interpolator.addValueSource( new PropertiesBasedValueSource( request.getSystemProperties() ) );
try
{
interpolator.addValueSource( new EnvarBasedValueSource() );
}
catch ( IOException e )
{
problems.add( new DefaultSettingsProblem( "Failed to use environment variables for interpolation: "
+ e.getMessage(), SettingsProblem.Severity.WARNING, "", -1, -1, e ) );