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From: Apache Wiki <wikidiffs@apache.org>
To: Apache Wiki <wikidiffs@apache.org>
Date: Sat, 02 Feb 2013 22:42:43 -0000
Message-ID: <20130202224243.76912.86937@eos.apache.org>
Subject: 
 =?utf-8?q?=5BTomcat_Wiki=5D_Update_of_=22HowTo=22_by_KonstantinKolinko?=
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The "HowTo" page has been changed by KonstantinKolinko:
http://wiki.apache.org/tomcat/HowTo?action=3Ddiff&rev1=3D127&rev2=3D128

Comment:
Add a warning. There should be a better recipe somewhere in the mailing lis=
t archives.

  Context context =3D (Context) host.findChild("myContext");
  Realm realm =3D context.getRealm();
  }}}
+ =

+ '''Warning:''' The above recipe on how to obtain a `Context` for a web ap=
plication is a bit obsolete and does not work in Tomcat 7 and later (as Ser=
ver is no longer a singleton). There are other ways to achieve that. An eas=
y one is to add a `Valve` or `Listener` to a context, as those classes have=
 access to Tomcat internals. There may be other ways mentioned in the archi=
ves of the [[FAQ/Tomcat_User|users mailing list]].
+ =

  =3D=3D How do I redirect System.out and System.err to my web page? =3D=3D
  I have met a situation where I needed to redirect a portion of standard o=
uput (`System.out`, STDOUT) and standard error (`System.err`, STDERR) to my=
 web page instead of a log file. An example of such an application is a com=
piler research platform that our resarch team is putting online for anybody=
 to be able to quickly compile-test their programs on line. Naturally, the =
compilers dump some of their stuff to STDERR or STDOUT and they are not web=
 application `.jar`. Thus, I needed badly these streams related to the comp=
iler output to be redirected to my web editor interface. Having found no ea=
sy instructions on how to do that lead me writing up this quick HOWTO. The =
HOWTO is based on Servlets, but similar arrangements can be done for JSPs. =
The below example shows the essentials, with most non-essentials removed.
 =20

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