The Resin console constantly shows this when running Jenkins as users
navigate the site:
14-05-01 11:58:46.753] {Handling GET /jenkins/ : resin-port-8080-23} Caught
exception evaluating: h.advertiseHeaders(response) in /jenkins/. Reason:
java.lang.NullPointerException
java.lang.NullPointerException
at
com.caucho.server.http.AbstractHttpResponse.setHeader(AbstractHttpResponse.java:359)
at
com.caucho.server.http.HttpServletResponseImpl.setHeader(HttpServletResponseImpl.java:1174)
at
javax.servlet.http.HttpServletResponseWrapper.setHeader(HttpServletResponseWrapper.java:121)
I asked in the Resin Google group and there is a fix, wondered if there is
a smarter way to deal with this or if a future Jenkins version might
correct it? Thanks:
(Snip)
The other thing I found is something which again is easy to test but makes
me question your comment about a Jenkins misconfig.. If you just drop the
jenkins,war (http://jenkins-ci.org/) into resins /webapps folder, then
visit http://localhost:8080/jenkins or whatever, the exception is thrown
right away before any config is attempted, then again each time you
navigatre pages on the site. Seems odd you get this right from the get go
and only under resin … ?
OK I debugged it further and have a workaround.
The NPE is thrown in Resin because hudson.Functions is trying to set the
header "X-Jenkins-CLI-Host” to a value it gets from
System.getProperty(TcpSlaveAgentListener.class.getName()+".hostName”).
For both Resin and Jenkins standalone mode, this value is null. In
standalone mode the header does not even show up to the browser.
Standalone mode appears to be running with Jetty, so the difference then
is Resin vs Jetty handling of null values for setHeader. I have to assume
Jetty silently ignores the null header set attempt, while Resin throws a
NPE. I also have to assume our handling for this case is correct since
Resin has passed Oracle TCK testing. However I didn’t actually lookup this
test case to verify which behavior is expected.
In any case, if you set the “hudson.TcpSlaveAgentListener.hostName" system
property in Resin the exception will go away.
I added this to resin.properties:
jvm_args : -Xmx2048m -XX:MaxPermSize=256m
-Dhudson.TcpSlaveAgentListener.hostName=127.0.0.1
Thanks,
Paul
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