (HttpServletRequest) req;
HttpServletResponse httpResp = (HttpServletResponse) resp;
System.err.println("JSP Debug filter committed " +
resp.isCommitted() + " " + httpReq.getRequestURI());
if (resp.isCommitted()) {
System.err.println(httpResp);
(new Throwable("")).printStackTrace();
}
chain.doFilter(req, resp);
}
...
}
It shows, that the response is already committed, when this error happens:
JSP Debug filter committed true /myapp/rsetup.jsp
org.apache.catalina.connector.ResponseFacade@a7c4e6b
java.lang.Throwable:
at
simbiosys.chemplanner.servlet.JSPDebugFilter.doFilter(JSPDebugFilter.java:30)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
The problem happens with both HTTP connector and AJP connector. But if
I switched from
Connector protocol="HTTP/1.1" to org.apache.coyote.http11.Http11Protocol ,
it looked like the error was gone. Same for AJP.
But when we did a load test (unfortunately without the filter),
something similar happened in rare cases (about 1 out of 1000):
06-Apr-2016 06:28:00.386 SEVERE [ajp-bio-9019-exec-68]
org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service()
for servlet [suppliers] in context with path [/myapp] threw exception
java.lang.IllegalStateException: Cannot create a session after the
response has been committed
at
org.apache.catalina.connector.Request.doGetSession(Request.java:2928)
The session is started at the beginning of the method, before anything
else is done.
Could the bug be caused by my application or is this a Tomcat bug? Where
could I start debugging?
Thanks
Martin
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