need help with Shibboleth IDP 3.0 installation

[Tom Zeller]

> I installed IDP 3.0 on Linux Redhat 6. When I started tomcat, I got this
> error in catalina.out. During IDP installation, I gave
> /app/shibboleth/shibboleth-idp as installation path and idp.properties file
> is in /app/shibboleth/shibboleth-idp/conf directory after installation. What
> I missed?
>
> 2015-01-12 11:23:58.445 [ WARN] :
> net.shibboleth.idp.spring.IdPPropertiesApplicationContextInitializer: Unable
> to find '/conf/idp.properties' at well known locations
> '[/opt/shibboleth-idp]'

Either set idp.home as a system property or make a symlink to
/opt/shibboleth-idp.

See

 If you chose to install to a location other than the default
(/opt/shibboleth-idp) :
  -Didp.home=<location> (replacing <location> with your install location)

on

 https://wiki.shibboleth.net/confluence/display/IDP30/ApacheTomcat8