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Subject: Re: Getting application root path before servlet is initialized?
To: Tomcat Users List <users@tomcat.apache.org>
References: <CAJtcoLasrtjDqjmX7Fp3yj2srU_pQYW=SOEyoDs+g_F7hSEVQQ@mail.gmail.com>
From: =?UTF-8?Q?Antonio_S._Cofi=c3=b1o?= <cofinoa@gmail.com>
Message-ID: <160d9d46-39c1-324f-1ba8-17800f2d8501@gmail.com>
Date: Wed, 22 Feb 2017 12:11:56 +0000
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archived-at: Wed, 22 Feb 2017 12:12:08 -0000

Dear Martin,


On 21/02/17 13:31, Martin Knoblauch wrote:
> Hi,
>
>   is there a way to find the absolute path of the application root before
> the servlet is initialized?
>
> Alternatively: is there a way to defer the initialization of a datasource
> until the servlet is initialized?
>
> Background: I have extended "org.apache.tomcat.jdbc.pool.DataSourceFactory"
> to automatically set credentials so that they are not stored in the
> "Catalina/localhost/XXX.xml" file. Instead they are taken from encrypted
> values in a file below the application root. Works fine if I know that path
> at "createDataSource" time.
>
> In order to avoid hard coding that path, I need a programmatic to find that
> value. Unfortunately the datasource is initialized before the servlet, so
> "getRealPath()" is not working yet.
>
> Environment is Tomcat 8 plus JDK 8. Plus an commercial application that I
> do not want to name :-)
>
> Thanks in advance
> Martin
For this purpose I use the ant properties interpolation on tomcat 
configuration xml-files
http://tomcat.apache.org/tomcat-7.0-doc/config/index.html

It may be you requirements needs a more elaborated solution, but this a 
convenient way to do it.

Regards
Antonio


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