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From: "Bergquist, Brett" <BBergquist@canoga.com>
To: "derby-dev@db.apache.org" <derby-dev@db.apache.org>
Date: Tue, 10 Sep 2013 17:43:28 -0700
Subject: Re: Is there some way an external class can find where
 derby.system.home points to
Thread-Topic: Is there some way an external class can find where
 derby.system.home points to
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Message-ID: <BB479B78-4DB1-418A-9003-FE7B3E263E22@canoga.com>
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I will open a JIRA for this Kathy and then try to get a patch together.  I =
agree this should be part of the core of Derby as it really is needed to ma=
ke Derby a self maintaining system especially when being run in Network Ser=
ver mode.

On Sep 6, 2013, at 4:59 PM, Katherine Marsden <kmarsdenderby@sbcglobal.net>=
 wrote:

> On 9/6/2013 5:35 AM, Bergquist, Brett wrote:
>> I finally broke down and wrote RollingFileStream which provides (and bor=
rows) most of the functionality of java.logger.FileHandler to provide a rol=
ling file stream.   Having derby.log grow forever on long running systems i=
s just not acceptable anymore ;)   Realistically, I would like to provide t=
his back to the derby community somehow as I found many requests for such a=
 feature while searching and many references to using "derby.stream.error.m=
ethod" or "derby.stream.error.field", but no good implementation of such.
>>=20
>> I built a DerbyUtil.jar which the class along with a configurator class =
which can read a "derbylog.properties" file for configuration information. =
  I would like to locate this file at the same place as "derby.properties" =
so the configurator needs to find out what "derby.system.home" is set to.  =
 Because of the default security policy installed by the network server and=
 because my DerbyUtil.jar is separate, it cannot access the property.   Cre=
ate and installing my own security policy is also a bit of a pain as the ne=
twork server is started by Glassfish and there really is not much opportuni=
ty to pass startup parameters.
>>=20
>> So is there someway to locate the location that  "derby.ssystem.home" is=
 pointing to in my class that is being invoke by "derby.stream.error.field"=
?
> You can read the system property derby.system.home and if not set use=20
> the property user.dir. That said, I think it would be good to=20
> incorporate this functionality into the core product and then the=20
> properties could go into derby.properties.  It seems to me there was a=20
> Jira issue for this, but I can't find it right now.
>>=20
>> How about a proposal that "derby.stream.error.field" can point to a stat=
ic method that can take 0 or 1 parameters and if one parameter, it is passe=
d the value of "derby.system.home" as a String.  This seems to be a simple =
change and could easily be accommodated by first using reflection to find t=
he method that takes 0 parameters and if not found, retry with finding the =
method that takes one string parameter?
>>=20
>> Brett
>>=20
>=20
>=20