javax.servlet.ServletException: errno: 13 error: Unable to open directory /proc/self/fd about javamelody HOT 7 CLOSED

First, thanks for sharing the information.

Then, an InternalError is supposed to "indicate some unexpected internal error 
has
occurred in the Java Virtual Machine" (catching the InternalError type is not
something we are supposed to do).
And you use IcedTea, which is a jvm I have not tested.

So can it be an issue with IcedTea or Ubuntu ? Do you have the same issue with 
a jdk
from java.sun.com ?
Did you have this issue always/once a day/just once ?
Thanks

[deleted comment]

Hi:

I think I've found the source of the problem:  Karmic Ubuntu uses "jsvc" to 
launch
Tomcat. It starts off as root, but drops down to user tomcat6.

This is mentioned in various bug reports: e.g.
 http://issues.apache.org/jira/browse/DAEMON-120
 http://issues.apache.org/jira/browse/DAEMON-16

In net.bull.javamelody.JavaInformations  is it possible to put a 
try/catch(Throwable)
around the calls to 
com.sun.management.UnixOperatingSystem.getOpenFileDescriptorCount ?

Thanks !

Hi,

This might end up being a non-issue because the next release of Ubuntu (Lucid 
Lynx)
seems to be dropping the use of jsvc.
  See: http://blogs.mulesoft.org/a-better-tomcat-for-ubuntu-and-debian/
However, in the meantime, it would still be nice if the error was caught in the 
code.
Thanks!

Hi all

i have just install javaMelody (the last version) with sun jdk on debian OS and 
i
encountered the same issue each time.

Jonathan

If I understand, it is an issue of the current tomcat package on ubuntu and 
debian
when using jsvc:
http://issues.apache.org/jira/browse/DAEMON-120
http://blogs.mulesoft.org/a-better-tomcat-for-ubuntu-and-debian/

However due the number of users which will possibly use this package, I have 
made a
workaround: file descriptors count will not be displayed in this case. The fix 
is
available in the trunk of svn and ready for next release (1.14).
Note that I am not able to test it on ubuntu or debian with jsvc.

Issue 17 has been merged into this issue.