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From Konstantin Kolinko <>
Subject Re: Debugging a Webapp in Eclipse running Tomcat as a stand-alone JVM process
Date Thu, 20 Nov 2014 11:48:18 GMT
2014-11-20 13:56 GMT+03:00 Léa Massiot <>:
> Thank you for your answer.
>> Konstantin Kolinko wrote:
>> Deployment can be done from Ant or from Maven. There exists tools for
>> that.
> Ok, I understand.
>> Konstantin Kolinko wrote:
>> If you are developing your web application, is there a reason why you
>> run Tomcat standalone and not from within Eclipse IDE?
> Here is why.
> On a Unix machine, I start Tomcat as a service, as a non-root user and via
> JSVC. (This is the "as a non-root user" part which is important here for
> me).
> Below is what I tried.
> First test:
> - remove "/etc/init.d/tomcat7" from "/etc/init.d/" and reboot the machine so
> that Tomcat is not automatically started at all (and so that I'm sure no
> other process is using the TCP ports 80 and 443) ;
> - run Eclipse as a non-root user ;
> - add a "local" Tomcat server to the Eclipse workspace ;
> - run a JSP on the server.
> => I get the error message:
> "Several ports (443, 80) required by Tomcat v7.0 Server at localhost are
> already in use. The server may already be running in another process, or a
> system process may be using the port. To start this server you will need to
> stop the other process or change the port number(s)."
> Second test:
> - run Eclipse as root ;
> - run a JSP on the server.
> => There is no error message anymore.
> BUT, I need to run Tomcat as a non-root user. In particular, I need it for
> subsequent operations made via the webapps deployed on the Tomcat server
> (for example: directories and files creations).
> This is the reason why I wanted to "use" the standalone Tomcat that is
> started via the "/etc/init.d/tomcat7" script.
> Usually, on my Windows development machine, I do not have these kind of
> issues.
> This is why I normally and usually use the Tomcat running on the Eclipse
> JVM.
> Does it make any sense?
> I wonder how people developing daily on a Unix machine do to debug their
> webapps in Eclipse as a non-root user.
> Maybe you do? I would totally be glad to know what is the usual practice.

Why do you need the ports to be 80 and 443? (You cannot open those on
Linux unless you are a root).

You can
a) change the port numbers in your configuration
b) use firewall (iptables) to map different local ports to those external ones


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