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I was monitoring my JVM running Apache Tomcat 6, running on Windows, and I noticed that every 3 seconds or so the JVM process (C:\Tomcat\bin\tomcat6.exe) is polling to see whether or not

C:\Tomcatcat\java_pid3748.hprof

exists, where 3748 is the Windows process ID.

I haven't seen write to the hprof file, just test for existence.

(I'm using Sysinternals Process Monitor (procmon.exe) for this monitoring. In procmon the polling shows up as a QueryDirectory operation, which always returns Result "NO SUCH FILE".)

Is this normal, or is this a potential red flag? I gather that these hprof files are generated, perhaps among other times, when you enable the

-XX:+HeapDumpOnOutOfMemoryError

Java flag. I haven't enabled it myself, though I guess it could be enabled somehow in the Tomcat startup scripts.

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hprof files are not just for heap dump. Which is your JVM process command line? (you can check it with Process Explorer).

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