I've never had this problem before, but now I'm getting this:
in resource-usage there was this exception: #<NullPointerException
java.lang.NullPointerException>
at startup, for this function:
(defn- resource-usage []
(let [my-pool (at/mk-pool)]
(at/every 60000
(fn []
(try
(timbre/log :trace "Resource usage: "
(monitoring/show-stats-regarding-resources-used-by-this-app))
(doseq [x (monitoring/thread-top)]
(timbre/log :trace x))
(catch Exception e (println "in resource-usage there was
this exception: " e))))
my-pool)))
This line:
(timbre/log :trace "Resource usage: "
(monitoring/show-stats-regarding-resources-used-by-this-app))
Correctly gives me:
Resource usage: Memory in use (percentage/used/max-heap): ("9%" "43M"
"444M")
So the problem comes here:
(doseq [x (monitoring/thread-top)]
(timbre/log :trace x))
Which relies on java.lang.management.ManagementFactory
(defn thread-top
"Return a seq of threads sorted by their total userland CPU usage."
[]
(let [mgr (ManagementFactory/getThreadMXBean)
cpu-times (map (fn [t]
[(.getThreadCpuTime mgr (.getId t)) t])
(threads))]
(map
(fn [[cpu t]] [cpu (.getName t) (.getId t) t])
(reverse (sort-by first cpu-times)))))
With some code borrowed from here:
http://lifeisagraph.com/2011/04/24/debugging-clojure.html
Does anyone see a place where a NullPointerException might get started?
I assume this must be some circumstance unique to startup. I don't think
this problem repeats.
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